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Ordering number:ENN573F
Monolithic Linear IC
LA3161
2-Channel Preamplifier For Car Stereo
Features
* On-chip 2 preamplifiers. * Good ripple rejection owing to on-chip voltage regulator. * Minimum number of external parts required. * Low noise. * 8-pin SIP package facilitating easy mounting. * Pin-compatible with LA3160.
Package Dimensions
unit:mm 3016B-SIP8
[LA3161]
22.3 1.5
0.51 min 5.7 max
3.0
4.8
1.0
1 2.26 2.54 0.5 1.3
8
3.2
0.25 1.35
Specifications
Absolute Maximum Ratings at Ta = 25C
Parameter Maximum Supply Voltage Allowable Power Dissipation Operating Temperature Storage Temperature Symbol VCC max Pd max Topr Tstg Conditions
SANYO : SIP8
Ratings 18 200 -20 to +75 -40 to +125
Unit V mW
C C
Recommended Operating Conditions at Ta = 25C
Parameter Supply Voltage Load Resistance Symbol VCC RL Conditions Ratings 9 10k Unit V
Operating Conditions at Ta = 25C, VCC=9V, RL=10k, Rg=600, f=1kHz, NAB
Parameter Current Dissipation Voltage Gain Output Voltage Total Harmonic Distortion Input Resistance Symbol ICC VG VO THD ri Closed loop Open loop, VO=0.77V THD=1% VO=0.5V 70k 70 1.0 Conditions Ratings min typ 6.5 35 78 1.3 0.05 100k 0.30 max 8.0 Unit mA dB dB V %
Continued on next page.
Any and all SANYO products described or contained herein do not have specifications that can handle applications that require extremely high levels of reliability, such as life-support systems, aircraft's control systems, or other applications whose failure can be reasonably expected to result in serious physical and/or material damage. Consult with your SANYO representative nearest you before using any SANYO products described or contained herein in such applications. SANYO assumes no responsibility for equipment failures that result from using products at values that exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges,or other parameters) listed in products specifications of any and all SANYO products described or contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
10700TH (KT)/N0493TH/7160TS/O137KI/8044KI/9250KI, TS No.573-1/7
LA3161
Continued from preceding page.
Parameter Equivalent Input Noise Voltage Crosstalk Ripple Rejection Symbol VNI CT Rr Rg=2.2k Rg=2.2k -50 Conditions Ratings min typ 1.2 -65 -40 max 2.0 Unit F dB dB
Equivalent Circuit Block Diagram
Test Circuit1 : VO, VG, THD, ICC, ri
Test Circuit2 : VGO
Test Circuit3 : Noise
No.573-2/7
LA3161
Sample Application Circuit 1 : Preamplifier for Car Stereo
Function of External Parts C2, C4 are input coupling capacitors. In NAB equalizer amplifier, the gain at low frequencies is high and 1/f noise inside the IC is emphasized as output noise. Therefore, if the reactance of capacitor at low frequencies is increased, the dependence of 1/f noise on the signal source resistance causes the output noise voltage to deteriorate, and the value of reactance must be made small enough as compared with the signal source resistance. C2, C4 also influence the operation start time and the adequate value of these capacitors is 10F. (Since C2, C4 of less than 4.7F make the operation start time longer, use C2, C4, of 4.7F or more). C5, C11 are NF capacitors. The lower cut-off frequency depends on the value of these capacitors. If the lower cut-off frequency is taken as fL : C5 (C11) = 1/2 * fL * R2 (R7) If the value of this capacitor is made larger, the operation start time of amplifier is more delayed. The adequate value of capacitor is 47F. The frequency characteristic of the equalizer amplifier depends on C6 and R4, R3 (C10 and R5, R6). The time constants to obtain the standard NAB characteristic are as shown below.
Tape speed
9.5cm/s 3180s 90s
4.75cm/s 1590s 120s
C6 (R3 + R4) R3 C6
C8 is bias capacitor for the power line. C8 of 47F is inserted at a point as close to the power supply pin (pin 4) as possible. C1, C3 are for preventing radio interference in the strong electric field, interference attributable to engine noise, and blocking oscillation at the time of large amplitude operation. The adequate value of C1, C3 is approximately 1000pF. C7, C9 are output coupling capacitors. The adequate value of C7, C9 is 10F.
No.573-3/7
LA3161
NAB element and determination of gain Since the DC feedback is provided by R1, R2 of NAB element, which brings about DC output potential at pins 3, 6, it is impossible to change the value of R1, R2 of NAB element greatly. Therefore, when determining the gain, change RNF with R1, R2, C1 (NAB element) kept constant.
(1) How to obtain RNF Impedance Z of NAB element is Z= 1 + R2 1/R1+jC1 1+jC1 {R1R2/ (R1+R2)} = (R1+R2) { } 1+jC1R1
For a general negative feedback amplifier circuit, A=Ao/(1+Ao) applies, and Z=A * RNF is obtained under conditions of Ao>>A, A>>1 (=RNF/ (RNF+Z), Ao=open-loop gain, A=feedback gain). Therefore, we can use an approximation of RNF=Z/A. A= (VG for 1kHz) times, (Set R1, R2 at approximately 100k) Each time constant of NAB characteristic.
Tape speed
9.5cm/s 3180s 90s
4.75cm/s 1590s 120s
T1 T2
C1, R1 C1 (R1//R2)
(2) Examples of NAB Constants (a) Tape speed : 9.5cm/s. (8 tracks)
VG : RNF (VG/f=1kHz)
VG RNF 30 180 35 100 40 56 dB
(b) Tape speed : 4.75cm/s. (cassette)
VG : RNF
VG RNF 30 440 35 240 40 130 dB
(c) Flat amplifier
VG : RNF
VG RNF 30 3.2 35 1.8 40 1 dB k
No.573-4/7
LA3161
Proper cares in using IC 1. Maximum Rating If the IC is used in the vicinity of the maximum rating, even a slight variation in conditions may cause the maximum rating to be exceeded, thereby leading to a breakdown. Allow an ample margin of variation for supply voltage, etc. and use the IC in the range where the maximum rating is not exceed. 2. Short between pins If the supply voltage is applied when the space between pins is shorted, a breakdown or deterioration may occur. When installing the IC on the board or applying the supply voltage, make sure that the space between pins is not shorted with solder, etc. 3. Breakdown of IC attributable to inverted insertion If the IC is inserted inversely and operated, the IC may suffer from something unusual, thereby leading to a breakdown or deterioration of the IC. When installing the IC on the board or operating the IC, check the marked surface of IC. Proper cares to be taken for obtaining optimum operation of IC * Set DC resistance of R1, R2 of NAB element at approximately 100k. * Determine the gain by changing RNF without chaging NAB constant (Refer to Examples of NAB constant.).
No.573-5/7
LA3161
No.573-6/7
LA3161
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 guarantees of the performance, characteristics, and functions of the described products as mounted in the customer's products 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 all semiconductor products fail with some probability. It is possible that these probabilistic failures could give 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 so that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective circuits 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 or contained herein are controlled under any of applicable local export control laws and regulations, such products must not be expor ted without obtaining the expor t license from the authorities concerned in accordance with the above law. No part of this publication may be reproduced or transmitted in any form or by any means, electronic or mechanical, including photocopying and recording, or any information storage or retrieval system, or otherwise, without the prior written permission of SANYO Electric Co., Ltd. Any and all information described or contained herein are subject to change without notice due to product/technology improvement, etc. When designing equipment, refer to the "Delivery Specification" for the SANYO product that you intend to use. Information (including circuit diagrams and circuit parameters) herein is for example only ; it is not guaranteed for volume production. SANYO believes information herein is accurate and reliable, but no guarantees are made or implied regarding its use or any infringements of intellectual property rights or other rights of third parties.
This catalog provides information as of January, 2000. Specifications and information herein are subject to change without notice.
PS No.573-7/7

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