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AD7922 Datenblatt(PDF) 8 Page - Analog Devices |
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AD7922 Datenblatt(HTML) 8 Page - Analog Devices |
8 / 32 page AD7912/AD7922 Rev. 0 | Page 8 of 32 TIMING EXAMPLES Figure 6 and Figure 7 show some of the timing parameters from the Timing Specifications section. Timing Example 1 As shown in Figure 7, when fSCLK = 18 MHz and the throughput is 1 MSPS, the cycle time is t2 + 12.5(1/fSCLK) + tACQ = 1 µs With t2 = 10 ns minimum, then tACQ is 295 ns, which satisfies the requirement of 290 ns for tACQ. In Figure 7, tACQ is comprised of 2.5(1/fSCLK) + t10 + tQUIET, where t10 = 30 ns maximum. This allows a value of 126 ns for tQUIET, satisfying the minimum requirement of 30 ns. Timing Example 2 The AD7922 can also operate with slower clock frequencies. As shown in Figure 7, when fSCLK = 5 MHz and the throughput rate is 315 kSPS, the cycle time is t2 + 12.5(1/fSCLK) + tACQ = 3.17 µs With t2 = 10 ns minimum, then tACQ is 664 ns, which satisfies the requirement of 290 ns for tACQ. In Figure 7, tACQ is comprised of 2.5(1/fSCLK) + t10 + tQUIET, where t10 = 30 ns maximum. This allows a value of 134 ns for tQUIET, satisfying the minimum requirement of 30 ns. In this example, as with other slower clock values, the signal might already be acquired before the conversion is complete, but it is still necessary to leave 30 ns minimum tQUIET between conversions. In this example, the signal should be fully acquired at approximately point C in Figure 7. ZERO X 12 34 5 13 14 15 16 X CHN STY X X X X X CHN MOD DB11 DB10 DB2 DB1 DB0 Z t2 t6 t4 t8 t9 t3 t7 t5 t10 t1 tQUIET tCONVERT SCLK CS DOUT THREE-STATE THREE-STATE DIN B Figure 6. AD7922 Serial Interface Timing Diagram 12 3 45 13 14 15 16 tQUIET tACQUISITION 1/THROUGHPUT 12.5(1/fSCLK) tCONVERT BC SCLK CS t10 t2 Figure 7. Serial Interface Timing Example |
Ähnliche Teilenummer - AD7922 |
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Ähnliche Beschreibung - AD7922 |
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