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PT2256V-SNL

Electronic Volume Controller IC

Princeton Technology 

Tel:886-2-66296288

Fax:886-2-29174598

URL:http://www.princeton.com.tw

Electronic Volume Controller IC

PT2256V

FUNCTION DESCRIPTION

ATTENUATION

The PT2256V 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

Step 2

29KΩ

Step 9

LT

Step 10

Step 11

22KΩ

Note:

1. Step 22 has an initial value of -46dB.

AGND

Step 30

Step 31

PT2256V V1.2

-4-

August, 2006

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