PTC PT12311-S

Preliminary
PT12311
Stereo Audio Processor for Car Audio
DESCRIPTION
FEATURES
The PT12311 is an audio processor designed for
versatile application, includes 3 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.
• 3 stereo inputs with gain selection, range from 0dB
to +11.25dB in 3.75dB/step
• Master volume from 0 dB to -78.75dB in
1.25dB/step
• Speaker attenuator for balance and fader, range
from 0dB to -38.75dB in 1.25dB/step
• Each channel output can be muted individually.
• Low frequency loudness compensation
• Bass and Treble control, range from -14dB to
+14dB in 2dB/step
• Wide operation range (VDD = 5V to 10V)
• Low harmonic distortion, low noise
Due to the high reliability requirement from the car
audio business, the PT12311 improves both audio
performances and input surge current capability, these
causes the PT12311 is the best solution for the
cost-effective car audio systems.
APPLICATIONS
• Car Audio
• Home Audio System
• Powered Speaker System
APPLICATION CIRCUIT
22uF
VDD
PT12311
1 REF
SCL 28
2 VDD
SDA 27
3 AGND
27n
27n
Input Surge
Protection
L
AUDIO 3
R
L
AUDIO 2
R
L
AUDIO 1
R
2.2uF
2.2K
2.2uF
2.2K
2.2uF
2.2K
100n
2.2uF
2.2K
2.2uF
2.2K
2.2uF
2.2K
2.2uF
100n
DGND 26
4 TREB_L
LFOUT 25
5 TREB_R
RFOUT 24
6 RIN
LROUT 23
7 ROUT
RROUT 22
8 LOUD_R
MCU
BOUT_R 21
9 RIN3
BIN_R 20
10 RIN2
BOUT_L 19
11 RIN1
BIN_L 18
12 LOUD_L
LOUT 17
13 LIN3
LIN 16
14 LIN2
LIN1 15
10uF
Front Left
10uF
10uF
Front Right
10uF
100n
100n
5.6K
Rear Left
100n
100n
2.2uF
5.6K
Rear Right
Power
Amplifier
Tel: 886-66296288‧Fax: 886-29174598‧ http://www.princeton.com.tw‧2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT12311
BLOCK DIAGRAM
Speaker Attenuator
With Mute
RROUT
LROUT
REF
REF
RFOUT
LFOUT
REF
TREB_L
REF
TREBLE
TREB_R
TREBLE
BIN_L
BIN_R
BASS
BOUT_L
REF
LOUD_L
BASS
Master
Volume
LOUDNESS
Loud
SW
BOUT_R
REF
LOUD_R
LOUDNESS
RIN
LIN
LOUT
ROUT
Input SW and
GAIN
LIN1
Input SW and
GAIN
RIN1
LIN2
RIN2
LIN3
RIN3
REF
REF
VDD
SCL
INT
Ref
REF
REF
BIAS
I2C
DECODER
SDA
DGND
AGND
PRE1.0
2
September, 2009
PT12311
ORDER INFORMATION
Valid Part Number
PT12311-S
Package Type
28 Pins, SOP, 300mil
Top Code
PT12311
PIN CONFIGURATION
REF
1
28 SCL
VDD
2
27 SDA
AGND
3
26 DGND
TREB_L
4
25 LFOUT
TREB_R
5
24 RFOUT
RIN
6
23 LROUT
ROUT
7
LOUD_R 8
RIN3
PT12311
9
21 BOUT_R
20 BIN_R
RIN2 10
19 BOUT_L
RIN1 11
18 BIN_L
LOUD_L 12
PRE1.0
22 RROUT
17 LOUT
LIN3 13
16 LIN
LIN2 14
15 LIN1
3
September, 2009
PT12311
PIN DESCRIPTION
Pin Name
REF
VDD
AGND
TREB_L
TREB_R
RIN
ROUT
LOUD_R
RIN3
RIN2
RIN1
LOUD_L
LIN3
LIN2
LIN1
LIN
LOUT
BIN_L
BOUT_L
BIN_R
BOUT_R
RROUT
LROUT
RFOUT
LFOUT
DGND
SDA
SCL
PRE1.0
I/O
I
I
I
O
I
I
I
I
I
I
I
I
I
O
I
O
I
O
O
O
O
O
I
I
Description
Analog reference voltage (1/2VDD)
Supply input voltage
Analog ground
Left channel input for treble controller
Right channel input for treble controller
Right channel volume controller input
Right channel Input selector output
Right channel loudness input
Right channel input 3
Right channel input 2
Right channel input 1
Left channel loudness input
Left channel input 3
Left channel input 2
Left channel input 1
Left channel volume controller input
Left channel Input selector output
Left channel input for bass controller
Left channel output for bass controller
Right channel input for bass controller
Right channel output for bass controller
Right rear speaker output
Left rear speaker output
Right front speaker output
Left front speaker output
Digital ground
I2C data input
I2C clock input
4
Pin No.
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
September, 2009
PT12311
IMPORTANT NOTICE
Princeton Technology Corporation (PTC) reserves the right to make corrections, modifications, enhancements,
improvements, and other changes to its products and to discontinue any product without notice at any time.
PTC cannot assume responsibility for use of any circuitry other than circuitry entirely embodied in a PTC product. No
circuit patent licenses are implied.
Princeton Technology Corp.
2F, 233-1, Baociao Road,
Sindian, Taipei 23145, Taiwan
Tel: 886-2-66296288
Fax: 886-2-29174598
http://www.princeton.com.tw
PRE1.0
5
September, 2009