Ths4281 Reference Driver With Complementary Opa333 For Drift And Offset Correction - Texas Instruments ADS8339EVM-PDK User Manual

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2.3 Voltage Reference
Because the EVM is powered by a 5-V analog supply, make sure to use a value below 5 V for the
reference. This EVM uses a 4.5-V reference, created by the onboard REF5045, as shown in
REF5045 output is filtered by an RC filter with a 160-Hz cutoff frequency to minimize noise contribution.
The EVM is buffered by the THS4281, which drives the 10 μF capacitor required at the ADC reference
input. The OPA333
minimizes offset and drift.
REF5045
Figure 3. THS4281 Reference Driver with Complementary OPA333 for Drift and Offset Correction
SBAU233A – October 2014 – Revised November 2015
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with additional feedback is optional, but does complement the THS4281, and
1 F
5 V
±
OPA333
1 k
4.5 V
+
1 F
Copyright © 2014–2015, Texas Instruments Incorporated
20 k
5 V
-
THS4281
1 k
+
1 F
EVM Analog Interface
Figure 3. The
REF
0.22
10 F
5
ADS8339EVM-PDK