CMX635 Просмотр технического описания (PDF) - CML Microsystems Plc

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CMX635

ISDN Subscriber Processor

CML Microsystems Plc 

ISDN Subscriber Processor

CMX635

CLOCKOUT

Buffered Clock. A buffered version of the input clock on X1 is available on CLOCKOUT and may

be used for driving the clock inputs of other devices. Optionally the internal phase locked

1.536MHz clock may be routed to CLOCKOUT, which can be utilised by external circuitry to lock

together multiple CMX635 devices if required.

VBias

The internal analogue reference voltage. An external capacitor must be connected between Vbias

and analogue ground to ensure noise free operation.

RX1O, RX1P, RX1N, RX2O, RX2P, RX2N

Output, positive and negative inputs of the differential microphone input amplifiers. See section

1.4.2 for details of the equivalent analogue input circuits.

TX1O, TX1ON, TX1N, TXOP

Differential Outputs, negative input and internal preamplifier output of the earpiece/POTS output

amplifier. See section 1.4.2 for details of the equivalent analogue output circuits. The required

external gain components are inserted between the TX1ON and TX1N pins, which form the input

impedance to the inverting earpiece amplifier.

TX2O, TX2ON

Loudspeaker/Ring amplifier differential outputs.

SPM

Subscriber Pulse Metering sine wave output for emulating POTS style call cost information.

STISet

ST transmitter current set pin. A fixed resistor must be connected between this pin and analogue

Vss to ensure accurate current limit on the ST transmitter.

VSSd, VDDd, VSSa, VDDa

Analogue and Digital supply pins. Ensure adequate high and low frequency decoupling between

positive and negative supplies. It is recommended that the analogue and digital supplies are

locally separated.

© 2001 Consumer Microcircuits Limited

9

D/635/2

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