Advertisement
Car Audio Electronic Volume Control IC
Car Audio Electronic Volume Control IC
Car Audio Electronic Volume Control IC
with BBE Surround Processor
with BBE Surround Processor
with BBE Surround Processor
LA2657M
LA2657M
LA2657M
Overview
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.
Functions
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)
Block Diagram
BBE
BBE
NC
64 63 62 61 60 59 58 57 56 55 54
+
1
TONE
EVR
+
2
S-BASS
F.
+
SW
3
+
4
+
5
Vreg
+
6
+
7
F.
+
8
SW
+
9
NC
10
BBE
11
BBE
12
EVR
+
13
14
TONE
S-BASS
15
NC
V ef
16
17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32
NC
+
V CC
39 Car Audio
: Use of conditional products requires
consultation with a SANYO representative
Conditional
Conditional
Conditional
Conditional
prior to the use of the device.
Product
Product
Product
Product
R
BBE and BBE symbol are registered trademarks of BBE Sound, Inc.
: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.
PA
PA
+
CE DI CL
+
NC
+
53
52 51 50 49
48
NC
CCB
FADER
INTERFACE
V DD
47
+
46
PA
FADER
+
45
PA
44
F.SW
43
42
41
BBE
40
39
NC
38
37
EVR
36
35
BBE
EVR
SW
34
BBE
33
NC
NC
NC
BBE
F.SW
on/off
Four Channel High-Output Line Amplifier
Four Channel High-Output Line Amplifier
Four Channel High-Output Line Amplifier
for Car Audio
for Car Audio
for Car Audio
LA2901V
LA2901V
LA2901V
Overview
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.
Functions and Features
High output level (5.3 V rms)
Low output noise voltage (12 V)
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)
Block Diagram
V CC
9.0V
LF-OUT
LR-OUT
100µF
10kΩ
10kΩ
22µF
22µF
1.5NF
24
23
22
21
20
19 18
1
2
3
4
5
6
24kΩ
Ripple
22µF
22µF
Filter
24kΩ
LF-IN
LR-IN
100µF
RF-OUT
RR-OUT
10µF
10kΩ
10kΩ
22µF
22µF
1.5NF
17
16
15
14
13
7
8
9
10
11
12
24kΩ
24kΩ
22µF
22µF
47µF
RR-IN
RF-IN
We recommend the use of 1% tolerance or better resistors
for the 24 k and 36 k feedback resistors.
40 Car Audio
Advertisement
