Page 1
Ordering number : ENN7140
O3001TN (OT) No. 7140-1/5
Overview
The LA2902V is a high output level 4-channel line
amplifier designed for car audio systems. This line
amplifier provides an output signal with a significantly
higher amplitude than the output signal provided by earlier
preamplifiers. This higher amplitude significantly
improves the signal-to-noise ratio in the connection from
the main unit to the external power amplifier, and results
in improved power amplifier performance.
The LA2902V also significantly reduces the required
mounting area by cutting in half the number of external
capacitors required for boosting the signal-system supply
voltage and is available in SSOP miniature package.
Functions and Features
• High output level (5.3 Vrms)
• Low output noise voltage (17 µV)
• Low total harmonic distortion (0.004%)
• High ripple rejection ratio (65 dB)
• Fewer external parts required
• Excellent audio fidelity
Package Dimensions
unit: mm
3175B-SSOP24 (275 mil)
1
7.6
7.8
0.5
5.6
0.1
1.5max
24
0.65
0.22
(0.33)
0.15
(1.3)
SANYO: SSOP24 (275 mil)
[LA2902V]
LA2902V
SANYO Electric Co.,Ltd. Semiconductor Company
TOKYO OFFICE Tokyo Bldg., 1-10, 1 Chome, Ueno, Taito-ku, TOKYO, 110-8534 JAPAN
Four-Channel High-Output Line Amplifier
for Car Audio Systems
Monolithic Linear IC
Any and all SANYO products described or contained herein do not have specifications that can handle
applications that require extremely high levels of reliability, such as life-support systems, aircraft’s
control systems, or other applications whose failure can be reasonably expected to result in serious
physical and/or material damage. Consult with your SANYO representative nearest you before using
any SANYO products described or contained herein in such applications.
SANYO assumes no responsibility for equipment failures that result from using products at values that
exceed, even momentarily, rated values (such as maximum ratings, operating condition ranges, or other
parameters) listed in products specifications of any and all SANYO products described or contained
herein.
Parameter Symbol Conditions Ratings Unit
Maximum supply voltage V
CC
max With no input signal 13 V
Allowable power dissipation Pd max
Ta ≤ 85°C, Mounted on a printed circuit board
400 mW
(114.3 × 76.1 × 1.6 mm3, glass epoxy)
Operating temperature Topr –40 to +85 °C
Storage temperature Tstg –40 to +150 °C
Specifications
Maximum Ratings at Ta = 25°C
Page 2
No. 7140-2/5
LA2902V
Parameter Symbol Conditions
Ratings
Unit
min typ max
Quiescent current I
CCO
Rg = 0 10 16 22 mA
Voltage gain V
G
VO= 0 dBm 11.5 12 12.5 dB
Output voltage V
O
THD = 0.1% 5.0 5.3 Vrms
Total harmonic distortion THD V
O
= 3 Vrms, LPF = 80 kHz 0.004 0.01 %
Output noise voltage V
NO
Rg = 0, BPF = 20 Hz to 20 kHz 17 24 µVrms
Ripple rejection ratio SVRR
Rg = 0, fr = 100 Hz, Vr = 100 mVrms,
55 65 dB
BPF = 20 Hz to 20 kHz
Channel separation CH
sep
Rg = 10 kΩ, VO= 1 Vrms 60 70 dB
Input resistance Ri 21 30 39 kΩ
Electrical Characteristics at Ta = 25°C, VCC= 9 V, RL = 10 kΩ, f = 1 kHz, Rg = 600Ω
Parameter Symbol Conditions Ratings Unit
Recommended operating voltage V
CC
9 V
Allowable operating supply voltage range V
CCOP
6 to 12 V
Recommended load resistance RL
OP
10 kΩ
Recommended Operating Conditions at Ta = 25°C
Pin Assignment
10 11 12
15 14 13
9
16
8
17
7
18
6
19
5
20
4
21
3
22
2
23
1
24
ILA00938
LF IN+
N.C
LF IN--
LR IN--
LR IN+
DC L
DC R
RF IN+
RF IN--
N.C
RR IN+
RR IN--
LR OUT
LF OUT
L GND
LIFT L VD
LIFT L OUT
V
CC
L
V
CC
R
LIFT R OUT
LIFT R VD
R GND
RF OUT
RR OUT
Top view
LA2902V
Page 3
No. 7140-3/5
LA2902V
Sample Application Circuit and Block Diagram
36kΩ
12kΩ
12kΩ
36kΩ
36kΩ
30kΩ
30kΩ
7.5kΩ 36kΩ
7.5kΩ
30kΩ
30kΩ
36kΩ
36kΩ
10kΩ 10kΩ 10kΩ 10kΩ
12kΩ
12kΩ
+
+
22µF
22µF
47µF
LF-IN
LR-IN
Ripple
Filter
+
22µF
22µF
RF-IN
+
22µF
RR-IN
+
DC-R
DC-L
--
-+
--
+
-+
+
--
+
--
+
--
+
--
+
--
+
+
22µF
100µF
10µF
100µF
22µF
1.5NF 1.5NF
+
+
+
+
+
22µF
+
LF-OUT
LR-OUT
RF-OUT
RR-OUT
V
CC
9.0V
V
REF
V
REF
V
REF
V
REF
V
REF
V
REF
V
CC
V
CC
V
CC
V
CC
SIGNAL
AMP
SIGNAL
AMP
LIFT
AMP
LIFT
AMP
SIGNAL
AMP
SIGNAL
AMP
--
+
-+
-+
ILA00937
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
X
X
Note: We recommend using resistors with tolerances of 1% or better for the 12 kΩ and 36 kΩ feedback resistors.
Page 4
No. 7140-4/5
LA2902V
2 4 6 8 10 12 14
0
10
15
20
25
5
0
10
15
20
25
5
ILA00939
ILA00941
ILA00943
ILA00940
ILA00942
ILA00944
RL=10kΩ
Rg=0
6 7 8 9 10 11 12
2
4
5
6
3
8
7
VO -- V
CC
0 1 2 3 4 5 6
0.001
0.01
0.1
1.0
2
3
5
7
2
3
5
7
2
3
5
7
f Response -- f
VNO -- Rg
10
2 3 5 7 2 3 5 7
1k 10k100
2 3 5 7 2 3 5 7
100k
--2
--1
0
1
2
0
10
20
30
40
VNO -- V
CC
I
CCO,
VN -- V
CC
THD -- V
O
6 7 8 9 10 11 12
10
32 5 7
100
2 3 5 71k2 3 5
10k
7 2 3 5 7
100k
0
10
20
30
40
VCC=9V
RL=10kΩ
DIN AUDIO
Rg=0
RL=10kΩ
DIN AUDIO
VCC=9V
RL=10kΩ
VO=0dBm
Rg=600Ω
VCC=9V
RL=10kΩ
Rg=600Ω
L.P.F=80kHz
RL=10kΩ
f=1kHz
THD=0.1%
Rg=600Ω
L.P.F=80kHz
I
CCO
V
N
10kHz
1kHz
100Hz
0 200 400 600 800 1000
--100
--80
--60
--40
--20
ILA00945 ILA00946
VCC=9V
RL=10kΩ
fr=1kHz
Rg=0
DIN AUDIO
10
7532 2
100
753 2 753
1k 10k
2
--100
--60
--40
--80
--20
SVRR -- f
r
SVRR -- VCCR
VCC=9V
RL=10kΩ
VCCR=100mVrms
Rg=0
DIN AUDIO
Supply voltage, VCC— V
Quiescent current, I
CCO
— mA
Output voltage, V
O
— Vrms
Total harmonic distortion, THD — %
Response — dB
Supply voltage, VCC— V
Output voltage, V
O
— Vrms
Input frequency, f — Hz
Supply voltage, V
CC
— V
Input resistance, Rg — Ω
Ripple frequency, f
r
— Hz
Power supply ripple voltage, VCCR — mVrms
Output noise voltage, V
NO
— µVrms
Ripple rejection ratio, SVRR — dB
Output noise voltage, V
NO
— µVrms
Ripple rejection ratio, SVRR — dB
Output pin voltage, V
N
— V
Page 5
PS No. 7140-5/5
LA2902V
This catalog provides information as of October, 2001. Specifications and information herein are subject
to change without notice.
Specifications of any and all SANYO products described or contained herein stipulate the performance,
characteristics, and functions of the described products in the independent state, and are not guarantees
of the performance, characteristics, and functions of the described products as mounted in the customer’s
products or equipment. To verify symptoms and states that cannot be evaluated in an independent device,
the customer should always evaluate and test devices mounted in the customer’s products or equipment.
SANYO Electric Co., Ltd. strives to supply high-quality high-reliability products. However, any and all
semiconductor products fail with some probability. It is possible that these probabilistic failures could
give rise to accidents or events that could endanger human lives, that could give rise to smoke or fire,
or that could cause damage to other property. When designing equipment, adopt safety measures so
that these kinds of accidents or events cannot occur. Such measures include but are not limited to protective
circuits and error prevention circuits for safe design, redundant design, and structural design.
In the event that any or all SANYO products (including technical data, services) described or contained
herein are controlled under any of applicable local export control laws and regulations, such products must
not be exported without obtaining the export license from the authorities concerned in accordance with the
above law.
No part of this publication may be reproduced or transmitted in any form or by any means, electronic or
mechanical, including photocopying and recording, or any information storage or retrieval system,
or otherwise, without the prior written permission of SANYO Electric Co., Ltd.
Any and all information described or contained herein are subject to change without notice due to
product/technology improvement, etc. When designing equipment, refer to the “Delivery Specification”
for the SANYO product that you intend to use.
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.
Input frequency, f — Hz
Input frequency, f — Hz
Input frequency, f — Hz
Input frequency, f — Hz
Channel separation, CH sep — dB
Channel separation, CH sep — dB
Channel separation, CH sep — dB
Channel separation, CH sep — dB
--20
VCC=9V
CH Sep -- f
RL=10kΩ
LR=1Vrms
Rg=10kΩ
--40
--60
--80
--100
--20
10
VCC=9V
32 5 7
2 3 5 71k2 3 5 7 2 3 5 7
100
CH Sep -- f
RL=10kΩ
RR=1Vrms
Rg=10kΩ
--40
--60
--80
LF
Rch
10k 100k
RF
Lch
ILA00947
--20
VCC=9V
CH Sep -- f
RL=10kΩ
LF=1Vrms
Rg=10kΩ
--40
--60
--80
--100
--20
10
VCC=9V
32 5 7
2 3 5 71k2 3 5 7 2 3 5 7
100
CH Sep -- f
RL=10kΩ
RF=1Vrms
Rg=10kΩ
--40
--60
--80
LR
Rch
10k 100k
RR
Lch
ILA00948
--100
32 5 7
10
2 3 5 71k2 3 5 7 2 3 5 7
100
10k 100k
ILA00949
--100
32 5 7
10
2 3 5 71k2 3 5 7 2 3 5 7
100
10k 100k
ILA00950
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