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ADS7891 Datasheet(PDF) 10 Page - Burr-Brown (TI) |
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ADS7891 Datasheet(HTML) 10 Page - Burr-Brown (TI) |
10 / 26 page ADS7891 SLAS410 − DECEMBER 2003 www.ti.com 10 D13−6 & D5−0 D5−0 Conversion No N Data For Conv. N Data For Conv. N−1 CS CONVST BUSY D13−D0 td1 + t(acq) BYTE t2 td10 td7 td8 td2 Figure 6. Read Control Via CS and RD Tied to BDGND DEVICE OPERATION AND DATA READ IN BACK-TO-BACK CONVERSION The following two figures illustrate device operation in back-to-back conversion mode. It is possible to operate the device at any throughput in this mode, but this is the only mode in which the device can be operated at throughputs exceeding 2.8 MSPS. A conversion starts on the CONVST falling edge. The BUSY output goes high after a delay (td2). Note that care must be taken not to abort the conversion (see Figure 4) apart from timing restrictions shown in Figure 7 and Figure 8. The conversion ends within the conversion time, t(conv), after the CONVST falling edge. The new acquisition can be immediately started without waiting for the BUSY signal to go low. This can be ensured with a CONVST high pulse width that is more than or equal to (t0 – t(conv) + 10 nsec) which is tw4 for a 3-MHz operation. Sample N Conversion N Data For Conversion N−1 (Data read Without Latency) CONVST BUSY D13−D0 t(conv) + td11 tw4 tw5 t(acq) td12 t0 = 333 ns for 3 MSPS Operation Figure 7. Back-To-Back Operation With CS and RD Low |
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