PT2256 查看數據表（PDF） - Princeton Technology
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PT2256 Datasheet PDF : 21 Pages
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Electronic Volume Controller IC
Tel:886-2-66296288
Fax:886-2-29174598
URL:http://www.princeton.com.tw
PT2256
FUNCTION DESCRIPTION
ATTENUATION
The PT2256 volume control circuit consists of ladder resistors and analog switches. The Tap for
loudness function is connected to the Step 10 (-20dB). When the (3.9KΩ) resistor is connected
between LT and AGND pins, the attenuation is given in table below.
Step
0
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
Attenuation
(dB)
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
-22
-24
-26
-28
-30
Step
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
Attenuation
(dB)
-32
-34
-36
-38
-40
-42
-46
-50
-54
-58
-62
-66
-70
-74
-78
∞
The equivalent circuit is shown below:
OUT
IN
Step 0
Step 1
2 9 KΩ
Step 2
LT
2 2 KΩ
Step 9
Step 10
Step 11
AGND
Step 30
Step 31
Note: Step 22 has an initial value of -46dB.
PT2256 V1.7
-5-
August, 2006
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