TDA6650TT Datasheet, PDF (33/55 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
LBIN
or
MBIN
IFOUTA
DUT
C
IFOUTB
6 dB
transformer ^attenuator
FILTER
N1
V_o
N2 V _V'meas
38.9 MHz
RMS
voltmeter
modulation
analyzer
50 Ω
fce793
V’_meas = V_o − (transformer ratio N1/N2 = 5 and loss).
Wanted signal source at f_RFpix is 80 dBµV.
The level of unwanted signal V_o at f_snd is measured by causing 1%
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.
handbook, full pagewidth
signal
50 Ω source
A
C
e
Vmeas _V
50
Ω
Vi ^HYBRID
50
RMS
Ω
voltmeter
B
D
27 Ω
HBIN1 IFOUTA
spectrum
analyzer
DUT
Vo
50 Ω
HBIN2 IFOUTB
VCCA
FCE751
Loss in hybrid = 1 dB.
V_i = V_meas − loss = 70 dBµV.
V_o = V’_meas + 3.75 dB.
G_v = 20 log ^V-V----o-_i .
DVB-T and PAL.
IF = 38.9 MHz.
Fig.20 Gain (G_Va) measurement in high band with asymmetrical IF output.
2004 Mar 22
33