SM320F28335PTPMEP Datasheet, PDF (72/167 Pages) Texas Instruments – Digital Signal Controller (DSC)

SM320F28335-EP
SPRS581D – JUNE 2009 – REVISED MAY 2012
www.ti.com
Figure 4-9 shows the ADC pin-biasing for internal reference and Figure 4-10 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
Connect to analog ground if internal reference is used
ADC External Current Bias Resistor
ADC Reference Positive Output
ADC Reference Medium Output
22 k
ADCRESEXT
2.2 F ^(A)
ADCREFP
2.2 F ^(A)
ADCREFM
ADC Power
V_DD1A18
V_DD2A18
V_SS1AGND
V_SS2AGND
ADC Analog and Reference I/O Power
V_DDA2
V_SSA2
V_DDAIO
V_SSAIO
ADCREFP and ADCREFM should not
be loaded by external circuitry
ADC Analog Power Pin (1.9 V)
ADC Analog Power Pin (1.9 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 4-9. ADC Pin Connections With Internal Reference
ADC 16-Channel Analog Inputs
ADCINA[7:0]
ADCINB[7:0]
ADCLO
ADCREFIN
ADC External Current Bias Resistor ADCRESEXT
ADC Reference Positive Output ADCREFP
ADC Reference Medium Output ADCREFM
ADC Analog Power
V_DD1A18
V_DD2A18
V_SS1AGND
V_SS2AGND
V_DDA2
V_SSA2
ADC Analog and Reference I/O Power
V_DDAIO
V_SSAIO
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)
22 kΩ
2.2 µF^(A)
2.2 µF^(A)
ADCREFP and ADCREFM should not
be loaded by external circuitry
ADC Analog Power Pin (1.9 V)
ADC Analog Power Pin (1.9 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.
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
72
Peripherals
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