PT2256 データシートの表示（PDF） - Princeton Technology
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PT2256 Datasheet PDF : 21 Pages
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Electronic Volume Controller IC
PT2256
INCLUDING LOUDNESS BUT NO BACKUP CIRCUIT
VDD (4.5 to 12V)
L-Ch Output
L-Ch Input
10µF +
10µF +
0.1µF
820Ω
8.2nF 820Ω
UP Key
Down Key
Rx
+
Cx
VSS
OUT1
IN1
LT1
AGND
/UP
/DN
OSC
VDD
OUT2
IN2
LT2
AGND
DCO
/INH
/RST
PT2256
0.1µF
820Ω
820Ω
10µF
10µF
8.2nF
0.1µF
100K
0.1µF
R-Ch Output
R-Ch Input
10K
+
100µF
10K
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=2.2µF.
The table for the Rx, Cx and Fosc values are given below.
Rx
Cx
Fosc
33K
1.0µF 34.1Hz
33K
2.2µF 17.8Hz
33K
10µF
3.4Hz
Rx
33K
51K
100K
Cx
1.0µF
1.0µF
1.0µF
Fosc
34.1Hz
22.7Hz
11.8Hz
PT2256 V1.7
- 12 -
August, 2006
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