TDA6508 Datasheet, PDF (22/42 Pages) NXP Semiconductors – 3-band mixer/oscillator and PLL for terrestrial tuners

Philips Semiconductors
3-band mixer/oscillator and PLL for
terrestrial tuners
13 TEST AND APPLICATION INFORMATION
Product specification
TDA6508; TDA6508A;
TDA6509; TDA6509A
signal
50 Ω ^source
LOW_RFIN
IFAMP_OUT1
spectrum
V_o
V_o(meas)
analyzer
e
V_{i(meas) V}
50 Ω
V_i
D.U.T.
2x5
2
50 Ω
turns
turns
RMS
voltmeter
IFAMP_OUT2
GND
N1/N2 = 5
mdb265
Z_i >> 50 Ω ⇒ V_i = 2 × V_i(meas) = 80 dBµV.
V_i = V_i(meas) + 6 dB = 80 dBµV.
V_o = V_o(meas) + 15 dB (transformer ratio N1/N2 and transformer loss).
G_v = 20 log -VV----^o-_i
PAL f_IF = 36.15 MHz.
Fig.10 Gain measurement in the LOW-band of the TDA6508; TDA6509.
handbook, full pagewidth
signal
50 Ω source
e
Vi(meas) V
50 Ω
LOW_RFIN
IFAMP_OUT1
27 Ω
Vi
D.U.T.
Vo Vo(meas)
RMS
voltmeter
spectrum
analyzer
50 Ω
MDB266
Z_i >> 50 Ω ⇒ V_i = 2 × V_i(meas) = 80 dBµV.
V_i = V_i(meas) + 6 dB = 80 dBµV.
V_o = V_o(meas) + 3.75 dB.
G_v = 20 log -VV----^o-_i
PAL f_IF = 36.15 MHz.
Fig.11 Gain measurement in the LOW-band of the TDA6508A; TDA6509A.
2005 Mar 25
22