PT2318 Просмотр технического описания (PDF) - Princeton Technology

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PT2318

Sound Fader Controller IC

Princeton Technology 

Tel: 886-2-66296288

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

Sound Fader Controller IC

PT2318

INPUT SIGNAL SELECTION VIA ZERO CROSS MUTE MODE

A selection from the Input A (IN_L1) to Input B (IN_L2) Left Channels produces a modulation click at

the time of the switching. This will depend on the difference between the signal values. Please refer to

the diagram below for the zero cross function (L Channel Only)

V

4

(1)

3

2

1

(2)

0

t1

t2

t

-1

-2

(3)

-3

-4

Notes:

1. (1)=Output

2. (2)=Input 2 (IN_L2)

3. (3)=Input 1 (IN_L1)

At t1, the maximum different between signals is 7Vp-p. At this point, a loud click can be heard. Using

the zero cross detector, no modulation click is audible.

LOUDNESS FUNCTION

The Loudness Function is used in combination with Volume 1 Control Block and may be enabled or

disabled via the I2C Bus Control. Please refer to the table below for Loudness Function setting.

Loudness Function

Loudness On

Loudness Off

LOFF

0

1

Note: LOFF=Loudness Function Control Bit

PT2318 V1.2

- 19 -

March, 2006

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