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73M2921 Datasheet

  • 73M2921

  • Advanced Single Chip Modem

  • 215.32KB

  • 41頁

  • ETC

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73M2921
Advanced Single
Chip Modem
Advanced Information
February 1999
DESCRIPTION
The 73M2921 is a CMOS integrated circuit which
provides all the modem 鈥淒ata Pump鈥?functions
required to implement a V.22bis data modem. It
consists of a DSP (Digital Signal Processor) core
with RAM and ROM data memory, ROM instruction
memory, and register mapped input/output functions
including timers, interrupts,
危鈭?/div>
ADC and DAC ports
and Serial Data I/O.
Once the 73M2921 has been initialized, all call
progress and modem handshaking is automatic.
The default conditions may be changed as required
for country specific or custom applications.
The 73M2921 provides DTMF tone generation and
detection, precise call progress detect and ADSI
functions such as CAS tone detection.
Other features include a parallel interface control
port between the host processor and the 73M2921.
A synchronous serial data channel provides
synchronizing clocks RXCLK and TXCLK from the
modem pump to the controller.
The 73M2921 contains an oscillator and power
control features.
The host controller function can be implemented with
a 73M2910 communications micro controller or
another commercial microcontroller (such as the
68302). The 73M2921 has been optimized to work
with the 73M2910 synchronous serial port.
FEATURES
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Automatic handshaking for all data modes
Data Speeds:
V.22bis - 2400 b/s
V.22, Bell 212 - 1200 b/s
V.21, Bell 103 - 300 b/s
V.23 1200 b/s - 75 b/s
Bell 202 1200 b/s
Facsimile Speeds:
V.29 - 9600, 7200 b/s
V.27ter - 4800, 2400 b/s
V.21 ch 2 - 300 b/s
V.8bis applications
Designed for 3.3 and 5-Volt systems.
Low operating power.
Speaker monitor output
Provides 2 tone generators for single tone or
DTMF generation
Provides DTMF tone detection
Provides 4 precise and 1 imprecise call
progress filters and corresponding detect
bits with programmable
thresholds and
frequencies
Provides CAS tone detection for ADSI and
CLASS廬 feature support
Supports parallel (8 bit)
synchronous serial data I/O
control,
and
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鈥?/div>
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73M2921 provides a microcontroller inter-
rupt
Packaging: The 73M2921 is available in a
QFP production package. A PGA package is
available for prototyping
Rev M

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