TDA6650TT Datasheet, PDF (32/55 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 pagewiBdtNh C
connector ^Cs
Lp
Cc
TL
Cp
to the IC
mixer input
BNC
connector _Ls
Lp
Cc
TL
Cp
to the IC
mixer input
MCE452
Schematic A.
Schematic B.
For f_RF = 50 MHz (Schematic A)
Loss = 0 dB.
Cs = 12 pF in parallel with a 0.8 pF to 8 pF trimmer.
Cp = 18 pF in parallel with a 0.8 pF to 8 pF trimmer.
Cc = 4.7 nF.
Lp = 8 turns, ∅ 5 mm, wire ∅ = 0.4 mm air coil
TL = 50 Ω semi rigid cable, length = 75 mm.
For f_RF = 300 MHz (Schematic B)
Loss = 0.5 dB.
Cp = 8.2 pF in parallel with a 0.8 pF to 8 pF trimmer.
Cc = 4.7 nF.
Ls = 2 turns, ∅ 1.5 mm, wire ∅ = 0.4 mm air coil.
Lp = 2 turns, ∅ 1.5 mm, wire ∅ = 0.4 mm air coil.
TL = 50 Ω semi rigid cable, length = 75 mm.
For f_RF = 150 MHz (Schematic A)
Loss = 0 dB.
Cs = 0.8 pF to 8 pF trimmer.
Cp = 0.4 pF to 2.5 pF trimmer.
Cc = 4.7 nF.
Lp = 4 turns, ∅ 4.5 mm, wire ∅ = 0.4 mm air coil
TL = 50 Ω semi rigid cable, length = 75 mm.
Fig.17 Input circuit for optimum noise figure in low and mid band.
AM = 30%
50 Ω
1 kHz
A
C
unwanted
e_u
signal
source
HYBRID
50 Ω
B
D
wanted
e_w
signal
source
LBIN
or IFOUTA
MBIN
DUT
27 Ω
V_o
10 dB
attenuator
FILTER
V ^Vmeas
38.9 MHz
IFOUTB
50
Ω
V_CCA
RMS
voltmeter
modulation
analyzer
50 Ω
fce749
V_o = V_meas + 3.75 dB.
Wanted signal source at f_RFpix is 80 dBµV.
Unwanted output signal at f_snd.
The level of unwanted signal is measured by causing 1% AM modulation in
the wanted signal.
Fig.18 Cross modulation measurement in low and mid band with asymmetrical IF output.
2004 Mar 22
32