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RF2421
Rev A6 001102
9
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
Pin
Function
Description
Interface Schematic
1NC
Not internally connected. This pin can be grounded.
2RF IN
RF Input. This pin is not DC blocked, and an external blocking capacitor
is recommended. The value depends on the frequency used.
3GND
Ground connection. Keep trace physically short and connect immedi-
ately to the ground plane for best performance.
4RF OUT
RF Output. This pin is not DC blocked, and an external blocking capac-
itor is recommended. The value depends on the frequency used.
See pin 2.
5NC
Not internally connected. This pin can be grounded.
6VDD
Power supply pin. An external RF bypass capacitor is recommended.
7G10
Control pin for the 10dB attenuator. This pin has an internal pull-down
resistor, so when the pin is not connected the attenuator will be turned
off.
8NC
Not internally connected. This pin can be grounded.
RF IN
RF OUT
G10
1
2
3
4
8
7
6
5
C1
100 pF
C2
100 nF
P1-1
P1-3
C3
100 pF
C4
100 pF
50
Ω µstrip
RF IN
J1
RF OUT
J2
50
Ω µstrip
P1-1
P1-3
P1
ATTN
GND
VDD
1
2
3
2421400 Rev A
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