PT2256 查看數據表（PDF） - Princeton Technology

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PT2256

Electronic Volume Controller IC

Princeton Technology 

Electronic Volume Controller IC

Tel:886-2-66296288

Fax:886-2-29174598

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

PT2256

PIN DESCRIPTION

Pin Number

VSS

OUT1

IN1

LT1

AGND

UP

DN

OSC

RST

/INH

DCO

LT2

IN2

OUT2

VDD

I/O

Description

Pin No.

-

Negative power supply

1

O

Volume output pin 1

2

I

Volume input pin 1

3

O

Tap output pin 1 for loudness function

4

-

Analog ground pins 1

5, 12

Volume up control input pin.

I

The 1 step/1 push volume is controlled by pressing the

up Key. If the key has been pushed continuously

6

increase. Built-in pull-up resistor.

Volume down control input pin.

The 1 step/1 push volume is controlled by pressing the

I

down Key. If the key is continuously pressed, the

7

volume control will continuously decrease. Built-in

pull-up resistor.

Oscillation pin.

I/O

The oscillation circuit of a resistor and capacitor

connection. Oscillator is activated when the key is

8

pressed.

Reset pin.

I

This pin sets the initial volume level. The volume level is

set to -46dB by “L” Input. Built-in pull-up resistor low

9

active

I

Backup mode input pin

10

O

DC output pin for volume level meter

11

O

Tap output pin 2 for loudness function

13

I

Volume input pin 2

14

O

Volume output pin 2

15

-

Positive power supply

16

PT2256 V1.7

-4-

August, 2006

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