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PDF CMX869 Data sheet ( Hoja de datos )
| Número de pieza | CMX869 | |
| Descripción | Low Power V.32 bis Modem | |
| Fabricantes | CML Microcircuits | |
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CML Microcircuits
COMMUNICATION SEMICONDUCTORS
CMX869
Low Power
V.32 bis Modem
D/869/3 February 2004
Features
• V.32 bis/V.32/V.22 bis/V.22 automodem. (14400,
12000, 9600, 7200, 4800, 2400, 1200 bps duplex)
• V.23 (1200/75, 1200/1200, 75, 1200 bps FSK)
• Bell 202 (1200/150, 1200/1200, 150, 1200 bps FSK)
• V.21 or Bell 103 (300/300 bps FSK)
• DTMF/Tones Transmit and Receive
• ‘Powersave’ Standby Mode
Provisional Issue
Applications
• Telephone Telemetry Systems
• Remote Utility Meter Reading
• Security Systems
• Industrial Control Systems
• Electronic Cash Terminals
• Pay-Phones
• Cable TV Set-Top Boxes
www.DataSh1e.et4U.comBrief Description
The CMX869 is a multi-standard modem for use in telephone based information and telemetry systems.
It can transmit and detect standard DTMF and modem calling and answer signals or user-specific
programmed single or dual tone signals. A general purpose Call Progress signal detector is also included.
Flexible line driver and receive hybrid circuits are integrated on chip, requiring only passive external
components to build a 2 or 4-wire line interface.
The device also features a software controlled hook switch Relay Drive output and a Ring Detector
circuit, which continue to function when the device is in the Powersave mode. When a line voltage
reversal or ringing signal is detected, the Ring Detect Circuit can provide an interrupt which can be used
to wake up the host µController.
Control of the device is via a simple high speed serial bus that operates in normal and Powersave
modes, and is compatible with most types of µC serial interface. The data transmitted and received by
the modem is also transferred over the same serial bus. On-chip programmable Tx and Rx USARTs
meeting the requirements of V.14 are provided for use with asynchronous data and to allow unformatted
synchronous data to be received or transmitted as 8-bit words or as a HDLC packet.
The CMX869 operates from a single 3.3V supply over a temperature range of -40°C to +85°C and is
available in 24-pin TSSOP (E2), SOIC (D2) and DIL (P4) packages.
© 2004 CML Microsystems Plc
1 page  
Low Power V.32 bis Modem
CMX869
Signal list (cont.)
CMX869 E2
Signal
Description
Pin No.
3, 19
7, 16
12
23
Notes:
IP
OP
TS
PWR
NC
Name
DVSS
AVSS
AVDD
Type
PWR
PWR
PWR
DVDD
PWR
= Input
= Output
= 3-state Output
= Power
= No Connection
The negative supply rail (ground) for the digital on-chip
circuits.
The negative supply rail (ground) for the analogue on-
chip circuits.
The positive supply rail for the analogue on-chip
circuits. Levels and thresholds within the device are
proportional to this voltage.
The positive supply rail for the digital on-chip circuits.
www.DataSheet4U.com
© 2004 CML Microsystems Plc
5
D/869/3
5 Page 
Low Power V.32 bis Modem
CMX869
5. General Description
The CMX869 can operate as a full duplex QAM (Quadrature Amplitude Modulation) or DPSK (Differential
Phase Shift Keying) automodem, using the following modulation schemes:
• V.32bis
• V.32
• V.22bis
• V.22
with data rates of 14400, 12000, 9600, 7200, 4800, 2400 or 1200bps.
Note: reference to QAM elsewhere in the datasheet implies QAM or DPSK, according to selected
operating mode.
It can also be set to operate in the following low speed modem modes:
• V.21 or Bell 103. 300/300bps duplex FSK (Frequency Shift Keying).
• V.23 modem. 1200 or 75 bps FSK.
• Bell 202 modem. 1200 or 150 bps FSK.
The transmit circuits can also be set to any one of the following:
• DTMF transmit.
• Single tone transmit (from a range of modem calling, answer and other tone frequencies)
• User programmed tone or tone pair transmit (programmable frequencies and levels)
• Disabled.
And the receive circuits can be set to:
• DTMF detect.
• 2100Hz and 2225Hz answer tone detect.
• Call progress signal detect.
• User programmed tone or tone pair detect.
• Disabled.
The Ring Detect, Tone Decoder and FSK modem circuits can be configured to facilitate Type 1 (On-
Hook) Caller Identification. This facility is the subject of separate application notes.
When not in use, the CMX869 may be set into a Powersave mode, which disables all circuitry except for
www.DataShtheeet4oUn.c-ocmhip regulator, the C-BUS interface and the Ring Detector.
© 2004 CML Microsystems Plc
11
D/869/3
11 Page | ||
| Páginas | Total 30 Páginas | |
| PDF Descargar | [ Datasheet CMX869.PDF ] | |
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