AM263P4: Precision op-amp for ADC reference input

Hello Koichiro,

Thank you for bringing this to our attention regarding the ADC reference buffer documentation in the TRM.

Appologies for the delayed response while I was OOO last week.

Let me clarify the ADC reference buffer implementation options:

1. Internal Reference Buffer (Recommended):
- Built-in to the device
- Provides sufficient performance for most applications
- Simple to implement with minimal external components (defined in the HW Design Guidelines)
- Factory calibrated for reliable operation

2. External Precision Voltage Source With/W/O Op-amp (Optional):
Would only be necessary if your application requires:
- Enhanced noise performance beyond internal buffer capabilities
- Stricter accuracy requirements than internal specifications
- Custom reference voltage levels
- Special drive requirements for multiple ADCs

For optimal performance with an external buffer, key specifications to consider include:
- Low output impedance
- Good temperature stability
- Low noise characteristics
- Sufficient bandwidth

I will work with our documentation team to:
1. Investigate the content removal in revision C
2. Ensure the correct details are included in future TRM releases

To help provide the best solution for your application:
- What are your ADC accuracy requirements?
- What is your expected sampling rate?
- Are you experiencing any specific issues with the internal reference buffer?

Best Regards,
Zackary Fleenor