TDA6508 Datasheet, PDF (30/42 Pages) NXP Semiconductors – 3-band mixer/oscillator and PLL for terrestrial tuners

Philips Semiconductors
3-band mixer/oscillator and PLL for
terrestrial tuners
Product specification
TDA6508; TDA6508A;
TDA6509; TDA6509A
unwanted
handbook, full pagewidth ^signal
50 Ω source
AC
AM = 30%
eu
HYBRID
AC
Vi HYBRID
50 Ω
BD
wanted
ew
signal
source
50 Ω
BD
50 Ω
HIGH_RFIN1
IFAMP_OUT1
D.U.T.
HIGH_RFIN2
27 Ω
18 dB
attenuator
FILTER
38.9 MHz
Vo
V Vo(meas)
RMS
voltmeter
modulation
analyzer
50 Ω
MDB252
V_o = V_o(meas) + 3.75 dB.
Wanted output signal at picture carrier frequency f_RF(w); V_o(w) = 100 dBµV.
Unwanted output signal at sound sub-carrier frequency f_RF(u); AM = 30%; AF = 2 kHz.
We measure the level of unwanted signal causing 0.3% AM modulation in the wanted signal
f_RF(w) = 439.25 MHz (min.); 863.25 MHz (max.).
f_RF(u) = 444.75 MHz (min.); 868.75 MHz (max.).
f_osc = 478.15 MHz (min.); 902.15 MHz (max.).
Fig.26 Cross-modulation measurement in the HIGH-band of the TDA6508A; TDA6509A.
2005 Mar 25
30