TDA5745 Просмотр технического описания (PDF) - Philips Electronics
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TDA5745 Datasheet PDF : 20 Pages
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Philips Semiconductors
Low power mixers/oscillators for
hyperband tuners
Preliminary specification
TDA5744; TDA5745
handbook, full pagewidth
Vmeas V
50 Ω
unwanted
signal
50 Ω source
AC
AM = 30%
eu
HYBRID
RMS
voltmeter
VHFIN IFOUT1
Vi
D.U.T.
T
(1)
Vo
N1
C
(2)
N2
FILTER
18 dB
attenuator
38.9 MHz
V V'meas
modulation
analyzer
50 Ω
50 Ω
BD
wanted
ew
signal
source
50 Ω
IFOUT2
RMS
voltmeter
MGL275
(1) N1 is 2 × 5 turns.
(2) N2 is 2 turns.
Zi >> 50 Ω ⇒ Vi = 2 × Vmeas; V’meas = Vo − 16 dB (transformer ratio NN-----12-- = 5 and transformer loss).
Wanted input signal Vi = 80 dBµV at wanted fRF = 45.25 MHz (399.25 MHz).
Measured level of the unwanted output signal Vou causing 1% AM modulation in the wanted output signal;
unwanted fRF = 50.75 MHz (404.75 MHz); Vou = V’meas + 16 dB.
Fig.6 Cross modulation measurement in the VHF band.
handbook, full pagewidth
Vmeas V
50 Ω
unwanted
signal
50 Ω source
AC
AM = 30%
eu
HYBRID
RMS
voltmeter
AC
Vi
HYBRID
50 Ω
B
wanted
ew
signal
source
D
50
Ω
BD
50
Ω
UHFIN1 IFOUT1
D.U.T.
T
(1)
(2)
Vo N1
N2
C
FILTER
18 dB
attenuator
38.9 MHz
V
UHFIN2 IFOUT2
RMS
voltmeter
modulation
analyzer
50 Ω
MGL276
(1) N1 is 2 × 5 turns.
(2) N2 is 2 turns.
Vi = Vmeas; V’meas = Vo − 16 dB (transformer ratio NN-----12-- = 5 and transformer loss).
Wanted input signal Vi = 70 dBµV at fRF = 407.25 MHz (855.25 MHz).
Measured level of the unwanted output signal Vou causing 1% AM modulation in the wanted output signal;
unwanted fRF = 412.75 MHz (860.75 MHz); Vou = V’meas + 16 dB.
Fig.7 Cross modulation measurement in the UHF band.
1998 Mar 09
10
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