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RF2890
Rev A4 040421
Application Schematic
GPS LC Filter
CDMA IF SAW Filter
33 nF
33 nH
33 nF
1.8 nH
1.2 pF
G1
4.7 nH
10 pF
22 nH
30
Ω
33 nF
33 nF
15 nH
TX BUFF
ENAB
ENABLE
DIV
SEL
33 nF
33 nF
33 nH
16 k
Ω 7.5 kΩ
1
3
2
6
24
23
22
21
20
19
4
5
12
18
15
17
16
14
13
10
9
7
8
11
/2
5.6 nH
33 nF
V
CC
CELL LNA IN
DNI
GPS LNA IN
GPS
RF
SAW
G2
BAND
SEL
V
CC
V
CC1
LO IN
V
CC2
LO OUT
33 nH
CELL
RF
SAW
L5
(0603
Wire-wound
Coilcraft)
L6
(0603
Wire-wound
Coilcraft)
V
CC
R1
C7
C8
C9
L7
(0603
Wire-wound
Coilcraft)
CDMA IF
(IFSAW1)
SAW
CDMA
L1
(0603
Wire-wound
Coilcraft)
L2
(0603
Wire-wound
Coilcraft)
V
CC
R1
C1
C2
GPS
8.2 nH
10 nH
6.2 pF
0
Ω
0
Ω
IF Frequency
CDMA IF OUTPUT
184 MHz
85 MHz
C7
1.8 pF
22 pF
R1
DNI
DNI
L5
68 nH
68 nH
L6
68 nH
68 nH
C8
5.6 pF
7.5 pF
C9
5.6 pF
7.5 pF
L7
47 nH
270 nH
IF SAW 1
EPCOS B4955
LG LG0085G2
IF Frequency
GPS IF OUTPUT
184 MHz
C1
DNI
R1
10 k
Ω
L1
330 nH
L2
220 nH
C2
5.6 pF
C3
9 pF
L3
82 nH
C4
10 nF
C5
9 pF
L4
82 nH
C6
1 nF
C3
L3
(0603
Wire-wound
Coilcraft)
C4
C5
C6
Note 1: L3, L4, L5, L6, and L7 may be substituted with 0402 wire-wound inductors of the same value.
Note 2: For single-ended configurations, C3 and C6 are removed.
Note 3: L1 and L2 must be 0603 wire-wound inductors to achieve datasheet performance.
Note 4: If system specifications allow the removal of the GPS RF SAW Filter, see diagram below for
pin 6 and pin 7 connections.
*Note 4
6
7
4.7 nH
10 pF
22 nH
30
Ω
33 nF
33 nF
15 nH
V
CC
8.2 nH
L4
(0603
Wire-wound
Coilcraft)
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