TMP320C2811PBKA datasheet(61/147 Pages) TI

61 / 147 page

Peripherals

June 2004

SPRS257

ADCINA[7:0]

ADCINB[7:0]

ADCLO

ADCBGREFIN

ADC External Current Bias Resistor

ADCRESEXT

ADCREFP

VDDA1

VDDA2

VSSA1

VSSA2

AVDDREFBG

AVSSREFBG

VDDAIO

VSSAIO

VDD1

VSS1

Test Pin

ADC Reference Positive Input

ADCREFM

ADC Reference Medium Input

ADC Analog Power

ADC Reference Power

ADC Analog I/O Power

ADC Digital Power

Analog Input 0−3 V With Respect to ADCLO

Connect to Analog Ground

24.9 kW

Analog 3.3 V

Analog Ground

1.8 V Can use the same 1.8-V (or 1.9-V)

supply as the digital core but separate the

two with a ferrite bead or a filter

Digital Ground

ADC 16-Channel Analog Inputs

1 mF −10 mF

2 V

1 V

1 mF − 10 mF

NOTES: A. External decoupling capacitors are recommended on all power pins.

B. Analog inputs must be driven from an operational amplifier that does not degrade the ADC performance.

C. It is recommended that buffered external references be provided with a voltage difference of (ADCREFP−ADCREFM)

= 1 V $ 0.1% or better.

External reference is enabled using bit 8 in the ADCTRL3 Register at ADC power up. In this mode, the accuracy of

external reference is critical for overall gain. The voltage ADCREFP−ADCREFM will determine the overall accuracy.

Do not enable internal references when external references are connected to ADCREFP and ADCREFM. See the

TMS320F28x DSP Analog-to-Digital Converter (ADC) Reference Guide

(literature number SPRU060) for more

information.

(See

Note C)

Figure 4−6. ADC Pin Connections With External Reference

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