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LA2657M
LA2657M
LA2657M
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NC
NC
V
CC
BBE
on/off
F.SW
NC
NC
NC
NC
NCNC
NC
EVR
EVR
NC
F.SW
PA
PA
PA
PA
+
+
+
+
+
+
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V
DD
CE DI CL
53
BBE
BBE
BBE
BBE
+
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+
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+
+
+
+
+
F.
SW
F.
SW
Vreg
EVR
TONE
S-BASS
V ef
BBE
SW
BBE
BBE
CCB
INTERFACE
FADER
FADER
TONE
S-BASS
EVR
39 Car Audio 40 Car Audio
LA2901V
LA2901V
LA2901V
36kΩ
24kΩ
24kΩ
36kΩ
36kΩ
30kΩ
30kΩ
12kΩ 36kΩ
12kΩ
30kΩ
30kΩ
36kΩ
36kΩ
10kΩ
10kΩ
10kΩ
10kΩ
24kΩ
24kΩ
+
+
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
1.5NF1.5NF
+
+
+
+
+
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
--
+
--
+
--
+
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X
X
Four Channel High-Output Line Amplifier
Four Channel High-Output Line Amplifier
for Car Audio
for Car Audio
Car Audio Electronic Volume Control IC Car Audio Electronic Volume Control IC
Car Audio Electronic Volume Control IC
with BBE Surround Processorwith BBE Surround Processor
with BBE Surround Processor
Four Channel High-Output Line Amplifier
for Car Audio
Conditional
Product
Conditional
Conditional
C
on
diti
ona
l
Product
Product
P
r
oduct
: Use of conditional products requires
consultation with a SANYO representative
prior to the use of the device.
❋
OverviewOverview
Functions and Features
Functions
Block Diagram Block Diagram
:This product is subject to change without notice for improvement. When considering the use of this
product, first refer to the latest SANYO "Semiconductor News" publication related to this device and
finally refer to the latest specifications for the device.
❋
The LA2657M is an audio signal processor for car audio that integrates the functions of the LC75421 IC and a
BBE surround processing on a single chip. The LA2657M's main functions include input functions, input gain
adjustment, tone controls, super bass function, balance control, volume fader control, and the BBE surround
processor.
■ Input functions: Four input systems (L+R) (The LC75421 provides five input systems.)
■ Input gain control (0 to 18.75 dB in 1.25 dB steps)
■ BBE processor
■ Tone controls (Bass: ±11.9 dB, treble: ±11.9 dB. Both in 1.7 dB steps)
■ Super bass (0 to 20 dB in 2 dB steps)
■ Master volume control (0 dB to -79 dB in 1 dB steps, -∞)
■ Bus control
■ Fader (0 to -20 dB in 2 dB steps, -20 to -25 dB in 5 dB steps, -25 to -45 dB in 10 dB steps, -60 dB, -∞)
■ CCB bus (On/off control of the BEE function is not provided over the CCB bus.)
■ Package: QIP64E (14 14 mm)
The LA2901V is a 4-channel high-output line amplifier designed for car audio applications.
Since the output voltage is increased significantly over conventional line amplifiers, the LA2901V achieves a high
signal-to-noise ratio and high audio quality in the connection from the main unit to the external amplifier and
can improve power amplifier performance.
The LA2901V also provides significant space savings over earlier solution but reducing by one half the number
of capacitors previously required to boost the signal system supply voltage and by adopting the SSOP miniature
package.
■ High output level (5.3 V rms)
■ Low output noise voltage (12 µV)
■ Low total harmonic distortion (0.004 %)
■ High ripple rejection ratio (70 dB)
■ Minimal number of external components required
■ Superb audio quality
■ Package: SSOP24 (275 mil)
We recommend the use of 1% tolerance or better resistors
for the 24 kΩ and 36 kΩ feedback resistors.
BBE and BBE symbol are registered trademarks of BBE Sound, Inc.
R