SPDT RF SWITCH
TB-347 Evaluation Board Schematic Diagram
HSWA2-30DR+
IN
OUT
1
2
+VDD
GND
5
1
3
5
6
4
1
3
IC1
+
C3 C4
+
IC2
2
BP
R1
R2
SHDN
4
2
DC
SUPPLY
R6
C5
C6 R5
C1
C2
GND
20
19
18
17
16 GND
15
1
GND
14
GND
RF1
2
3
4
5
RF1
RF2
RF2
13
HSWA2-30DR+
Control 2
GND
2
1
4
3
GND
GND
GND
12
R3
11 GND
10
Control 1
GND
6
7
8
9
RF4
RF3
R4
CALLIBRATION
RF LINE
RF COM
Bill of Material
Qty
N#
C1
C2
DESCRIPTION
CAPACITOR TANTALUM 1206 1μF
CAPACITOR X7R 0402 0.01μF
1
1
3
2
2
2
2
CAPACITOR TANTALUM 1206 3.3μF
CAPACITOR 0603 NPO 100PF
RESISTOR 0603 10 MOHM
RESISTOR 0603 1 MOHM
RESISTOR 0603 10 KOHM
LDO VOLTAGE REGULATOR 3.3V
MAX8878
C3
C4, C5, C6
R3, R4
R1, R2
R5, R6
IC1
1
1
DUAL NON-INVERTED SCHMITT
IC2
TRIGGER SN74LVC2G17
TB-347
How to use evaluation Board TB-347
The Evaluation board TB-347 was designed to evaluate the electrical performance of the HSWA2-30DR+ SPDT
switch.
RF3 and RF4 SMA 50Ω connectors are connected through a 50Ω transmission line that is used to estimate the
evaluation board loss for de-embedding purposes. The transmission lines were designed using a coplanar wave-
guide with ground plane. For details, please see suggested PCB layout on Page 8. The number of vias surrounding
the switch is critical for obtaining the specified isolation.
The TB-347 operates from +2.7V to +6.5V applied to VDD connector. IC1 voltage regulator limits the supply voltage
to the switch to +3.3V. IC2 is a Schmitt trigger & buffer which prevents an overload of switch control inputs from high
level control signals (up to +5.5V) and prevents from noise and transient spikes during switching process.
The control connector is used for computer control mode or manual operation mode. In manual control mode connect
Control 1 and/or Control 2 to ground to set Control 1 and/or Control 2 to logic low, respectively. When jumpers are
removed, the digital control input pulled up to VDD for logic high.
For computer control mode the software & cable are supplied. The cable should be connected between computer
LPT port and evaluation board control connector.
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