MT8924 Zarlink Semiconductor, MT8924 Datasheet - Page 2

• Manufacturer Part Number: MT8924
• Description: PCM Conference Circuit (PCC)
• Manufacturer: Zarlink Semiconductor

Features
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Applications
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DSTi
Supports up to 10 independent conferences for
up to 32 PCM Voice Channels
ST-BUS compatible 2.048 Mb/s PCM Serial
Interface (also supports 1.536 Mb/s and 1.544
Mb/s data rates)
Per channel digital gain control (0/-3/-6 dB)
Parallel microprocessor port for device control
Programmable noise suppression
External Tone Input
Pin selectable A/ -Law format
Low power CMOS technology
Available in 24 Pin PDIP and SOIC packages
Digital PBX / KTS
Conference bridges
Digital C.O. switches
RESET
Serial-to-Parallel
Conversion
PCM Mode
Linear
/A-Law
Control
to
A/
Attenuation/Noise Suppression
Cki
Timebase
F0i
Figure 1 - Functional Block Diagram
Cko
Channel RAM
PCM Tone
Generator
TF
Adder
and
Description
The MT8924 is designed to provide conference call
capability in digital switching systems. It allows up to
10 independent conferences to be set for up to 32
PCM voice channels.
A/ -Law companded data from the PCM input port is
converted to linear format, processed by a dedicated
arithmetic unit, re-converted to companded format
and then sent to the PCM output port.The PCM
output signal contains all the information of each
channel connected in conference except its own.
Programmable attenuation and noise suppression
are provided for channels connected in conference
or transparent mode. Additionally, an input for an
external tone is featured that can be used as a signal
to indicate to connected parties that they are on a
conference call.
TD
Overflow
MT8924AE
MT8924AS
PCM Conference Circuit (PCC)
OS
RD
Ordering Information
WR
0 C to +70 C
Preliminary Information
Control
Parallel-to-Serial
D0-D7
24 Pin Plastic DIP (600 mil)
24 Pin SOIC
Conversion
ISSUE 1
Linear
/A-Law
to
CS
C/D
MT8924
April 1994
DSTo
8-3