MH88524 데이터 시트보기 (PDF) - Mitel Networks

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MH88524

Dual 2-4 Wire Circuit

Mitel Networks 

Preliminary Information

MH88524

VIN RX1

VOUT TX2

MH88524

RX1

TX1

JUN1

754Ω

RX2

JUN2

TX2

VDD AGND VEE

VOUT

754Ω JUN2

Notes

1) In addition to the above test circuit:

+5V

Apply VIN JUN1 and measure VOUT TX2 and VOUT JUN1.

Apply VIN JUN2 and measure VOUT TX1 and VOUT JUN1

Apply VIN RX2 and measure VOUT TX1 and VOUT JUN1.

2) All ground connections are star configured (i.e., single

point ground).

-5V

CT (Crosstalk) calculation

Examples:

CT = 20xlog (VIN RX1/VOUT JUN2)

CT = 20xlog (VIN RX1/VOUT TX2)

Figure 10 - Application Circuit for Crosstalk Test

Analog Signal Input

Digital Data Input

(2kHz max)

Digital Data Output

MT8840

TXD1

TX0

RXD0

RX1

VSS

MH88524

RX1

JUN1

TX1

AGND

32kHz ASK plus

Analog Input/Output

Analog Signal Output

High Pass

Filter

Low Pass

Filter

MH88500

TIP

JUNCTOR

RING

GND

To Telephone Station

Set Input/Output

Notes:

1) See MT8840 data sheet for device details.

2) See MH88500 data sheet for device details. Note that

this device is optional in this applications circuit.

3) High Pass Filter is typically 2nd order 15kHz

4) Low Pass Filter is typically 2nd order 4kHz

Figure 11 - Application Circuit with MT8840, MH88500 and MH88524

2-81

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