Datasheet

ADCINA[7:0]
ADCINB[7:0]
ADCLO
ADCREFIN
ADC External Current Bias Resistor
ADCRESEXT
ADCREFP
V
DD1A18
V
DD2A18
V
SS1AGND
V
SS2AGND
V
DDAIO
V
SSAIO
V
DDA2
V
SSA2
ADC Reference Positive Output
ADCREFM
ADC Reference Medium Output
Reference I/O Power
Analog input 0-3 V with respect to ADCLO
Connect to Analog Ground
ADCREFP and ADCREFM should not
be loaded by external circuitry
ADC 16-Channel Analog Inputs
Connect to 1.500, 1.024, or 2.048-V precision source
(D)
ADC Analog Power Pin (1.9 V/1.8 V)
ADC Analog Power Pin (1.9 V/1.8 V)
ADC Analog I/O Ground Pin
ADC Analog Power Pin (3.3 V)
ADC Analog Ground Pin
ADC Analog Ground Pin
ADC Analog Ground Pin
ADC Analog Power Pin (3.3 V)
22 k
2.2 Fμ
(A)
2.2 Fμ
(A)
TMS320F28335, TMS320F28334, TMS320F28332
TMS320F28235, TMS320F28234, TMS320F28232
SPRS439M –JUNE 2007–REVISED AUGUST 2012 www.ti.com
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.
80 Peripherals Copyright © 2007–2012, Texas Instruments Incorporated
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