PT2312E
Stereo Audio Processor for Car Audio
Tel: 886-2-66296288
‧
Fax: 886-2-29174598
‧
http://www.princeton.com.tw
‧
2F, No.233-1, Baociao Rd., Sindian Dist., New Taipei City 23145, Taiwan
DESCRIPTION
The PT2312E is an audio processor designed for
versatile application, includes 4 stereo input selector with
adjustable gain, master volume control with low
frequency loudness compensation, individual output
attenuator and tone control. It is a good solution for the
car audio signal processing.
Due to the high reliability requirement from the audio
business, the PT2312E improves both audio
performances and input surge current capability, these
causes the PT2312E is the best solution for the
cost-effective audio systems.
APPLICATIONS
ï‚· Car Audio
ï‚· Home Audio System
ï‚· Powered Speaker System
FEATURES
ï‚· 4 stereo inputs with gain selection, range from 0dB
to +11.25dB in 3.75dB/step
ï‚· Master volume from 0 dB to -78.75dB in
1.25dB/step
ï‚· Speaker attenuator for balance and fader, range
from 0dB to -38.75dB in 1.25dB/step
ï‚· Each channel output can be muted individually.
ï‚· Low frequency loudness compensation
ï‚· Bass and Treble control, range from -14dB to
+14dB in 2dB/step
ï‚· Wide operation range (VDD=4V to 10V)
ï‚· Improved and replace PT2312 and PT2312A
APPLICATION CIRCUIT
2.2uF
2.2uF
22uF
VDD
2.7n
2.7n
100n
100n
100n
100n
100n
100n
5.6K
5.6K
Front Left
Front Right
Rear Left
Rear Right
10uF
10uF
10uF
10uF
Power
Amplifier
2.2uF
2.2uF
2.2uF
2.2uF
2.2uF
2.2uF
AUDIO 1
AUDIO 2
AUDIO 3
2.2K
2.2K
2.2K
2.2K
2.2K
2.2K
L
L
L
R
R
R
Input Surge
Protection
MCU
PT2312E
2.2uF
2.2uF
AUDIO 4
2.2K
2.2K
L
R
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16 17
18
19
20
21
22
23
24
25
26
27
28
30
29
31
32
LIN3
LIN2
LIN1
LIN
LOUT
BOUT_L
BIN_L
BIN_R
BOUT_R
RROUT
LROUT
RFOUT
LFOUT
DGND
SDA
SCLREF
VDD
AGND
TREB_L
TREB_R
RIN
ROUT
LOUD_R
RIN3
RIN2
RIN1
LOUD_L
NC
NC
RIN4
LIN4
PT2312E
V1.0
2
January 2010
BLOCK DIAGRAM
LIN4
LIN3
LIN2
LIN1
REF
LOUDNESS
LIN
LOUD_L
REF
BOUT_L
BIN_L
TREB_L TREBLE
BASS
LFOUT
LROUT
REF
REF REF
REF
LOUDNESS
REF
TREBLE
BASS
RROUT
RFOUT
TREB_R
BOUT_R
LOUD_R
RIN
RIN1
RIN2
RIN3
RIN4
REF
VDD
REF
AGND
REF
SCL
SDA
DGND
I2C
DECODER
BIAS
BIN_R
LOUT
ROUT
Speaker Attenuator
With Mute
Master
Volume
Input SW and
GAIN
INT
Ref
Loud
SW