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ADS8326 데이터시트(PDF) 21 Page - Texas Instruments |
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ADS8326 데이터시트(HTML) 21 Page - Texas Instruments |
21 / 39 page 10W 50W OPA365 48pF 1000pF 1nF 10W 50W OPA365 48pF 1000pF +IN -IN ADS8326 10W 50W OPA365 48pF 1000pF 50W 48pF +IN -IN ADS8326 Single-Ended Differential ADS8326 www.ti.com.................................................................................................................................................. SBAS343C – MAY 2007 – REVISED SEPTEMBER 2009 The input current required by the analog inputs depends on a number of factors: sample rate, input voltage, source impedance, and power-down mode. Essentially, the current into the ADS8326 charges the internal capacitor array during the sample period. After this capacitance has been fully charged, there is no further input current. The source of the analog input voltage must be able to charge the input capacitance (48pF) to a 16-bit settling level within 4.5 clock cycles (0.750 μs). When the converter goes into Hold mode, or while it is in Power-Down mode, the input impedance is greater than 1G Ω. Care must be taken regarding the absolute analog input voltage. To maintain the linearity of the converter, the –IN input should not drop below GND – 0.3V or exceed GND + 0.5V. The +IN input should always remain within the range of GND – 0.3V to VDD + 0.3V, or –IN to –IN + VREF , whichever limit is reached first. Outside of these ranges, the converter linearity may not meet specifications. To minimize noise, low bandwidth input signals with low-pass filters should be used. In each case, care should be taken to ensure that the output impedance of the sources driving the +IN and –IN inputs are matched. Figure 41. Single-Ended and Differential Methods Often, a small capacitor (20pF) between the positive of Interfacing the ADS8326 and negative inputs helps to match their impedance. To obtain maximum performance from the ADS8326, the input circuit from Figure 41 is recommended. Copyright © 2007–2009, Texas Instruments Incorporated Submit Documentation Feedback 21 Product Folder Link(s): ADS8326 |
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