Princeton Technology Corp.
Subwoofer Cross-Over Low Pass Filter IC
DESCRIPTION
Tel : 886-2-29162151
Fax: 886-2-29174598
URL:
http://www.princeton.com.tw
PT2351
PT2351 is an 8-pin subwoofer cross-over low pass filter chip utilizing CMOS Technology having a slope rate of
-12dB/oct or -18 dB/oct. Using an external capacitor, the roll-off point can be adjusted to meet your needs or
taste. PT2351 has low distortion, high input impedance and low output impedance design. The application
circuit and pin assignments are optimized for easy PCB Layout and cost saving benefits.
FEATURES
n
CMOS Technology
n
Single Power Supply: 3V to 9V
n
Second Order Low Pass Filter Design with Slope Rate = -12dB/oct
n
Third Order Low Pass Filter Design with Slope Rate = -18 dB/oct
n
Low Output Impedance (Typ. 40 Ohms)
n
Least External Components
n
The Roll-Off Point can be adjusted using an External Capacitor
n
2-Channel Inputs are mixed to a Single Subwoofer Output
n
Available in 8-pin, SO or DIP Package
APPLICATIONS
nMulti-Media
Audio Subwoofer System
nAudio
Equipment
nSound
Card
nHome
Theater System
PT2351 v1.2
1
Updated Nov. 1999
Princeton Technology Corp.
Subwoofer Cross-Over Low Pass Filter IC
PIN CONFIGURATION
Tel : 886-2-29162151
Fax: 886-2-29174598
URL:
http://www.princeton.com.tw
PT2351
VDD
C1
SOUT
R IN
1
2
3
4
8
7
6
5
VSS
C2
VREF
L IN
P T 2351
ORDER INFORMATION
Valid Part Number
PT2351
PT2351-S
Package Type
8 Pins, DIP
8 Pins, SO
PT2351 v1.2
2
Updated Nov. 1999
Princeton Technology Corp.
Subwoofer Cross-Over Low Pass Filter IC
Tel : 886-2-29162151
Fax: 886-2-29174598
URL:
http://www.princeton.com.tw
PT2351
SECOND ORDER LOW PASS FILTER APPLICATION CIRCUIT
The Second Order Low Pass Filter application circuit only needs very few components. The Cross-Over Filter
Point can be adjusted by modifying the values of capacitors -- C1, and C2. For better circuit characteristic, it is
recommended that C2 be twice the value of C1. Please refer to the diagram below.
240 Ohm s
8 .2 V
+
1 0 0µ F
+12V
VDD
VSS
C2
VREF
C1
C1
SOUT
R IN
C2
+
L IN
1 0 0µ F
+
GND
4 .7 µ F
L -C H Inp u t
10µF
+
+
4 .7 µ F
P T 2 3 51
S U B -O U T R -C H In p u t
PT2351 v1.2
3
Updated Nov. 1999
Princeton Technology Corp.
Subwoofer Cross-Over Low Pass Filter IC
THIRD ORDER APPLICATION CIRCUIT
Tel : 886-2-29162151
Fax: 886-2-29174598
URL:
http://www.princeton.com.tw
PT2351
If you need more High Frequency Attenuation, then you just need to add the R-C group between the capacitor
4.7µF and the Input terminals (RIN and LIN) to achieve a Third Order Frequency Response. Please refer to
the diagram below.
2 40 O h m s
8 .2 V
+
1 00 µ F
+ 12 V
VDD
VSS
C2
VREF
C1
C1
SOUT
R IN
C2
+
L IN
1 00 µ F
+
4 .7 µ F
R2
1 0µ F
+
+
4 .7 µ F
R1
PT2351
C3
C4
S U B -O U T
R -C H Inp ut
L -C H In p ut
PT2351 v1.2
4
Updated Nov. 1999
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