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1.9 Internal/External Reference Voltage Selection

Bandgap

reference

ADC REFSEL

ADC reference

ADCREFIN

F280x DSP

ADCRESEXT

(A)

ADCREFP

(A)

ADCREFM

(A)

ADC LO

2.048-V reference

Analog ground

Internal/External Reference Voltage Selection

By default, an internally generated bandgap voltage reference is selected to supply the ADC logic.

Based on customer application requirements, the ADC logic may be supplied by an external voltage

reference. The ADC will accept 2.048 V, 1.5 V, or 1.024 V on the ADCREFIN pin. The value of the

ADCREFSEL register determines the reference source selected.

If the internal reference option is chosen, the ADCREFIN pin can be left connected to the selected source,

left floating, or grounded. Regardless of which option is chosen, the external circuit for the ADCRESEXT,

ADCREFP, and ADCREFM pins is the same.

The external reference voltage of 2.048 V was chosen to match industry standard reference components.

These components are available in various temperature ratings. A recommended Texas Instruments part

is REF3020AIDBZ.

Figure 1-11. External Bias for 2.048-V External Reference

A For component values, see the TMS320F28332, TMS320F28334, TMS320F28335 Digital Signal Controllers (DSCs)

Data Manual (literature number SPRS439).

Analog-to-Digital Converter (ADC)30 SPRU812A – September 2007 – Revised October 2007

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ADC 320F Spezifikationen Seite 30