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AMC7836IPAPRG4 数据表(PDF) 77 Page - Texas Instruments |
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AMC7836IPAPRG4 数据表(HTML) 77 Page - Texas Instruments |
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77 / 91 page ![]() S (138 5 46 3 1025 1) T 430.93 µs 4.3 MHz u u u S (138 5 46 3 1025 1) T 500.811 µs 3.7 MHz u u u CLK CH CLK CH CLK CH S OSC (B # B U # U T # T ) T ¦ u u u 77 AMC7836 www.ti.com SLAS986D – NOVEMBER 2014 – REVISED FEBRUARY 2018 Product Folder Links: AMC7836 Submit Documentation Feedback Copyright © 2014–2018, Texas Instruments Incorporated Table 64. ADC Conversion Rate and Total Update Number of Clocks ADC CONVERSION RATE ADC INPUT CHANNEL ACQUISITION CLOCKS CONVERSION CLOCKS tS (ACQUISITION + CONVERSION) NUMBER OF CLOCKS 00 Bipolar 124.5 13.5 138 Unipolar 32.5 13.5 46 Internal Temperature Sensor — — 1025 01 Bipolar 124.5 13.5 138 Unipolar 78.5 13.5 92 Internal Temperature Sensor — — 1025 10 Bipolar 124.5 13.5 138 Unipolar 124.5 13.5 138 Internal Temperature Sensor — — 1025 11 Bipolar 262.5 13.5 276 Unipolar 262.5 13.5 276 Internal Temperature Sensor — — 1025 The minimum and maximum oscillator frequency specifications in conjunction with the number of clocks required for the unipolar, bipolar and temperature sensor inputs should be applied to Equation 5 to calculate the total update time range. where • TS is the total update time • BCLK is the total bipolar clocks • #BCH is the number of active bipolar inputs • UCLK is the total unipolar clocks • #UCH is the number of active unipolar inputs • TCKL is the total internal temperature-sensor clocks • #TCH is the number of active internal temperature sensor channels; either 1 or 0 • ƒOSC is the internal oscillator frequency (5) The following is an example of a complete calculation of the total update time range. In this example, the ADC conversion rate is set to 00 and the following ADC input channels are used: • Bipolar channels: ADC_1 through ADC_5 (5 active bipolar channels) • Unipolar channels: LV_ADC16 through LV_ADC18 (3 active unipolar channels) • Internal temperature sensor (1 active temperature channel) Table 64 gives the total number of clocks required for each ADC input under the example conditions. For the minimum specified oscillator frequency of 3.7 MHz, and with the ADC conversion rate set to 00, use Equation 6 to calculate the total maximum update time for this example. (6) For the maximum specified oscillator frequency of 4.3 MHz, use Equation 7 to calculate the total minimum update time for this example. (7) Therefore, the total update time range is 430.93 µs to 500.811 µs. |
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