73M2921 datasheet, PDF - EEWORLD Datasheet

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73M2921: DescriptionAdvanced Single Chip Modem; File Size213KB，41 Pages; ManufacturerETC

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73M2921 Overview

Advanced Single Chip Modem

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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 “Data Pump” 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,

Σ∆

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

•

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® feature support

Supports parallel (8 bit)

synchronous serial data I/O

control,

and

•

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

73M2921 Related Products

	73M2921	73M2921-IG
Description	Advanced Single Chip Modem	Advanced Single Chip Modem

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