tda6651tt/c3/s3 NXP Semiconductors, tda6651tt/c3/s3 Datasheet - Page 36

• Manufacturer Part Number: tda6651tt/c3/s3
• Description: 5 V Mixer/oscillator And Low Noise Pll Synthesizer For Hybrid Terrestrial Tuner Digital And Analog
• Manufacturer: NXP Semiconductors

NXP Semiconductors
TDA6650TT_6651TT_5
Product data sheet
Fig 18. Cross modulation measurement in low and mid band with asymmetrical IF output
Fig 19. Cross modulation measurement in low and mid band with symmetrical IF output
V
Wanted signal source at f
Unwanted output signal at f
The level of unwanted signal is measured by causing 0.3 % AM modulation in the wanted signal.
V’
Wanted signal source at f
The level of unwanted signal V
N1 = 10 turns.
N2 = 2 turns.
N1/N2 = 5.
o
meas
= V
e
e
50
50
u
w
meas
= V
e
e
50
50
u
w
o
AM = 30 %
+ 3.75 dB.
unwanted
wanted
source
source
1 kHz
signal
signal
(transformer ratio N1/N2 = 5 and loss).
AM = 30 %
unwanted
wanted
source
source
signal
signal
1 kHz
HYBRID
B
A
RFpix
RFpix
A
B
snd
HYBRID
C
D
.
is 80 dB V.
is 80 dB V.
o
at f
C
D
snd
50
is measured by causing 0.3 % AM modulation in the wanted output signal.
50
LBIN
or
MBIN
Rev. 05 — 10 January 2007
LBIN
or
MBIN
DUT
DUT
IFOUTB
IFOUTA
IFOUTB
IFOUTA
C
5 V mixer/oscillator and low noise PLL synthesizer
V
TDA6650TT; TDA6651TT
V
CCA
o
27
V
transformer
o
N1
voltmeter
RMS
N2
V
voltmeter
attenuator
V
RMS
V
10 dB
meas
attenuator
V'
6 dB
meas
38.9 MHz
FILTER
38.9 MHz
FILTER
modulation
analyzer
50
© NXP B.V. 2007. All rights reserved.
fce749
modulation
analyzer
50
fce793
36 of 54