TDA5736 Просмотр технического описания (PDF) - Philips Electronics

Номер в каталоге

Компоненты Описание

производитель

TDA5736

TDA5736; TDA5737 5 V VHF, hyperband and UHF mixers/oscillators for TV and VCR 3-band tuners

Philips Electronics 

Philips Semiconductors

5 V VHF, hyperband and UHF mixers/oscillators

for TV and VCR 3-band tuners

Product specification

TDA5736; TDA5737

handbook, full pagewidth unwanted

signal

50 Ω source

AC

AM = 30%

eu

HYBRID

50 Ω

BD

wanted

ew

signal

source

RFA

IF

out

VIMA

50

Ω

D.U.T.

IF

out

Vo

2x5

turns

FILTER

18 dB

attenuator

33.9 MHz

2

V V'meas

turns

N1/N2 = 5 RMS

voltmeter

modulation

analyzer

50 Ω

MGE972

V’meas = Vo − 15.4 dB (transformer ratio N1/N2 = 5 and transformer loss).

Wanted output signal at fRFW = 50 MHz (170 MHz); Vow = 80 dBµV.

We measure the level of the unwanted signal Vou causing 1% AM modulation in the wanted output signal; fRFU = 45.5 MHz (165.5 MHz);

fosc = 83.9 MHz (203.9 MHz).

Vou = V’meas + 15.4 dB.

Filter characteristics: fc = 33.9 MHz, f−3dBBW = 1 MHz; f−30dBBW = 2.3 MHz.

Fig.7 Cross modulation measurement in band A.

handbook, full pagewidth DC supply

VP

6.8 kΩ

100 µF

100 µF

ripple

signal

47 Ω

REFERENCE

MEASUREMENT

SET-UP

OF FIG. 17

WITHOUT

L10, C25, C35, C26

to

spectrum

analyser

53.5 dBc

−500 kHz fo

+500 kHz MGE974

The ripple susceptibility is defined as the level of a signal added to the supply voltage causing sidebands in the LO output at 53.5 dBc.

This signal has a frequency between 20 Hz and 500 kHz.

Fig.8 Ripple susceptibility.

1997 Feb 24

12

Share Link: