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RF2670
Rev A4 010820
10
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
C26
10 nF
C25
100 pF
C24
10 nF
C23
100 pF
C22
10 nF
C21
100 pF
P3-1
1
2
3
4
5
6
7
8
9
10
11
12
24
23
22
21
20
19
18
17
16
15
14
13
IN I-
IN I+
GND2
DCFB I
VCC2
GND3
IF OUT I
VCC3
I DATA
RSSI I
VIFEN
GND1
IN Q-
IN Q+
GND1
DCFB Q
VCC1
VGC
IF OUT Q
VREF
RSSI Q
Q DATA
BW SEL2
BW SEL1
C6
100 nF
C5
100 nF
C2
1nF
L1
10
µH
C1
220 pF
T1
50
Ω µstrip
J1
IIN
L2
10
µH
DCFB I
C9
220 nF
VCC
50
Ω µstrip
J2
IF OUT I
50
Ω µstrip
J3
I DATA
RSSI I
C13
68 pF
VIFEN
C8
100 nF
C7
100 nF
C3
1nF
L3
10
µH
C4
220 pF
T2
50
Ω µstrip
J4
QIN
L4
10
µH
DCFB Q
C10
220 nF
VCC
VGC
50
Ω µstrip
J5
IF OUT Q
VREF
C11
47 nF
RSSI Q
C12
68 pF
50
Ω µstrip
J6
Q DATA
BW SEL2
BW SEL1
C27
10
µF
2670400-
P5
1
2
3
P5-1
BW SEL2
GND
P5-3
BW SEL1
P4
1
2
3
P4-1
DCFB Q
GND
P4-3
VREF
P3
1
2
3
VCC
GND
P3-3
VGC
P2
1
2
3
P2-1
RSSI Q
GND
P2-3
RSSI I
P1
1
2
3
P1-1
VIFEN
GND
P1-3
DCFB I
L1-L4 and C1-C4 make two LPFs. The fc of the RF2670 is variable;
therefore the L and C components must be variable. The following
table gives recommended component values ("std" indicates standard
eval board value).
Desired BW
BW1, BW2
C1, C4 (pF) C2, C3 (pF)
L1-L4 (
µH)
700 kHz
1.4 MHz
2.8 MHz
7.0 MHz
00
01
10
11
330
220 (std)
100
33
1800
1000 (std)
470
180
22
10
4.7
2.2
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