TDA6502 Datasheet, PDF (25/44 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
NOISE
SOURCE
BNC
RIM
INPUT
CIRCUIT
VHFIN IFOUT
D.U.T.
27 Ω
NOISE
FIGURE
METER
FCE579
NF = NF_meas − loss (of input circuit) (dB).
Fig.14 Noise figure (NF) measurement in VHF band.
handbook, full pagewidth
50 Ω
AM = 30%
2 kHz
unwanted
eu
signal
source
A
C
HYBRID
50 Ω
B
D
wanted
ew
signal
source
VHFIN IFOUT
D.U.T.
50
Ω
27 Ω
18 dB
attenuator
FILTER
45.75 MHz
Vo
V Vmeas
modulation
analyzer
50 Ω
RMS
voltmeter
FCE580
V_o = V_meas × ^{5----0---5--+}-0----2---7--
Wanted output signal at f_RF(w) = 55.25 (361.25) 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) = 59.75 (366.75) MHz.
f_OSC = 101 (407) MHz.
Filter characteristics: f_c = 45.75 MHz, f_{−3 dB(BW)} = 1.4 MHz, f_{−30 dB(BW)} = 3.1 MHz.
Fig.15 Cross modulation measurement in VHF band.
2000 Mar 16
25