T5744 – Rainbow Electronics T5744 User Manual
Page 5
5
T5744
4521A–RKE–02/02
Figure 5 shows a typical input matching network for f
RF
= 315 MHz and f
RF
=
433.92 MHz using a SAW. Figure 6 illustrates the input matching to 50
Ω
without a
SAW. The input matching networks shown in Figure 6 are the reference networks for the
parameters given in the electrical characteristics.
Table 1. Calculation of LO and IF Frequency
Figure 5. Input Matching Network with SAW Filter
Conditions
Local Oscillator Frequency
Intermediate Frequency
f
RF
= 315 MHz, MODE = 0
f
LO
= 314 MHz
f
IF
= 1 MHz
f
RF
= 433.92 MHz, MODE = 1
f
LO
= 432.92 MHz
f
IF
= 1 MHz
300 MHz < f
RF
< 365 MHz, MODE = 0
365 MHz < f
RF
< 450 MHz, MODE = 1
f
LO
f
RF
1
1
314
----------
+
-------------------
=
f
IF
f
RF
314
----------
=
f
LO
f
RF
1
1
432.92
------------------
+
----------------------------
=
f
IF
f
RF
432.92
------------------
=
IN
IN_GND
OUT
OUT_GND
CASE_GND
B3555
T5744
C3
22p
L
25n
C16
100p
C17
8.2p
L3
TOKO LL2012
F27NJ
27n
C2
8.2p
L2
TOKO LL2012
F33NJ
33n
1
2
3,4 7,8
5
6
8
9
RF
IN
f
RF
= 433.92 MHz
LNAGND
LNA_IN
IN
IN_GND
OUT
OUT_GND
CASE_GND
B3551
T5744
C3
47p
L
25n
C16
100p
C17
22p
L3
TOKO LL2012
F47NJ
47n
C2
10p
L2
TOKO LL2012
F82NJ
82n
1
2
3,4 7,8
5
6
8
9
f
RF
= 315 MHz
LNAGND
LNA_IN
RF
IN