TDA6500 Datasheet, PDF (30/37 Pages) NXP Semiconductors – 5 V mixer/oscillator and synthesizer for PAL and NTSC standards

Philips Semiconductors
TDA6500; TDA6501
5 V mixer/oscillator and synthesizer for PAL and NTSC standards
AM = 30%
50 Ω 2 kHz
A
C
unwanted
e_u
signal
source
HYBRID
50 Ω
B
D
wanted
e_w
signal
source
50
Ω
A
C
HYBRID
B
D
50
Ω
MHBIN1 IFOUT
DUT
MHBIN2
FILTER
12 dB
L
attenuator
V_o
C
V V_meas
38.9 MHz
(PAL & OFDM)
50
Ω
RMS
voltmeter
fce829
V_o = V_meas × --------------⁵---⁰-------------- = V_meas + attenuation
50² + L²Ï‰²
Wanted output signal at f_RFpix; V_o = 100 dBµV.
Unwanted output signal at f_RFpix + 5.5 MHz.
The level of unwanted signal is measured by causing 0.09 % AM modulation in the wanted signal.
PAL: IF = 38.9 MHz; L = 680 nH; C = 25.9 pF and attenuation = 10.2 dB
Fig 15. Cross modulation measurement in mid and high bands
signal
50 Ω source
A
C
e
V_meas V
50
Ω
V_i ^HYBRID
50
RMS
Ω
voltmeter
B
D
MHBIN1 IFOUT
DUT
C
MHBIN2
L
spectrum
analyzer
50 Ω
fce220
Loss in hybrid = 1 dB.
V_i = V_meas − loss.
PAL: IF = 38.9 MHz; L = 680 nH; C = 25.9 pF
Fig 16. Maximum RF input level without lock-out in mid and high bands
9397 750 15057
Product data sheet
Rev. 02 — 14 June 2005
© Koninklijke Philips Electronics N.V. 2005. All rights reserved.
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