TDA6508 Datasheet, PDF (28/42 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
signal
50 Ω source
e
Vi(meas) _V
50 Ω
RMS
voltmeter 50 Ω
A
C
HYBRID
B
D
HIGH_RFIN1
IFAMP_OUT1
27 Ω
Vi
D.U.T.
Vo Vo(meas)
HIGH_RFIN2
spectrum
analyzer
50 Ω
MDB258
Hybrid loss = 1 dB.
V_i = V_i(meas) − loss = 70 dBµV.
V_o = V_o(meas) + 3.75 dB.
G_v = 20 log -VV----^o-_i
PAL f_IF = 36.15 MHz.
Fig.22 Gain measurement in the HIGH-band of the TDA6508A; TDA6509A.
NOISE
SOURCE
AC
HYBRID
50 Ω
BD
HIGH_RFIN1
IFAMP_OUT1
D.U.T.
IFAMP_OUT2
HIGH_RFIN2
2x5
turns
NOISE
METER
2
turns
N1/N2 = 5
mdb255
Hybrid loss = 1 dB.
NF = NF_meas − hybrid loss.
Fig.23 Noise figure measurement in the HIGH-band of the TDA6508; TDA6509.
2005 Mar 25
28