Alternatively, it can be populated with a 50 Ω resistor if applying a function generator output that needs a 50 Ω
termination. One of the inputs would be GND and the board would be operating in split supply in this situation.
Otherwise the pad can be left unpopulated.
+
–
0
0
0
0
IN- Sense
IN-
IN+
IN+ Sense
T
erm
ination
TLV360X
R1
R3
R2
R4
R5
Figure 6-3. Input Side Schematic
6.3 Outputs
R8 is known as the attenuation resistor, and is used to attenuate the output by setting the top half of a voltage
divider circuit, with the bottom half supplied by the load, such as an oscilloscope’s internal termination. It is not
advisable to populate with a low value resistor as the TLV3601 output cannot drive such a load as the amount
of current sourced would be significant. A 1 kΩ resistor is recommended for this footprint which, coupled with a
scope's internal 50 Ω termination creates an attenuation factor of 1:21 which can be rectified using oscilloscope
settings. A high speed probe may be used for measurement of the output, but rise and fall times may be limited.
+
–
Attenuation
OUT
TLV360X
R8
Figure 6-4. Output Side Block Diagram
Two types of output connections are supplied depending on the needed configuration. J5, an SMA connector,
can be populated or J10, a two-pin jumper, can be populated if using an active probe. If measuring the output
and input (via input sense connections J3 and J4), it is recommended to use length matched cables on the
output and sense lines to minimize distortion issues.
6.4 Hysteresis
The TLV3601 EVM is able to support both the TLV3601 and TLV3603 devices. A key difference between devices
is the way hysteresis is able to be applied.
The TLV3601 needs hysteresis applied through external components R6, a feedback resistor, and R1, a series
resistor for IN+. Necessary calculations for the hysteric window must be made to figure out the value of both
resistors.
Board Setup
SNOU183 – MAY 2021
TLV3601EVM User's Guide
9
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