SM320F2808-EP Datasheet, PDF (54/118 Pages) Texas Instruments – Digital Signal Processors

SM320F2808-EP, SM320F2806-EP
SM320F2801-EP
Digital Signal Processors
SGLS316A – MARCH 2006 – REVISED FEBRUARY 2007
www.ti.com
Figure 4-8 shows the ADC pin-biasing for internal reference and Figure 4-9 shows the ADC pin-biasing for
external reference.
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
Float or ground if internal reference is used
ADC External Current Bias Resistor
ADC Reference Positive Output
ADC Reference Medium Output
22 kW
ADCRESEXT
2.2 mF ^(A)
ADCREFP
2.2 mF ^(A)
ADCREFM
ADCREFP and ADCREFM should not
be loaded by external circuitry
ADC Power
ADC Analog and Reference I/O Power
V_DD1A18
V_DD2A18
V_SS1AGND
V_SS2AGND
V_DDA2
V_SSA2
V_DDAIO
V_SSAIO
ADC Analog Power Pin (1.8 V)
ADC Analog Power Pin (1.8 V)
ADC Analog Ground Pin
ADC Analog Ground Pin
ADC Analog Power Pin (3.3 V)
ADC Analog Ground Pin
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.
Figure 4-8. ADC Pin Connections With Internal Reference
54
Peripherals
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