CMX625 datasheet(5/34 Pages) CMLMICRO

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ISDN TA POTS Interface

CMX625

 2001 Consumer Microcircuits Limited

D/625/2

CMX625

D5/P4

Signal

Description

Pin No.

Name

Type

VSS

Power

The negative supply rail (ground).

RXP

I/P

The non-inverting input of the receive op-amp.

RXN

I/P

The inverting input of the receive op-amp.

RXO

O/P

The output of the receive op-amp.

VBIAS

O/P

An internally generated bias voltage of VDD/2, except

when the device has been reset, VBIAS will discharge to

VSS. It should be decoupled to VSS by a capacitor

mounted close to the device pins.

TONEFSK

O/P

The sinewave output of the Tones and FSK signal

generators.

TXO

O/P

The output of the buffer amplifier.

TXN

I/P

The inverting input to the buffer amplifier.

TXON

O/P

The inverted output of the buffer amplifier.

DAC OUT

O/P

The output from the digital-to-analogue converter.

RING

O/P

The square, trapezoidal and sinusoidal wave output from

the Ringing Signal Generator.

SPM

O/P

The sinewave output of the SPM signal generator.

VDD

Power

The positive supply rail. Levels and thresholds within the

device are proportional to this voltage. It should be

decoupled to VSS by a capacitor mounted close to the

device pins.

Notes:

I/P

Input

O/P =

Output

Bi-directional

N/C =

No (external) Connection

This device is capable of detecting and decoding small amplitude signals. To achieve this VDD

and VBIAS decoupling and protecting the receive path from extraneous in-band signals are very

important. It is recommended that the printed circuit board is laid out with a ground plane in the

CMX625 area to provide a low impedance connection between the VSS pin and the VDD and VBIAS

decoupling capacitors.

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