Micrel
J4
J1
MICRF218
IF BANDWIDTH
CONTROL
1
2
CON2
C1
NP
1
2
REFOSC
EXTERNAL REFERENCE
OSCILLATOR INPUT
VDD = WIDE BANDWIDTH
0V = NARROW BANDWIDTH
+3V
J2
RF IN
L4
100nH
C2
2.2pF
C3
33pF
L3
100nH
L2
3.9nH
+3V
C5
100nF
1
2
3
4
5
6
7
8
U1 MICRF218AYQS
RO1 RO2
GNDRF NC
ANT RSSI
GNDRF CAGC
VDD CTH
IF_BW SEL1
SEL0 DO
SHDN GND
16
15
14
13
12
11
10
9
JPR1
0 OHMS
JPR2
NP
C4
0.047μF
R1
NP
R2
NP
C5
4.7μF
Y1
9.8131MHz
TSDF1220W
Q1
R7
100k
Y2
12.1287MHz
TSDF1220W
Q2
R11
100k
Notes:
1. 0V = Common
2. VDD Input = 3.0 to 3.3V
3. Ref-Osc Control:
0V = 315 MHz Operation,
VDD = 390.1 MHz Operation
J3
+3V
L3
ZCB-0603
R3
NP
R5
100K
C7
NP
R4
0 OHMS
R8
10k
R6
10k
R9
10k
3.0 to 3.3V
3.0 to 3.3V
COM
SHDN
DO
REF-OSC CNTR
COM
1
2
3
4
5
6
7
NP = Not Placed
DATA OUT
R10
100k
+3V
Figure 4. Dual Frequency QR218BP_SWREF, 315 MHz and 390 MHz
November 2011
11
M9999-111111
(408) 944-0800
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