Electronic Volume Controller IC
PT2257
PT2257 v 1.0
Page 1
Updated April 2000
Princeton Technology Corp.
Tel : 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
DESCRIPTION
PT2257 is an Electronic Volume Controller IC utilizing CMOS Technology specially designed for the
new generation of AV Entertainment Products. It has two (2) built-in channels making it ideally suit-
able for mono and stereo sound applications. PT2257 provides an I
2
C Control Interface, an attenuation
range of 0 to -79 dB, low noise, high channel separation. Housed in 8-pin, DIP or SO Package,
PT2257's pin assignments and application circuit are optimized for easy PCB Layout and cost saving
advantages.
FEATURES
CMOS Technology
Low Power Consumption
Least External Components
Attenuation Range: 0 to -79 dB at 1dB/step
Operating Voltage: 5 to 9 V
Low Noise, S/N Ratio>100dB (A-weighting)
Two Channel Output
Available in 8-pin, DIP or SO Package
APPLICATIONS
AV Surround Audio Equipment
Car Audio
Mini Compo
Computer Multi-Media Speaker
Other Audio Equipments
Electronic Volume Controller IC
PT2257
PT2257 v 1.0
Page 2
Updated April 2000
Princeton Technology Corp.
Tel : 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
PIN CONFIGURATION
V
D D
V
S S
L
I N
R
I N
R
O U T
L
O U T
S C L
S D A
1
2
3
4
8
7
6
5
P T 2 2 5 7
APPLICATION CIRCUIT
ORDER INFORMATION
Valid Part Number
Package
PT2257
8-Pin, DIP (300 mil)
PT2257-S
8-Pin, SO (150 mil)
D D
V
S S
L
I N
R
I N
R
O U T
L
O U T
S C L
S D A
1
2
3
4
8
7
6
5
P T 2 2 5 7
M C U
O U T - L
I N - L
I N - R
O U T - R
I C B u s
2
4 7 u f
1 0 u f
1 0 u f
1 0 u f
1 0 u f
MICRO PROCESSOR
PDF 
ZIP