TS7514 查看數據表（PDF） - STMicroelectronics

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TS7514

PROGRAMMABLE V.23 MODEM WITH DTMF

STMicroelectronics 

TS7514

TYPICAL APPLICATION INFORMATION

+5V

External

Signal

10µF

+

100nF

-5V

10µF

+

100nF

U.A.R.T.

ATxI V+ GNDD GNDA V-

RAO1

TxD

RxD

RAI1

C

O

N

T

M.C.U.

R

PRD

T

S

RTS

7

MC/BC

5

1

4 MOD/DTMF

ENP

ATO

RAI2

RAO2

WLO

O

DCD

RFO

1µF(*)

1.5kΩ

CTP 120Ω

(670 90003)

Transfo.

(EMT L 162)

270kΩ

100nF 39kΩ

To

Loudspea ker

Amplifier

L

S

EXTAL

ZCO

RDI

XTAL OUT XTAL IN

3.579MHz

(LS04)

4.7kΩ

(*) : RegulationRequired in France Only

+5V

L1/TPH1

TRISIL

(TPA 270A 18)

L2

TPH2

POWER SUPPLIES DECOUPLING AND LAYOUT CONSIDERATIONS

Power supplies to digital systems may contain high

amplitude spikes and other noise. To optimize per-

formances of the TS7514 operating in close prox-

imity to digital systems, supply and ground noise

should be minimized.

This involves attentionto powersupply design and

circuit board layout.

The power supplies should be bypassed with tan-

talum or electrolytic capacitors to obtain noise free

operation. These capacitors should be located

close to the TS7514. The electrolytic type capaci-

tors for improved high frequency performance.

Power supplies connections should be short and

direct. Ground loops should be avoided.

17/19

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