TDA6508 Datasheet, PDF (24/42 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
handbook, full pagewidth
NOISE
SOURCE
BNC
RIM
INPUT
CIRCUIT
LOW_RFIN or
MID_RFIN
IFAMP_OUT1
D.U.T.
27 Ω
NOISE
FIGURE
METER
MDB264
NF = f_meas − input circuit loss (dB).
Fig.14 Noise figure measurement in the LOW and MID-bands of the TDA6508A; TDA6509A.
handbook, full pagewidth unwanted
signal
50 Ω source
AC
AM = 30%
eu
HYBRID
50 Ω
BD
wanted
ew
signal
source
Vi
50 Ω
LOW_RFIN
IFAMP_OUT1
D.U.T.
IFAMP_OUT2
Vo
2x5
turns
FILTER
18 dB
attenuator
38.9 MHz
2
V Vo(meas)
turns
modulation
analyzer
50 Ω
N1/N2 = 5 RMS
voltmeter
MDB261
V_o = V_o(meas) + 15 dB (transformer ratio N1/N2 and transformer loss).
Wanted output signal at picture carrier frequency f_RF(w); V_o(w) = 110 dBµV.
Unwanted output signal at sound sub-carrier frequency f_RF(u); AM = 30%; AF = 2 kHz.
Measuring the level of unwanted signal causing 0.3% AM in the wanted signal.
f_RF(w) = 43.25 MHz (min); 161.25 MHz (max).
f_RF(u) = 48.75 MHz (min); 166.75 MHz (max).
f_osc = 82.15 MHz (min); 200.15 MHz (max.).
Fig.15 Cross-modulation measurement in the LOW-band of the TDA6508; TDA6509.
2005 Mar 25
24