TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
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SPRS439I–JUNE 2007–REVISED MARCH 2011
ADCINA[7:0]
ADCINB[7:0]
ADCLO
ADC 16-Channel Analog Inputs
Analog input 0-3 V with respect to ADCLO
Connect to Analog Ground
Connect to 1.500, 1.024, or 2.048-V precision source(D)
ADCREFIN
22 k
ADC External Current Bias Resistor ADCRESEXT
2.2 μF(A)
2.2 μF(A)
ADC Reference Positive Output
ADC Reference Medium Output
ADCREFP
ADCREFM
ADCREFP and ADCREFM should not
be loaded by external circuitry
VDD1A18
VDD2A18
VSS1AGND
VSS2AGND
ADC Analog Power Pin (1.9 V/1.8 V)
ADC Analog Power Pin (1.9 V/1.8 V)
ADC Analog Ground Pin
ADC Analog Ground Pin
VDDA2
VSSA2
ADC Analog Power Pin (3.3 V)
ADC Analog Ground Pin
VDDAIO
VSSAIO
ADC Analog Power Pin (3.3 V)
ADC Analog I/O Ground Pin
Reference I/O Power
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.
D. External voltage on ADCREFIN is enabled by changing bits 15:14 in the ADC Reference Select register depending on
the voltage used on this pin. TI recommends TI part REF3020 or equivalent for 2.048-V generation. Overall gain
accuracy will be determined by accuracy of this voltage source.
Figure 4-10. ADC Pin Connections With External Reference
NOTE
The temperature rating of any recommended component must match the rating of the end
product.
Copyright © 2007–2011, Texas Instruments Incorporated
Peripherals
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