CMX869E2 查看數據表（PDF） - CML Microsystems Plc

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CMX869E2

Low Power V.32 bis Modem

CML Microsystems Plc 

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

the on-chip regulator, the C-BUS interface and the Ring Detector.

© 2003 CML Microsystems Plc

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D/869/1

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