TDA6650TT Datasheet, PDF (35/54 Pages) NXP Semiconductors – 5 V mixer/oscillator and low noise PLL synthesizer for hybrid terrestrial tuner (digital and analog)

NXP Semiconductors
TDA6650TT; TDA6651TT
5 V mixer/oscillator and low noise PLL synthesizer
NOISE
SOURCE
BNC
RIM
INPUT
CIRCUIT
LBIN
or
MBIN
IFOUTA
DUT
IFOUTB
27 Ω
NOISE
FIGURE
METER
V_CCA
fce750
NF = NF_meas − loss of input circuit (dB).
Fig 16. Noise figure (NF) measurement in low and mid band with asymmetrical IF output
BNC
connector ^Cs
Lp
Cc
TL
Cp
to the IC
mixer input
BNC
connector _Ls
Lp
Cc
TL
Cp
to the IC
mixer input
mce452
a. Schematic 1
b. Schematic 2
For f_RF = 50 MHz (Schematic 1)
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 = 150 MHz (Schematic 1)
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.
For f_RF = 300 MHz (Schematic 2)
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.
Fig 17. Input circuit for optimum noise figure in low and mid band
TDA6650TT_6651TT_5
Product data sheet
Rev. 05 — 10 January 2007
© NXP B.V. 2007. All rights reserved.
35 of 54