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Any and all SANYO products described or contained herein do not have specifications that can handleapplications that require extremely high levels of reliability, such as life-support systems, aircraftscontrol systems, or other applications whose failure can be reasonably expected to result in seriousphysical and/or material damage. Consult with your SANYO representative nearest you before usingany SANYO products described or contained herein in such applications.

SANYO assumes no responsibility for equipment failures that result from using products at values thatexceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or otherparameters) listed in products specifications of any and all SANYO products described or containedherein.

Monolithic Linear IC

VCO Non-Adjusting PLL FM MPXStereo Demodulator with FM Accessories

Ordering number:ENN1868C

LA3401

Package Dimensionsunit:mm3059-DIP22S

[LA3401]

SANYO : DIP22S

OverviewThe LA3401 is a multifunctional MPX demodulator ICdesigned for FM stereo electronic tuning. It features theVCO non-adjusting function that eliminates the need toadjust free-running frequency of VCO and the accessoryfunctions such as FM/AM input, FM/AM input changeover,muting.

Applications Home stereos, portable hi-fi sets.

Functions VCO non-adjusting function. PLL MPX stereo demodulator. Gain variable type post amplifier. FM-AM changeover. Muting at the FM-AM changeover mode (changeover

mute) Muting function. Drive pin for external muting. VCO stop function. Separation adjust function. Muting at the V CC-ON mode.

Features Non-adjusting VCO : Eliminates the need to adjust free-

running frequency. Good temperature characteristic of VCO : 0.1% typ. for

50C change. Less high frequency distortion of stereo main signal

(0.07% typ. at f=10kHz) (Non-adjusting PLL makes itpossible to make the capture range narrower, providingless high frequency beat distortion of stereo main sig-nal.)

Low distortion : Mono 0.01% typ.Main 0.025% typ.

High S/N : 91dB typ./mono 300mV input, LPF94dB typ./mono 400mV input, LPF

High voltage gain : Approximately 13dB (Commonto FM,AM at standard constants) This gain can be varied byexternal constants.

Wide dynamic range : Distortion 1.0%/mono 800mV,1kHz input (Post amplifier gain :Approximately 13dB)

The semifixed resistor (pin 4) for separation adjust can bechanged to a fixed resistor or can be removed.

High ripple rejection : 34dB typ.

21.2

0.95 0.48 1.71.78

3 . 9

m a x

0 . 5

1 m i n

6 . 4

7 . 6

2

3 . 3

3 . 2

5

0 . 2

5

1 11

22 12

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LA3401

SpecificationsAbsolute Maximum Ratings at Ta = 25C

C

C

Ta 45C

Operating Conditions at Ta = 25C

Operating Characteristics at Ta = 25C, V CC=13V, f=1kHz, input 400mV, L+R=90%, pilot=10%

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(Note) *1 : The signal voltage after separation adjust is measured.*2 : The maximum voltage applied to pin 10 (FM/AM changeover voltage) is set to V CC2V (not exceeding 10V).*3 : Capture range is defined by :

Capture range = 100 [%]

Where F0 : Free-running frequncy

F0F1F1 F0456456

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LA3401

Test Circuit

* : CSB456F 11typ (Murata)LPF : BL-13 (Korin Giken)amp : THE=0.005% max, V NI=1V max, band width : 100kHz min, ri=330k max.VG : S/N, muting attenuation, crosstalk measurement=50dBmin, Other measurements than above=0dB

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LA3401

Sample Application Circuit

(Note 1) Connect pin 14 to GND through a capacitor of 0.01 F or greater.

(Note 2) For R11, C9, it is recommended to use thefollowing values according to an IF IC to beused.

* : CBS456F11 (Murata)KBR-457HS (Kyocera)

CIFI 11R 9C

5321AL k3.3 22.0

N1321,0321,5621AL k6.5 22.0

0621AL k01 1.0

Sample Printed Circuit Pattern

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LA3401

External Parts

Note 1 : For C9, R11 setting, refer to Sample Application Circuit (Note 2) and Note 2 for Using IC.Note 2 : To advance stereo operation start timing, the value of C10 is decreased. Decreasing the value of C10 narrows

capature range. This narrowing also depends on the value of C9. It is recommended to use C10 of 0.47 F orgreater.

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Continued on next page.

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LA3401

Continued from preceding page.

.oNtraP ]V[egatloV emaNniP skrameR

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V CC

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Note for Using IC1. Ceramic resonator

(1) Shown below are ceramic resonators recommended for use in the LA3401.Type No. SupplierCSB456F11 MurataKBR-457HS Kyocera

(2) By externally connecting a capacitor in parallel with a ceramic resonator, ceramic resonators shown below can bealso used.

Ceramic resonator Parallec external capacitorCSB456F10 (Murata) 20pFKBR-457HS1 (Kyocera) 15pF

2. Capture range and PLL loop filter constants(1) It is desirable that the capture range, which is related to the stereo distortion, should be set in the range where the

capture range does not depend on the pilot level. For example, when the PLL loop filter constants are C9=0.22 F,C10=1 F, R11=3.3k , the capture range characteristic becomes as shown in Fig. 1. For these loop filter constants,it is desirable that the input pilot level should be approximately 20mV or greater where the capture range does notdepend on the pilot level. Figs. 2, 3 shows how the capture range characteristic changes with the loop filter con-stants.

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LA3401

(2) Fig. 5 shows how the capture range changes withloop filter constant R11.

(3) Fig. 6 shows how the distortion of stereo main (L +

R) changes with loop filter C9.

3. VCO stop methodThe relation between VCO stop supply V S and limitingresistor R S is shown in Fig. 7. R S must be set so that thevoltage on pin 17 is within the specified range when V Sis applied. For example, it is seen from Fig. 7 that thevalue of R S is approximately 33k when the voltage onpin 17 is set to 7V at V S=12V. The relation between R Sand the voltage on pin 17 at the VCO stop mode is shownin Fig. 8. The voltage on pin 17 at the VCO stop modeincreases with increasing R S. The lower value on pin 17is set by adding an increase in the voltage to the mini-mum value specified.

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LA3401

4. Forced monaural modeTo provide the forced monaural mode, pin 16 is con-nected to GND through a resistor of 10k . In this case,VCO oscillation does not stop.

FM/AM mode changeover(1) How to change over

Changeover is performed by externally applying volt-

age to pin 10.FM AM changeover : Apply a voltage of 4.3V toVCC2 (not exceeding 10V) to pin.AM FM changeover : Apply a voltage of 0.5V or lessto pin 10.Fig. 9 shows the relation between the voltage on pin 10and the flow-in current.

(2) Muting in the changeover modeMuting is turned ON for a certain period of time fixedby external capacitor C6 in the FM AM or AM FM changeover mode (muting in the changeover mode).Fig. 10 shows the relation between the muting time inthe chageover mode and C6.

(3) VCO oscillation stop in the AM modeBy externally applying a specified voltage to pin 10 to select the AM mode, VCO oscillation stops automatically andthe monaural mode is forced to be entered.

Muting function(1) How to turn ON/OFF muting

Muting is turned ON/OFF by externally applying voltage to pin 15.Muting ON : Apply a voltage of 3.5V to V CC3V to pin 15.Muting OFF : Apply a voltage of 0.3V or less to pin 15.

Fig. 9 shows the relation between the voltage on pin 15 and the flow-in current.(2) Hysteresis characteristic

Muting ON/OFF is allowed a hysteresis of approximately 6dB to prevent malfunction attributable to ripple in-cluded in the IF meter output, muting drive output.

(3) Forced monaural in the muting mode

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LA3401

Muting outputSince the muting signal is delivered at the muting output (pin 11) in the following mode, external transistors can beused to provide external muting.

AM FM changeover mode (muting in the changeover mode) Muting mode VCCON/OFF mode

Fig. 11 shows a sample application of external muting.

Muting in the V CC-ON mode1. Muting time

Muting is turned ON for a certain period of time fixedby external capacitor C13. Fig. 12 shows the relationbetween the muting time and C13.

2. Values of AM/FM input coupling capacitors (C1, C2) and value of C13If muting is released before the DC voltage on the AM input (pin 1) or FM input (pin 2) is stabilized after V CC isturned ON, pop noise is generated. Therefore, the value of C13 must be determined by the input coupling capacitorvalue. The adequate value of C13 for C1, C2 of 10 F is 10 F or thereabouts. If the value of C1, C2 is increased, thevalue of C13 is also increased accordingly.

Feedback resistance of post amplifier and total gain, de-emphasis constant valuesTable 1 shows the feedback resistance of post amplifier and total gain, de-emphasis

Table 1. Feedback resistance of post amplifier and total gain, de-emphasis

Total gain : Value in monaural modeR1 C15=R2 C14=50 s, 75 s

)2R(1R latoT s05)41C(31C sm05)41C(31C

k33

k93

k15

k26

k28

k001

k031

k051

k081

Bd0.3Bd5.4Bd5.6Bd5.8Bd0.11Bd0.31Bd0.51Bd0.61Bd5.71

Fp0051Fp0021Fp0001

Fp057Fp026Fp015Fp093Fp033Fp072

Fp0022Fp0002Fp0051Fp0021

Fp019Fp057Fp065Fp015Fp093

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LA3401

How to externd the dynamic range of the post amplifierIn the Sample Application Circuit of the LA3401 the dynamic range of the post amplifier is extended by connectingresistors R12, R13 across the virtual GND points (pins 6, 7) of the post amplifier and GND as shown in Fig. 13 to setthe output (pins 5, 8) DC voltages to an adequate value.The DC voltages on pins 5, 8 are obtained as follows :

3.3 RB + R1RB=3.3 1+ R1RB

3.3RB + R2

RB=3.3 1+

R2RB

The upper and lower loss voltages of the post amplifier outputare approximately 2V and 0.5V respectively as shown in Fig.14. With these loss voltages considered, the voltages on pins5, 8 are set.In the Sample Application Circuit the voltages on pins 5, 8 areset to 6V and the maximum output voltage is obtained atVCC=13V.

The Sample Application Circuit provides the reducedvoltage characteristic at approximately 9V. If the reducedvoltage characteristic at approximately 6V is required,

remove R12, R13 shown in the Sample ApplicationCircuit. Then, the output (pins 5, 8) DC voltages becomesapproximately 3.3V and the reduced voltage characteristicbecomes as shown in Fig. 15. Fig. 15 shows the THD vs.VCC characteristic, but other characteristics such asseparation are also available at V CC=6V by removingR12, R13.

Low-pass filterFig. 16 shows a sample circuit configuration where anLC filter is used as the low-pass filter and Fig. 17 showsa sample characteristic of this filter. As compared with the LPF (BL-13) in the Sample Applicatin Circuit, the use of this filter makes the attenuation less at 19kHz, 38kHz : therefore, carrier leak at the LPF output causes the stereodistortion and separation characteristic to get worse than specified in the Operating Characteristics. For the stereodistortion, the BL-13 provides approximately 0.02%, while the LC filter provides approximately 0.5%.

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LA3401

Decorder circuit (Refer to the Block Diagram in the Sample Application Circuit.)The LA3401 adopts a decoder circuit of chopper type. The sub signal syncdetected by this decoder is applied to the postamplifier minus input through Rb as shown in the Sample Application Circuit. This signal is matrixed with the mainsignal coming out of amplifier A5 and passing through R C.

The gain for the sub signal is :

R1, R2 : Post amplifier feedback resistor

VS : Peak value of input sub signalThe gain for the main signal is : VR1 : Semifixed resistor for separation adjust

VM : Peak value of input main signal

In the LA3401, the gain of the main signal is varied with VR1 to adjust the separation. Since the IF output is generallysuch that the sub signal level is lower than the main signal level, the separation can be adjusted by attenuating the mainsignal level with VR1. The use of an antibirdie filter across the IF output and the FM input of the LA3401 may cause thesub signal level to be raised, and when the sub signal level is higher than the main signal level the separation cannot beadjusted with VR1. In this case, the sub signal level is attenuated to be less than the main signal level and applied to theLA3401 and the separation is adjusted with VR1.

VS or V S R1Rb

2

R2Rb

2

VM or V M VR1

Ra + VR1R1Rc

VR1Ra + VR1

R2Rc

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Specifications of any and all SANYO products described or contained herein stipulate the performance,characteristics, and functions of the described products in the independent state, and are not guaranteesof the performance, characteristics, and functions of the described products as mounted in the customer'sproducts or equipment. To verify symptoms and states that cannot be evaluated in an independent device,the customer should always evaluate and test devices mounted in the customer's products or equipment.

SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and allsemiconductor products fail with some probability. It is possible that these probabilistic failures couldgive rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,or that could cause damage to other property. When designing equipment, adopt safety measures sothat these kinds of accidents or events cannot occur. Such measures include but are not limited to protectivecircuits and error prevention circuits for safe design, redundant design, and structural design.In the event that any or all SANYO products(including technical data,services) described orcontained herein are controlled under any of applicable local export control laws and regulations,such products must not be exported without obtaining the export license from the authoritiesconcerned in accordance with the above law.

No part of this publication may be reproduced or transmitted in any form or by any means, electronic ormechanical, including photocopying and recording, or any information storage or retrieval system,or otherwise, without the prior written permission of SANYO Electric Co., Ltd.

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Information (including circuit diagrams and circuit parameters) herein is for example only ; it is notguaranteed for volume production. SANYO believes information herein is accurate and reliable, butno guarantees are made or implied regarding its use or any infringements of intellectual property rightsor other rights of third parties.

LA3401

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