PT2256 データシートの表示（PDF） - Princeton Technology

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PT2256

Electronic Volume Controller IC

Princeton Technology 

Tel:886-2-66296288

Fax:886-2-29174598

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

Electronic Volume Controller IC

PT2256

DC OUTPUT FOR VOLUME LEVEL

The DC Output for the Volume Level Meter is internally connected to the D/A Converter. PT2256 has 8

stages of output voltage with each stage corresponding to a particular volume level. Please refer to the

table below:

Step

0-3

4-7

8-11

12-15

16-19

20-23

24-27

28-31

Attenuation (dB)

0-6

8-14

16-22

24-30

32-38

40-50

54-66

70-∞

Output Voltage (V)

7/8 VDD

6/8 VDD

5/8 VDD

4/8 VDD

3/8 VDD

2/8 VDD

1/8 VDD

0

UP/DOWN VOLUME CONTROL

PT2256 features two Volume Control Pins, namely: UP and DN. UP is the control pin used to increase

volume level while the DN is the control pin used to decrease the volume level. Thus, volume level may

regulated using the Up or Down Keys. These keys are operated on a 1 step/1 push volume level

control when UP or DN keys are set to “L” Level. If the keys are continuously pressed (input “Low”),

then the volume level continuously steps up or down as the case maybe. Please refer to the diagram

below for the timing of the key input.

/UP, /DN Input

Volume Level

Control

t

T

a

Notes:

1. t= Preventive Time for Chattering (2.2 x 1/fosc )

2. T= Switching Time to Automatic Mode (10 x 1/fosc)

3. a=Up, Down Speed (2x1/fosc)

PT2256 V1.7

-6-

August, 2006

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