PIC PT2348

PT2348
4.1-Channel Audio Processor with Subwoofer
DESCRIPTION
The PT2348 is a 4.1CH audio processor designed for
Car Audio purpose. Using I2C interface controls all of
the functions. Like most of audio processors, it equips
up to 4 stereo sources input with adjustable gain,
master volume with adaptive loudness, treble and
bass tone control.
In a car entertainment system where needs front and
rear seat individual control, the PT2348 provides
separate input source selection and output volume
adjustment; a special design, mixing amp, is very easy
to combine the navigation system or cellular phone’s
voice with the car audio system.
APPLICATION
•
Car Audio
FEATURES
• Controlled by I2C Interface
• 4 Stereo Inputs (including 1 quasi-differential input)
with selectable input gain
• 2 Channels Electronic VolumeΚ +15 to -79dB with
1dB/step
• 1 Subwoofer Output: +15 to -79dB with 1dB/step
• Adjustable crossover frequency for Subwoofer
• Tone Control (Bass and Treble): -15 to +15dB,
1dB/step
• Input Gain Control: 0 to +15dB, 1dB/step
• Loudness: 0 to -15dB, 1dB/step
• 4 independent speaker outputs: +15 to -79dB with
1dB/step & independent programmable mix input
with 50% mixing ratio for front speakers
• Low Distortion and Low Noise
• 36-pin SSOP package
BLOCK DIAGRAM
Tel: -
ΘFax: -29
᳒‫⫳ܜ‬http://www.princeton.com.tw
PT2348
APPLICATION CIRCUIT
SE3R
2.2uF
SE2R
2.2uF
SE1R
2.2uF
SE1L
2.2uF
SE2L
2.2uF
SE3L
2.2uF
DIFFL
2.2uF
DIFFG
2.2uF
DIFFR
2.2uF
SE3R
SCL
36
2
SE2R
SDA
35
3
SE1R
GND
34
4
SE1L
CREF
33
5
SE2L
VDD
32
6
SE3L
MIX/OUTSW
31
7
8
9
10
11
47nF
2.2uF
47nF
4.7K
100n
100n
DIFFL
OUTLF
DIFFG
DIFFR
IGL
VOL
OUTLR
OUTRR
OUTRF
OUTSW
30
29
28
27
26
12
LDL
C1P
25
13
IGR
C2
24
14
VOR
SIN
23
15
LDR
16
BL1
BR1
21
17
BL2
BR2
20
18
VDD
MIX IN / SWOUT
4.7uF
OUTLF
4.7uF
OUTLR
4.7uF
OUTRR
4.7uF
OUTRF
4.7uF
SWOUT
4.7uF
68n
27n
2.2uF
SOUT 22
TRL
TRR
8.2n
V1.0
MCU
10uF
PT2348
2.2uF
1
19
100n
4.7K
100n
8.2n
2
February 2010
PT2348
ORDER INFORMATION
Valid Part Number
PT2348-X
Package Type
36 Pins, SSOP, 300mil
Top Code
PT2348-X
PIN CONFIGURATION
V1.0
3
February 2010
PT2348
PIN DESCRIPTION
Pin Name
SE3R
SE2R
SE1R
SE1L
SE2L
SE3L
DIFFL
DIFFG
DIFFR
IGL
VOL
LDL
IGR
VOR
LDR
BL1
BL2
TRL
TRR
BR2
BR1
SOUT
SIN
C2
C1P
OUTSW
OUTRF
OUTRR
OUTLR
OUTLF
MIX/OUTSW
VDD
CREF
GND
SDA
SCL
V1.0
I/O
I
I
I
I
I
I
I
I
I
O
I
I
O
I
I
I
O
I
I
O
I
O
I
I
I
O
O
O
O
O
I/O
I
I
I
Description
Single-ended Right Channel Input 3
Single-ended Right Channel Input 2
Single-ended Right Channel Input 1
Single-ended Left Channel Input 1
Single-ended Left Channel Input 2
Single-ended Left Channel Input 3
Pseudo Differential Stereo Input Left
Pseudo Differential Stereo Input Common
Pseudo Differential Stereo Input Right
Left Channel Input Selector Output
Left Channel Volume Input
Left Channel Loudness Input
Right Channel Input Selector Output
Right Channel Volume Input
Right Channel Loudness Input
Left Channel Bass Cap 1
Left Channel Bass Cap 2
Left Channel Treble Cap
Right Channel Treble Cap
Right Channel Bass Cap 2
Right Channel Bass Cap 1
R + L Output (-6db Gain)
Subwoofer Filter Input
Subwoofer Filter Cap 2
Subwoofer Filter Cap 1
Subwoofer Output
Right Front Output
Right Rear Output
Left Rear Output
Left Front Output
Mix input / Subwoofer output
Supply Voltage
Analog Reference Voltage (1/2 VDD)
Ground
SDA INPUT
SCL 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
29
30
31
32
33
34
35
36
February 2010