EMC12 ETC2 [List of Unclassifed Manufacturers], EMC12 Datasheet - Page 33

• Manufacturer Part Number: EMC12
• Description: Audio Interface for the EmPack System
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

EMC12 Hardware Reference Manual
1.5
EMC12 CODECS
This section describes the basic operation of the Crystal CS4231A CODECs, as they are integrated on
the EMC12 mezzanine. Additional details on the operation of the CODECs may be found in the data
sheet for the CS4231A CODEC which is available on CAC’s FTP site
(ftp://ftp.cacdsp.com/pub/datasheets/crystal/cs4231a.pdf).
The EmPack application interface library includes several functions for controlling various settings for the
EMC12 CODECs. All of them operate on a RESOURCE HANDLE obtained by calling the
EmOpenResource function. The functions for setting parameters (EmSetCodec…) may be used to
control individual channels or all 12 channels simultaneously if the RESOURCE HANDLE references the
Broadcast resource, resource ‘m’ of an EMC12 mezzanine. The functions for reading current
parameters (EmGetCodec…) may only be used for individual channels. Brief descriptions of these
functions appear here. More details may be found in the EmPack Software Reference Manual.
1.5.1 Analog I/O
1.5.1.1 Gain Stages and Analog Characteristics
The figure below shows a functional diagram of the input and output gain stages for each of the 12 analog
channels (2 channels per CODEC).
09 Jan 2006
Communication Automation Corporation
1-29