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:
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•
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•
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:
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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:
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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.
The receive circuits can also be set to:
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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
the on-chip regulator, the C-BUS interface and the Ring Detector.
© 2004 CML Microsystems Plc
11
D/869/4
CMLMICRO [ CML MICROCIRCUITS ]
