MICRF500
Typical Application
Figure 2 shows an example of a transceiver with modulation
applied to the VCO. The VCO and matching components are
optimized for 915MHz, 120kbps data rate. The inductors and
trimming capacitors must have a good high frequency perfor-
mance.
Micrel
The varactor SMV1215-011 is a single variable capacitance
diode manufactured by Skyworks Solutions (formerly Alpha
Industries). The pin diode SMP1320 is also manufactured by
Skyworks Solutions.
C7
C8
4.7n
4.7n
C10
C12
R6
C9
1n
1n
C11
1n
1n
V DD
V DD
1k
44
43
42
41
40
39
38
37
36
35
34
R5
62 ?
R4
10 ?
VDD
R1
30 ?
1
IFGND
MIXER
VDD
33
C5
47p
C30
47p
VDD
C1
47p
R2
0 ?
IchOut
QchOut
2
3
4
IFVDD
ICHOUT
QCHOUT
MIXER
GND
LNA_C
RFGND2
32
31
30
C26
10n
C28
18p
L2
5.1n
ant-switch
D2
SMP1320-079
C38
R7
20k
L1
C13
4.7p
5
6
OSCVDD
OSCIN
MICRF500
44-pin LQFP
RFIN
RFVDD
29
28
C29
100p
L3
8.7n
C37
4p
ANT
D1
SMV1215
12n
R8
39k
R13
270k
C15
C16
39n
R9
R10
16k
7
8
9
10
OSCGND
GND
CMPOUT
CMPR
RFGND
RFOUT
PABIAS
PA_C
27
26
25
24
R14
2.2k
C25
470p
C35
47p
C4
47p
L4
5.6n
C36
1.5p
C33
47p
D3
SMP1320-079
3.3n
16k
MOD
DIGGND
11
23
C31
C32
Lock
C20
C19
470p
C18
100n
R11
100k
C17
68p
C34
10n
12
C22
7p
13
14 15
C23
1n
Det
4p to 10p
16
17
18
19
20
21
22
R3
39 ?
L5
10n
4.7p
C6
47p
R16
2.2k
V DD
6.8p
R12
6.8k
10MHz
C21
100p
C24
V DD
1n
RSSI
Figure 2. Application Circuit - Optimized for 915MHz. 120kbps
March 2003
7
MICRF500
相关PDF资料
MICRF501BLQ TR TXRX SGL 300-600MHZ 44-LQFP
MICRF505DEV1 KIT DEV RADIOWIRE 850-950MHZ
MICRF506DEV1 EVAL BOARD EXPERIMENTAL MICRF506
MICRF507YML TR TXRX FSK LOW PWR W/AMP 32MLF
MICRF600DEV1 KIT DEV RADIOWIRE 902-928MHZ
MK01-C SENSOR REED SPST-NO SMD
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MK02/0-1A66-500W SENSOR REED SPST-NO
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