Texas Instruments ADS1278V2EVM-PDK User Manual page 4

Hardware
2 Hardware
The ADS1278 EVM is designed for easy interfacing with analog input sources. This section covers the details of
the front-end circuit, including jumper configuration for different input test signals and board connectors for signal
sources.
2.1 EVM Analog Input options
The ADS1278 EVM board offers different analog input circuits, including
Inputs, and Undriven Input
2.1.1 Fully Differential SMA Inputs
For best performance, connect differential analog input signals through the SMA connectors on channels 1 and
2, as shown in Figure 2-1. Alternatively, headers are provided to directly connect inputs for dc measurements, or
where best ac performance is not needed. A possibility is to use the fully-differential SMA inputs as single-ended
inputs. Connect the single-ended input to either the AINP or AINN SMA connector, then use the supplied shunt
to connect the unused input to GND via the header. The input driver circuits use the
amplifier in a low pass, unity-gain configuration with an additional single-pole RC filter at the output. Multiple
passive components around the amplifier are intentionally left uninstalled to give users the flexibility to customize
the input drive circuit for specific application.
2.1.2 Single-Ended SMA Inputs
Connect single-ended input signals through the SMA connectors on channels 3 and 4 . These channels also
feature headers that can be used to short the inputs to ground using shunt connectors. The input driver circuits
are identical to the ones used in the fully differential SMA input circuits on channels 1 and 2 except the negative
inputs are grounded as shown in
4 ADS1278EVM-PDK Evaluation Module
Pins.
AINP1
AINP1
1
142-0701-801
J11
1
2
3
4
GND
TSW-104-07-G-S
AINN1
AINN1
1
142-0701-801
GND
Figure 2-1. SMA Input Connections
Figure 2-1.
Copyright © 2024 Texas Instruments Incorporated
Section
AINP3
AINP3
1
142-0701-801
J13
1
2
GND
GND
AINN3
R101
0
GND
www.ti.com
2.1.1, Single-Ended SMA
THS4551 fully-differential
SBAU436 – JANUARY 2024
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