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The REF5045 was used with the circuit shown on Figure 105 for the case when using internal buffer and a 22uF X7R grade bypass capacitor at the REFBUFOUT pin. The REF5045 without buffer was used to generate the external reference without buffer. I will have to check with the team as to which buffer circuit was used for the case of external reference buffer driving the SAR ADC. I will confirm and get back to you with this information.
Confirmed with the team that the circuit on Figure 105 was used for the case of using internal buffer with a 22uF bypass capacitor at the REF input. For the case of external buffer, the OPA211 was used.
Please let me know if you have additional questions.
