sprs439h_ADC_section - TMS320F28335 TMS320F28334...

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TMS320F28335, TMS320F28334, TMS320F28332 TMS320F28235, TMS320F28234, TMS320F28232 Digital Signal Controllers (DSCs) Data Manual PRODUCTION DATA information is current as of publication date. Products conform to specifications per the terms of the Texas Instruments standard warranty. Production processing does not necessarily include testing of all parameters. Literature Number: SPRS439H June 2007–Revised March 2010
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0, Value Digital = V 0 input when £ 4095, Value Digital = V 3 input when ³ V 3 input V 0 when < < 3 ADCLO Voltage Analog Input 4096 Value Digital - ´ = TMS320F28335, TMS320F28334, TMS320F28332 TMS320F28235, TMS320F28234, TMS320F28232 www.ti.com SPRS439H–JUNE 2007–REVISED MARCH 2010 4.7 Analog-to-Digital Converter (ADC) Module A simplified functional block diagram of the ADC module is shown in Figure 4-8 . The ADC module consists of a 12-bit ADC with a built-in sample-and-hold (S/H) circuit. Functions of the ADC module include: 12-bit ADC core with built-in S/H Analog input: 0.0 V to 3.0 V (Voltages above 3.0 V produce full-scale conversion results.) Fast conversion rate: Up to 80 ns at 25-MHz ADC clock, 12.5 MSPS 16 dedicated ADC channels. 8 channels multiplexed per Sample/Hold Autosequencing capability provides up to 16 "autoconversions" in a single session. Each conversion can be programmed to select any 1 of 16 input channels Sequencer can be operated as two independent 8-state sequencers or as one large 16-state sequencer (i.e., two cascaded 8-state sequencers) Sixteen result registers (individually addressable) to store conversion values The digital value of the input analog voltage is derived by: Multiple triggers as sources for the start-of-conversion (SOC) sequence S/W - software immediate start ePWM start of conversion XINT2 ADC start of conversion Flexible interrupt control allows interrupt request on every end-of-sequence (EOS) or every other EOS. Sequencer can operate in "start/stop" mode, allowing multiple "time-sequenced triggers" to synchronize conversions. SOCA and SOCB triggers can operate independently in dual-sequencer mode. Sample-and-hold (S/H) acquisition time window has separate prescale control. The ADC module in the 2833x/2823x devices has been enhanced to provide flexible interface to ePWM peripherals. The ADC interface is built around a fast, 12-bit ADC module with a fast conversion rate of up to 80 ns at 25-MHz ADC clock. The ADC module has 16 channels, configurable as two independent 8-channel modules. The two independent 8-channel modules can be cascaded to form a 16-channel module. Although there are multiple input channels and two sequencers, there is only one converter in the ADC module. Figure 4-8 shows the block diagram of the ADC module. The two 8-channel modules have the capability to autosequence a series of conversions, each module
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sprs439h_ADC_section - TMS320F28335 TMS320F28334...

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