TDA6650TT Datasheet, PDF (31/55 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
handbook, full pagewidth
signal
50 Ω source
e
Vmeas _V
50
Ω
RMS
voltmeter
LBIN
or
IFOUTA
MBIN
DUT
C
Vi
IFOUTB
transformer
N1
Vo
N2
V'meas
spectrum
analyzer
50 Ω
FCE748
Z_i >> 50 Ω → V_i = 2 × V_meas = 70 dBµV.
V_i = V_meas + 6 dB = 70 dBµV.
V_o = V’_meas + 15 dB (transformer ratio N2/N1 = 5 and transformer loss).
G_v = 20 log -VV----^o-_i .
N1 = 10 turns.
N2 = 2 turns.
N1/N2 = 5.
DVB-T and PAL.
IF = 38.9 MHz.
Fig.15 Gain (G_V) measurement in low and mid band with symmetrical IF output.
handbook, full pagewidth
NOISE
SOURCE
BNC
RIM
INPUT
CIRCUIT
LBIN
or
MBIN
IFOUTA
DUT
IFOUTB
27 Ω
NOISE
FIGURE
METER
VCCA
FCE750
NF = NF_meas − loss of input circuit (dB).
Fig.16 Noise figure (NF) measurement in low and mid band with asymmetrical IF output.
2004 Mar 22
31