SANYO LA3242

Ordering number: EN 2620C
Monolithic Linear IC
LA3242
Preamplifier for Compact Cassette Recorder
Recording-only Use
Overview
Package Dimensions
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.
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
×2
×1
×2
×6
Specifications
Maximum Ratings at Ta = 25°C
Parameter
Maximum supply voltage
Allowable power dissipation
Symbol
Conditions
Ratings
Unit
VCC max
16
V
Pd max
720
mW
Operating temperature
Topr
–20 to +75
°C
Storage temperature
Tstg
–40 to +125
°C
Ratings
Unit
Operating Conditions at Ta = 25°C
Parameter
Recommended supply voltage
Operating voltage range
Symbol
VCC
VCC op
Conditions
6
V
4.5 to 14.0
V
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TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
D3097HA(II)/N257TA/7027TA,TS No.2620-1/12
LA3242
Operating Characteristics at Ta = 25°C, VCC = 6.0 V, RL = 10 kΩ, 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
Conditions
Me/Nor, Nor/High SW OFF
Me/Nor, Nor/High SW ON
VGO1
VG1
THD 1
VO max
VO = 0 dBm
VO = 0.4 V
THD = 1%
VNI1
Rg = 2.2 kΩ, B.P.F = 20 Hz to 20 kHz
RI1
CT1
CT2
VBL
Between REC amps
REC amp→Microphone amp
VIN = –50 dBm
VGO2
VG2
THD2
VO max
VO = 0 dBm
VO = 0.4 V
THD = 1%
VNI2
Rg = 2.2 kΩ, B.P.F = 20 Hz to 20 kHz
RI2
CT3
Microphone amp→REC amp
ALCW
ALC balance
ALC distortion
ALC output voltage
Crosstalk
Crosstalk
ALC ON-state voltage
ALC OFF-state voltage
[Switch]
ON-state resistance
DC feedback resistance
Allowable power dissipation, Pd max – mW
Symbol
ICCO
ICCS
ALCB
ALCTHD
ALCVO
CT4
CT5
ALCon
ALCoff
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 amp→Microphone amp
Voltage on pin 17
Voltage on pin 17
RON
RF1
min
5
12
typ
7.5
16
max
12
20
Unit
mA
mA
75
42.5
85
44.5
0.1
1.0
46.0
0.7
dB
dB
%
V
1.1
1.7
µV
50
60
75
0
60
kΩ
dB
dB
dB
0.7
40
50
50
60
23
2
70
25
0.05
1.1
27
0.5
dB
dB
V
V
1.1
1.7
µV
40
45
50
60
60
kΩ
dB
40
45
0.33
45
50
0
0.15
0.42
60
70
0.8
dB
2
0.8
0.53
1.0
1.5
40
30
50
70
60
dB
%
V
dB
dB
V
V
Ω
kΩ
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 = 25°C).
The ALC width depends on external resistor RA.
No.2620-4/12
LA3242
Test Circuit
Sample Printed Circuit Pattern (Cu-foiled area)
2
130 × 130 mm
Unit (resistance: Ω, capacitance: F)
No.2620-5/12
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 µF to 10 µF. 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 µF. If the value of Cr is made less than 33 µF, 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 µF)
(3) Electronic switch control circuit
The control circuit for control pins 9 and 16 is configured as
shown left.
Control
pin
Electronic
SW ON
signal
Control level VCONT of the control circuit is given by:
VCONT = 1/2 × (VCC – 0.9) [V]
. 4 µAmin
(4) Relation between control voltage to turn ON/OFF electronic switch and supply voltage (Refer to Data VCONT – VCC.)
Electronic SW OFF
Electronic SW ON
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 × (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.
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
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
Input frequency, fIN – Hz
ICCO, ICCS – VCC
VG – VCC
Voltage gain, VG – dB
Quiescent current, ICCO – mA
Quiescent current, ICCS (Electronic SW ON) – mA
CONT.)
Supply voltage, VCC – V
Supply voltage, VCC – V
No.2620-7/12
ALC output voltage, VOALC – dB
Output voltage, VO – V
Total harmonic distortion, THD – %
Output voltage, VO – V
Total harmonic distortion, THD – %
Output voltage, VO –V
Total harmonic distortion, THD – %
Output voltage, VO – V
Total harmonic distortion, THD –%
Maximum output voltage, VO max – V
Crosstalk, CT – dB
Output voltage, VO – V
Total harmonic distortion, THD – %
LA3242
VO, THD – VIN
Input voltage, VIN – dBm
CT – VCC
Input voltage, VIN – dBm
VO max – VCC
Supply voltage, VCC – V
VO, THD – VIN
Supply voltage, VCC – V
VO, THD – VIN
Input voltage, VIN – dBm
VO, THD – VIN
Input voltage, VIN – dBm
VO, THD – VIN
Pin 17
Input voltage, VIN – dBm
VOALC – VCC
Supply voltage, VCC – V
No.2620-8/12
Output noise voltage, VNO – µV
(VCC = 6 V)
Output noise voltage, VNO – µV
Supply voltage, VCC – V
VNO – Rg
Input signal source resistance, Rg – Ω
VO max – RL
Supply voltage, VCC – V
VNI – Rg
Input signal source resistance, Rg – Ω
VO max – VCC
Maximum output voltage, VO max – V
Maximum output voltage, VO max – V
VNO – VCC
VNI – VCC
Equivalent input noise voltage, VNI – µV
Equivalent input noise voltage, VNI – µV
LA3242
Supply voltage, VCC – V
VG – VCC
Voltage gain, VG – dB
Output voltage, VO – V
Total harmonic distortion, THD – %
Load resistance, RL – Ω
VO, THD – VIN
Input voltage, VIN – dBm
Supply voltage, VCC – V
No.2620-9/12
VNI – VCC
Supply voltage, VCC – V
CT – fIN
Crosstalk, CT – dB
Supply voltage, VCC – V
VNI – Rg
Input signal source resistance, Rg – Ω
CT – fIN
Input frequency, fIN – Hz
CT – fIN
Crosstalk, CT – dB
Crosstalk, CT – dB
Equivalent input noise voltage, VNI – µV
Output noise voltage, VNO – µV
VNO – VCC
Equivalent input noise voltage, VNI – µV
LA3242
Input frequency, fIN – Hz
CT – fIN
Crosstalk, CT – dB
Crosstalk, CT – dB
Input frequency, fIN – Hz
CT – fIN
Input frequency, fIN – Hz
Input frequency, fIN – Hz
No.2620-10/12
LA3242
Rr – fR
Ripple rejection ratio, Rr – dB
Ripple rejection ratio, Rr – dB
Rr – VCC
Ripple frequency, fR – Hz
ICCO – Ta
Voltage gain, VG – dB
Value of capacitor for ripple filter, Cr – µF
VG – Ta
From the top:
Maximum output voltage, VO max – V
Quiescent current, ICCO – mA
Ripple rejection ratio, Rr – dB
Supply voltage, VCC – V
Rr – Cr
Ambient temperature, Ta – °C
VO max – Ta
Maximum output voltage, VO max – V
Maximum output voltage, VO max – V
Ambient temperature, Ta – °C
VO max – Ta
Ambient temperature, Ta – °C
VO max – Ta
Ambient temperature, Ta – °C
Ambient temperature, Ta – °C
No.2620-11/12
LA3242
VCONT – VCC
Electronic SW ON
Electronic SW
ON (Make)
Thrshold region
Output voltage, VOAC – V
Residual voltage(Pin 8), V8 – V
Control voltage(pin 16), VCONT – V
Electronic SW OFF
Electronic SW
OFF (Break)
Supply voltage, VCC – V
VOAC, V8, I – VALC CONT
Ambient temperature, Ta – °C
VCONT – VCC
Control voltage VCONT on pin 16 and pin
16-controlled electronic SW ON/OFF
characteristic
Control voltage VCONT on pin 9 and pin
9-controlled electronic SW ON/OFF
characteristic
Bias current, I – µA
DC voltage, VDAC, V17 – V
Control voltage (Pin 9), VCONT – V
VDAC, V17 – Ta
Threshold region
ALC control voltage, VALC
VIN DC – VCC
CONT
–V
Input DC voltage, VIN
Starting time, ts – s
DC
– mV
Supply voltage, VCC – V
ts – Cr
Value of capacitor for ripple filter (Pin 14), Cr – µF
Supply voltage, VCC – V
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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