CMX602A 查看數據表（PDF） - MX-COM Inc

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CMX602A

Calling Line Identifier/Calling Line Identifier on Call Waiting

MX-COM Inc  

Calling Line Identifier/Calling Line Identifier on Call Waiting 6

4. General Description

CMX602A PRELIMINARY INFORMATION

4.1 Mode Control Logic

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

levels applied to the MODE and ZP input pins.

ZP MODE

Mode

DET output from

0

0 Tone Alert Detect Tone Alert Signal Detection

0

1 FSK Receive

FSK Level Detector

1

0 Zero-Power

1

1 Zero-Power

Ring or Line Polarity

Reversal Detector

Ring or Line Polarity

Reversal Detector

IRQ output from

Valid 'off-hook' CAS Duration.

Ring or Line Polarity Reversal Detector

FSK Data Retiming (if enabled). Ring or

Line Polarity Reversal Detector.

Ring or Line Polarity Reversal Detector.

None

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 IRQ outputs.

4.2 Input Signal Amplifier

The Input Signal 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.

AMPOUT

A

C6 R6

R8 IN-

B

IN+

C7 R7 R9

R10 VSS

-

+

Input Signal

Amplifier

VBIAS

C9

Figure 3: Input Signal Amplifier, balanced input configuration

The design equations for this circuit are:

Differential

Voltage

Gain

VAMPOUT

V(B-A)

=

R8

R6

R6 = R7 = 470k:

R9

=

R8 u

(R8 -

R10

R10)

R10 = 160k:

The target differential voltage gain depends on the expected A and B input signal levels and the CMX602A's

internal overload and threshold levels, which are proportional to the supply voltage.

The CMX602A has been designed to meet the applicable specifications when R8 = 430k: at VDD = 3.0V

nominal, rising to 680k: at VDD = 5.0V (see note) and R9 = 240k: at VDD = 3.0V dropping to 200k: at

VDD = 5.0V as indicated in Section 3 and as shown in Figure 5. Reference Notes found in Section 3.

¤1999 MX-COM, Inc

www.mxcom.com Tel: 800 638 5577 336 744 5050 Fax: 336 744 5054

Doc. # 20480169.004

4800 Bethania Station Road, Winston-Salem, NC 27105-1201, USA All trademarks and service marks are held by their respective companies.

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