
7-107
Features
Single 2.7-3.6 volt supply operation
Programmable
μ
-Law/A-Law Codec and Filters
Programmable ITU-T (G.711)/sign-magnitude
coding
Programmable transmit, receive and side-tone
gains
Fully differential interface to handset
transducers - including 300 ohm receiver driver
Flexible digital interface including ST-BUS/SSI
Serial microport
Single 3 volt supply
Low power operation
ITU-T G.714 compliant
Multiple power down modes
Applications
Battery operated equipment
Digital telephone sets
Cellular radio sets
Local area communications stations
Pair Gain Systems
Line cards
Description
The MT91L60 3V Multi-featured Codec incorporates
a
built-in
Filter/Codec,
programmable sidetone path as well as on-chip
anti-alias filters, reference voltage and bias source.
The device supports both A-Law and
μ
-Law
requirements. The MT91L60 is a true 3V device
employing a fully differential architecture to ensure
wide dynamic range.
gain
control
and
Complete telephony interfaces are provided for
connection to handset transducers. Internal register
access is provided through a serial microport
compatible
with
various
micro-controllers.
industry
standard
The MT91L60 is fabricated in Mitel's ISO
2
-CMOS
technology ensuring low power consumption and
high reliability.
Ordering Information
MT91L60AE
24 Pin Plastic DIP
MT91L60AS
20 Pin SOIC
-40°C to +85°C
Figure 1 - Functional Block Diagram
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7dB
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AA
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AA
AA
AA
AA
M -
M +
HSPKR +
HSPKR -
FILTER/CODEC GAIN
Transducer
Interface
Flexible
Digital
Interface
Timing
ST-BUS
C & D
Channels
Serial Microport
A/
μ
/IRQ
VSSD
VDD
VSSA
VBias
VRef
Din
Dout
STB/F0i
CLOCKin
PWRST
IC
CS
DATA1
DATA2
SCLK
ISSUE 1
May 1995
MT91L60
3 Volt Multi-Featured Codec (MFC)
Advance Information
ISO
2
-CMOS