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| Ordering number:ENN870D Monolithic Linear IC LA4160 Single-Chip Tape Recorder Audio System Features * A single package contaning preamplifier, ALC circuit, power amplifier. * Preamplifier with high gain, and power amplifier with high gain and output. 1W typ. (VCC=6V, RL=4) 2.2W typ. (VCC=9V, RL=4) * Minimum number of external parts required. * Soft tone quality at the time of output saturation. * Wide range of ALC and small variation in output voltage. * Wide range of operating supply voltage. * Small shock noise at the time of supply voltage ON/OFF (With built-in prevention circuit). * Variable monitor capability due to recording amplifier consisting of preamplifier alone. Package Dimensions unit:mm 3005A-DIP14T [LA4160] 2.5 2.1 14 8 7.62 6.45 1 7 19.0 1.53 6.5 6.0 0.51min 1.88 2.54 0.5 1.3 SANYO : DIP14T 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 50x 50x 1.5mm3 Cu-coated Conditions Ratings 13 1.2 2.25 -20 to +75 -40 to +150 Unit V W W 3.5 4.26max 3.46 C C Recommended Operating Conditions at Ta = 25C Parameter Supply Voltage Load Resistance Symbol VCC RL Conditions Ratings 6 to 9 3.2 to 8 Unit V 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 12800TH (KT)/41594HK/O207TA/4015KI/8171KI, TS No.870-1/11 0.4 LA4160 Operating Characteristics at Ta = 25C, VCC=6V, f=1kHz, See specified Test Circuit Parameter Quiescent Current [Preamplifier] Voltage Gain Maximum Output Voltage Input Resistance Equivalent Input Noise Voltage ALC Input Level [Power amplifier] Voltage Gain Output Power Total Harmonic Distortion Input Resistnace Output Noise Voltage Ripple Rejection VG PO THD ri VNO Rr Rg=10k Rg=0, VR=150mV, f=100Hz 40 Closed Loop, Rf=51 VCC=6V, THD=10% VCC=7.5V, THD=10% VCC=9V, THD=10% Po=250mW 43 0.7 1.0 1.7 45 1.0 1.5 2.2 0.3 30 0.6 45 1.8 1.5 47 dB W W W % k mV dB VG VO ri VNI ALC Playback THD=1%, Playback -20 Open loop Closed loop, Playback THD=1%, Playback 0.9 21 85 40 1.2 30 1.0 -12 2.0 dB dB V k V dBm Symbol ICCO VCC=6V VCC=9V Conditions Ratings min typ 18 23 max 30 40 Unit mA mA Test Circuit Diagram Test Method Switch Item ICCO Power amplifier VG Po THD VNO VNR preamplifier VGO Vo max VNI ALC Input level SW1 - 2 2 2 - - 1 1 - 1 SW2 on off off off on on off off off off SW3 on off off off off off off off on off SW4 off off off off off off on off off off SW5 on on on on on on off on on off SW6 on on on on on on on on on off SW7 off off off off off off off off on off SW8 off off off off off off off off off on Test area - A, D D D D D A, B B C A, B Test method Test circuit current. 20log Vo/Vi (dB), where input voltage is Vi, output voltage Vo. Test output voltage at THD=10% and convet it into output. Test THD at output voltage Vo=1V. Test output noise voltage. Superpose ripple (100Hz) 150mV on supply vottage and test output ripple. 20log Vo/Vi (dB). Test output voltage at THD=1%. Convert output noise voltage at Rg=2.2k by using gain at 1kHz. Test input voltage at THD=1%. No.870-2/11 LA4160 Equivalent Circuit Block Diagram Sample Application Circuit 1 : Cassette Recorder No.870-3/11 LA4160 Sample Application Circuit 2 : Radio-Cassette Recorder Description of Application Circuit 1. Preamplifier The preamplifier circuit consists of the input differential stage (TR9, 10), level shift stage (TR13), and output stage (TR17, 18, 19). Since the output stage is of push-pull type, no remarkable drop in the output voltage occurs even at low load impedances and the output can be connected direct to the ALC circuit and meter circuit. The external DC/AC feedback resistor (Z2) can be set arbitrarily and the closed loop gain is obtained by the following equation. VG (pre) 20 log ( Z2 ) (dB) Z1 The input impedance depends on internal resistance R2 which is 30k. No.870-4/11 LA4160 Preamplifier Circuit Since the maximum output voltage for THD=1% drops at less than 600 of the composite load impedance viewed from output pin (6), it is desirable to make the composite load impedance more than 600 when using this IC. (Refer to VO max, THD - RL characteristics.) 2. ACL Circuit The ALC circuit is of Darlington configuration which consists of TR1, 2. The collector-to-emitter impedance of TR1 made variable by the DC voltage to be applied to control pin (5) and the input voltage of the preamplifier is controlled. Whe the DC voltage to be applied to pin (5) is set at approximately 1.1V, TR1, 2 are turned ON and ALC is turned ON. For the rectifier circuit, it is recommended to use the voltage doubler rectifirer which is excellent in compression ratio. For the sets of 6V VCC, it is recommended to use a germanium diode so that the ALC width can be made wider even at the time of decreased voltages. No.870-5/11 LA4160 3. Power Amplifier The power amplifier circuit consists of the differential stage (TR22, 23), predriver stage (TR41), driver stage (TR42, 44), and output stage (TR47,48). Bias resistor R36 of TR20 at the first stage is attached externally and the input impedance depends on this R36. Input pin (4) whose potential is nearly equal to the ground potential can be connected direct to the variable resistor without using an input coupling capacitor. The closed loop voltage gain is obtained by the following equation. VG (pwr)=20log R19 (R18+Rf) Since R19=20k, R18=50 are set, approximately 52dB max. is available if Rf=0 is taken. Proper Cares in Using IC 1. Printed Circuit Board For the printed circuit board layout, refer to the printed circuit pattern example in principle. It is necessary that the grounding points of the power amplifier input (variable resistor), pin (3) feedback resistor (Rf), and bias resistor (R35) should be adjacent to one another. Especially, it should be noted that if a common impedance exists in the variable resistor grounding, the distortion, residual ripple, and cross interference (leak of signal between preamplifier and power amplifier) may worsen. No.870-6/11 LA4160 2. Oscillation a) Preamplifier Since oscillation may osccur when used at a low voltage gain, a capacitor of approximately 10pF must be connected across pins (8) and (6) for phase compensation. If the capacitor connected across pins (8) and (6) has a large capacitance at a low load impedance, further oscillation may occur, and in this case the load pin must be grounded through a capacitor of approximately 0.01F (Polyester film capacitor). The input pin must be grounded through a capacitor of approximately 1000pF for the purpose of prevention of radio disturbance and oscillation. b) Power Amplifier For the oscillation preventing capacitor connected across output pin (1) and ground, it is recommended to use a polyester film capacitor which is excellent in temperature characteristic and frequency characteristic. It should be noted, however, that if such a polyester film capacitor as to have a resonance point at a high frequency is used oscillation may not be prevented. 3. Shock Noise The shock noise which occurs from the power amplifier at the time of power supply ON/OFF is reduced by means of the prevention circuit. However, when the starting time of the power amplifier is set earlier than that of the preamplifier or the power supply is turned ON immediately after turning OFF, it may happen that the shock noise of the preamplifier cannot be masked. In this case, a germanium diode is connected across pins (7) and (9), and pins (7) and (12) respectively to make the starting time as early as possible. Even if no germanium diode is connected across pins (7) and (12), the starting time can be made earlier, but the starting time can be made much earlier by using 2pcs. of germanium diode. 4. Power Supply for Radio's Built-in Capacitor Microphone Pin (13) is for the low ripple power supply. This pin cannot be used as the power supply for a block, such as radio, which requires a large amount of current. The reason for this is that if this pin is used for this purpose, the middle point of the power amplifier shifts, thereby causing the drop in output. However, this pin can be safely used as the power supply for a built-in capacitor microphne. 5. Recording Muting The recording muting at the time of recording by use of the built-in microphone is enabled by applying 1 to 5V DC voltage to feedback pin (3) of the power amplifier. (Power amplifier : Cutoff) No.870-7/11 LA4160 6. In case of using in a radio-cassette recorder, the IC and the bar antenna must be arranged sufficiently distant from each other to avoid the radiation of higher harmonic component at the time of output saturation of the power amplifier. 7. Pin-to-pin short causes breakdown and deterioration. 8. Load short causes breakdown and deterioration of both preamplifier and power amplifier. No.870-8/11 LA4160 No.870-9/11 LA4160 No.870-10/11 LA4160 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.870-11/11 |
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