Princeton Technology Corp.
Electronic Volume Controller IC
Tel : 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
PT2257
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 suitable for mono and stereo sound applications. PT2257 provides an I2C 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
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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
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AV Surround Audio Equipment
Car Audio
Mini Compo
Computer Multi-Media Speaker
Other Audio Equipments
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
Electronic Volume Controller IC
PT2257
PIN CONFIGURATION
L IN
1
8
R IN
LO U T
2
3
7
6
ROUT
4
5
VSS
SDA
VDD
SCL
PT2257
APPLICATION CIRCUIT
10uf
IN -L
O U T -L
10uf
10uf
1 LIN
RIN 8
2
LO U T RO U T 7
3
DD 6
VS S
4 SDA
IN -R
O U T -R
10uf
SCL 5
47uf
PT2257
2
IC B u s
MCU
MICRO PROCESSOR
ORDER INFORMATION
Valid Part Number
PT2257
PT2257-S
PT2257 v 1.0
Page 2
Package
8-Pin, DIP (300 mil)
8-Pin, SO (150 mil)
Updated April 2000