switched current source type d to a converter
TRANSCRIPT
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SWITCHED CURRENT SOURCE TYPE
D to A CONVERTER Prepared by
KETAN NAYAK (140413117005) HARSH PARMAR (140413117006)
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INDEX• Introduction• Types of Converters -A to D Converter -D to A Converter • D to A Converter• Types of D to A Converter• Switch Current Source Type DAC • Applications of DAC
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INTRODUCTION• A Digital to Analog converter (DAC) is a
device that converts digital numbers (binary) into an analog voltage or current output.
DAC101010101010101010101010
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Input/Output Characteristics
5
Digital Input Signal
Ana
log
Out
put S
igna
l
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Types of Converters1. Analog to Digital Converters
2. Digital to Analog Converters
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Analog to Digital Converter
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Digital to Analog Converter
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Types of D/A Converters1. R-2R ladder type DAC
2. Weighted resistor type DAC
3. Switched current source type DAC
4. Switched capacitor type DAC
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R-2R Ladder Type DAC
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Weighted Resistor Type DAC
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Switched Capacitor Type DAC
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Switch Current Source Type DAC Introduction
• The R-2R Ladder Type Network DAC and the Weighted Resistor DAC can be Regarded as a Switch Voltage Source Type DAC.
• Because when the Input Position goes HIGH, the High Voltage is Effectively Switched into Circuit.
• Most of IC’s DAC use a form of Current Switching Rather than Voltage Switching Because Current can be Switched out Faster than Voltage.
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Switch Current Source type DAC
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Applications of DAC• Generic use• Digital Audio • Function Generators/Oscilloscopes• Motor Controllers
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Generic Use• Used when a continuous analog signal is
required.• Signal from DAC can be smoothed by a
Low pass filter
0 bit
nth bit
n bit DAC011010010101010100101101010101011111100101000010101010111110011010101010101010101010111010101011110011000100101010101010001111
Digital Input
Filter
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Digital Audio• CD Players• MP3 Players• Digital Telephone/Answering Machines
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Function Generators• Digital Oscilloscopes
– Digital Input– Analog Ouput
• Signal Generators– Sine wave generation– Square wave generation– Triangle wave generation– Random noise generation
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Motor Controllers• Cruise Control• Valve Control • Motor Control
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