Hello Phil, Welcome to the TI E2E Community. The correct place to connect to the internal reference is the REFIO pin. The internal reference has a 1kohm resistor in series with its output and the REFIO pin, so you will need to use an external buffer if you connect to this pin. If you use the REFby2 output (2.048V when using the internal reference), then you can source up to 2mA. The internal buffer is only intended to drive the ADC inputs, and is not specified for external loads. Regards, Keith N. Precision ADC Applications
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