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PT2353 V1.2

- 5 -

March, 2006

Satellite + Subwoofer 3-Speaker System Electronics Crossover IC

PT2353

FUNCTION DESCRIPTION

VOLUME CONTROL

Both main volume control and subwoofer volume control are supported by PT2353. Please refer to the

diagram below.

Signal Source

LPF

HPF

Main Volume Output

(Only one channel is shown)

Subwoofer

Volume

Control

Subwoofer Output

Main

Volume

Control

The main volume control is used to adjust all audio volume levels. The subwoofer volume control can

be adjusted to match the main volume control. The Main Volume Control is determined by the MUP

and/ MDW pins. If the /MUP is connected to the Ground, the main volume level output may be

increased. If the /MDW is connected to the Ground, the main volume level output can be decreased.

The Subwoofer Volume Control is determined by the /SUP and /SDW pins. If the /SUP is connected to

Ground, the subwoofer volume level output can be increased. If the /SDW is connected to the Ground,

the subwoofer volume level output can be decreased.

When each of the /MUP, /MDW, /SUP, /SDW pins are connected to the GND for an indefinite period of

time, please refer to the following diagram.

t

T

α

/M PU , /M DW, /S UP, /SD W

Input Status

Vo lum e Con tro l Statu s

Notes:

1. t=Default Key Time

2. T=Hold Time (10 x 1/fosc)

3.

α=Volume UP/DOWN Switch Time (2 x 1/fosc)

4. fosc=Internal Oscillation Frequency