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CMX850-1

Communications Controller IC

CML Microsystems Plc 

Integral Low-Power Modem

Modem Data Options

n V.22bis 2400b/s QAM

n V.22 1200 or 600 b/s DPSK

n V.23 1200 or 75 b/s FSK

n V.21 300b/s FSK

n Bell 212A 1200 or 600 b/s DPSK

n Bell 202 1200 or 150 b/s FSK

n Bell 103 300b/s FSK

2 or 4 line system

telephone

Line Interface

CMX850 Modem Section

EN

Phone Interface

S

EN

RT

RING

DETECT RD

HT

OFF-HOOK

DETECT HD

Rx Modem Filter

and

Equaliser

DTMF / Tone

Call Progress /

Answer Tone

Detectors

Transmit Filter

and

Equaliser

DTMF / Tone

Generator

descramble

enable

QAM/DPSK

Demodulator

FSK

Demodulator

Modem Energy

Detector

FSK

Modulator

QAM/DPSK

Modulator

scramble

enable

'C-BUS'

Serial

Interface

‘C-BUS’ Interface

SERIAL CLOCK

COMMAND DATA

REPLY DATA

CSN

IRQN

RDRVN

Modulation Schemes

n QAM Quadrature Amplitude Modulation n DPSK - Differential Phase Shift Keying n FSK - Frequency Shift Keying

5

to on-chip

‘C-BUS’

Controller

Modem Features

V.14 Compatible USART

n Individual Rx and Tx facilities

Data Scrambling (DPSK and QAM)

n Twin selectable data scramble and descramble formats

Modem Powersave

n Disables all modem-section circuitry except for ‘C-BUS’ and the

‘Ring’ and ‘Hook’ detectors

Rx and Tx Line Equalisation

n ‘Fixed compromise’ line equaliser for 600, 1200 and 2400 bps

Analogue Input / Output Control and Paths

n Selectable ‘line’ and ‘phone’ line drives via differential amplifiers

Level Setting

n Independent Rx and Tx (phone and line) setting;

Range: 0 to -10.5 dB

Rx Pattern Detection

n 10101010 ... bit reversals (FSK)

n Continuous 1s (DPSK and QAM)

n Continuous 0s (DPSK and QAM)

Inband Audio

DTMF and Single Tones

n Generates and detects single or dual frequency inband tones

n Programmable tones, tone pairs and bandwidths

n Programmable Tx DTMF twist

Custom Tones/Pairs

n 2 Rx and 4 Tx Tone Pairs can be programmed (max f = 3.4kHz)

n Tx/Rx CAS Tone features available (2130 + 2750 Hz)

n Frequency and level setting facility

Call Progress Frequency Detection

n Detects and indicates inband tones in range: 275 to 665 Hz

Answer Tone Detection

n Indicates when a valid 2225Hz or 2100Hz signal is detected

Relay Drive Output

n Available for ‘hook-switch’ type operations

‘Off Hook’ and ‘Ring’ Detection

n Detects large amplitude AC ‘ringing’ signals

n Stand-alone FSK (CLI) demodulator with high sensitivity CAS

tone detector

n Detects CAS tone in the presence of near-end (phone) signals

n Detects ‘off hook’ voltage-change across phone ‘tip’ and ‘ring’

lines

n Provides ‘ring’ and ‘hook’ interrupts and status indication

n Modem operation can be stopped on ’hook detect’

n Selectable ‘tone detect’ timing window

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