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PT2256 Datasheet(PDF) 4 Page - Princeton Technology Corp

Part No. PT2256
Description  Electronic Volume Controller IC    
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Maker  PTC [Princeton Technology Corp]
Homepage  http://www.princeton.com.tw
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PT2256 Datasheet(HTML) 4 Page - Princeton Technology Corp

   
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Electronic Volume Controller IC
PT2256
Princeton Technology Corp.
Tel : 886-2-29162151
Fax: 886-2-29174598
URL: http://www.princeton.com.tw
PT2256 v1.3
4
Updated Sept. 2000
APPLICATION CIRCUIT
(Including Loudness but No Backup Circuit)
L-C h O utput
R-Ch O utpu t
R -Ch Input
L-C h Inp ut
Rx
Cx
8.2nF
8.2nF
820 O h m s
820 O h m s
820 O h m s
820 O h m s
820 O h m s
100
Note: Modifying the values of Rx and Cx affects the Oscillator Frequency of the IC. If the Fosc value is
big, then the volume control change is fast. Likewise, if the Fosc value is small, the volume control
change is slow. It is suggested that Rx= 33K, Cx = 2.2uF. The table for the Rx, Cx and Fosc values are
given below.
x
Rx
Cc
s
o
Fx
Rx
Cc
s
o
F
K
3
3F
u
0
.
1z
H
1
.
4
3K
3
3F
u
0
.
1z
H
1
.
4
3
K
3
3F
u
2
.
2z
H
8
.
7
1K
1
5F
u
0
.
1z
H
7
.
2
2
K
3
3F
u
0
1z
H
4
.
3K
0
0
1F
u
0
.
1z
H
8
.
1
1


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