ATA3742_07 ATMEL [ATMEL Corporation], ATA3742_07 Datasheet - Page 6

• Manufacturer Part Number: ATA3742_07
• Description: UHF ASK/FSK Receiver
• Manufacturer: ATMEL [ATMEL Corporation]

Figure 3-2.
Figure 3-3.
6
RF
f
ATA3742
RF
IN
= 433.92 MHz
8.2 pF
f
RF
Input Matching Network With SAW Filter
Input Matching Network Without SAW Filter
22 pF
RF
IN
C
C
= 433.92 MHz
3
2
15 pF
TOKO ® LL2012
3.3 pF
F33NJ
33 nH
22 nH
L
2
Please note that for all coupling conditions (see
tivity of the LNA ground is compensated. C
bond wire. L = 25 nH is a feed inductor to establish a DC path. Its value is not critical but must be
large enough not to detune the series resonance circuit. For cost reduction, this inductor can be
easily printed on the PCB. This configuration improves the sensitivity of the receiver by about
1 dB to 2 dB.
L
25 nH
1
2
TOKO ® LL2012
IN
IN_GND
100 pF
25 nH
F22NJ
100 pF
8
9
C
16
LNAGND
LNA_IN
27 nH
CASE_GND
ATA3742
3, 4
B3555
L
8
9
3
LNAGND
LNA_IN
7, 8
ATA3742
TOKO ® LL2012
OUT_GND
F27NJ
8.2 pF
C
OUT
17
5
6
RF
IN
f
RF
RF
47 pF
10 pF
f
RF
3
IN
C
= 315 MHz
C
3
2
= 315 MHz
forms a series resonance circuit together with the
33 pF
TOKO ® LL2012
Figure 3-2
3.3 pF
F82NJ
82 nH
L
39 nH
2
L
25 nH
1
2
and
TOKO ® LL2012
IN
IN_GND
100 pF
25 nH
F39NJ
Figure
100 pF
8
9
C
16
LNAGND
LNA_IN
47 nH
CASE_GND
ATA3742
3, 4
B3551
L
8
9
3
3-3), the bond wire induc-
LNAGND
LNA_IN
7, 8
ATA3742
TOKO ® LL2012
OUT_GND
F47NJ
22 pF
C
OUT
17
4900B–RKE–11/07
5
6