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Electronic Volume Controller IC
ATTENUATION DISPLAY OUTPUT
PT2253A
PT2253A has a DC Current Output Pin (DCO). The output level is divided into 13 steps. Please refer to
the table below:
Step
DCO
Attenuation
0
0
-64dB ~
∞
1
2
3
4
5
6
7
8
9
10
11
12
13
I
2I
3I
4I
5I
6I
7I
8I
9I
10I
11I
12I
13I
-60dB ~ -62dB
-54dB ~ -58dB
-50dB ~ -52dB
-44dB ~ -48dB
-40dB ~ -42dB
-34dB ~ -38dB
-30dB ~ -32dB
-24dB ~ -28dB
-20dB ~ -22dB
-14dB ~ -18dB
-10dB ~ -12dB
-4dB ~ - 8dB
0dB ~ -2dB
Current value may fluctuate depending on the IC. When high precision is required, use a variable
resistor as a load resistor.
13
12
11
8
9
1K
7
Vss
5
4
3
2
STEP 0
1
About 100mV + 30mV
Vss
6
8
About 1.3 V
10
PT2253A V2.8
-6-
December, 2005
PTC [ PRINCETON TECHNOLOGY CORP ]
