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ENICSF2811PBKA Datasheet(PDF) 66 Page - Texas Instruments |
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ENICSF2811PBKA Datasheet(HTML) 66 Page - Texas Instruments |
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66 / 172 page  ADCINA[7:0] ADCINB[7:0] ADCLO ADCBGREFIN ADC External Current Bias Resistor ADCRESEXT ADCREFP V DDA1 V DDA2 V SSA1 V SSA2 AVDDREFBG AVSSREFBG V DDAIO V SSAIO V DD1 V SS1 Test Pin ADC Reference Positive Input ADCREFM ADC Reference Medium Input ADC Analog Power ADC Reference Power ADC Analog I/O Power ADC Digital Power Analog Input 0-3 V With Respect to ADCLO Connect to Analog Ground Analog 3.3 V Analog 3.3 V Analog 3.3 V Analog 3.3 V Analog Ground 1.8 V can use the same 1.8-V (or 1.9-V) supply as the digital core but separate the two with a ferrite bead or a filter Digital Ground ADC 16-Channel Analog Inputs 2 V 1 V (D) 1 F - μ 10 F μ 1 F - μ 10 F μ 24.9 k /20 k (C) TMS320F2810, TMS320F2811, TMS320F2812 TMS320C2810, TMS320C2811, TMS320C2812 SPRS174T – APRIL 2001 – REVISED MAY 2012 www.ti.com A. External decoupling capacitors are recommended on all power pins. B. Analog inputs must be driven from an operational amplifier that does not degrade the ADC performance. C. Use 24.9 k Ω for ADC clock range 1–18.75 MHz; use 20 kΩ for ADC clock range 18.75–25 MHz. D. It is recommended that buffered external references be provided with a voltage difference of (ADCREFP – ADCREFM) = 1 V ± 0.1% or better. External reference is enabled using bit 8 in the ADCTRL3 Register at ADC power up. In this mode, the accuracy of external reference is critical for overall gain. The voltage ADCREFP – ADCREFM will determine the overall accuracy. Do not enable internal references when external references are connected to ADCREFP and ADCREFM. See the TMS320x281x DSP Analog-to-Digital Converter (ADC) Reference Guide (literature number SPRU060) for more information. Figure 4-6. ADC Pin Connections With External Reference 66 Peripherals Copyright © 2001–2012, Texas Instruments Incorporated Submit Documentation Feedback Product Folder Link(s): TMS320F2810 TMS320F2811 TMS320F2812 TMS320C2810 TMS320C2811 TMS320C2812 |
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