Preliminary PT2348
4.1-Channel Audio Processor with Subwoofer
DESCRIPTION
The PT2348 is a 4.1CH audio processor designed for Car Audio purpo. Using I 2C interface controls all of the functions. Like most of audio processor, it equipped up to 4 stereo sources input with adjustable gain, master volume with adaptive loudness, treble and bass tone control.
In a car entertainment system needs front and rear at individual control, the PT2348 provides parate input source lection and output volume adjust ; a special design mixing amp is very easy combine the navigation system or cellular phone’s voice into the car audio system.飘的成语
APPLICATION
• Car Audio
FEATURES
• Controlled by I ²C Interface
• 4 Stereo Inputs (including 1 quasi-differential input)
with lectable input gain
• 2 Channels Electronic Volume ： +15 to -79dB with
1dB/step
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• 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
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• 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 Noi • 36-pin SSOP package
BLOCK DIAGRAM
遣悲怀三首其三
北师大二附
P rinceton Technology Corp .
ANGUS ELECTRONICS CO., LTD
Tel: (852) 2345 0540 Fax: (852) 2345 9948 Web Site: hk
APPLICATION CIRCUIT
OUT
OUT
ORDER INFORMATION
Valid Part Number Package Type Top Code
300mil PT2348-X
SSOP,
PT2348-X 36
Pins,
PIN CONFIGURATION
PIN DESCRIPTION
Pin Name I/O Description Pin No.
SE3R I Single-ended Right Channel Input 3 1
SE2R I Single-ended Right Channel Input 2 2
SE1R I Single-ended Right Channel Input 1 3
SE1L I Single-ended Left Channel Input 1 4
SE2L I Single-ended Left Channel Input 2 5
SE3L I Single-ended Left Channel Input 3 6
DIFFL I Pudo Differential Stereo Input Left 7
DIFFG I Pudo Differential Stereo Input Common 8
DIFFR I Pudo Differential Stereo Input Right 9
IGL O Left Channel Input Selector Output 10
VOL I Left Channel Volume Input 11
LDL I Left Channel Loudness Input 12
IGR O Right Channel Input Selector Output 13
VOR I Right Channel Volume Input 14
LDR I Right Channel Loudness Input 15
BL1 I Left Channel Bass Cap 1 16
BL2 O Left Channel Bass Cap 2 17
Channel
Cap 18
Treble
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Left
TRL I
TRR I Right Channel Treble Cap 19
BR2 O Right Channel Bass Cap 2 20
BR1 I Right Channel Bass Cap 1 21
SOUT O R + L Output (-6db Gain) 22
Filter
Input 23
Subwoofer
SIN I
C2 I Subwoofer Filter Cap 2 24
C1P I Subwoofer Filter Cap 1 25
Subwoofer
Output 26 OUTSW O
OUTRF O Right Front Output 27
Output 28
Rear
Right
OUTRR O
Rear
Output 29
Left
OUTLR O
OUTLF O Left Front Output 30 MIX/OUTSW I/O Mix input / Subwoofer output 31
Voltage 32
Supply
VDD -
CREF I Analog Reference Voltage (1/2 VDD) 33
GND -
Ground 34
INPUT 35
SDA
SDA I
我们中国人INPUT 36 SCL I
SCL
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FUNCTION DESCRIPTIONS
INPUT MULTIPLEXER
The PT2348 provides pudo-differential stereo input and single-ended stereo input, the pudo differential input also could configured as single-ended input 4th, in this configuration the DIFFG pin is no connection.
OUTPUT MULTIPLEXER
Pin 31 is bi-direction function, if D5 of data-byte 03H is 0 the pin 31 will becomes an input pin, an auxiliary source (such navigation system or cellular phone) can be mix with front channel output. Otherwi D5=1 the pin 31 will outputs subwoofer signal. The rear output signal is flexible from cond sources lector or sync with front channel signal. Each channel’s output level can be controlled from +15dB to -79dB and individually, it is well to be the balance and fader control.
oofer Out
