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ATA5743 Datasheet(PDF) 7 Page - ATMEL Corporation

Part # ATA5743
Description  UHF ASK/FSK Receiver
Download  43 Pages
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Manufacturer  ATMEL [ATMEL Corporation]
Direct Link  http://www.atmel.com
Logo ATMEL - ATMEL Corporation

ATA5743 Datasheet(HTML) 7 Page - ATMEL Corporation

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


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