Manual

3
AT86RF401
1424D–RKE–09/02
Figure 3. Sample Circuit
Table 1. Recommended Parts List
Part Number
Value
(Common)
Value
(315 MHz)
Value
(433.92 MHz)
Value
(Ext. Loop Filter) Specification
B1 3.6V CR2032, Li Battery
C1 0.01 µF 0603, X7R, ± 10%
C2 100 pF 0603, COG, ± 5%
C3 Antenna Dependent Antenna Dependent Antenna Dependent 0603, COG, ± 0.1 pF
C4 Not req’d Not req’d Frequency Dependent 0603, COG, ± 5%
C5 Not req’d Not req’d Frequency Dependent 0603, COG, ± 0.25 pF
L1 82 nH 39 nH Frequency Dependent 1608, ± 5%
R1 Not req’d Not req’d Frequency Dependent 0603, ± 5%
S1 Switch SPST
S2 Switch SPST
S3 Switch SPST
U1 AT86RF401 20-lead TSSOP
Y1 13.125 MHz 18.08 MHz Frequency Dependent
13.125 MHz:
Crystek
™
P/N 016757
18.080 MHz:
Crystek P/N 016758
ANTB
LOOPFIL
L1
L2
RESETB
NC
IO0/SDI
IO1/SDO
IO2/SCLK
XTAL/CLK
ANT
CFIL
AVDD
DVDD
AGND
DGND
IO5
IO4
IO3
XTALB
S1
S2 S
3
Y1
RESET SDO
SDI
SCLK
U1
V+
C3
1
2
3
4
5
6
7
8
9
10
20
19
18
17
16
15
14
13
12
11
R1
C4
C5
V+
C2
C1 B1
SPI Programming Interface
L1
EXTERNAL LOOP FILTER (OPTIONAL)