Setup Procedure
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4
SLOU454 – June 2016
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Copyright © 2016, Texas Instruments Incorporated
LMH2832EVM-50 Evaluation Module
4
Setup Procedure
This section describes the hardware setup procedure and the installation of the software to program the
LMH2832 registers.
4.1
Connect EVM to a 5-V Bench Power Supply
1. Before making connections from the bench power supply to the evaluation board supply pin connector,
set the bench power supply to 5 V, and switch the bench power supply OFF.
2. While the supplies are turned OFF, connect the evaluation board power supply pins (V+ and GND) to
the bench power supply of 5 V and GND, as shown in
Figure 2
, using a low-noise bench power supply.
3. Turn ON the bench supplies after the power supply connections have been made. The LMH2832
evaluation board should read an approximate DC current of 204 mA for 5-V single supply with both the
LMH2832 channels enabled. Input and output pins should be biased to the mid-supplies as specified in
the LMH2832 data sheet (
SBOS709
) for proper operation.
4.2
Connect EVM to the External Signal Source at the Input
1. The LMH2832EVM-50 evaluation board provides the customer flexibility in testing at different input
frequencies using on-board input and output baluns as shown in
Figure 2
.
2. It is recommended to use 6-dB attenuator pads at the input while connecting a 50-
Ω
signal source to
the LMH2832EVM-50 evaluation board SMA inputs.
3. TI recommends using a low pass or band pass filter in-between the signal source and the evaluation
board while measuring the harmonic distortion or inter-modulation distortion products.
4.3
Connect EVM to the External Test Equipment at the Output
1. The LMH2832EVM-50 evaluation board has SMA connectors at the output and can be directly
connected to 50-
Ω
test equipment as shown in
Figure 2
.
2. While connecting the evaluation board output to an oscilloscope, make sure the oscilloscope is set in a
50-
Ω
termination for the correct voltage reading on the oscilloscope.
4.4
PD (Power Down) Input
1. The LMH2832EVM has jumpers (J6 and J8) that allow the individual channels of the amplifier to be
manually disabled. The LMH2832 EVM consumes less than 9 mA of supply current with both the
LMH2832 channels disabled.
2. The PDA and PDB SMA input connector facilitates driving the LMH2832 PDA and PDB pins with a
high-speed signal source. Note that the PD SMA input connector should to be terminated on-board
with 50
Ω
to GND (R11 and R12) so as to provide high-frequency termination for signals from a 50-
Ω
pulse generator.
