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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AMC7832IPAPR датащи(PDF) 37 Page - Texas Instruments |
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AMC7832IPAPR датащи(HTML) 37 Page - Texas Instruments |
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37 / 74 page  ADC 12-b Internal Reference (2.5V) DAC-0 12-b DAC-1 12-b DAC-11 12-b REF_CMP C > 4.7 µF (Minimize inductance to pin) REF_OUT1 REF_OUT2 LOCAL TEMP SENSOR DAC RANGE SETUP VRANGEA VRANGEB VRANGEC VRANGED * Each VRANGEn pin should be connected to either GND or one of the REF_OUT pins according to the desired output range for DAC group n. AGND2 AMC7832 www.ti.com SLAS836 – MARCH 2014 8.3.4 Internal Reference The AMC7832 includes a high performance internal reference for the on-chip ADC and twelve DACs. The internal reference is a 2.5-V bipolar transistor-based, precision bandgap reference. A compensation capacitor (4.7- μF, typical) should be connected between the REF_CMP terminal and AGND2. The AMC7832 includes two buffers to access the internal reference voltage through terminals REF_OUT1 and REF_OUT2. If unused, the two reference buffers can be powered down independently in the Power-down 1 register (address 0xB3). A third buffer is used to drive the ADC and should not be used to drive any external circuitry. The ADC reference buffer is powered down by default and should be enabled in the ADC Configuration Register (address 0x10) during device initialization. The REF_OUT1 and REF_OUT2 outputs can directly drive the VRANGEA,B,C,D inputs thus enabling adjustment of the DAC output ranges without the need for external circuitry. The internal reference buffers are not intended to drive external loads. If driving an external load, a high impedance buffer amplifier is required. Figure 51. AMC7832 Internal Reference Copyright © 2014, Texas Instruments Incorporated Submit Documentation Feedback 37 Product Folder Links: AMC7832 |
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