ATA5743 ATMEL Corporation, ATA5743 Datasheet - Page 7

• Manufacturer Part Number: ATA5743
• Description: Ata5743 Uhf Ask/fsk Receiver
• Manufacturer: ATMEL Corporation

Figure 4-2.
Figure 4-3.
4839B–RKE–08/05
RF
f
IN
RF
= 433.92 MHz
f
RFIN
RF
22p
Input Matching Network with SAW Filter
Input Matching Network without SAW Filter
C3
= 433.92 MHz
TOKO LL2012
15p
C3
L2
22n
C17
1.5p
L
25n
33n
L3
Please notice that for all coupling conditions (see
inductivity of the LNA ground is compensated. C3 forms a series resonance circuit together with
the 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 to 2 dB.
2
IN
TOKO LL2012
L
25n
100p
C16
F22NJ
8
9
100p
1, 3, 4
C16
LNAGND
ATA5743
LNA_IN
B3760
GND
8
9
6, 7, 8
LNAGND
LNA_IN
ATA5743
TOKO LL2012
L3
68n
OUT
5
RF
f
RF
IN
= 315 MHz
RF
f
RF
IN
= 315 MHz
27p
C3
27p
C3
TOKO LL2012
C17
2.7p
Figure 4-2
47n
L2
47n
L3
L
25n
2
TOKO LL2012
IN
25n
L
100p
C16
F39NJ
and
8
9
100p
1, 3, 4
Figure
C16
LNAGND
ATA5743
LNA_IN
B3761
8
9
GND
LNAGND
LNA_IN
ATA5743
6, 7, 8
4-3), the bond wire
TOKO LL2012
ATA5743
120n
L3
OUT
5
7