參數(shù)資料
型號: SM320F2812HFGM
廠商: TEXAS INSTRUMENTS INC
元件分類: 數(shù)字信號處理
英文描述: 16-BIT, 150 MHz, OTHER DSP, CQFP172
封裝: NCTB, CERAMIC, QFP-172
文件頁數(shù): 39/147頁
文件大?。?/td> 1721K
代理商: SM320F2812HFGM
Electrical Specifications
132
December 2004
SGUS053
6.29.5
Detailed Description
6.29.5.1 Reference Voltage
The on-chip ADC has a built-in reference, which provides the reference voltages for the ADC. ADCVREFP
is set to 2.0 V and ADCVREFM is set to 1.0 V.
6.29.5.2 Analog Inputs
The on-chip ADC consists of 16 analog inputs, which are sampled either one at a time or two channels at a
time. These inputs are software-selectable.
6.29.5.3 Converter
The on-chip ADC uses a 12-bit four-stage pipeline architecture, which achieves a high sample rate with low
power consumption.
6.29.5.4 Conversion Modes
The conversion can be performed in two different conversion modes:
Sequential sampling mode (SMODE = 0)
Simultaneous sampling mode (SMODE = 1)
6.29.6
Sequential Sampling Mode (Single-Channel) (SMODE = 0)
In sequential sampling mode, the ADC can continuously convert input signals on any of the channels (Ax
to Bx). The ADC can start conversions on event triggers from the Event Managers (EVA/EVB), software
trigger, or from an external ADCSOC signal. If the SMODE bit is 0, the ADC will do conversions on the selected
channel on every Sample/Hold pulse. The conversion time and latency of the Result register update are
explained below. The ADC interrupt flags are set a few SYSCLKOUT cycles after the Result register update.
The selected channels will be sampled at every falling edge of the Sample/Hold pulse. The Sample/Hold pulse
width can be programmed to be 1 ADC clock wide (minimum) or 16 ADC clocks wide (maximum).
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