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TMS320F28026DA Datasheet(PDF) 70 Page - Texas Instruments |
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TMS320F28026DA Datasheet(HTML) 70 Page - Texas Instruments |
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70 / 147 page  9.9.1.1 Analog-to-Digital Converter (ADC) 9.9.1.1.1 Features The core of the ADC contains a single 12-bit converter fed by two sample-and-hold circuits. The sample-and- hold circuits can be sampled simultaneously or sequentially. These, in turn, are fed by a total of up to 13 analog input channels. The converter can be configured to run with an internal band-gap reference to create true- voltage based conversions or with a pair of external voltage references (VREFHI/VREFLO) to create ratiometric- based conversions. Contrary to previous ADC types, this ADC is not sequencer-based. It is easy for the user to create a series of conversions from a single trigger. However, the basic principle of operation is centered around the configurations of individual conversions, called SOCs, or Start-Of-Conversions. Functions of the ADC module include: • 12-bit ADC core with built-in dual sample-and-hold (S/H) • Simultaneous sampling or sequential sampling modes • Full range analog input: 0 V to 3.3 V fixed, or VREFHI/VREFLO ratiometric. The digital value of the input analog voltage is derived by: – Internal Reference (VREFLO = VSSA. VREFHI must not exceed VDDA when using either internal or external reference modes.) 0, Value Digital = V 0 input when £ 3.3 V Voltage Analog Input 4096 Value Digital REFLO - ´ = V 3.3 input V 0 when < < 4095, Value Digital = V 3.3 input when ³ – External Reference (VREFHI/VREFLO connected to external references. VREFHI must not exceed VDDA when using either internal or external reference modes.) 0, Value Digital = V 0 input when £ V V V Voltage Analog Input 4096 Value Digital REFLO REFHI REFLO - - ´ = V input V 0 when REFHI < < 4095, Value Digital = V input when REFHI ³ • Up to 16-channel, multiplexed inputs • 16 SOCs, configurable for trigger, sample window, and channel • 16 result registers (individually addressable) to store conversion values • Multiple trigger sources – S/W – software immediate start – ePWM 1–4 – GPIO XINT2 – CPU Timers 0/1/2 – ADCINT1/2 • 9 flexible PIE interrupts, can configure interrupt request after any conversion TMS320F28027, TMS320F28027-Q1, TMS320F28027F, TMS320F28027F-Q1, TMS320F28026 TMS320F28026-Q1, TMS320F28026F, TMS320F28026F-Q1, TMS320F28023 TMS320F28023-Q1, TMS320F28022, TMS320F28021, TMS320F28020, TMS320F280200 SPRS523P – NOVEMBER 2008 – REVISED FEBRUARY 2021 www.ti.com 70 Submit Document Feedback Copyright © 2021 Texas Instruments Incorporated Product Folder Links: TMS320F28027 TMS320F28027-Q1 TMS320F28027F TMS320F28027F-Q1 TMS320F28026 TMS320F28026-Q1 TMS320F28026F TMS320F28026F-Q1 TMS320F28023 TMS320F28023- Q1 TMS320F28022 TMS320F28021 TMS320F28020 TMS320F280200 |
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