9-21
RF2425
Rev A1 010228
9
Evaluation Board Schematic
(Download Bill of Materials from www.rfmd.com.)
Pin
Function
Description
Interface Schematic
1IN1
Input pin for Channel 1. Channel 1 is chosen with a logic level “Low” on
pin 6, CTRL. The input VSWR is 1:1 when this channel is active and
highly capacitive (open circuit) when this channel is inactive. Since
both channels of the switch are bidirectional, this pin may be used as
an output with OUT1 as its input depending on layout preference.
2GND
Ground connection. Keep traces physically short and connect immedi-
ately to the ground plane for best performance.
3VDD
Power supply. An external RF bypass capacitor is recommended.
4OUT2
Output pin for Channel 2. This pin may be used as the channel 2 input
instead; see pin 5 description.
5IN2
Input pin for Channel 2. Channel 2 is chosen with a logic level “High”
on pin 6, CTRL. The input VSWR is 1:1 when this channel is active
and highly capacitive (open circuit) when this channel is inactive. Since
both channels of the switch are bidirectional, this pin may be used as
an output with OUT2 as its input depending on layout preference.
6CTRL
Control pin. This pin chooses which channel is active. A “Low” level
chooses Channel 1; a “High” level chooses Channel 2. CMOS logic
may be used to drive the control input.
7GND
Same as pin 2.
8OUT1
Output pin for Channel 1. This pin may be used as the channel 1 input
instead; see pin 1 description.
1
2
3
4
8
7
6
5
C1
15 pF
C4
15 pF
C3
15 pF
C2
15 pF
50
Ωµstrip
50
Ωµstrip
50
Ωµstrip
50
Ωµstrip
IN1
J1
OUT2
J2
VDD
C6
15 pF
C5
1
µF
CTRL
OUT1
J4
IN2
J3
2425400-
P1-1
P1-3
P1
VDD
GND
1
2
3
CTRL
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