“makes a measurement” function pack design guide...

“Makes a Measurement” Function Pack Design GuideDevices for use with Sensors

Analog and Interface Product Solutions

Operational AmplifiersMCP602, MCP606/7/8/9,MCP607, MCP617, MCP619, MCP6022, MCP6024, MCP6042,TC7650/7652, TC913A/B

ComparatorsMCP6541

Programmable Gain AmplifierMCP6S2x family (MCP6S21,MCP6S22, MCP6S26, MCP6S28)

Analog-to-Digital ConvertersMCP3002, MCP3301

Temperature SensorsTC1047A

Design ideas in this guide are based on many of the devices featured in Microchip Technology's “Makes a Measurement” FunctionPack. A complete device list and corresponding data sheets for these products can be found at www.microchip.com/funpack

Design ideas in this guide use the following devices. Devices in BOLD type are also included in the “funpack”:Voltage ReferencesMCP1525, MCP1541

Digital PotentiometersMCP42010 MCP42050 MCP42100

This guide is a companion to the “Makes a Measurement” functional sample pack (“funpack”). Contact your local Microchipsales person for additional information.

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Devices for use with Sensors

Product Overviews

Operational AmplifiersMicrochip Technology offers a broad portfolio of OperationalAmplifiers (Op Amps), Comparators and Integrated OpAmp/Comparators. The Op Amp families include devicesthat operate with IQ as low as 0.6 µA and others with GainBandwidth Product (GBWP) up to 10 MHz. These Op Ampfamilies offer some of the lowest IQ for a given GBWP inthe industry.

Additionally, all of Microchip’s Op Amps operate on a sin-gle supply up to 5.5V, and depending on the family, as lowas 1.4V. All Microchip Op Amps offer rail-to-rail output withmost also offering rail-to-rail input. Some of the familieshave been designed to minimize VOS resulting in offsetsas low as 5 µV.

This design guide includes Op Amps from the following product families: the MCP60x, MCP61x, MCP602x,MCP604x, MCP62xx, MCP765x, TC913A/B and TC10xx.These families offer single, dual or quad amplifiers in space-saving packages with low operating currents, andadvanced CMOS technology.

Measurement Overview

Programmable Gain Amplifier (PGA) with Built-in Analog Multiplexer The MCP6S21, MCP6S22, MCP6S26 and MCP6S28Programmable Gain Amplifiers offer 1, 2, 6 or 8 inputchannels respectively and eight steps of gain. Thesedevices are programmable over an SPI™ bus and thus addgain control and input channel selection to the embeddedcontrol system. This is all achieved in one simple integrationthat allows for considerable greater bandwidth at a lowsupply current.

These amplifiers weredesigned with the embeddedcontrol system in mind. Thetypical complexity of multiplesensor systems is reducedto one amplifier that themicrocontroller (MCU) orprocessor can control. Thisreduces the demand on theI/O of the MCU and allowscontrol over the level of gain.One superior amplifier can be used to perform the functions of multiple amplifiers at a lower costand with less space.

Voltage ReferencesMicrochip offers the MCP15xx family of low power and lowdropout precision Voltage References. The family includesthe MCP1525 with an output voltage of 2.5V and theMCP1541 with an output voltage of 4.096V. Microchip’s voltagereferences are offered in SOT23-3 and TO-92 packages.

Digital Potentiometers (SPI™ Controlled)The MCP41xxx and MCP42xxx family of digital potentiometerscombine high performance and low power consumption in asmall package, making them ideal for embedded controlapplications.

Analog-to-Digital Converters (ADC)Microchip offers a broad portfolio of high-precision SAR,Sigma-Delta and Dual Slope A/D Converters. The MCP300x(10-bit), MCP320x (12-bit) and MCP330x (13-bit) SAR ADCscombine high performance and low power consumption in asmall package, making them ideal for embedded controlapplications. The TC34xx Sigma Delta ADCs are optimizedfor use with a microcontroller in low cost, battery-operatedsystems. The TC5xx Dual Slope ADC devices offer anotheralternative with up to 17-bits of conversion resolution.

Microchip Technology has integrated analog technology, peripherals and features to meet today's demanding measurementdesign requirements. Microchip’s extensive analog portfolio includes operational amplifiers and programmable gain amplifiers,voltage references, digital potentiometers, analog-to-digital converters, and silicon IC temperature sensors. These innovativeproducts are combined with time saving application notes and design software to ease the integration of these products intoyour sensing systems.

Sensors and Applicationsn Thermocouples for stoves, engines and process

controln Wheatstone Bridge Pressure Sensors for automotive

and industrial controln Strain gauges for enginesn Low side current monitors for motors and batteries


Devices for both Local and Remote Sensing Applications

Microchip has a wide variety of Op Amps to meet yoursensing requirements for both remote and local sensingapplications.

The definition of a remote or local sensor is arbitrary and in high noise environments all sensors should be

Sensors and Applicationsn Thermistors for battery chargers and power supply

over temperature protectionn Humidity Sensors for process controln Pyroelectric infrared intrusion alarms, motion

detection and garage door openersn Smoke and fire sensors for home and officen Charge amplifier for Piezoelectric transducers

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Remote Sensing

Local Sensing

Key Amplifier Specificationsn Differential Inputn Large CMRRn Small VOSMicrochip products:n MCP616/7/8/9n TC913A/Bn TC7650/7652

considered as remote sensors. A good design rule is toconsider any sensor that is not located on the same PCBas the signal conditioning circuitry as a “remote” sensor.Remote sensing applications typically use a differentialamplifier or an instrumentation amplifier, while localsensing can use a non-inverting or inverting amplifier.

Key Amplifier Specifications

n Single-ended Input

n Rail-to-Rail Input/Output

n Amplifier Gain Bandwidth Product

Microchip products:

n MCP6001/2/4 n MCP6271/2/3/4

n MCP601/2/3/4 n MCP6281/2/3/4

n MCP6021/2/3/4 n MCP6291/2/3/4

n MCP6041/2/3/4 n MCP6141/2/3/4

n MCP606/7/8/9 n MCP6S21/2/6/8

n Pressure Sensorsn Strain Gauges

Temperature Intolerant Gain Amplifier

Amplifier Selection Criterian Rail-to-Rail Input / Output Swing n Industrial Temperature Controln Precision Instrumentation

Applicationsn Thermistor for battery chargers and home thermostats

LVDT position and rotation sensors for industrial controln Hall effect sensors for engine speed sensing and door

openersn Photoelectric infrared detectorn Photoelectric motion detectors, flame detectors,

intrusion alarms


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Input MUXn 1, 2, 6, and 8 Channel Versionsn Low Bias Currentn Low Input Capacitance

Amplifier

n High performancen Constant BW (~ 2 to 12 MHz)n Gain Accuracy < ±1%n Input Offset Voltage < ±150 µV

Applications

n Multiple local sensor applicationsn Thermopiles which require a thermocouple and

thermistor interface circuitn Dew point sensors that require a humidity and

temperature measurement

MCP6S21/2/6/8 Programmable Gain Amplifier Features:n SPI bus Programmable Gain Amplifiers n Built-in analog Multiplexern 1, 2, 6 or 8 input channels, and eight steps of gainn Since these devices are programmable over an

SPI bus, they add gain control and input channelselection to the embedded control system in onesimple integration that allows for considerablygreater bandwidth at a low supply current.

Amplifier: Example Designs for use with Local Sensors

New Product - Programmable Gain Amplifier

Product specifications can be found on page 10

MCP42010MCP42050MCP42100

MCP6021/2/3/4 Operational Amplifier Features:n Rail-to-Rail Input/Output, GBWP 10 MHz (typical)n Low Noise: 8.7 nV/rtHz, at 10 kHz (typical)n Low Offset Voltage: 500 µV (max.), at 25°CMCP6041/2/3/4 Operational Amplifier Features:n Low Quiescent Current: 600 nA/Amplifier (typical)n Rail-to-Rail Input: -0.3V to VDD+0.3V (max.)n Rail-to-Rail Output: VSS +10mV to VDD -10mV (max.)

MCP60x, MCP600x,MCP602x, MCP604x,MCP627x, MCP628x,MCP629x, MCP614x

MCP60x, MCP600x,MCP602x, MCP604x,MCP627x, MCP628x,MCP629x, MCP6S2x

InfraredMotionDetector

Local sensors are located relatively close to their signal conditioning circuits; therefore, the noise environment is not usuallyas severe as with remote sensors. In local sensing applications, non-inverting amplifiers are a good choice because theyrequire a minimal amount of discrete components.

This is a common sensor amplifier implementation andcould be used in many sensor applications.

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MCP617 Dual Operational Amplifier Features:n Low Power: IDD = 25 µA, max. n Low Offset Voltage: 150 µV, max.n Rail-to-Rail Swing at Outputn Low Input Offset Current: 0.3 nA, typicaln Specifications rated for 2.3V to 5.5V Suppliesn Unity Gain Stablen CMRR: 100 dB, typical

TC913A/TC913B Dual Auto-Zeroed Features:n First Monolithic Dual Auto-Zeroed Op Ampn Chopper Amplifier Performance without External

Capacitors— VOS: 15 µV max.— VOS: Drift; 0.15 µV/°C max.— Saves Cost of External Capacitors

n SOIC Packages Availablen High DC Gain; 120 dBn Low Supply Current; 650 µA

n Low Input Voltage Noise— 0.65 mVPP (0.1 Hz to 10 Hz)

n High CMRR: 116 dB, typical

MCP3002 Analog-to-Digital Converter Features:n 2.7V Dual Channel 10-Bit A/D Converter with SPI

Serial Interfacen ±1 LSB max. DNL; ±1 LSB max. INL n Analog inputs programmable as single-ended or

pseudo-differential pairsn Single supply operation: 2.7V - 5.5Vn Low power CMOS technology: 5 nA typical standby

current, 2 µA max.; 550 µA max. active current at 5V

TC1047A Temperature-to-Voltage Converter Features:n Output voltage is directly proportional to measured

temperaturen Accurately measures temperature from -40°C to

+125°Cn High temperature converter accuracy: ±2°C max.,

at 25°Cn Linear temperature slope: 10mV/°C (typical)n Available in space saving 3-pin SOT-23B packages

Amplifier: Example Design for Temperature Sensors

Remote Temperature Measurement: Thermocouple Circuit

Attributes

n Good Noise Immunityn Built In Test (BIT) Sensor

Fault Identification


The most widely measured phenomena in the processcontrol environment is temperature. Common elements,such as Resistance Temperature Detectors (RTDs),thermistors, thermocouples or silicon IC sensors areused to sense absolute temperatures, as well aschanges in temperature.

Remote sensors are connected to the amplifier via longwires, which often introduce noise into the electronics.The Common Mode Rejection Ratio (CMRR) of a differ-ential amplifier is used to minimize the noise signalthat is induced and common to both sensor inputs.

Applications

n Engine Controln Industrial Temperature Process Control

Attributesn Precision circuit for either resistive or capacitive

sensorsn Reliable oscillator start-upn Circuit topology is relatively immune from stray

capacitance, thus circuit can be used to accuratelysense small valued capacitive sensors located offthe PCB

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Op Amp oscillators can be used to accurately measureresistive and capacitive sensors. Oscillators do notrequire an analog-to-digital converter and provide a sensormeasurement whose accuracy is only limited by the

Amplifier: Example Designs with Oscillators for Resistive and Capacitive Sensors


RC Operational Amplifier Oscillators for Sensor Applications

accuracy of the reference clock signal. In addition, temperature correction can easily be provided with a silicon temperature sensor.

State Variable Oscillator

Related Application NoteAN866 Designing Operational Amplifier Oscillator Circuits For Sensor Applications (available for download fromwww.microchip.com)

Microchip products:

n MCP6001/2/4n MCP6021/2/3/4n MCP6271/2/3/4n MCP6281/2/3/4n MCP6291/2/3/4

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Applications

n Barometric altitude pressure sensorsn Engine turbine fan blade strain gauges

TC913 Dual Chopper Stabilized Operational Amplifier:n VOS: 15 µV (max.)n 6.5V to 16V single supply CMOS Op Ampn Low power IDD = 850 µA max.n 1.5 MHz GBWPn Unity gain stable

MCP606 Dual Single Supply Operational Amplifier:n 2.5V to 5.5V micropower CMOS Op Ampn Low power n Low offset voltage

Amplifier: Example Designs

Wheatstone Bridge Sensor Circuit


n Pressure Sensors

nStrain Gauge

MCP1541 Voltage Reference Features:n Low-cost voltage reference

MCP3201 Analog-to-Digital Converter Features:n 12-bit ADCn SPI interface

MCP41010 Digital Potentiometer Features:n 10k digital potentiometern SPI serial interface

Related Application NoteAN695 Interfacing Pressure Sensors to Microchip’s AnalogPeripherals (available for download fromwww.microchip.com)

Microchip produces complete solutions for your system sensor requirements. The instrumentation amplifier shown below,provides a low cost circuit to amplify the sensor signal. Next, an anti-aliasing low pass filter is provided to form a dataacquisition system with the ADC. The digital potentiometer can be used to bias the signal, which is especially useful insingle supply systems. Finally, the voltage reference provides a low cost accurate voltage signal for the Wheatstonebridge sensor.

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Operational Amplifier Filters

FilterLab is an innovative software tool that simplifies active filter design. Available at no cost from Microchip's web site(www.microchip.com), the FilterLab active filter software designtool provides full schematic diagrams of the filter circuit withcomponent values.

In addition, FilterLab software provides plots of the frequency,group delay and phase response of the filter.

FilterLab allows the design of low pass, band pass and highpass filters up to an 8th order filter with Chebyshev, Bessel orButterworth responses from frequencies of 0.1 Hz to 1 MHz.Users can select a flat passband or sharp transition frompassband to stopband. Options, such as minimum ripple factor, sharp transition and linear phase delay, are available.Once the filter response has been identified, FilterLab softwaregenerates the frequency response and the circuit. For maximum design flexibility, changes in capacitor values can be implemented to fit the demands of the application.FilterLab will recalculate all values to meet the desiredresponse, allowing real-world values to be substituted orchanged as part of the design process.

FilterLab also generates a SPICE model of the designed filter.Extraction of this model will allow time domain analysis inspice simulations, streamlining the design process. TheFilterLab software can be downloaded free from the Microchipweb site at www.microchip.com

FilterLab® Active Filter Design Software ToolFilterLab® Screen Captures

V/V

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Data Acquisition Design Software

MXLAB® Screen Captures

MXLAB software provides data acquisition, analysis and displayin a Windows environment. Additionally, analysis can be madeof the digital potentiometer shutdown, reset and daisy chainoperations. MXLAB software can determine digital potentiometersettings based on gain inputs (dB or V/V), filter cutoff frequen-cies and offset voltage levels. The MXLAB software can bedownloaded free from the Microchip web site atwww.microchip.com.

The MXLAB Windows software contains a variety of tools tointerface to the MXDEV™ Analog Evaluation System. Thesetools provide different methods of troubleshooting the analogcircuit in either the time or frequency domain:

n Fast Fourier Transform (FFT)

n Histogram

n Oscilloscope

n Real time numeric

n Real time stripchart

n Data List

MXDEV® Analog Evaluation SystemThe MXDEV® Analog Evaluation System is a versatile and easy-to-use system for evaluating Microchip’s MCP mixed-signal products. The system is used with a PC and consists oftwo parts: the DVMCPA Driver Board with associated MXLABsoftware which provides data acquisition, analysis and displayin a Windows environment; and the DVxxxxx Evaluation Board,which contains the device to be evaluated.

Evaluation boards are currently available for the MCP3001/02and MCP3004/08 10-bit ADCs, and the MCP3201/02 and MCP3204/08 12-bit ADCs, and the MCP42XXX digitalpotentiometers.

For the DV320x A/D converter evaluation boards, the input signal is either from from an on-board potentiometer or from anexternal source. In addition, low pass filters can be insertedinto the signal path for further flexibility. A prototype area allows the addition of custom circuitry to make a powerful forevaluation and development.

The DV42xxx digital potentiometer evaluation board shows the MCP42xxx being used in many popular digital applications.These circuits include programmable gain circuits, a program-mable filter circuit, and a programmable circuit. Digital potentiometer tools within MXLAB system calculate wiper values for these circuits based on user inputs of gain (in dB orV/V), filter cutoff frequency and approximation method, andoffset voltage. In addition, an ADC is on board that allowsanalysis of these circuits using the time and frequency domaintools of the MXLAB software.

Microchip Ordering Part Numbers;

DVMCPA MXDEV Analog Evaluation Driver Board Version 1

DV3201A MCP3001/3002 & MCP3201/02 A/D ConverterEvaluation Board

DV3204A MCP3004/3008 & MCP3204/08 A/D ConverterEvaluation Board

DV42xxx MCP42xxx Digital Potentiometer

MXLAB® Software Tool

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Selected Product Specifications

Programmable Gain Amplifiers-3dB (BW) IQ Vos Supply Temp.

Part # Channels (MHz) Typical (µV) Voltage (V) Range (°C) Features PackagesMCP6S21 1 2 to 12 1.1 mA 150 2.5 to 5.5 -40 to 85 SPI™, 8 Gain Steps, software shutdown 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP6S22 2 2 to 12 1.1 mA 150 2.5 to 5.5 -40 to 85 SPI™, 8 Gain Steps, software shutdown 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP6S26 6 2 to 12 1.1 mA 150 2.5 to 5.5 -40 to 85 SPI™, 8 Gain Steps, software shutdown 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP6S28 8 2 to 12 1.1 mA 150 2.5 to 5.5 -40 to 85 SPI™, 8 Gain Steps, software shutdown 16-Pin PDIP, 16-Pin SOIC

Operational Amplifiers# per IQ Typical Vos Max Supply Temp.

Part # Package GBWP (µA) (mV) Voltage (V) Range (°C) Features PackagesMCP6041(3) 1 14 kHz 0.6 3 1.4 to 5.5 -40 to +85 Rail-to-Rail Input/Output 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOP, 5-Pin SOT23MCP6042 2 14 kHz 0.6 3 1.4 to 5.5 -40 to +85 Rail-to-Rail Input/Output 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP6044 4 14 kHz 0.6 3 1.4 to 5.5 -40 to +85 Rail-to-Rail Input/Output 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP6141(3) 1 100 kHz 0.6 3 1.4 to 5.5 -40 to +85 Rail-to-Rail Input/Output, G≥10 stable 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP6142 2 100 kHz 0.6 3 1.4 to 5.5 -40 to +85 Rail-to-Rail Input/Output, G≥10 stable 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP6144 4 100 kHz 0.6 3 1.4 to 5.5 -40 to +85 Rail-to-Rail Input/Output, G≥10 stable 14-pin PDIP, 14-pin SOIC, 14-pin TSSOPMCP606(8) 1 155 kHz 19 0.25 2.5 to 5.5 -40 to +85 Rail-to-Rail output 8-Pin PDIP, 8-Pin SN, 8-Pin TSSOP, 5-Pin SOT23MCP607 2 155 kHz 19 0.25 2.5 to 5.5 -40 to +85 Rail-to-Rail output 8-Pin PDIP, 8-Pin SOIC, 8-Pin TSSOPMCP609 4 155 kHz 19 0.25 2.5 to 5.5 -40 to +85 Rail-to-Rail output 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP616(8) 1 190 kHz 19 0.15 2.3 to 5.5 -40 to +85 Rail-to-Rail output 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP617 2 190 kHz 19 0.15 2.3 to 5.5 -40 to +85 Rail-to-Rail output 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP619 4 190 kHz 19 0.15 2.3 to 5.5 -40 to +85 Rail-to-Rail output 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP6001 1 1 MHz 140 7 1.8 to 5.5 -40 to +85 Rail-to-Rail Input/Output 5-Pin SOT23, 5-Pin SC-70MCP6002 2 1 MHz 140 7 1.8 to 5.5 -40 to +85 Rail-to-Rail Input/Output 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP6004 4 1 MHz 140 7 1.8 to 5.5 -40 to +85 Rail-to-Rail Input/Output 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP601(3) 1 2.8 MHz 230 2 2.7 to 5.5 -40 to +85 Rail-to-Rail output 8-Pin PDIP, 8-Pin SOIC, 8-Pin TSSOP, 5-Pin SOT-23MCP602 2 2.8 MHz 230 2 2.7 to 5.5 -40 to +85 Rail-to-Rail output 8-Pin PDIP, 8-Pin SOIC, 8-Pin TSSOPMCP604 4 2.8 MHz 230 2 2.7 to 5.5 -40 to +85 Rail-to-Rail output 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP6021(3) 1 10 MHz 1000 0.5 2.5 to 5.5 -40 to +85 Rail-to-Rail Input/Output 8-Pin PDIP, 8-Pin SOIC, 8-Pin TSSOPMCP6022 2 10 MHz 1000 0.5 2.5 to 5.5 -40 to +85 Rail-to-Rail Input/Output 8-Pin PDIP, 8-Pin SOIC, 8-Pin TSSOPMCP6024 4 10 MHz 1000 0.5 2.5 to 5.5 -40 to +85 Rail-to-Rail Input/Output 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP6271(3) 1 2 MHz 170 3 2.0 to 5.5 -40 to +125 Rail-to-Rail Input/Output, extended temp. 8-Pin PDIP, 8-Pin SOIC, 8-pin MSOPMCP6272 2 2 MHz 170 3 2.0 to 5.5 -40 to +125 Rail-to-Rail Input/Output, extended temp. 8-Pin PDIP, 8-Pin SOIC, 8-pin MSOPMCP6274 4 2 MHz 170 3 2.0 to 5.5 -40 to +125 Rail-to-Rail Input/Output, extended temp. 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP6281(3) 1 2 MHz 450 3 2.2 to 5.5 -40 to +125 Rail-to-Rail Input/Output, extended temp. 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP6282 2 2 MHz 450 3 2.2 to 5.5 -40 to +125 Rail-to-Rail Input/Output, extended temp. 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP6284 4 2 MHz 450 3 2.2 to 5.5 -40 to +125 Rail-to-Rail Input/Output, extended temp. 14-Pin PDIP, 14-Pin SOIC, 14-pin TSSOPMCP6291(3) 1 10 MHz 1000 3 2.4 to 5.5 -40 to +125 Rail-to-Rail Input/Output, extended temp. 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP6292 2 10 MHz 170 3 2.4 to 5.5 -40 to +125 Rail-to-Rail Input/Output, extended temp. 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP6294 4 10 MHz 1000 3 2.4 to 5.5 -40 to +125 Rail-to-Rail Input/Output, extended temp. 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPTC1029 2 90 kHz 6 0.5 1.8 to 5.5 -40 to +85 Rail-to-Rail Input/Output 8-Pin PDIP, 8-Pin MSOP, 8-Pin SOICTC1030 1 90 kHz 5 0.5 1.8 to 5.5 -40 to +85 Rail-to-Rail Input/Output, Shutdown pins 16-Pin QSOPTC1034 1 90 kHz 6 0.5 1.8 to 5.5 -40 to +85 Rail-to-Rail Input/Output 5-Pin SOT-23ATC1035 1 90 kHz 6 0.5 1.8 to 5.5 -40 to +85 Rail-to-Rail Input/Output, Shutdown pins 6-Pin SOT-23ATC913 2 1.5 MHz 650 0.015 6.5 to 16 0 to +70 Auto-zero, single & split supply 8-Pin PDIPTC7650 1 2.0 MHz 2000 0.005 6.5 to 16 0 to +70 Chopper stabilized 8-Pin PDIP, 14-Pin PDIPTC7652 1 0.4 MHz 1000 0.005 6.5 to 16 0 to +70 Chopper stabilized, low noise 8-Pin PDIP, 14-Pin PDIP

Analog-to-Digital Converters (SAR)Resolution Max. Samp. Rate # of Input Input Input Volt. Max. Supply Max.

Part # (bits) (ksamples/sec) Channels Type Interface Range (V) Current (µA) INL PackagesMCP3001 10 200 1 Single-ended SPI™ 2.7 to 5.5 500 ±1 LSB 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOP, 8-Pin TSSOPMCP3002 10 200 2 Single-ended SPI™ 2.7 to 5.5 650 ±1 LSB 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOP, 8-Pin TSSOPMCP3004 10 200 4 Single-ended SPI™ 2.7 to 5.5 550 ±1 LSB 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOP MCP3008 10 200 8 Single-ended SPI™ 2.7 to 5.5 550 ±1 LSB 16-Pin PDIP, 16-Pin SOICMCP3201 12 100 1 Single-ended SPI™ 2.7 to 5.5 400 ±1 LSB 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOP, 8-Pin TSSOPMCP3202 12 100 2 Single-ended SPI™ 2.7 to 5.5 550 ±1 LSB 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOP, 8-Pin TSSOPMCP3204 12 100 4 Single-ended SPI™ 2.7 to 5.5 400 ±1 LSB 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP3208 12 100 8 Single-ended SPI™ 2.7 to 5.5 400 ±1 LSB 16-Pin PDIP, 16-Pin SOICMCP3301 13 100 1 Differential SPI™ 2.7 to 5.5 450 ±1 LSB 8-Pin PDIP, 8-Pin SOIC, 8-Pin MSOPMCP3302 13 100 2 Differential SPI™ 2.7 to 5.5 450 ±1 LSB 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP3304 13 100 4 Differential SPI™ 2.7 to 5.5 450 ±1 LSB 16-Pin PDIP, 16-Pin SOICMCP3021 10 22 1 Single-ended I2C 2.7 to 5.5 250 ±1 LSB 5-Pin SOT-23AMCP3221 12 22 1 Single-ended I2C 2.7 to 5.5 250 ±2 LSB 5-Pin SOT-23AMicrochip also carries a broad portfolio of Sigma-Delta and Dual Slope Analog-to-Digital Converters. See website for complete product offerings

Voltage Output Temperature SensorsTypical Max. Accuracy Max. Temp. Vcc Max. Supply

Part # Accuracy (°C) @ 25°C (°C) Range (°C) Range (V) Current (µA) Features Packages TC1046 ±0.5 ±2 -40 to +125 +2.7 to +4.4 60 High precision temperature-to-voltage converter, 6.25 mV/°C 3-Pin SOT-23BTC1047 ±0.5 ±2 -40 to +125 +2.7 to +4.4 60 High precision temperature-to-voltage converter, 10 mV/°C 3-Pin SOT-23BTC1047A ±0.5 ±2 -40 to +125 +2.5 to +5.5 60 High precision temperature-to-voltage converter, 10 mV/°C 3-Pin SOT-23B

Voltage ReferencesVcc Output Max. Load Initial Temperature Max. Supply

Part # Range (V) Voltage (V) Current (mA) Accuracy (max.%) Coefficient (ppm/°C) Current (µA @ 25°C) PackagesMCP1525 2.7 to 5.5 2.5 ±2 ±1 50 100 3-Pin TO-92, 3-Pin SOT-23BMCP1541 4.3 to 5.5 4.096 ±2 ±1 50 100 3-Pin TO-92, 3-Pin SOT-23B

Digital PotentiometersPart # # of Taps # per package Interface Resistance (ohms) INL (max) DNL(max) Temp. Range (°C) PackagesMCP41010 256 1 SPI™ 10K ±1 LSB ±1 LSB -40 to +85 8-Pin PDIP, 8-Pin SOICMCP41050 256 1 SPI™ 50K ±1 LSB ±1 LSB -40 to +85 8-Pin PDIP, 8-Pin SOICMCP41100 256 1 SPI™ 100K ±1 LSB ±1 LSB -40 to +85 8-Pin PDIP, 8-Pin SOICMCP42010 256 2 SPI™ 10K ±1 LSB ±1 LSB -40 to +85 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP42050 256 2 SPI™ 50K ±1 LSB ±1 LSB -40 to +85 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOPMCP42100 256 2 SPI™ 100K ±1 LSB ±1 LSB -40 to +85 14-Pin PDIP, 14-Pin SOIC, 14-Pin TSSOP

See Microchip Product Line Card for complete product selection and specifications

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Op AmpsAN679: Temperature Sensing Technologies. This application notecovers the most popular temperature sensor technologies to alevel of detail that will give the reader insight into how to deter-mine which sensor is most appropriate for the application. Thisnote is written from the perspective of catering to the complexissues of the sensing environment and required accuracy.

AN681: Reading and Using Fast Fourier Transformation (FFT).If there is an Analog-to-Digital converter in the signal path, thereare three fundamental issues that can be examined when assessingthe circuit’s performance. This application note discusses the threeareas of concern that encompass the use of frequency analysis(FFTs), time analysis, and DC analysis techniques.

AN684: Single Supply Temperature Sensing with Thermocouples.This application note focuses on circuit solutions that use thermocouples in the design. The signal conditioning path for thethermocouple system is discussed in this application note followedby complete application circuits.

AN685: Thermistors in Single Supply Temperature Sensing. Circuits.There are a variety of temperature sensors on the market all of which meet specific application needs. This application note discusses the most common sensors that are used to solve theseapplication problems including the thermocouple, ResistiveTemperature Detector (RTD) thermistor, and silicon-based sensors.

AN687: Precision Temperature Sensing with RTD Circuits.Temperature is one of the most widely measured phenomena inthe process control environment. This application note discusseshow common elements such as Resistance Temperature Detectors(RTDs), thermistors, thermocouples or diodes are used to senseabsolute temperatures as well as changes in temperature.

AN695: Interfacing Pressure Sensors to Microchip's AnalogPeripherals. This application note concentrates on the signalconditioning path of the piezoresistive sensing element from sensorto microcontroller. It shows how the electrical output of this sensorcan be gained, filtered and digitized in order to ready it for themicrocontroller’s calibration routines.

AN699: Anti-Aliasing, Analog Filters for Data Acquisition SystemsAnalog filters can be found in almost every electronic circuit. Audio systems use them for preamplification, equalization, and tone control. In communication systems, filters are used for tuning in specific frequencies and eliminating others. Digital signal processing systems use filters to prevent the aliasing of out-of-band noise and interference.

AN722: Operational Amplifier Topologies and DC SpecificationsThis application note defines the DC specifications of op ampsand presents circuit applications where optimization of a particularspecification is critical.

AN723: Operational Amplifier AC Specifications and Applications.This application note defines the ac specifications of voltage feedback operational amplifiers (Op Amps). Directly following these definitions, related amplifier circuits are given where theramifications of the particular specifications causes less than optimum circuit performance.

AN866: Designing Operational Amplifier Oscillator Circuits For Sensor Applications. Operational amplifier (op amp) oscillatorscan be used to accurately measure resistive and capacitive sensors. This application note will show you procedures to simplifyoscillator design. Operational amplifier (op amp) oscillators can beused to accurately measure resistive and capacitive sensors.

Digital PotsAN691: Optimizing the Digital Potentiometer in Precision CircuitsIn this application note, circuit ideas are presented that use thenecessary design techniques to mitigate errors, consequently optimizing the performance of the digital potentiometer.

AN692: Using a Digital Potentiometer to Optimize a PrecisionSingle Supply Photo Detect. This application note shows how theadjustability of the digital potentiometer can be used to an advantagein photosensing circuits.

SAR ADCAN246: Driving the Analog Inputs of a SAR A/D Converter. This application note delves into the issues surrounding the SARConverter’s input and conversion nuances to insure that the con-verter is handled properly from the beginning of the design phase.

AN688: Layout Tips for 12-Bit A/D Converter Application. This application note provides basic 12-bit layout guidelines, ending witha review of issues to be aware of. Examples of good layout andbad layout implementations are presented throughout.

AN693: Understanding A/D Converter Performance Specifications.This application note describes the specifications used to quantifythe performance of A/D converters and give the reader a betterunderstanding of the significance of those specifications in anapplication.

AN842: Differential ADC Biasing Techniques, Tips and Tricks. Truedifferential converters can offer many advantages over single-endedinput A/D Converters (ADC). In addition to their common moderejection ability, these converters can also be used to overcomemany DC biasing limitations of common signal conditioning circuits.

AN845: Communicating With The MCP3221 Using PICmicro®Microcontrollers. This application note will cover communicationsbetween the MCP3221 12-bit A/D Converter and a PICmicro®microcontroller. The code supplied with this application note iswritten as relocatable assembly code.

Dual Slope ADC AN780: 15-Kilogram Scale Using the TC520 (TC500/A, TC520).This project takes into account all aspects of a functional scale:Dynamic Range, Strain Gauge Compensation, Zeroing,Oversampling, Units Conversion (kilograms to pounds).

AN789: Integrating Converter Analog Processor (TC500A).Today, design engineers rely more on microprocessors and microcontrollers to support their applications. Compatible analog-to- digital (A/D) and digital-to-analog (A/D) converters havegreatly increased the flexibility of interface and control circuits.

Programmable Gain Amplifier (PGA)

AN248: Interfacing MCP6S2X PGAs to PICmicro® Microcontroller.This application note shows how to program the six channelMCP6S26 PGA gains, channels and shutdown registers using thePIC16C505 microcontroller.

AN251: Bridge Sensing with the MCP6S2X PGAs. Describes how anexternal A/D converter and a PGA can easily be used to convertthe difference voltage from resistor bridge sensors to usable digital words for manipulation by the microcontroller.

AN865: Sensing Light with a Programmable Gain Amplifier. Thisapplication notes discusses how Microchip’s Programmable GainAmplifiers (PGAs) can be effectively used in position photo sensingapplications minus the headaches of amplifier stability.

TB065: Linear Circuit Devices for Applications in Battery PoweredWireless Systems. This technical brief introduces the reader toMicrochip broad portfolio of linear circuit devices.

Related Application NotesComplete Application Note library is available on the Microchip website: www.microchip.com


Microchip Technology’s Analog & Interface Product Families

Information subject to change. The Microchip name and logo, PIC, are registered trademarks of Microchip Technology Incorporated in the U.S.A. and other countries.FanSense and SelectMode are trademarks of Microchip Technology in the U.S.A. and other countries. IrDA is a registered trademark of Infrared Data Association. All other

trademarks mentioned herein are the property of their respective companies. © 2003, Microchip Technology Inc. All rights reserved. DS21825A 9/2003

Microchip Technology Inc. • 2355 W. Chandler Blvd. • Chandler, AZ 85224-6199 • (480) 792-7200 • Fax (480) 792-9210

Microchip Technology Inc. is a leading provider of microcontroller, analog and memory products that provide risk-free product development, lower total system costand faster time to market for thousands of diverse customer applications worldwide. Microchip’s commit-ment to quality and innovation coupled with world-classdevelopment tools, dependable delivery and outstandingtechnical support sets us apart.

Analog & Interface Attributes Robustnessn MOSFET Drivers lead the industry in latch-up

immunity/ stability

Low Power/Low Voltagen Op Amp family with the lowest power for a given gain

bandwidthn 600nA/1.4V/10kHz bandwidth Op Ampsn 1.8V charge pumps and comparatorsn Lowest power 12-bit ADC in SOT-23 package

Integrationn One of the first to market with integrated LDO with

Reset, and Fan Controller with temperature sensorn PGA integrates MUX, resistive ladder, gain switches,

high-performance amplifier, SPI™ interface

Space Savingsn Resets and LDOs in SC70, ADCs in 5-lead SOT-23n CAN and IrDA®Standard protocol stack embedded in

an 18-pin package

Accuracyn Offset trimmed after packaging using non-volatile

memory

Innovationn Low pincount embedded IrDA Standard stack,

FanSense™ technologyn SelectMode™ operation

For more information, visit the Microchip website atwww.microchip.com

A Leading Provider of Microcontroller and Analog Products

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