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參數(shù)資料
| 型號(hào)： | TMP20F2810PBKAEP |
| 廠商： | Texas Instruments, Inc. |
| 元件分類： | 數(shù)字信號(hào)處理 |
| 英文描述： | Digital Signal Processors |
| 中文描述： | 數(shù)字信號(hào)處理器 |
| 文件頁(yè)數(shù)： | 62/159頁(yè) |
| 文件大?。?/td> | 2084K |
| 代理商： | TMP20F2810PBKAEP |
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Peripherals
62
March 2004 Revised October 2004
SGUS051A
4.2.9
External ADC Start-of-Conversion
EVA/EVB start-of-conversion (SOC) can be sent to an external pin (EVASOC/EVBSOC) for external ADC
interface. EVASOC and EVBSOC are MUXed with T2CTRIP and T4CTRIP, respectively.
4.3
Enhanced Analog-to-Digital Converter (ADC) Module
A simplified functional block diagram of the ADC module is shown in Figure 44. 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: 80 ns at 25-MHz ADC clock, 12.5 MSPS
16-channel, MUXed inputs
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:
Digital Value
4095
Input Analog Voltage
ADCLO
3
Multiple triggers as sources for the start-of-conversion (SOC) sequence
S/W software immediate start
EVA Event manager A (multiple event sources within EVA)
EVB Event manager B (multiple event sources within EVB)
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
EVA and EVB 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 F281x and C281x has been enhanced to provide flexible interface to event managers
A and B. The ADC interface is built around a fast, 12-bit ADC module with a fast conversion rate of 80 ns at
25-MHz ADC clock. The ADC module has 16 channels, configurable as two independent 8-channel modules
to service event managers A and B. 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 44 shows the block diagram of the F281x and C281x ADC module.
The two 8-channel modules have the capability to autosequence a series of conversions, each module has
the choice of selecting any one of the respective eight channels available through an analog MUX. In the
cascaded mode, the autosequencer functions as a single 16-channel sequencer. On each sequencer, once
the conversion is complete, the selected channel value is stored in its respective RESULT register.
Autosequencing allows the system to convert the same channel multiple times, allowing the user to perform
oversampling algorithms. This gives increased resolution over traditional single-sampled conversion results.
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