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PT2318

Sound Fader Controller IC

Princeton Technology 

Tel: 886-2-66296288

Fax: 886-2-29174598

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

Sound Fader Controller IC

PT2318

VOLUME CONTROL

The Volume Control Function consists of two blocks; namely, Volume 1 Control Block and Volume 2

Control Block.

VOLUME 1 CONTROL BLOCK

The Volume 1 Control Block has an attenuation range of +20dB to -31dB at 1dB/step. The left and right

channels have the same gain/attenuation setting. This block operates in conjunction with the Loudness

Control. When the Volume 1 Control maximum gain (=20dB) is selected, the filter characteristic is

linear. The filter characteristic increases automatically over a range of 32dB down to

a setting of -12dB. This means that the Volume 1 Control Block maximum filter characteristics is

obtained at a -12dB setting. If the volume is further reduced, the filter characteristics are not in any way

affected. The maximum selected filter characteristics is determined by the external components.

Please refer to the diagram below.

Volume control and Loudness (Low Roll-Off Frequency included)

VOLUME 2 CONTROL BLOCK

The Volume 2 Control Block operates in combination with the Balance and Fader Functions. Each

output has one independent attenuator which has a control range of 0dB to -55dB at 1dB/step with

an additional mute step.

PT2318 V1.2

- 10 -

March, 2006

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