TDA5744 Datasheet, PDF (11/20 Pages) NXP Semiconductors – Low power mixers/oscillators for hyperband tuners

Philips Semiconductors
Low power mixers/oscillators for
hyperband tuners
Preliminary specification
TDA5744; TDA5745
handbook, full pagewidth
BNC ^C1
L1
I1
PCB
plug
C2
RIM-RIM
(a)
I3
PCB
BNC ^C3
I2
plug
RIM-RIM
C4
(b)
MBE286 - 1
(a) For f_RF = 50 MHz:
VHF mixer frequency response measured = 57 MHz;
loss = 0 dB.
Image suppression = 16 dB.
C1 = 1 nF; C2 = 2.2 pF.
L1 = 7 turns (∅ 5.5 mm; wire ∅ = 0.5 mm).
I1 = semi rigid cable (RIM): 5 cm long.
(semi rigid cable (RIM); 33 dB/100 m; 50 Ω; 96 pF/m).
(b) For f_RF = 150 MHz:
VHF mixer frequency response measured = 150.3 MHz;
loss = 1.3 dB.
Image suppression = 13 dB.
C3 = 1 nF; C4 = 2.2 pF.
I2 = semi rigid cable (RIM): 30 cm long.
I3 = semi rigid cable (RIM): 5 cm long.
(semi rigid cable (RIM); 33 dB/100 m; 50 Ω; 96 pF/m).
Fig.8 Input circuit for optimum noise figure in the VHF band.
handbook, full pagewidth
NOISE
SOURCE
BNC
RIM
INPUT
CIRCUIT
VHFIN IFOUT1
D.U.T.
IFOUT2
T
C
NOISE
FIGURE
METER
MGL277
F = F_meas − loss (of input circuit) (dB).
Fig.9 Noise figure (F) measurement in the VHF band.
1998 Mar 09
11