Preliminary
PT2347
Stereo Audio Processor
DESCRIPTION
The PT2347 is an audio processor designed for
versatile application, it adopts all of functions from
successful predecessor- the PT2313L, and it includes
3 stereo input selector with adjustable gain, master
volume control with low frequency loudness
compensation, individual output attenuator and tone
control.
In car audio applications, maximum power output of
the audio set is measurement on saturated condition, it
may not achieve the goal if power amplifier does not
have enough gain, therefore, the PT2347 provides
extra +10dB voltage gain in final output stage, it is
easy to drive the power amplifier into saturated power
and eliminates external gain OPAMP.
FEATURES
•
Controlled by I²C interface
•
Direct replace the PT2313L with +10dB output
gain
•
3 stereo inputs with gain selection, range from 0dB
to +11.25dB in 3.75dB/step
•
Master volume from 0dB to -78.75dB in
1.25dB/step
•
Speaker attenuator for balance and fader, range
from 0dB to -38.75dB in 1.25dB/step
•
Each 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 = 4V to 10V)
•
Low harmonic distortion Low noise
APPLICATIONS
•
Car audio
•
Home audio system
•
Powered speaker system
BLOCK DIAGRAM
Speaker Attenuator
With Mute
LROUT
RROUT
+10dB GAIN
LFOUT
REF
REF
+10dB GAIN
RFOUT
REF
TREB_L
BIN_L
BOUT_L
BASS
TREBLE
REF
TREBLE
TREB_R
Master
Volume
REF
BIN_R
BASS
BOUT_R
Loud
SW
REF
LOUDNESS
LOUD_R
LOUD_L
LOUDNESS
LIN
LOUT
LIN1
LIN2
LIN3
RIN
ROUT
Input SW and
GAIN
Input SW and
GAIN
RIN1
RIN2
RIN3
REF
VDD
I2C
DECODER
REF
SCL
SDA
DGND
REF
REF
BIAS
AGND
Tel: 886-66296288
‧
Fax: 886-29174598
‧
http://www.princeton.com.tw
‧
2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT2347
ORDER INFORMATION
Valid Part Number
PT2347-S
Package Type
28 Pins, SOP, 300mil
Top Code
PT2347-S
PIN CONFIGURATION
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
I
2
C data input
I
2
C clock input
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
3
ARM技术
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