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Ordering number: EN 2620C
Monolithic Linear IC
LA3242 Preamplifier for Compact Cassette Recorder Recording-only Use
Overview
The LA3242 is a preamp IC for compact cassette recorder recording-only use. The distinctive feature of the LA3242 is that it contains mechanical switches which have been so far connected externally as peripheral parts.
Package Dimensions
unit : mm
3067-DIP24S
[LA3242]
Features
. On-chip electronic select switches permitting selection of . . . . .
normal/higher speed recording and metal(chrome)/normal tape recording mode by using the dedicated control pins. Two ALC output pins making it easy to make up a Dolby recording system. The control voltage from a microcomputer, etc. can be used to turn ON/OFF the ALC and to set the ALC control voltage to the initial value. On-chip microphone amplifier making it easy to provide microphone mixing. Wide operating voltage range (VCC = 4.5 to 14.0 V). Can be used in conjunction with playback-only preamp LA3246 to make up a double-cassette dubbing system.
SANYO : DIP24S
Functions
. Recording preamplifier . Microphone amplifier . ALC output . Electronic switch
Specifications
x2 x1 x2 x6
Maximum Ratings at Ta = 25C
Parameter Maximum supply voltage Allowable power dissipation Operating temperature Storage temperature Symbol VCC max Pd max Topr Tstg Conditions Ratings 16 720 -20 to +75 -40 to +125 Unit V mW C C
Operating Conditions at Ta = 25C
Parameter Recommended supply voltage Operating voltage range Symbol VCC VCC op Conditions Ratings 6 4.5 to 14.0 Unit V V
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D3097HA(II)/N257TA/7027TA,TS No.2620-1/12
LA3242
Operating Characteristics at Ta = 25C, VCC = 6.0 V, RL = 10 k, f = 1 kHz, 0 dB = 0.775 V
Parameter Quiescent current Quiescent current [REC Amp] Voltage gain (Open) Voltage gain (Closed) Total harmonic distortion Maximum output voltage Equivalent input noise voltage Input resistance Crosstalk Channel balance [Microphone Amp] Voltage gain (Open) Voltage gain (Closed) Total harmonic distortion Maximum output voltage Equivalent input noise voltage Input resistance Crosstalk [ALC] ALC range ALC balance ALC distortion ALC output voltage Crosstalk Crosstalk ALC ON-state voltage ALC OFF-state voltage [Switch] ON-state resistance DC feedback resistance Symbol ICCO ICCS VGO1 VG1 THD 1 VO max VNI1 RI1 CT1 CT2 VBL VGO2 VG2 THD2 VO max VNI2 RI2 CT3 Conditions Me/Nor, Nor/High SW OFF Me/Nor, Nor/High SW ON min 5 12 75 42.5 0.7 typ 7.5 16 85 44.5 0.1 1.0 1.1 40 50 50 50 60 75 0 70 25 0.05 1.1 1.1 40 45 50 60 max 12 20 Unit mA mA dB dB % V V k dB dB dB dB dB V V V k dB
VO = 0 dBm VO = 0.4 V THD = 1% Rg = 2.2 k, B.P.F = 20 Hz to 20 kHz
46.0 0.7
1.7 60
Between REC amps REC ampMicrophone amp VIN = -50 dBm
2
VO = 0 dBm VO = 0.4 V THD = 1% Rg = 2.2 k, B.P.F = 20 Hz to 20 kHz
60 23 0.8
27 0.5
1.7 60
Microphone ampREC amp Input range when output distortion becomes 1% after ALC begins to the applied. Output difference between CH1 and CH2 VIN = -40 dBm VIN = -40 dBm Between REC amps REC ampMicrophone amp Voltage on pin 17 Voltage on pin 17
ALCW ALCB ALCTHD ALCVO CT4 CT5 ALCon ALCoff RON RF1
40
45 0 0.15 0.42 60 70 2 0.8 0.53
dB dB % V dB dB V V k
0.33 45 50 1.5
1.0
40
30 50
70 60
Allowable power dissipation, Pd max - mW
Pd max - Ta
Ambient temperature, Ta - C
No.2620-2/12
LA3242
Equivalent Circuit Block Diagram
Top view
Equivalent Circuit
No.2620-3/12
LA3242
Sample Application Circuit
Note: 1. 2. 3. 4. 5. 6. The electronic select switching level is approximately (VCC - 0.9)/2. REC amplifier NF parameters Z1 through Z3 should be selected to accommodate the recording level and frequency response that will be required in metal/normal tape and normal/higher speed modes. Z1 through Z3 may be configured with coil ``L'', capacitor ``C'', and resistor ``R''. When electronic control pins 9 and 16 are at the GND level, each electronic switch is turned ON. When ALC ON/OFF control pin 17 is at 1 V or less/1.5 V or greater, the ALC is turned ON/OFF, respectively (Ta = 25C). The ALC width depends on external resistor RA.
No.2620-4/12
LA3242
Test Circuit
Sample Printed Circuit Pattern (Cu-foiled area)
130 x 130 mm Unit (resistance: , capacitance: F) No.2620-5/12
2
LA3242
IC usage Notes (1) The base of a PNP transistor is connected to input pins 2 and 23.
When a voltage is applied to input pins 2 and 23 externally, connect a capacitor to the input pins. The recommended value of capacitor C is 0.1 F to 10 F. DC voltage VINDC with input pins 2 and 23 open is 50 mV max (VINDC = 20 mV typ).
For the relation between supply voltage VCC and VINDC, refer to the VCC - VINDC characteristic. (2) Output waveform starting time (Refer to Data ts - Cr.) Rise waveform at pin 7 or 18
When supply voltage VCC is switched ON, the amplifier output (pins 7 and 18) will rise. Output waveform ON time ts can be varied by capacitor Cr connected to pin 12. The minimum value of Cr is 33 F. If the value of Cr is made less than 33 F, more pop noise will occur and the ripple rejection will worsen at the time supply voltage VCC is switched ON. (ts = 0.7 s. typ at Cr = 100 F) (3) Electronic switch control circuit The control circuit for control pins 9 and 16 is configured as shown left.
Electronic SW ON signal
Control pin . 4 Amin
Control level VCONT of the control circuit is given by: VCONT = 1/2 x (VCC - 0.9) [V]
(4) Relation between control voltage to turn ON/OFF electronic switch and supply voltage (Refer to Data VCONT - VCC.) The control level at electronic switch CONT pin 9 and 16 is fixed by supply voltage VCC. The threshold region has a range of approximately 1 V. The middle point of threshold region at a given value of supply voltage VCC is represented by approximately 1/2 x (VCC - 0.9) V. The electronic switch can be turned ON/OFF by applying a voltage of the middle point voltage 0.5 V or more/less, respectively, to electronic switch CONT pins 9 and 16.
Electronic SW OFF
Electronic SW ON
Threshold region (. 1 V)
No.2620-6/12
LA3242
(5) ALC control pin and ON/OFF level
The ALC ON/OFF control circuit is configured as shown left. When a voltage of (VBE1+VBE2) = 1.5 V or greater is applied to the ALC CONT17, the potential on the ALC IN (pin 8) drops to GND level. The ALC is turned OFF (ALC function release).
Threshold region
REC amplifier output VOAC is controlled by the ALC CONT voltage and the threshold region has a range of approximately 0.5 V. The ALC CONT voltage is set to 1.0 V or less/1.5 V or greater to turn ON/OFF the ALC, respectively. (Refer to Data VOAC, V8, I1 - VALC
CONT.)
VGO, VG - fIN Voltage gain (Open), VGO - dB Voltage gain (Closed), VG - dB Voltage gain (Open), VGO - dB Voltage gain (Closed), VG - dB
VGO, VG - fIN
Either Me/Nor or Nor/High On
Input frequency, fIN - Hz Quiescent current, ICCO - mA Quiescent current, ICCS (Electronic SW ON) - mA ICCO, ICCS - VCC
Input frequency, fIN - Hz VG - VCC
Voltage gain, VG - dB
Supply voltage, VCC - V
Supply voltage, VCC - V No.2620-7/12
Output voltage, VO - V Total harmonic distortion, THD - %
Output voltage, VO -V Total harmonic distortion, THD - %
Maximum output voltage, VO max - V
Output voltage, VO - V Total harmonic distortion, THD - %
VO, THD - VIN
Input voltage, VIN - dBm VO, THD - VIN Input voltage, VIN - dBm VO max - VCC Supply voltage, VCC - V VO, THD - VIN
Input voltage, VIN - dBm Output voltage, VO - V Total harmonic distortion, THD - % Output voltage, VO - V Total harmonic distortion, THD -% Supply voltage, VCC - V VO, THD - VIN Input voltage, VIN - dBm VO, THD - VIN
Pin 17
LA3242
ALC output voltage, VOALC - dB
Crosstalk, CT - dB
CT - VCC
Input voltage, VIN - dBm VOALC - VCC
Supply voltage, VCC - V
No.2620-8/12
LA3242
Equivalent input noise voltage, VNI - V VNI - VCC
(VCC = 6 V)
VNO - VCC Output noise voltage, VNO - V
Maximum output voltage, VO max - V
Input signal source resistance, Rg - VO max - RL Maximum output voltage, VO max - V
Equivalent input noise voltage, VNI - V
Supply voltage, VCC - V VNO - Rg Output noise voltage, VNO - V
Supply voltage, VCC - V VNI - Rg
Input signal source resistance, Rg - VO max - VCC
Load resistance, RL - VO, THD - VIN Output voltage, VO - V Total harmonic distortion, THD - %
Supply voltage, VCC - V VG - VCC
Voltage gain, VG - dB
Input voltage, VIN - dBm
Supply voltage, VCC - V No.2620-9/12
LA3242
Equivalent input noise voltage, VNI - V VNO - VCC Output noise voltage, VNO - V VNI - VCC
Equivalent input noise voltage, VNI - V
Supply voltage, VCC - V VNI - Rg
Supply voltage, VCC - V CT - fIN
Input signal source resistance, Rg - CT - fIN
Crosstalk, CT - dB
Input frequency, fIN - Hz CT - fIN
Crosstalk, CT - dB
Crosstalk, CT - dB
Input frequency, fIN - Hz CT - fIN
Input frequency, fIN - Hz CT - fIN
Crosstalk, CT - dB
Input frequency, fIN - Hz
Crosstalk, CT - dB
Input frequency, fIN - Hz No.2620-10/12
LA3242
Rr - VCC Ripple rejection ratio, Rr - dB Ripple rejection ratio, Rr - dB Rr - fR
Supply voltage, VCC - V Rr - Cr Ripple rejection ratio, Rr - dB Quiescent current, ICCO - mA
Ripple frequency, fR - Hz ICCO - Ta
From the top:
Ambient temperature, Ta - C VO max - Ta Maximum output voltage, VO max - V Maximum output voltage, VO max - V
Maximum output voltage, VO max - V
Value of capacitor for ripple filter, Cr - F VG - Ta
Ambient temperature, Ta - C VO max - Ta
Voltage gain, VG - dB
Ambient temperature, Ta - C VO max - Ta
Ambient temperature, Ta - C
Ambient temperature, Ta - C No.2620-11/12
LA3242
VDAC, V17 - Ta Control voltage (Pin 9), VCONT - V VCONT - VCC
Control voltage VCONT on pin 9 and pin 9-controlled electronic SW ON/OFF characteristic
DC voltage, VDAC, V17 - V
Electronic SW OFF (Break) Electronic SW ON (Make)
Thrshold region Supply voltage, VCC - V VOAC, V8, I - VALC CONT
Ambient temperature, Ta - C VCONT - VCC Control voltage(pin 16), VCONT - V Output voltage, VOAC - V Residual voltage(Pin 8), V8 - V
Control voltage VCONT on pin 16 and pin 16-controlled electronic SW ON/OFF characteristic
Electronic SW OFF
Electronic SW ON
Threshold region Supply voltage, VCC - V ts - Cr - mV ALC control voltage, VALC VIN DC - VCC
CONT
-V
Starting time, ts - s
Input DC voltage, VIN
DC
Value of capacitor for ripple filter (Pin 14), Cr - F
Supply voltage, VCC - V
No products described or contained herein are intended for use in surgical implants, life-support systems, aerospace equipment, nuclear power control systems, vehicles, disaster/crime-prevention equipment and the like, the failure of which may directly or indirectly cause injury, death or property loss. Anyone purchasing any products described or contained herein for an above-mentioned use shall: 1 Accept full responsibility and indemnify and defend SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors and all their officers and employees, jointly and severally, against any and all claims and litigation and all damages, cost and expenses associated with such use: 2 Not impose any responsibility for any fault or negligence which may be cited in any such claim or litigation on SANYO ELECTRIC CO., LTD., its affiliates, subsidiaries and distributors or any of their officers and employees jointly or severally. 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 December, 1997. Specifications and information herein are subject to change without notice. No.2620-12/12
Bias current, I - A

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