®
ISO
2
-CMOS ST-BUS™ FAMILY
MT9094
Digital Telephone (DPhone-II)
Features
•
•
•
•
Programmable µ-Law/A-Law codec and filters
Programmable CCITT (G.711)/sign-magnitude
coding
Programmable transmit, receive and side-tone
gains
DSP-based:
i) Speakerphone switching algorithm
ii) DTMF and single tone generator
iii) Tone Ringer
Differential interface to telephony transducers
Differential audio paths
Single 5 volt power supply
ISSUE 2
May 1995
Ordering Information
MT9094AP
44 Pin PLCC
-40°C to +85°C
Description
The MT9094 DPhone-II is a fully featured integrated
digital telephone circuit. Voice band signals are
converted to digital PCM and vice versa by a
switched capacitor Filter/Codec. The Filter/Codec
uses an ingenious differential architecture to achieve
low noise operation over a wide dynamic range with
a single 5V supply. A Digital Signal Processor
provides handsfree speaker-phone operation. The
DSP is also used to generate tones (DTMF, Ringer
and Call Progress) and control audio gains. Internal
registers are accessed through a serial microport
conforming to INTEL MCS-51™ specifications. The
device is fabricated in Mitel's low power ISO
2
-CMOS
technology.
•
•
•
Applications
•
•
•
Fully featured digital telephone sets
Cellular phone sets
Local area communications stations
DSTo
DSTi
F0i
C4i
VSSD
VDD
VSSA
VSS
SPKR
VBias
VRef
Digital Signal Processor
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22.5/-72dB
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∆1.5dB
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AAAA
AAAAAAAA
Tx &
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Rx
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Filter/Codec Gain
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7dB
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ENCODER
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-7dB
DECODER
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MIC-
Transducer
Interface
MIC+
M-
M+
C-Channel
Registers
STATUS
Control
Registers
HSPKR+
HSPKR-
SPKR+
SPKR-
Timing
Circuits
New Call
Tone
Generator
Serial
Port
(
MCS-51
Compatible)
LCD Driver
S/P &
P/S
Converter
DATA 2
DATA 1
SCLK
CS
S1
S12
BP
WD PWRST IC
Figure 1 Functional Block Diagram
7-45
MITEL [ MITEL NETWORKS CORPORATION ]
