Monolithic Linear IC
Ordering number : EN4530A
53096HA (OT) No. 4530-1/13
SANYO Electric Co.,Ltd. Semiconductor Bussiness Headquarters
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110 JAPAN
1.5 V Record Preamplifier
LA3235W
Overview
The LA3235W is a single-chip record system IC for use in
1.5 V headphone stereo products. While previous
recording systems were implemented using a dedicated
tape drive, by using the LA3235W, such a system can be
implemented by adding electronic switching to a
playback-only tape drive. Additionally, a compact
record/playback system can be implemented with just two
chips by combining this IC and the LA4590W 1.5 V
preamplifier/power amplifier IC
Functions
Microphone amplifier (with ALC)
2
Microphone monitor amplifier
2
Radio amplifier (with ALC)
2
Record bias power supply
Record amplifier
4 (with forward/reverse switching
and muting functions)
Microphone power supply
All control circuits, including electronic switching
circuits, built in
Features
Miniature package (48-pin SQFP)
Built-in microphone and record bias power supplies
Built-in radio amplifier with ALC circuit
Systems can be easily controlled from a microprocessor
using the built-in electronic switching, power supply,
and amplifier block control circuits.
Package Dimensions
unit: mm
6134A-SQFP48
SANYO: SQFP48
[LA3235W]
Specifications
Absolute Maximum Ratings
at Ta = 25C
Operating Conditions
at Ta = 25C
Operating Characteristics
at Ta = 25C, V
CC
1 and V
CCRF
= 1.2 V, V
CC
2 = 2.4 V, f = 1 kHz, 0 dBm = 0.775 V,
R
LMIC
= 10 k
, R
LRadio
= 10 k
, R
LMON
= 10 k
, R
LREC
= 3 k
No. 4530-2/13
LA3235W
Parameter
Symbol
Conditions
Ratings
Unit
Maximum supply voltage
V
CC
max
4.5
V
Allowable power dissipation
Pd max
320
mW
Operating temperature
Topr
10 to +65
C
Storage temperature
Tstg
40 to +125
C
Parameter
Symbol
Conditions
Ratings
Unit
Recommended supply voltage
V
CC
1, V
CCRF
1.5
V
V
CC
2
2.4
V
Operating supply voltage range
V
CC
1, V
CCRF
0.9 to 2.2
V
V
CC
2
2.0 to 4.0
V
Parameter
Symbol
Conditions
min
typ
max
Unit
No signal supply current: record/V
CC
1
I
CCR1
Microphone Rg = 6.8 k
0.08
0.13
0.23
mA
No signal supply current: record/V
CCRF
I
CCRR
Microphone Rg = 6.8 k
2.0
3.5
5.0
mA
No signal supply current: record/V
CC
2
I
CCR2
Microphone Rg = 6.8 k
0.85
1.5
2.1
mA
No signal supply current: playback/V
CC
1
I
CCP1
0.1
5.0
A
No signal supply current: playback/V
CCRF
I
CCPR
0.36
0.6
1.0
mA
No signal supply current: playback/V
CC
2
I
CCP2
0.3
0.5
0.75
mA
[Microphone amplifier] (measured with ALC off)
Voltage gain (closed)
VG
M
V
O
= 20 dBm
35
dB
Maximum output voltage
V
O maxM
THD = 1%
320
mV
Total harmonic distortion
THD
M
V
O
= 200 mV
0.1
%
Output noise voltage
V
NOM
Rg = 6.8 k
, BPF = 20 Hz to 20 kHz
130
V
Crosstalk (interchannel)
CT
M
V
O
= 20 dBm, TUNE 1 KHz
46
dB
Ripple rejection ratio
SVRR
M
Rg = 6.8 k
, f
R
= 100 Hz, V
R
= 30 dBm
37
dB
[Radio Amplifier] (measured with ALC off)
Voltage gain (closed)
VG
R
V
O
= 20 dBm
14.5
dB
Maximum output voltage
V
O maxR
THD = 1%
320
mV
Total harmonic distortion
THD
R
V
O
= 200 mV
0.1
%
Output noise voltage
V
NOR
Rg = 6.8 k
, BPF = 20 Hz to 20 kHz
30
V
Crosstalk (interchannel)
CT
R
V
O
= 20 dBm, TUNE 1 KHz
59
dB
Ripple rejection ratio
SVRR
R
Rg = 6.8 k
, f
R
= 100 Hz, V
R
= 30 dBm
55
dB
[Monitor Amplifier]
Voltage gain (closed)
VG
MON
V
O
= 20 dBm
9.5
dB
Maximum output voltage
V
OMON
THD = 1%
260
mV
Total harmonic distortion
THD
MON
V
O
= 100 mV
0.1
%
Output noise voltage
V
NOMON
BPF = 20 Hz to 20 kHz
11
V
Crosstalk (interchannel)
CT
MON
V
O
= 20 dBm
59
dB
Ripple rejection ratio
SVRR
MON
f
R
= 100 Hz, V
R
= 30 dBm
57
dB
[Record Amplifier]
Voltage gain (closed)
VG
REC
V
O
= 10 dBm
22
dB
Maximum output voltage
V
OREC
THD = 1%
670
mV
Total harmonic distortion
THD
REC
V
O
= 300 mV
0.08
%
Output noise voltage
V
NOREC
BPF = 20 Hz to 20 kHz
46
V
Crosstalk (interchannel)
CT
REC
V
O
= 10 dBm
55
dB
Ripple rejection ratio
SVRR
REC
f
R
= 100 Hz, V
R
= 30 dBm
55
dB
Continued on next page.
Continued form preceding page.
No. 4530-3/13
LA3235W
Parameter
Symbol
Conditions
min
typ
max
Unit
[Microphone + Record]
Voltage gain (closed)
VG
MR
V
O
= 10 dBm, ALC OFF
52
56.6
60
dB
Maximum output voltage
V
OMR
THD = 3%
500
700
mV
Total harmonic distortion
THD
MR
Vi = 40 dBm
0.55
1.3
%
ALC voltage
ALCV
MR
Vi = 40 dBm, Rg = 6.8 k
300
400
500
mV
ALC balance
ALCB
MR
Vi = 40 dBm, Rg = 6.8 k
0
1.5
dB
ALC start input
ALCI
MR
65.5
62.5
59.5
dBm
ALC width
ALCW
MR
Input level relative to the ALC start point such
35
42
dB
that the output is +3 dB.
Output noise voltage
V
NOMR
Rg = 6.8 k
, BPF = 20 Hz to 20 kHz
1.5
2.8
mV
Crosstalk (interchannel)
CT
MR
Vi = 40 dBm
11
19
dB
SVRR
MR1
Rg = 6.8 k
, f
R
= 100 Hz, V
R
= 30 dBm
10
16
dB
Ripple rejection ratio
SVRR
MR2
Rg = 6.8 k
, f
R
= 100 Hz, V
R
= 20 dBm
50
58
dB
With ripple added to V
CC
2, TUNE = 100 Hz
[Radio + Record]
Voltage gain
VG
RR
V
O
= 10 dBm, ALC OFF
31.5
35.5
39.5
dB
Maximum output voltage
V
ORR
THD = 3%
470
570
mV
Total harmonic distortion
THD
RR
Vi = 30 dBm
0.55
1.3
%
ALC voltage
ALCV
RR
Vi = 30 dBm, Rg = 6.8 k
300
410
500
mV
ALC balance
ALCB
RR
Vi = 30 dBm, Rg = 6.8 k
0
1.5
dB
ALC start input
ALCI
RR
45.5
42.5
39.5
dBm
ALC width
ALCW
RR
Input level relative to the ALC
35
40
dB
start point such that the output is +3 dB.
Output noise voltage
V
NORR
Rg = 6.8 k
, BPF = 20 Hz to 20 kHz
340
610
V
Crosstalk (interchannel)
CT
RR
Vi = 30 dBm
35
47
dB
Ripple rejection ratio
SVRR
RR
Rg = 6.8 k
, f
R
= 100 Hz, V
R
= 30 dBm
25
32
dB
[Microphone + Monitor]
Voltage gain (closed)
VG
MMON
V
O
= 20 dBm, ALC OFF
39.5
43.5
47.5
dB
Maximum output voltage
V
OMMON
THD = 3%
150
310
mV
Total harmonic distortion
THD
MMON
Vi = 40 dBm
0.55
1.3
%
ALC voltage
ALCV
MMON
Vi = 40 dB, Rg = 6.8 k
60
90
135
mV
Output noise voltage
V
NOMMON
Rg = 6.8 k
, BPF = 20 Hz to 20 kHz
350
650
V
Crosstalk (interchannel)
CT
MMON
Vi = 40 dBm
11
19
dB
SVRR
MMON
Rg = 6.8 k
, f
R
= 100 Hz, V
R
= 30 dBm
21
27
dB
Ripple rejection ratio
SVRR
MMON
Rg = 6.8 k
, f
R
= 100 Hz, V
R
= 20 dBm
60
70
dB
With ripple added to V
CC
2, TUNE = 100 Hz
[Record Bias Power Supply]
Output voltage
V
RBR1
I
RBR
= 50 mA
0.92
1.0
1.08
V
Ripple rejection ratio
SVRR
RBR1
f
R
= 100 Hz, V
R
= 30 mA
45
53
dB
I
RBR
= 50 mA, 2SB1295; using 6 ranks
Output voltage
V
RBR2
V
CC
1 = 1.0 V, I
RBR
= 30 mA
0.89
0.93
V
Ripple rejection ratio
SVRR
RBR2
V
CC
1 = 1.0 V, f
R
= 100 Hz, V
R
= 30 dBm
33
40
dB
I
RBR
= 30 mA, 2SB1295; using 6 ranks
[Microphone Power Supply]
Output voltage
V
MR
I
MR
= 3 mA
1.55
1.65
1.75
V
Ripple rejection ratio
SVRR
MR
f
R
= 100 Hz, V
R
= 20 dBm
55
70
dB
I
MR
= 3 mA, with ripple added to V
CC
2
[Switching Control]: Record mode
Forward: CONT A and C pins: source
I
FA
, I
FC
Measured with R
L
= 10 k
20
35
A
Forward: CONT B pin sink
V
FB
I
IN
= 100 A
64
150
mV
Forward: CONT D pin sink
V
FD
I
IN
= 500 A
110
230
mV
Reverse: CONT B and D pins source
I
RB
, I
RD
Measured with R
L
= 10 k
20
35
A
Reverse: CONT A pin sink
V
RA
I
IN
= 100 A
64
150
mV
Reverse: CONT C pin sink
V
RC
I
IN
= 500 A
110
230
mV
CONT E pin sink
V
E
I
IN
= 100 A
30
70
mV
Continued on next page.
Continued form preceding page.
Switching Control Block: Operating Mode Table
Note: 1. The high-level voltage for A, B, C, D, and E is close to the V
CC
2 voltage.
2. The high-level voltage for F is close to the V
CCRF
voltage.
No. 4530-4/13
LA3235W
Parameter
Symbol
Conditions
min
typ
max
Unit
[Switching Control]: Playback mode
CONT C and D pins source
I
PC
, I
PD
Measured with R
L
= 10 k
20
35
A
CONT E pin source
I
E
Measured with R
L
= 10 k
10
18
A
CONT A and B pins sink
V
PA,
V
PB
I
IN
= 100 A
64
150
mV
Radio CONT F pin sink
V
RF
I
IN
= 100 A
64
150
mV
Microphone CONT F pin
V
MF
Vi = 40 dBm, Rg = 6.8 k
1.1
1.2
V
Item
A
*
1
B
*
1
C
*
1
D
*
1
E
*
1
F
*
2
REC/MIC/RADIO
FWD
H
L
H
L
L
L
REV
L
H
L
H
L
L
PLAY
MIC
L
L
H
H
H
H
RADIO
L
L
H
H
H
L
Block Diagram
No. 4530-5/13
LA3235W
Test Circuit Diagram
No. 4530-6/13
LA3235W
Application Circuit Example 1
No. 4530-7/13
LA3235W
Application Circuit Example 2: Circuit using the LA4590W
No. 4530-8/13
LA3235W
No. 4530-9/13
LA3235W
Pin Functions
: The indicated pin voltages are for V
CC
1 and RF = 1.2 V and V
CC
2 = 2.4 V.
Pin No.
Pin
Pin voltage (V)
Internal equivalent circuit
Notes
2
MIC REGULATOR
REF
1.4
Microphone power supply reference bias
low-pass filter connection
3
MIC REGULATOR
1.65
Microphone power supply output
Always on in record mode
4
REC BIAS
REGULATOR REF
1.0
Record bias power supply reference bias
low-pass filter connection
The value of the capacitor connected to this
pin determines the SVRR.
5
REC BIAS
REGULATOR
1.0
Record bias power supply output
Always on in record mode
6
OSC
0.5
Oscillation suppression capacitor
connection
Continued on next page.
No. 4530-10/13
LA3235W
Continued form preceding page.
Pin No.
Pin
Pin voltage (V)
Internal equivalent circuit
Notes
7
BASE
0.55
External pnp transistor base drive
connection
10
ALC
0.7
Microphone and radio ALC rectifier
connection
The external resistor and capacitor
connected to this pin determine the ALC
attack and recovery times.
14
15
REC IN2
REC IN1
0.8
Record amplifier and microphone monitor
amplifier inputs
A buzz reduction capacitor is incorporated
in these pin circuits.
The input resistance is 10 k
.
16
17
MIC OUT1
IMC OUT2
0.8
Microphone and radio amplifier outputs
18
21
RADIO IN2
RADIO IN1
0.8
Radio amplifier inputs
The input resistance is variable over the
range 6.8 to 36.8 k
.
Continued on next page.
No. 4530-11/13
LA3235W
Continued form preceding page.
Pin No.
Pin
Pin voltage (V)
Internal equivalent circuit
Notes
19
22
NF2
NF1
0.8
Microphone and radio amplifier noise filter
connections
20
23
MIC IN2
MIC IN1
0.8
Microphone amplifier inputs
The input resistance is variable over the
range 6.8 to 36.8 k
.
26
27
28
CONT E
CONT D
CONT C
V
CC
2 to 0
Fixed-current pull-up current sources
Pin 26......................18 A
Pins 27 and 28........35 A
29
30
CONT B
CONT A
V
CC
2 to 0
35-A fixed-current pull-up current sources
31
CONT F
V
CC
RF to 0
The pull-up resistor has a value of 100 k
20%.
Continued on next page.
No. 4530-12/13
LA3235W
Continued form preceding page.
Pin No.
Pin
Pin voltage (V)
Internal equivalent circuit
Notes
32
REC/PLAY SW
V
CC
RF to 0
Sets the system to record mode when
pulled down and to playback mode when
open.
Record mode condition: V32
0.1 V
33
FWD/REV SW
0.7 to 0
Output source current I
33
4 A
Sets the system to reverse mode when
pulled down.
Reverse mode condition: V33
0.4 V
34
MIC/RADIO SW
0.7 to 0
Output source current I
34
8 A
Sets the system to radio mode when pulled
down.
Radio mode condition: V34
0.4 V
35
REC MUTE SW
V
CC
RF to 0
Output source current I
35
13 A
Sets the system to muted mode when
pulled down.
Muted mode condition: V35
0.1 V
38
REF
0.8
V
REF
amplifier reference bias low-pass
filter connection
Continued on next page.
No. 4530-13/13
LA3235W
Continued form preceding page.
Pin No.
Pin
Pin voltage (V)
Internal equivalent circuit
Notes
39
V
REF
0.8
V
REF
amplifier output
Virtual ground bias for all amplifier blocks
The V
REF
amplifier makes this a low-
impedance circuit.
41
42
43
44
REC1 REV
REC2 REV
REC2 FWD
REC1 FWD
1.0
Record amplifier outputs
The output impedance in playback mode is
195 k
20%.
46
47
MIC MONITOR 1
MIC MONITOR 2
0.8
Microphone monitor amplifier output
This catalog provides information as of May, 1996. Specifications and information herein are subject to change
without notice.
s
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.
s
Anyone purchasing any products described or contained herein for an above-mentioned use shall:
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:
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.
s
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.
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