SM320F2808-EP Datasheet, PDF (55/118 Pages) Texas Instruments – Digital Signal Processors

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SM320F2808-EP, SM320F2806-EP
SM320F2801-EP
Digital Signal Processors
SGLS316A – MARCH 2006 – REVISED FEBRUARY 2007
ADC 16-Channel Analog Inputs
ADCINA[7:0]
ADCINB[7:0]
ADCLO
ADCREFIN
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)
ADC External Current Bias Resistor
ADC Reference Positive Output
ADC Reference Medium Output
ADCRESEXT
ADCREFP
ADCREFM
22 kW
2.2 mF ^(A)
2.2 mF ^(A)
ADCREFP and ADCREFM should not
be loaded by external circuitry
ADC Analog Power
V_DD1A18
V_DD2A18
V_SS1AGND
V_SS2AGND
ADC Analog Power Pin (1.8 V)
ADC Analog Power Pin (1.8 V)
ADC Analog Ground Pin
ADC Analog Ground Pin
V_DDA2
V_SSA2
ADC Analog Power Pin (3.3 V)
ADC Analog Ground Pin
ADC Analog and Reference I/O Power
V_DDAIO
V_SSAIO
ADC Analog Power Pin (3.3 V)
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.
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. Texas Instruments recommends Texas Instruments 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.
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Peripherals
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