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TDA6650TT Datasheet, PDF (36/54 Pages) NXP Semiconductors – 5 V mixer/oscillator and low noise PLL synthesizer for hybrid terrestrial tuner (digital and analog) | |||
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NXP Semiconductors
TDA6650TT; TDA6651TT
5 V mixer/oscillator and low noise PLL synthesizer
AM = 30 %
50 â¦
1 kHz
A
C
unwanted
eu
signal
source
HYBRID
50 â¦
B
D
wanted
ew
signal
source
LBIN
or IFOUTA
MBIN
DUT
27 â¦
Vo
10 dB
attenuator
FILTER
V Vmeas
38.9 MHz
IFOUTB
50 â¦
VCCA
RMS
voltmeter
modulation
analyzer
50 â¦
fce749
Vo = Vmeas + 3.75 dB.
Wanted signal source at fRFpix is 80 dBµV.
Unwanted output signal at fsnd.
The level of unwanted signal is measured by causing 0.3 % AM modulation in the wanted signal.
Fig 18. Cross modulation measurement in low and mid band with asymmetrical IF output
AM = 30 %
50 ⦠1 kHz
unwanted
eu
signal
source
AC
HYBRID
50 â¦
BD
wanted
ew
signal
source
LBIN
or
MBIN
IFOUTA
DUT
C
IFOUTB
50 â¦
6 dB
transformer attenuator
FILTER
N1
Vo
N2 V V'meas
38.9 MHz
RMS
voltmeter
modulation
analyzer
50 â¦
fce793
Vâmeas = Vo â (transformer ratio N1/N2 = 5 and loss).
Wanted signal source at fRFpix is 80 dBµV.
The level of unwanted signal Vo at fsnd is measured by causing 0.3 % AM modulation in the wanted output signal.
N1 = 10 turns.
N2 = 2 turns.
N1/N2 = 5.
Fig 19. Cross modulation measurement in low and mid band with symmetrical IF output
TDA6650TT_6651TT_5
Product data sheet
Rev. 05 â 10 January 2007
© NXP B.V. 2007. All rights reserved.
36 of 54
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