PT2253A Ver la hoja de datos (PDF) - Princeton Technology

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Fabricante

PT2253A

Electronic Volume Controller IC

Princeton Technology 

Electronic Volume Controller IC

Tel: 886-2-66296288

Fax: 886-2-29174598

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

PT2253A

INITIALIZATION WHEN POWER ON

PT2253A has the built-in auto-initializing function for during the Power ON period. It has the power

supply on reset for the initialization of the chip. If the power supply rises too fast, the initialization may

not be fully effected. For initialization to be fully effective, it is necessary to satisfy the following

conditions:

1. The /INH Terminal must be raised simultaneously with the supply voltage.

2. Initial attenuation level is -40dB

Please refer to the following diagram.

Vcc-Vss or /INH TERMINAL VOLTAGE

Vcc-Vss = 4.0 V

T > 1 msec

T

Note: If Vcc-Vss drops below 4.0V, the auto-initializing function is actuated.

BACK UP WHEN POWER OFF

When /INH Pin is set at “L” Level, all input and output pins are disabled and the current consumption is

reduced to the minimum. Under this condition, the backup by means of a capacitor becomes possible.

An example of this application when a backup capacitor is used is shown below.

Vcc

VDD

10K

10K

1000µ +

16V -

Vcc

PT2253A

Vss

/INH

-Vss

51K

If Vcc-Vss drops below 4V, the backup becomes impossible.

PT2253A V2.8

-9-

December, 2005

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