TMS320F2809, TMS320F2808, TMS320F2806

TMS320F2802, TMS320F2801, TMS320C2802

TMS320C2801, TMS320F28016, TMS320F28015

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SPRS230L –OCTOBER 2003 –REVISED DECEMBER 2009

Figure 4-8shows the ADC pin-biasing for internal reference and Figure 4-9shows the ADC pin-biasing for external reference.

ADC 16-Channel Analog Inputs

ADC External Current Bias Resistor

ADC Reference Positive Output

ADC Reference Medium Output

ADC Power

ADC Analog and Reference I/O Power

ADCINA[7:0]

Analog input 0−3 V with respect to ADCLO

ADCINB[7:0]

Connect to analog ground

ADCLO

ADCREFIN

Float or ground if internal reference is used

 

22 kW

 

ADCRESEXT

 

 

ADCREFP

2.2 mF (A)

 

2.2 mF (A)

ADCREFP and ADCREFM should not

ADCREFM

 

be loaded by external circuitry

VDD1A18

 

ADC Analog Power Pin (1.8 V)

VDD2A18

 

ADC Analog Power Pin (1.8 V)

VSS1AGND

 

ADC Analog Ground Pin

VSS2AGND

 

ADC Analog Ground Pin

VDDA2

 

ADC Analog Power Pin (3.3 V)

VSSA2

 

ADC Analog Ground Pin

VDDAIO

 

ADC Analog Power Pin (3.3 V)

VSSAIO

 

ADC Analog I/O Ground Pin

A.TAIYO YUDEN LMK212BJ225MG-T or equivalent

B.External decoupling capacitors are recommended on all power pins.

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

Figure 4-8. ADC Pin Connections With Internal Reference

Copyright © 2003–2009, Texas Instruments Incorporated

Peripherals

65

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Texas Instruments TMS320C2802, TMS320F2809, TMS320F2808 ADCINA70, ADCINB70, Adclo, Adcrefin, Adcresext Adcrefp, Adcrefm