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Preliminary
3-33
RF3322
Rev A2 010518
3
Evaluation Board Schematic
PCB Layout Considerations
The RF3322 evaluation board can be used as a guide for the layout in your application. Care should be taken in laying
out the RF3322 in other applications. The RF3322 will have similar results if the following guidelines are taken into con-
sideration:
•
Make sure underside of package is soldered to a good ground on the PCB.
•
Move C2, C9, C10, and C11 as close to T1 as possible.
•
Keep input and output traces as short as possible.
•
Ensure a good ground plane by using multiple vias to the ground plane.
Use a low noise power supply along with decoupling capacitors.
16
15
18
17
20
19
14
13
12
11
5
6
3
4
1
2
7
8
9
10
C3
1nF
C4
1nF
C7
220 pF
T2
4:1
C9
100 pF
Gain Control
and Serial Bus
Power
Control
C11
15 pF
C10
15 pF
R6
24
Ω
J7
RF OUT
VCC3
VCC2
C6
0.1
µF
T1
1:1
R5
75
Ω
R4
75
Ω
J2
RF IN
VCC1
C5
0.1
µF
CS
SDA
SCLK
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
R1
100 k
Ω
R2
100 k
Ω
VCC
NC
CS
SDA
SCLK
SHDN
TXEN
NC
NC
GND
GND
GND
GND
GND
GND
GND
GND
VCC
VCC
NC
NC
NC
NC
NC
NC
CS
SDA
J5-1
J3-1
SCLK
J1
J3
1
2
3
J1-6
TXEN
J4
1
2
3
VCC
GND
J5
1
2
3
J1-5
SHDN
J6
1
2
3
VCC
GND
JP1
1
2
VCC
GND
+
C2
1nF
L1 (Ferrite)
30
Ω
C1
10
µF
(10 V)
L3 (Ferrite)
30
Ω
L4 (Ferrite)
30
Ω
L5 (Ferrite)
30
Ω
L2 (Ferrite)
30
Ω
VCC
VCC1
VCC2
VCC3
Notes:
1. 4-layer board. 2nd layer is ground plane.
2. Place C5 and C6 as close to pin as possible.
3. C1 is tantalum, size code Y.
4. All other components are 0603 size.
5. Replace R6 with 0
Ω resistor if 75 Ω connector is used.
3322410-
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