Datasheet

Power Connections www.ti.com
Input voltage V
S
±, Max
I
OUT
Output drive ±25 mA
3 Power Connections
The THS4531ADGKEVM is equipped with banana jacks for easy connection of power. The positive supply
input is labeled V
S
+. The negative supply input is labeled V
S
–. Ground is labeled GND.
3.1 Split-Supply Operation
To operate as split supply, apply the positive supply voltage to V
S
+, negative supply voltage to V
S
– , and
the ground reference from supply to GND.
3.2 Single-Supply Operation
To operate as single supply, connect jumper V
S
– to GND, and apply the positive supply voltage to V
S
+.
Inputs and outputs must be biased per data-sheet specifications for proper operation.
4 Input and Output Connections
The THS4531ADGKEVM is equipped with SMA connectors for easy connection of signal generators and
analysis equipment. As shipped, the EVM is configured for a gain of 1, split supply, single-ended input and
output with 50-Ω termination. For best results, signals must be routed to and from the EVM with cables
having 50-Ω characteristic impedance. V
IN+
(J2) is the input connector for single-ended input signals. V
OUT+
(J10) is the output connector for single-ended output signals. V
IN-
(J1) is not intended for use with single-
ended input signals and has C1 and R6 added to approximate the impedance of an ac-coupled 50-Ω
source and to balance the amplifier when V
IN+
is driven from an ac-coupled, 50-Ω source. The amplifier
converts the single-ended input to a differential signal at its output pins. A resistor network (R20, R21,
R24) and transformer on the amplifier's output convert the differential signal to single-ended, provides 2-
kΩ load to the amplifier when terminated in 50 Ω, and 50-Ω line impedance match at V
OUT+
. This results in
loss, and the overall gain is approximately –38 dB. See the following THS4531 data-sheet applications
section, schematics, and layouts for more detail and how to reconfigure the EVM.
2
THS4531ADGKEVM Evaluation Module SLOU356–December 2012
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