Page 1
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.
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.
Functions
Package Dimensions
unit : mm
3067-DIP24S
[LA3242]
SANYO : DIP24S
.
Recording preamplifier ×2
.
Microphone amplifier ×1
.
ALC output ×2
.
Electronic switch ×6
Specifications
Maximum Ratings at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
Allowable power dissipation Pd max 720 mW
Operating temperature Topr –20 to +75 °C
Storage temperature Tstg –40 to +125 °C
Operating Conditions at Ta = 25°C
Parameter Symbol Conditions Ratings Unit
Recommended supply voltage V
Operating voltage range V
max 16 V
CC
CC
op 4.5 to 14.0 V
CC
6V
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
D3097HA(II)/N257TA/7027TA,TS No.2620-1/12
Page 2
LA3242
Operating Characteristics at Ta = 25°C, VCC= 6.0 V, RL=10kΩ,f=1kHz, 0 dB = 0.775 V
Parameter Symbol Conditions min typ max Unit
Quiescent current I
Quiescent current I
CCO
CCS
[REC Amp]
Voltage gain (Open) VG
Voltage gain (Closed) VG1 V
Total harmonic distortion THD 1 V
Maximum output voltage V
Equivalent input noise
voltage
Input resistance R
Crosstalk
Channel balance V
max THD = 1% 0.7 1.0 V
O
V
NI
I
CT1 Between REC amps 50 60 dB
CT2 REC amp→Microphone amp 50 75 dB
BL
[Microphone Amp]
Voltage gain (Open) VG
Voltage gain (Closed) VG2 V
Total harmonic distortion THD2 V
Maximum output voltage V
Equivalent input noise
voltage
Input resistance R
max THD = 1% 0.8 1.1 V
O
V
NI
I
Crosstalk CT3 Microphone amp→REC amp 45 60 dB
[ALC]
ALC range ALC
ALC balance ALC
ALC distortion ALC
ALC output voltage ALC
Crosstalk CT4 Between REC amps 45 60 dB
Crosstalk CT5 REC amp→Microphone amp 50 70 dB
ALC ON-state voltage ALCon Voltage on pin 17 1.0 V
ALC OFF-state voltage ALCoff Voltage on pin 17 1.5 V
[Switch]
ON-state resistance R
DC feedback resistance R
ON
F
Me/Nor, Nor/High SW OFF 5 7.5 12 mA
Me/Nor, Nor/High SW ON 12 16 20 mA
17585dB
O
= 0 dBm 42.5 44.5 46.0 dB
O
= 0.4 V 0.1 0.7 %
O
1 Rg = 2.2 kΩ, B.P.F = 20 Hz to 20 kHz 1.1 1.7 µV
1 405060kΩ
VIN= –50 dBm 0 2 dB
26070dB
O
= 0 dBm 23 25 27 dB
O
= 0.4 V 0.05 0.5 V
O
2 Rg = 2.2 kΩ, B.P.F = 20 Hz to 20 kHz 1.1 1.7 µV
2 405060kΩ
Input range when output distortion becomes 1%
W
after ALC begins to the applied.
Output difference between CH1 and CH2 0 2 dB
B
THDVIN
VO
= –40 dBm 0.15 0.8 %
VIN= –40 dBm 0.33 0.42 0.53 V
40 45 dB
30 70 Ω
1 405060kΩ
Allowable power dissipation, Pd max – mW
Pd max – Ta
Ambient temperature, Ta – °C
No.2620-2/12
Page 3
Equivalent Circuit Block Diagram
LA3242
Equivalent Circuit
Top view
No.2620-3/12
Page 4
Sample Application Circuit
LA3242
Note:
1. The electronic select switching level is approximately (V
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.
3. Z1 through Z3 may be configured with coil ‘‘L’’, capacitor ‘‘C’’, and resistor ‘‘R’’.
4. When electronic control pins 9 and 16 are at the GND level, each electronic switch is turned ON.
5. 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).
6. The ALC width depends on external resistor R
.
A
CC
– 0.9)/2.
No.2620-4/12
Page 5
Test Circuit
LA3242
Sample Printed Circuit Pattern (Cu-foiled area)
Unit (resistance: Ω, capacitance: F)
130 × 130 mm
2
No.2620-5/12
Page 6
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 V
50 mV max (V
= 20 mV typ).
INDC
with input pins 2 and 23 open is
INDC
For the relation between supply voltage VCCand V
(2) Output waveform starting time (Refer to Data t
, refer to the VCC–V
INDC
.)
s–Cr
characteristic.
INDC
Rise waveform at pin 7 or 18
When supply voltage V
is switched ON, the amplifier output (pins 7 and 18) will rise. Output waveform ON time ts can be
CC
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 V
is switched ON. (ts = 0.7 s. typ at
CC
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 V
V
= 1/2 × (VCC– 0.9) [V]
CONT
of the control circuit is given by:
CONT
. 4 µAmin
(4) Relation between control voltage to turn ON/OFF electronic switch and supply voltage (Refer to Data V
The control level at electronic switch CONT pin 9 and 16 is fixed
Electronic SW OFF
by supply voltage V
approximately 1 V. The middle point of threshold region at a
. The threshold region has a range of
CC
given value of supply voltage VCCis represented by approximately
Electronic SW ON
1/2 × (V
The electronic switch can be turned ON/OFF by applying a
CC
– 0.9) V.
voltage of the middle point voltage ±0.5 V or more/less,
respectively, to electronic switch CONT pins 9 and 16.
Threshold region (. 1V)
CONT–VCC
No.2620-6/12
.)
Page 7
(5) ALC control pin and ON/OFF level
LA3242
The ALC ON/OFF control circuit is configured as shown left.
When a voltage of (V
ALC CONT17, the potential on the ALC IN (pin 8) drops to GND
level. The ALC is turned OFF (ALC function release).
1+VBE2) = 1.5 V or greater is applied to the
BE
–dB
O
Voltage gain (Open), VG
Threshold
region
REC amplifier output V
is controlled by the ALC CONT
OAC
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.
VG
,VG–f
O
(Refer to Data V
IN
, V8, I1–V
OAC
ALC CONT
.)
VGO,VG–f
IN
–dB
O
Either Me/Nor or Nor/High On
Voltage gain (Closed), VG – dB
Voltage gain (Open), VG
Voltage gain (Closed), VG – dB
–mA
CCO
Quiescent current, I
(Electronic SW ON) – mA
CCS
Quiescent current, I
Input frequency, fIN–Hz
I
CCO,ICCS–VCC
Supply voltage, VCC–V
Input frequency, fIN–Hz
VG–V
CC
Voltage gain, VG – dB
Supply voltage, VCC–V
No.2620-7/12
Page 8
LA3242
–V
O
Output voltage, V
Total harmonic distortion, THD – %
max–V
O
,THD–V
V
O
IN
Input voltage, VIN– dBm
max–V
V
O
CC
Crosstalk, CT – dB
–V
O
CT–V
CC
Supply voltage, VCC–V
VO,THD–V
IN
Maximum output voltage, V
–V
O
Output voltage, V
–V
O
Output voltage, V
Total harmonic distortion, THD –%
Supply voltage, VCC–V
,THD–V
V
O
IN
Input voltage, VIN– dBm
VO,THD–V
IN
–V
O
Pin 17
Output voltage, V
ALC–dB
Total harmonic distortion, THD – %
Input voltage, VIN– dBm
VOALC–V
O
CC
Total harmonic distortion, THD – %
Input voltage, VIN– dBm
,THD–V
V
O
IN
Output voltage, V
Total harmonic distortion, THD – %
Input voltage, VIN– dBm
ALC output voltage, V
Supply voltage, VCC–V
No.2620-8/12
Page 9
LA3242
–µV
Equivalent input noise voltage, V
–µV
NI
NO
(VCC=6V)
V
NI–VCC
Supply voltage, VCC–V
–Rg VNI–Rg
V
NO
–µV
Output noise voltage, V
–µV
NO
NI
VNO–V
CC
Supply voltage, VCC–V
Output noise voltage, V
max–V
O
Maximum output voltage, V
–V
O
Input signal source resistance, Rg – Ω
max–R
V
O
L
Load resistance, RL– Ω
,THD–V
V
O
IN
Equivalent input noise voltage, V
max–V
O
Maximum output voltage, V
Input signal source resistance, Rg – Ω
VOmax–V
CC
Supply voltage, VCC–V
VG–V
CC
Output voltage, V
Voltage gain, VG – dB
Total harmonic distortion, THD – %
Input voltage, VIN– dBm
Supply voltage, VCC–V
No.2620-9/12
Page 10
LA3242
–µV
Output noise voltage, V
–µV
NI
NO
V
NO–VCC
Supply voltage, VCC–V
–Rg
V
NI
–µV
Equivalent input noise voltage, V
VNI–V
CC
NI
Supply voltage, VCC–V
CT–f
IN
Crosstalk, CT – dB
Equivalent input noise voltage, V
Crosstalk, CT – dB
Input signal source resistance, Rg – Ω
CT–f
IN
Crosstalk, CT – dB
Input frequency, fIN–Hz
CT–f
IN
Input frequency, fIN–Hz
CT–f
IN
Input frequency, fIN–Hz
CT–f
IN
Crosstalk, CT – dB
Input frequency, fIN–Hz
Crosstalk, CT – dB
Input frequency, fIN–Hz
No.2620-10/12
Page 11
LA3242
–dB
Ripple rejection ratio, R
–dB
R
r–VCC
–dB
r
r
Rr–f
R
Ripple rejection ratio, R
Supply voltage, VCC–V
R
r–Cr
r
–mA
CCO
Ripple frequency, fR–Hz
I
–Ta
CCO
Ripple rejection ratio, R
Voltage gain, VG – dB
max–V
O
Value of capacitor for ripple filter, Cr–µF
VG–Ta
From the top:
Ambient temperature, Ta – °C
max–Ta VOmax–Ta
V
O
Quiescent current, I
max–V
O
Maximum output voltage, V
max–V
O
Ambient temperature, Ta – °C
V
max–Ta
O
Ambient temperature, Ta – °C
Maximum output voltage, V
Ambient temperature, Ta – °C
Maximum output voltage, V
Ambient temperature, Ta – °C
No.2620-11/12
Page 12
LA3242
V
DAC,V17
–V
17
,V
DAC
DC voltage, V
Ambient temperature, Ta – °C
V
CONT–VCC
Control voltage V
16-controlled electronic SW ON/OFF
–V
characteristic
CONT
CONT
Electronic SW OFF
–Ta
on pin 16 and pin
V
CONT–VCC
Control voltage V
9-controlled electronic SW ON/OFF
–V
characteristic
CONT
CONT
Electronic SW
OFF (Break)
Control voltage (Pin 9), V
Thrshold region
Supply voltage, VCC–V
V
OAC,V8
–V
8
–V
OAC
on pin 9 and pin
Electronic SW
ON (Make)
,I–V
ALC CONT
Electronic SW ON
Output voltage, V
Threshold region
Control voltage(pin 16), V
Supply voltage, V
t
s–Cr
CC
–V
Residual voltage(Pin 8), V
ALC control voltage, V
V
IN DC–VCC
ALC CONT
–V
–mV
–s
s
IN DC
Starting time, t
Input DC voltage, V
Value of capacitor for ripple filter (Pin 14), Cr–µF
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 fullresponsibilityand indemnify and defend SANYO ELECTRICCO., LTD.,itsaffiliates,subsidiariesand
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.
Bias current,I–µA
This catalog provides information as of December, 1997. Specifications and information herein are subject to change without notice.
No.2620-12/12
Loading...