TDA6502 Datasheet, PDF (27/44 Pages) NXP Semiconductors – 5 V mixers/oscillators and synthesizers for cable TV and VCR 2-band tuners

Philips Semiconductors
5 V mixers/oscillators and synthesizers for
cable TV and VCR 2-band tuners
Preliminary specification
TDA6502; TDA6502A;
TDA6503; TDA6503A
handbook, full pagewidth
AM = 30%
50 Ω _{2 kHz}
unwanted
eu
signal
source
AC
HYBRID
50 Ω
BD
wanted
ew
signal
source
50 Ω
AC
HYBRID
BD
50 Ω
UHFIN IFOUT
D.U.T.
UHFIN
27 Ω
18 dB
attenuator
FILTER
45.75 MHz
Vo
V Vmeas
RMS
voltmeter
modulation
analyzer
50 Ω
FCE583
V_o = V_meas × ^{5----0---5--+}-0----2---7--
Wanted output signal at f_RF(w) = 367.25 (801.25) MHz; V_o(w) = 100 dBµV.
Measuring the level of the unwanted output signal V_o(u) causing 0.3% AM modulation in the wanted output signal; f_RF(u) = 371.25 (805.75) MHz.
f_OSC = 413 (847) MHz.
Filter characteristics: f_c = 45.75 MHz, f_{−3 dB(BW)} = 1.4 MHz, f_{−30 dB(BW)} = 3.1 MHz.
Fig.18 Cross modulation measurement in UHF band.
2000 Mar 16
27