RF8889A Datasheet, PDF (18/26 Pages) RF Micro Devices – SP10T ANTENNA SWITCH MODULE

RF8889A
Evaluation Board Schematic
GND
12
V4
34
V3
V2
56
V1
P1
HDR_2X3_RA
J1
TRx3
TRX3
GND
J2
TRX4
TRx4
J3
TRx5
TRX5
GND
J4
ANT
ANT
VDD
V4
C3
100pF
GND
V3
C4
100pF
GND
V2
C5
100pF
GND
V1
C6
100pF
GND
GND
U1
C7
10nF
GND
C1
100pF
GND
1
3mmX3.8mm, 26pin, QFN
GND
2 _TRx3
3 _TRx4
4 _TRx5
GND ⁵ GND
GND ⁶ GND
7 _ANT
8 _GND
L1
56nH
GND
GND
GND
GND
GND ²¹
TRx2 ²⁰
TRx1 ¹⁹
Rx1 ¹⁸
Rx2 ¹⁷
GND ¹⁶ GND
Rx3 ¹⁵
GND ¹⁴
GND
TRx2
J11
TRX2
TRx1 ^GND J10
TRX1
GND
Rx1
J9
RX1
Rx2
J8
RX2
GND
Rx3
J7
RX3
J5
Tx2
TX2
Tx1
J6
TX1
GND
GND
Application Environment
Decoupling capacitors on the control pins protect the control circuitry from possible RF leakage. As a good engineering prac-
tice, RF8889A evaluation board uses 100pF decoupling capacitors on the control lines, however these capacitors may require
optimization based on the application. The use of these capacitors is routing dependent and in some applications, decoupling
capacitors may not be required at all. A 10nF decoupling capacitor is recommended on the VDD line.
The value of L1 & C1 will depend on the Contact Discharge rating which needs to be achieved for a particular application. As
contact discharge testing is very sensitive to grounding and proximity of the DUT to the antenna, it is difficult to specify contact
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