TS7514 datasheet(17/19 Pages) STMICROELECTRONICS

17 / 19 page

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 power supply 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.

+5V

-5V

µF10µF

External

Signal

100nF

Loudspea ker

Amplifier

39k

Ω

270k

Ω

1.5k

Ω

µF

CTP 120

Ω

(670 90003)

(*)

L1/TPH1

TRISIL

(TPA 270A 18)

TPH2

Transfo.

(EMT L 162)

3.579MHz

(LS04)

4.7k

Ω

+5V

EXTAL

U.A.R.T.

M.C.U.

(*) : Regulation Required in France Only

TxD

RxD

PRD

RTS

MC/BC

MOD/DTMF

ENP

DCD

ZCO

XTAL OUT

XTAL IN

RDI

RFO

WLO

RAO2

RAI2

ATO

RAI1

RAO1

V+

ATxI

GNDD GNDA

V-

100nF

TYPICAL APPLICATION INFORMATION

TS7514

17/19

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