TDA6650TT Datasheet, PDF (38/54 Pages) NXP Semiconductors – 5 V mixer/oscillator and low noise PLL synthesizer for hybrid terrestrial tuner (digital and analog)

NXP Semiconductors
TDA6650TT; TDA6651TT
5 V mixer/oscillator and low noise PLL synthesizer
NOISE
SOURCE
A
C
HYBRID
B
D
50 Ω
HBIN1 IFOUTA
DUT
27 Ω
NOISE
FIGURE
METER
HBIN2 IFOUTB
V_CCA
fce753
Loss in hybrid = 1 dB.
NF = NF_meas − loss.
Fig 22. Noise figure (NF) measurement in high band with asymmetrical IF output
50 Ω
e_u
AM = 30 %
1 kHz
unwanted
signal
source
50 Ω
e_w
wanted
signal
source
AC
HYBRID
BD
50 Ω
AC
HYBRID
BD
50 Ω
27 Ω
HBIN1 IFOUTA
10 dB
attenuator
FILTER
DUT
V_o
HBIN2 IFOUTB
V Vmeas
38.9 MHz
V_{CCA RMS}
voltmeter
modulation
analyzer
50 Ω
fce754
Wanted signal source at f_RFpix is 70 dBµV.
Unwanted output signal at f_snd.
The level of unwanted signal is measured by causing 0.3 % AM modulation in the wanted signal.
Fig 23. Cross modulation measurement in high band with asymmetrical IF output
AM = 30 %
50 Ω 1 kHz
unwanted
e_u
signal
source
AC
HYBRID
50 Ω
B
wanted
e_w
signal
source
D
50 Ω
AC
HYBRID
BD
50 Ω
HBIN1 IFOUTA
DUT
C
HBIN2 IFOUTB
transformer
6 dB
attenuator
FILTER
N1
V_o
N2 V V'meas
38.9 MHz
RMS
voltmeter
modulation
analyzer
50 Ω
fce794
V’_meas = V_o − (transformer ratio N1/N2 = 5 and loss)
The level of unwanted signal is measured by causing 0.3 % AM modulation in the wanted signal.
N1 = 10 turns.
N2 = 2 turns.
N1/N2 = 5.
Fig 24. Cross modulation measurement in high band with symmetrical IF output
TDA6650TT_6651TT_5
Product data sheet
Rev. 05 — 10 January 2007
© NXP B.V. 2007. All rights reserved.
38 of 54