CMX602AP3 Ver la hoja de datos (PDF) - CML Microsystems Plc

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Fabricante

CMX602AP3

Calling Line Identifier plus Call Waiting (Type II)

CML Microsystems Plc 

Calling Line Identifier

CMX602A

1.5 General Description

1.5.1 Mode Control Logic

The CMX602A's operating mode and the source of the DET and IRQN outputs are determined by the logic

levels applied to the MODE and ZP input pins;

ZP MODE

Mode

0

0 Tone Alert Detect

0

1 FSK Receive

DET o/p from

Tone Alert Signal

Detection

FSK Level Detector

1

0 'Zero-Power'

Ring or Line Polarity

Reversal Detector.

IRQN o/p from

Valid ‘off-hook’ CAS.

Ring or Line Polarity

Reversal Detector.

FSK Data Retiming [1].

Ring or Line Polarity

Reversal Detector.

Ring or Line Polarity

Reversal Detector.

1

1 'Zero-Power'

Ring or Line Polarity

-

Reversal Detector.

[1] If enabled.

In the 'Zero-Power' modes, power is removed from all of the internal circuitry except for the Ring or Line

Polarity Reversal Detector and the DET and IRQN outputs.

1.5.2 Input Signal Amplifier

This amplifier is used to convert the balanced FSK and Tone Alert signals received over the telephone line to

an unbalanced signal of the correct amplitude for the FSK receiver and Tone Alert Detector circuits.

Figure 3a : Input Signal Amplifier, balanced input configuration

The design equations for this circuit are;

Differential voltage gain VAOP / V(b-a) = R8/R6

R6 = R7 = 470kΩ

R10 = 160kΩ

R9 = R8 x R10 / (R8 - R10)

The target differential voltage gain depends on the expected signal levels between the A and B wires and the

CMX602A's internal threshold levels, which are proportional to the supply voltage.

© 1998 Consumer Microcircuits Limited

7

D/602A/4

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