PT2256V 查看數據表（PDF） - Princeton Technology
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PT2256V Datasheet PDF : 19 Pages
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Electronic Volume Controller IC
PT2256V
INCLUDING LOUDNESS BUT NO BACKUP CIRCUIT
VDD (4.5 to 11V)
L-Ch Output
L-Ch Input
10µF +
10µF +
8.2nF
820Ω
0.1µF
820Ω
UP Key
Down Key
Rx
+
Cx
VSS
OUT1
IN1
LT1
AGND
/UP
/DN
OSC
VDD
OUT2
IN2
LT3
AGND
DCO
/INH
/RST
PT2256V
0.1µF
+ 10µF
+ 10µF
820Ω
8.2nF
820Ω
0.1µF
100K
0.1µF
R-Ch Output
R-Ch Input
10K
+
10K
100µF
Notes:
1. 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.
2. 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
PT2256V V1.2
- 11 -
August, 2006
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