Princeton Technology Corp.
Tone Control Subwoofer Low Pass Filter IC
DESCRIPTION
Tel: 886-2-29162151
Fax: 886-2-29174598
URL:
http://www.princeton.com.tw
PT2350
PT2350 is a tone control subwoofer cross-over low pass filter chip utilizing CMOS Technology. It features
a tone control range of + 10dB (50Hz, 4 KHz) and subwoofer low pass filter of the second order Sallen
Key Design. The roll-off point can be adjusted by changing the value of the external capacitor. Pin assign-
ments and application circuits are optimized for easy PCB Layout and cost saving advantages.
FEATURES
!CMOS
Technology
!2
- Channel Input
!3
- Channel Output (Including 1 stereo Output and Subwoofer Output)
!Low
Total Harmonic Distortion (THD<0.01%, Subwoofer THD<0.2%)
!High
S/N Ratio (S/N Ratio <-87dB, A-weighting)
!Least
External Components
!Adjustment
of Frequency response by changing the value of the external component
!Single
Power Supply: 3 to 8.5 Volts
!Available
in 20 pins, DIP or SO Package
APPLICATIONS
!Multi-Media
3D Satellite Speaker and Subwoofer System
!Car
Audio
!Audio
Equipment
!Sound
Card
!Other
Electrical Audio Equipment
Ref. No. 2350 v1.1
1
Written July 1999
Princeton Technology Corp.
Tel: 886-2-29162151
Fax: 886-2-29174598
URL:
http://www.princeton.com.tw
Tone Control Subwoofer Cross-Over Low Pass Filter IC
PIN CONFIGURATION
PT2350
LIN
LB1
LB2
LB3
LT1
LT2
LOUT
VREF
C2
Vss
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
RIN
RB1
RB2
RB3
RT1
RT2
ROUT
SOUT
C1
VDD
PT2350
Ref. No. 2350 v1.1
2
Written July 1999
Princeton Technology Corp.
Tel: 886-2-29162151
Fax: 886-2-29174598
URL:
http://www.princeton.com.tw
Tone Control Subwoofer Cross-Over Low Pass Filter IC
APPLICATION CIRCUIT
PT2350
2
10KVR
(A)
1
4.7uF
4.7uF
Left Channel Bass Control VR
CL1
0.05uF
3
100K (B) VR
2
3
2
1
10K
100K (B) VR
Left Channel Treble Control VR
1
CH1
0.005uF
+
4.7uF/16V
0.15uf
PT2350
8.2VZD
Notes: 1. If you use the above values: Treble Control Range = 4KHz + 10 dB
Bass Control Range = 50 Hz + 10 dB
Subwoofer Output Roll-Off Point is at -3dB at 130Hz
Slope Rate = -12dB/oct
2. It is recommended that you use Mylar or Metal Capacitors for better audio quality.
3. Please do not connect 0.1µF or any by-pass capacitor between the GND and VDD.
Ref. No. 2350 v1.1
3
+
4.7uF/16V
C1
4.7uF/16V
0.068uF
Subwoofer Output
4.7uF/16V
12V
220Ohms
100uF
+
Left
Channel Output
+
RIN
LIN
RB1
LB1
RB2
LB2
RB3
LB3
RT1
LT1
RT2
LT2
LOUT ROUT
VREF SOUT
C1
C2
VDD
Vss
+
Left
Channel Input
3
+
2
1
Right
Channel Input
3
10K VR
(A)
Right Channel Bass Control VR
10K
3
2
1
100K (B) VR
CL2
0.05uF
3
2
1
Right Channel Treble Control VR
0.005uF
CH2
100K (B) VR
Right
Channel Output
Written July 1999
Princeton Technology Corp.
Tone Control Subwoofer Low Pass Filter IC
ORDER INFORMATION
Valid Part N umber
PT2350
PT2350- S
Package Type
20 pins, DIP (300 mil)
20 pins, SO (300 mil)
Tel: 886-2-29162151
Fax: 886-2-29174598
URL:
http://www.princeton.com.tw
PT2350
Ref. No. 2350 v1.1
4
Written July 1999