ADC Reference Positive Output ADCREFM ADC Reference Medium Output Reference IO

Adc reference positive output adcrefm adc reference

This preview shows page 80 - 83 out of 200 pages.

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 F μ (A) 2.2 F μ (A) TMS320F28335, TMS320F28334, TMS320F28332 TMS320F28235, TMS320F28234, TMS320F28232 SPRS439H–JUNE 2007–REVISED MARCH 2010 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 © 2007–2010, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TMS320F28335 TMS320F28334 TMS320F28332 TMS320F28235 TMS320F28234 TMS320F28232
Image of page 80
TMS320F28335, TMS320F28334, TMS320F28332 TMS320F28235, TMS320F28234, TMS320F28232 SPRS439H–JUNE 2007–REVISED MARCH 2010 4.7.1 ADC Connections if the ADC Is Not Used It is recommended to keep the connections for the analog power pins, even if the ADC is not used. Following is a summary of how the ADC pins should be connected, if the ADC is not used in an application: V DD1A18 /V DD2A18 – Connect to V DD V DDA2 , V DDAIO – Connect to V DDIO V SS1AGND /V SS2AGND , V SSA2 , V SSAIO – Connect to V SS ADCLO – Connect to V SS ADCREFIN – Connect to V SS ADCREFP/ADCREFM – Connect a 100-nF cap to V SS ADCRESEXT – Connect a 20-k resistor (very loose tolerance) to V SS . ADCINAn, ADCINBn – Connect to V SS When the ADC is not used, be sure that the clock to the ADC module is not turned on to realize power savings. When the ADC module is used in an application, unused ADC input pins should be connected to analog ground (V SS1AGND /V SS2AGND ) NOTE ADC parameters for gain error and offset error are specified only if the ADC calibration routine is executed from the Boot ROM. See Section 4.7.3 for more information. Copyright © 2007–2010, Texas Instruments Incorporated Peripherals 81 Submit Documentation Feedback Product Folder Link(s): TMS320F28335 TMS320F28334 TMS320F28332 TMS320F28235 TMS320F28234 TMS320F28232
Image of page 81
TMS320F28335, TMS320F28334, TMS320F28332 TMS320F28235, TMS320F28234, TMS320F28232 SPRS439H–JUNE 2007–REVISED MARCH 2010 4.7.2 ADC Registers The ADC operation is configured, controlled, and monitored by the registers listed in Table 4-6 .
Image of page 82
Image of page 83

You've reached the end of your free preview.

Want to read all 200 pages?

  • Summer '20
  • Serial Peripheral Interface Bus, Texas Instruments Incorporated, TMS320F28335

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

  • Left Quote Icon

    Student Picture

Stuck? We have tutors online 24/7 who can help you get unstuck.
A+ icon
Ask Expert Tutors You can ask You can ask You can ask (will expire )
Answers in as fast as 15 minutes