PT2037
Digitally Controlled Audio Processor
DESCRIPTION
The PT2037 is a multiple functions audio signal
processor, very low distortion and low noise are
obtained by the advanced CMOS fabricate technology.
All of characteristics and functions are designed for the
customer who needs high performance and better
hearing experience. This device provides a lot of new
features like soft-mute and zero-crossing mute to
minimize the noises during the audio sources are
switching. Further more, the device equipped
differential audio inputs to improve the Common Mode
Reject Ratio and it is very helpful to canceling ground
loop hum noises in the car and audio dock system.
FEATURES
•
Input multiplexer
- 4 Stereo input
- 1 Mono input
- 1 Differential input
- Selectable input gain for optimal adaptation to
different sources
•
Multiple MUTE function
- Software controlled: Direct Mute, Zero-Crossing
Mute and Soft Mute
- Hardware controlled: Soft Mute
•
Fully programmable loudness function
•
Volume control in 1dB steps including gain up to
16dB
•
3 band (Bass, Middle and Treble ) tone control
•
Four independent speaker attenuators control in
1dB steps for balance and fader facilities
•
Programmable threshold for pause and zero cross
mute detector
•
All functions programmable via serial I
2
C bus
APPLICATIONS
•
Car audio
•
Audio dock system
•
Mini compo system
BLOCK DIAGRAM
MUXOUT_L
21
STEREO1_L
STEREO2_L
STEREO3_L
STEREO4_L
DIFF_L
DIFFGND_L
MONO
STEREO1_R
STEREO2_R
STEREO3_R
STEREO4_R
DIFF_R
DIFFGND_R
DVDD
AVDD
16
17
18
15
14
13
11
8
9
10
7
6
5
41
42
SUPPLY
SPEAKER
ATT
MUTE CONTROL
SOFT,ZERO
39
CREF
3
MUXOUT_R
2
IN_R
4
LOUD_R
1
TREB_R
23
MID_RO
22
MID_RI
27
BASS_RO
26
BASS_RI
28
SMEXT
35
PAUSE
19
CSM
32
OUT_RF
INPUT MULTIPLEXER
IN GAIN
VOLUME
+LOUDN
43
AGND
IN GAIN
VOLUME
+LOUDN
TREBLE
MIDDLE
BASS
SOFT
MUTE
BASS_LO
BASS_LI
MID_LO
LOUD_L
TREB_L
MID_LI
IN_L
20
12
44
30
31
25
24
SPEAKER
ATT
SPEAKER
ATT
34
OUT_LF
33
OUT_LR
40
38
I2C BUS DECODER +LATCHES
37
36
ADDR
SCL
SDA
DGND
TREBLE
MIDDLE
BASS
SOFT
MUTE
SPEAKER
ATT
29
OUT_RR
Tel: 886-66296288
‧
Fax: 886-29174598
‧
http://www.princeton.com.tw
‧
2F, 233-1, Baociao Road, Sindian, Taipei 23145, Taiwan
PT2037
APPLICATION CIRCUIT
POWER
VDD
GND
2
1
50
ADDR SEL
22uF
5.6nF
44 TREB_L
TREB_R
IN_R
MUXOUT_R
LOUD_R
DIFFGND_R
DIFF_R
STEREO4_R
STEREO1_R
STEREO2_R
MCU
OUTPUTS
OUT_LF
4.7uF
35 PAUSE
34 OUT_LF
22uF
10uF
100n
43 AGND
42 AVDD
41 DVDD
40 ADDR
39 CREF
38 SCL
37 SDA
36 DGND
1
5.6nF
2
3
4
47nF
DIFFG_R
4.7uF
DIFF_R
4.7uF
ST4_R
470nF
ST1_R
470nF
ST2_R
470nF
ST3_R
470nF
MONO
470nF
9
8
7
6
5
OUT_RF
OUT_LR
MID_LI
MID_LO
OUT_RR
SMEXT
BASS_RO
BASS_RI
BASS_LO
BASS_LI
DIFFGND_L
STEREO4_L
STEREO1_L
STEREO2_L
STEREO3_L
MUXOUT_L
MID_RO
MID_RI
33
4.7uF
32
4.7uF
31
30
29
4.7uF
28
27
100nF
26
100nF
25
100nF
24
100nF
23
22nF
2.7K
18nF
5.6K
5.6K
18nF
2.7K
22nF
OUT_RF
OUT_LR
2.2uF
PT2037
OUT_RR
10 STEREO3_R
11 MONO
LOUD_L
DIFF_L
IN_L
INPUTS
DIFFG_L
47nF
DIFF_L
ST4_L
ST1_L
ST2_L
ST3_L
CSM
14
15
16
17
18
19
20
21
22
Notes:
1. AGND and DGND trace on the PCB layout must be separated, tight separated GND path together on the bypassing capacitor negative terminal.
2
A 50Ω resistor on the DGND path could minimize the I C noises to interference audio outputs.
2. Refer the differential input section description to achieve correspond wiring instruction.
12
4.7uF
13
4.7uF
470nF
470nF
470nF
470nF
2.2nF
2.2uF
V1.2
2
October 2009
PT2037
ORDER INFORMATION
Valid Part Number
PT2037-LQ
Package Type
44 Pins, LQFP
Top Code
PT2037-LQ
PIN CONFIGURATION
V1.2
3
October 2009
PT2037
PIN DESCRIPTION
Pin Name
TREB_R
IN_R
MUXOUT_R
LOUD_R
DIFFGND_R
DIFF_R
STEREO4_R
STEREO1_R
STEREO2_R
STEREO3_R
MONO
LOUD_L
DIFFGND_L
DIFF_L
STEREO4_L
STEREO1_L
STEREO2_L
STEREO3_L
CSM
IN_L
MUXOUT_LR
MID_RI
MID_RO
BASS_LI
BASS_LO
BASS_RI
BASS_RO
SMEXT
OUT_RR
MID_LO
I/O
I
I
O
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
I
O
I
O
I
O
I
O
I
O
O
Description
External Cap for the right channel treble filter
Volume input of the right channel
Sources selection multiplexer output of the right channel
External Cap for the right channel loudness filter
Negative input of the differential amplifier, right channel
Positive input of the differential amplifier, right channel
Single-ended input No.4 of the right channel
Single-ended input No.1 of the right channel
Single-ended input No.2 of the right channel
Single-ended input No.3 of the right channel
Mono audio input
External Cap for the left channel loudness filter
Negative input of the differential amplifier, left channel
Positive input of the differential amplifier, left channel
Single-ended input No.4 of the left channel
Single-ended input No.1 of the left channel
Single-ended input No.2 of the left channel
Single-ended input No.3 of the left channel
Determinate soft mute time constant, connect a cap to GND
Volume input of the left channel
Sources selection multiplexer output of the left channel
Right channel mid filter input
Right channel mid filter output
Left channel bass filter input
Left channel bass filter output
Right channel bass filter input
Right channel bass filter output
Soft mute hardware control pin, internal pull up to half of AVDD, pull down
to GND active soft mute function, open or pull up to AVDD for normal
operation.
Right channel rear output
Left channel mid filter output
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
V1.2
4
October 2009
PT2037
Pin Name
MID_LI
OUT_LR
OUT_RF
OUT_LF
PAUSE
DGND
SDA
SCL
CREF
ADDR
DVDD
AVDD
AGND
TREB_L
I/O
I
O
O
O
O
-
I
I
I
I
-
-
-
I
Left channel mid filter input
Left channel rear output
Right channel front output
Left channel front output
Pause detector output
Digital ground
I
2
C data input/output
I
2
C clock input
Internal reference bypass, connect a cap to AGND
I
2
C chip address selection, keep open=88H, pull up to DVDD =8AH.
Digital power supply
Analog power supply
Analog ground
External cap for left channel treble filter
Description
Pin No.
31
32
33
34
35
36
37
38
39
40
41
42
43
44
V1.2
5
October 2009
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