u3742bm ATMEL Corporation, u3742bm Datasheet - Page 6

• Manufacturer Part Number: u3742bm
• Description: Uhf Ask/fsk Receiver
• Manufacturer: ATMEL Corporation

Figure 5. Input Matching Network with SAW Filter
Figure 6. Input Matching Network without SAW Filter
6
U3742BM
RF
RF
f
f
RF
IN
RF
IN
= 433.92 MHz
= 433.92 MHz
C
8.2p
2
15p
C
22p
3
3.3p
TOKO LL2012
F33NJ
33n
22n
L
2
TOKO LL2012
L
25n
25n
2
1
100p
F22NJ
IN
IN_GND
Table 1. Calculation of LO and IF Frequency
Conditions
f
f
300 MHz < f
365 MHz < f
RF
RF
8
9
= 315 MHz, MODE = 0
= 433.92 MHz, MODE = 1
8
9
100p
C
CASE_GND
16
LNAGND
U3742BM
LNA_IN
3, 4
LNAGND
LNA_IN
U3742BM
B3555
27n
L
3
7, 8
RF
RF
OUT_GND
TOKO LL2012
< 365 MHz, MODE = 0
< 450 MHz, MODE = 1
F27NJ
C
8.2p
OUT
17
5
6
RF
RF
f
IN
RF
IN
= 315 MHz
f
RF
10p
C
C
2
33p
47p
= 315 MHz
3
Local Oscillator
Frequency
f
f
3.3p
f
f
LO
LO
LO
LO
TOKO LL2012
= 314 MHz
= 432.92 MHz
F82NJ
82n
39n
=
=
L
2
------------------- -
1
--------------------------- -
1
+
+
TOKO LL2012
f
25n
RF
L
25n
--------- -
314
f
----------------- -
432.92
2
1
100p
RF
F39NJ
1
1
IN
IN_GND
8
9
8
9
100p
CASE_GND
C
U3742BM
LNAGND
LNA_IN
16
LNAGND
LNA_IN
3, 4 7, 8
U3742BM
B3551
47n
L
3
OUT_GND
Intermediate Frequency
f
f
TOKO LL2012
f
f
IF
IF
IF
IF
F47NJ
= 1 MHz
= 1 MHz
22p
=
=
C
OUT
17
--------- -
314
----------------- -
432.92
f
LO
f
LO
5
6
4735A–RKE–11/03