Monolithic Linear LA4165M Recording/Playback Micro-Cassette

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Monolithic Linear LA4165M Recording/Playback Micro-Cassette

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Ordering number ENN2824A
Monolithic Linear
LA4165M
Recording/Playback Micro-Cassette Tape Recorder
Overview
LA4165M Recording-Playback combines functions required design recording playback systems motor control circuits micro- standard-cassette tape recorders into single chip. Functions provided include automatic audio input sensing during recording with stepless setting onoff threshold using playback volume control, indication that recording progress. Recording playback modes toggled using single control pin. LA4165M also on-chip preamp, power circuits, been designed operate with power supply. device available 24-pin plastic MFPs.
Package Dimensions
unit: 3108-MFP24D
[LA4165M]
15.3
0.25
Features
Audio input sensor circuit driver circuit Motor control circuit circuit Preamp power circuits
1.27
2.25
0.67
SANYO: MFP24D
SANYO products described contained herein have specifications that handle applications that require extremely high levels reliability, such life-support systems, aircraft's control systems, other applications whose failure reasonably expected result serious physical and/or material damage. Consult with your SANYO representative nearest before using SANYO products described contained herein such applications. SANYO assumes responsibility equipment failures that result from using products values that exceed, even momentarily, rated values (such maximum ratings, operating condition ranges, other parameters) listed products specifications SANYO products described contained herein.
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
D2599TH (OT)/12893TS/6089TA, No.2824-1/17
0.625
2.55max
10.5
LA4165M
Specifications
Maximum Ratings 25°C
Parameter Maximum Supply Voltage Allowable Power Dissipation Operating Temperature Storage Temperature Symbol Topr Tstg Power Conditions Ratings 1100 +150 Unit
Operating Conditions 25°C
Parameter Recommended Supply Voltage Operating Voltage Range Power Load Resistance Preamp Load Resistance Symbol PLAY Conditions Ratings Unit
Operating Characteristics 25°C, (Play Power), (Rec Power), (Pre), kHz, 0.775
Parameter [Pre Power] Quiescent Current Quiescent Current Voltage Gain (Closed Loop) Voltage Gain (Closed Loop) PLAY [Pre Amp] Voltage Gain (Closed Loop) Voltage Gain (Closed Loop) PLAY Maximum Output Voltage Equivalent Input Noise Voltage Input Resistance Total Harmonic Distortion [POWER AMP] Voltage Gain Output Power Total Harmonic Distortion Output Noise Voltage [ALC] Width Distortion Output Start Input Level [Voice Sensor] Minimum Activation Input Voltage Maximum Activation Input Voltage Input Hysteresis [LED Drive] Drive Current ILED -84.5 -62.5 -81.5 -59.5 -78.5 -56.5 Input voltage above cut-in voltage output rise 0.35 -66.5 0.67 0.46 0.55 -71.5 THD2 dBm, 26.0 0.05 28.5 31.0 THD1 PLAY mode, mode, dBm, PLAY mode, dBm, THD=1%, PLAY mode PLAY mode, 32.5 42.5 22.5 0.01 32.2 0.11 37.5 47.5 ICC-R ICC-P VGTR VGTP mode, PLAY mode, mode, PLAY mode, 64.5 73.5 Symbol Conditions Ratings Unit
Pre: Pre:
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2824-2/17
LA4165M
Continued from preceding page.
Parameter [Moter Control] Reference voltage Quiescent Current Shunt Ratio Residual Voltage Voltage Characteristic Reference Voltage Voltage Characteristic Shunt Ratio Current Characteristic Reference Voltage Current Characteristic Shunt Ratio Vref Vsat 50-100 Vref Vcont -0.05 1.25 0.007 +0.005 0.03 +0.05 %/mA %/mA Symbol Conditions Ratings Unit
Vref/V Vref =2.0 50-100 Vref/I Vref 50-100 150-200
Recording/Playback Mode Functions
2824-3/17
LA4165M Test Circuit
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LA4165M Equivalent Circuit
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LA4165M Block Diagram
Sample Application Circuit
2824-6/17
LA4165M Functional Description [Preamp] frequency response characteristic noise preamplifier selected record/playback select CONT (pin 20). CONT taken ground select record mode, frequency response flat. CONT left open, playback mode selected preamp response curve. [Power Amp] power amplifier suited driving speakers earphones. [ALC] (Automatic Level Control) circuit active recording mode. detects power output level, controls preamplifier input gain that power output level constant. [VOX CONT VOX] This circuit monitors power output level, turns motor drive off. When CONT circuit operating, drive output active. extinguished supply voltage drops 1.8V. [GVN] Motor control circuit. external constants determined according motor characteristics keep motor speed constant. Circuit Components function each component, together with recommended values parentheses, listed below. (2200 4700 Determines frequency response signal voltage record/replay head during recording. value should selected according characteristics head. (4700 Determines playback equalization frequency response. (2200 Suppresses high-frequency oscillation. (2200 4700 Controls high-frequency characteristics. will interact with reduce power input level large. (2200 4700 Microphone input high-frequency filter. This should selected according high-frequency cut-off value C21. (470 Couples power output speaker headphones. value adequate when using speaker headphones. Suppresses oscillation. low-temperature operation (down -10°C), 0.47 tantalum electrolytic capacitor should used. control smoothing filter. should large, since this will also increase attack time. (0.1 Voice sensor (VOX) control smoothing filter. should large, since this will also increase turn-on delay (the time motor drive circuit turn after microphone input voltage reaches level).
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2824-7/17
LA4165M
Continued from preceding page.
Voice sensor transient suppression. This prevents motor drive from being turned large transient pulses. Determines time constant motor drive hold after voice sensor circuit turns off. motor drive remains approximately seconds resistor parallel with (4.7 Together with series resistor determines preamp low-frequency cut-off. =4.7 R8=100 cut-off approximately cut-off approximately giving value respectively. (0.47 Preamp input coupling capacitor. (2200 µpF) suppression capacitor. Select this according characteristics record/play head. (3300 Microphone input high-frequency filter. (220 Reference voltage decoupling capacitor. (220 Head supply ripple filter. (220 Supply decoupling capacitor. Reference resistor (R7) bypass capacitor. Setting should performed according motor characteristics. Load (motor) bypass capacitor. Setting should performed according motor characteristics. Determines flow current through head. Select this according head characteristics level. (820 Determines microphone input level which voice sensor starts operating when minimum. Larger values give voice sensor operation lower microphone input signal levels. Improves high-frequency response reduces high-frequency distortion. Distortion above increases decreases. (100 Determines recovery time. (300 Voice sensor circuit control current resistor. form motor drive hold-time constant. Determines motor speed. Select this according motor characteristics value variable resistor VR2.
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2824-8/17
LA4165M
Continued from preceding page.
(100 Select this according motor characteristics. Preamp negative feedback resistor. (3.9 Bias resistor electrostatic microphones. current into reference voltage (pin should greater than ±1mA, biase other circuits will affected. particular, power amplifier output power will reduced. Recording head bias resistor. Since bias reference voltage filtered voltage excessive current should drawn R10, reference voltage will affected. following diagram shows internal circuit reference voltage generator.
Select this match electrostatic microphone output characteristics. Adjusts output level playback mode, voice sensor sensitivity record mode. Motor speed fine adjustment. (Red LED) Illuminated while recording. starts when drops completely extinguished when drops
2824-9/17
LA4165M
Design Notes Locate LC4165M close possible power source, prevent voltage power loss supply line resistance.
Change "Inner "Wiring resistance Change "Inner "Wiring resistance total wiring resistance causes voltage supply pins drop from source voltage power output from amplifier equal (VC)2
2824-10/17
LA4165M Keep supply lines amplifier circuits separate from those motor drive circuit. This will reduce effect motor noise amplifiers help prevent voltage drop motor load from affecting amplifier supply voltage. recommended supply layout LA4165M power supply lines shown below.
connect resistor capacitor this being charged small current determine voice sensor attack time. Bypassing this capacitor with resistor will increase attack time, possibly prevent voice sensor circuit from turning
voice sensor circuit approximately hysteresis. turns voltage approximately turns approximately 0.65 Biasing higher than 0.65 will cause remain voice sensor equivalent circuit shown below.
2824-11/17
LA4165M record mode, grounding will turn voice sensor circuit keep motor drive circuit operating continuously.
close when governor circuit close when off. voice sensor output stage equivalent circuit shown below.
used solely driving external LED, should left open when used. active only during record mode while motor drive drive circuit shown below.
2824-12/17
LA4165M
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LA4165M
2824-14/17
LA4165M
2824-15/17
LA4165M
2824-16/17
LA4165M
Specifications SANYO products described contained herein stipulate performance, characteristics, functions described products independent state, guarantees performance, characteristics, functions described products mounted customer's products equipment. verify symptoms states that cannot evaluated independent device, customer should always evaluate test devices mounted customer's products equipment. SANYO Electric Co., Ltd. strives supply high-quality high-reliability products. However, semiconductor products fail with some probability. possible that these probabilistic failures could give rise accidents events that could endanger human lives, that could give rise smoke fire, that could cause damage other property. When designing equipment, adopt safety measures that these kinds accidents events cannot occur. Such measures include limited protective circuits error prevention circuits safe design, redundant design, structural design. event that SANYO products (including technical data, services) described contained herein controlled under applicable local export control laws regulations, such products must exported without obtaining export license from authorities concerned accordance with above law. part this publication reproduced transmitted form means, electronic mechanical, including photocopying recording, information storage retrieval system, otherwise, without prior written permission SANYO Electric Co., Ltd. information described contained herein subject change without notice product/technology improvement, etc. When designing equipment, refer "Delivery Specification" SANYO product that intend use. Information (including circuit diagrams circuit parameters) herein example only; guaranteed volume production. SANYO believes information herein accurate reliable, guarantees made implied regarding infringements intellectual property rights other rights third parties.
This catalog provides information December, 1999. Specifications information herein subject change without notice. 2824-17/17

Monolithic Linear LA4165M Recording/Playback Micro-Cassette

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