RF2938 View Datasheet(PDF) - RF Micro Devices
Part Name
Description
MFG CO.
'RF2938' PDF : 20 Pages View PDF
RF2938
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
J1
RX IF IN
J2
TX IF IN
VCC
VCC
PD
R6
0Ω
C14
100 pF
VGC
C10
10 nF
48 47 46
R7
10 Ω
C15
100 pF
R4
10 kΩ
C11
10 nF
C19
22 nF
45 44 43 42 41 40
C18
22 nF
NOTES:
1) R4 is used to set the bandwidth of the GMC Filters.
2) Pins 14 through 22 contain 2.4 GHz signals. Place tuning/bypass components
as close as possible. Make all lines on these pins 50 Ω.
3) For normal operation, move C33 to C38 and install all components with an
asterisk.
*Do not populate.
50 Ω µstrip
39 38 37
C17
8 pF
J15
RSSI
RX EN
TX EN
VCC
R5
10 Ω
50 Ω µstrip
C4
100 pF
R3*
0Ω
R10*
0Ω
50 Ω µstrip
50 Ω µstrip
L2
150 nH
C13
100 pF
C36
C3
2 pF
100 pF
L9
68 nH
GC TX
J3
IF LO
VCC
C21
22 nF
50 Ω µstrip
C25
C7
1 pF
100 pF
L6
27 nH
C16
22 nF
VCC
P1
P1-1
C9
10 nF
+ C12
4.7 uF
P1-3
1 VCC
2 GND
3 GC TX
CON3
P2
P3
P2-1 1 TX EN
P3-1 1 PD
2 GND
2 GND
P2-3 3 RX EN
CON3
P3-3 3 VGC
CON3
1
36
50 Ω µstrip
2
3
4
5
6
7
RX_EN
8
TX_EN
9
10
11
12
15 dB
IF Amp
-15 dB to
35 dB Gain
15 dB
Gain Range
15 dB
+45
Β2 °
-45°
35
34
33
I
32
Q
31
Baseband Amp
Active Selectable
LPF (fc=1 MHz to 40 MHz)
30
0-30 dB Gain
29
Active Selectable
I LPF (fc=1 MHz to 40 MHz)
28
Q
27
26
Σ
25
50 Ω µstrip
50 Ω µstrip
50 Ω µstrip
C20
22 nF
C2
10 nF
C1
10 nF
C6
0.1 uF
C5
0.1 uF
50 Ω µstrip
50 Ω µstrip
R1
270 kΩ
13 14 15 16 17 18 19 20 21 22 23 24
2938400, Rev
-
R8
1 kΩ
L8
39 nH
C34
22 nF
50 Ω µstrip
L1
2.7 nH
C23
22 nF
C26
12 pF
C24
22 nF
C27
2 pF
C22
22 nF
50 Ω µstrip
50 Ω µstrip
C28
22 pF
L3
3.9 nH
C29
3 pF
50 Ω µstrip
50 Ω µstrip
L7
220 nH
C38*
5 pF
C31
3 pF
C32
3 pF
C30
22 pF
50 Ω µstrip
C33
5 pF
FL1*
SAWTEK
855392
L4
3.9 nH
J4
PA OUT
VCC
J5
PA IN
VCC
J6
RF LO
C25
22 nF
J14
Q DATA
J13
Q OUT
J12
I DATA
J11
I OUT
VCC
J10
Q IN
J9
I IN
VCC
J8
IF OUT
J7
RF OUT
11
Rev A8 010418
2-13
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