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поискавой системы для электроныых деталей |
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поискавой системы для электроныых деталей |
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AMC7836IPAPR датащи(PDF) 38 Page - Texas Instruments |
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AMC7836IPAPR датащи(HTML) 38 Page - Texas Instruments |
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38 / 91 page  Temperature (°C) -40 -25 -10 5 20 35 50 65 80 95 110 125 0 20 40 60 80 100 120 140 160 D001 ADC 12-b Internal Reference (2.5 V) REF_CMP C > 4.7 µF (Minimize inductance to pin) Local Temperatu re Sensor AGND2 DAC-0 12-b DAC-1 12-b DAC-15 12-b 38 AMC7836 SLAS986D – NOVEMBER 2014 – REVISED FEBRUARY 2018 www.ti.com Product Folder Links: AMC7836 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated 7.3.4 Internal Reference The AMC7836 device includes a high-performance internal reference for the on-chip ADC and 16 DACs (see Figure 58). 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 pin and the AGND2 pin. The AMC7836 device includes a buffer 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. Figure 58. AMC7836 Internal Reference The internal reference is typically established after power-up in less than 5 ms at TA = 25°C however the reference settling time is highly dependent on temperature. Figure 59 shows typical reference settling time as a function of temperature. Figure 59. Internal Reference Settling Time vs Temperature |
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