TMS320F2809, TMS320F2808, TMS320F2806
TMS320F2802, TMS320F2801, UCD9501
TMS320C2802, TMS320C2801, and TMS320F2801x DSPs
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SPRS230H–OCTOBER 2003–REVISED JUNE 2006
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
(D)
ADCREFIN
Connect to 1.500, 1.024, or 2.048-V precision source
22 kW
ADC External Current Bias Resistor ADCRESEXT
(A)
2.2 mF
ADC Reference Positive Output
ADC Reference Medium Output
ADCREFP
ADCREFM
(A)
2.2 mF
ADCREFP and ADCREFM should not
be loaded by external circuitry
V
ADC Analog Power Pin (1.8 V)
ADC Analog Power Pin (1.8 V)
DD1A18
V
DD2A18
ADC Analog Power
ADC Analog Ground Pin
ADC Analog Ground Pin
V
V
SS1AGND
SS2AGND
ADC Analog Power Pin (3.3 V)
ADC Analog Ground Pin
V
V
DDA2
SSA2
ADC Analog Power Pin (3.3 V)
ADC Analog I/O Ground Pin
V
V
DDAIO
ADC Analog and Reference I/O Power
SSAIO
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 4-9. ADC Pin Connections With External Reference
NOTE
The temperature rating of any recommended component must match the rating of the end
product.
The ADC operation is configured, controlled, and monitored by the registers listed in Table 4-5.
Peripherals
63
TI [ TEXAS INSTRUMENTS ]
