TDA6650TT Datasheet, PDF (35/55 Pages) NXP Semiconductors – 5 V mixer/oscillator and low noise PLL synthesizer for hybrid terrestrial tuner (digital and analog)

Philips Semiconductors
5 V mixer/oscillator and low noise PLL synthesizer
for hybrid terrestrial tuner (digital and analog)
Product specification
TDA6650TT;
TDA6651TT
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
27 Ω
HBIN1 IFOUTA
10 dB
attenuator
FILTER
DUT
V_o
V Vmeas
HBIN2 IFOUTB
V_CCA ^RMS
voltmeter
38.9 MHz
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 1% 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
A
C
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).
N1 = 10 turns.
N2 = 2 turns.
N1 / N2 = 5.
Fig.24 Cross modulation measurement in high band with symmetrical IF output.
2004 Mar 22
35