AT2004 datasheet(6/25 Pages) ETC1

6 / 25 page

AT2004

4 Channels ADPCM Processor with Echo Cancellation and Conferencing

Page 6 of 25

Power

The AT2004 is powered by a 3.3 V source and draws 100 mA at full operation and < 1 mA in powerdown mode.

Initialization

There are two different classes of resets available on the AT2004 chip. For the default reset, hold the RSTZ pin low for 50 ms. This reset

will bring the chip to a functioning default state. In the default state, the following parameters are set:

Pins FSY, CLKP, CLKA default to input (chip will receive these signals from external source)

4 channels of 32k

µ-law ADPCM decoder running on channels 0-3

4 channels of 32k

µ -law ADPCM encoder running on channels 4-7

4 echo canceling-pairs defined as follows:

Channel 0 as reference for channel 4

Channel 1 as reference for channel 5

Channel 2 as reference for channel 6

Channel 3 as reference for channel 7

No Conferencing is selected

A second type of reset involving the use of the 3-wire serial interface can also be used direct the pin I/O configurations of FSY, CLKP,

and CLKA during reset.

AT2004 Datasheet(PDF) 6 Page - List of Unclassifed Manufacturers