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AD7477AAKSZ-REEL Datasheet(PDF) 9 Page - Analog Devices |
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AD7477AAKSZ-REEL Datasheet(HTML) 9 Page - Analog Devices |
9 / 28 page AD7476A/AD7477A/AD7478A Rev. F | Page 9 of 28 Timing Diagrams TO OUTPUT PIN CL 50pF 200 µA IOH 200 µA IOL 1.6V Figure 2. Load Circuit for Digital Output Timing Specifications Timing Example 1 Having fSCLK = 20 MHz and a throughput of 1 MSPS, a cycle time of t2 + 12.5 (1/fSCLK) + tACQ = 1 µs where: t2 = 10 ns min, leaving tACQ to be 365 ns. This 365 ns satisfies the requirement of 250 ns for tACQ. From Figure 4, tACQ is comprised of 2.5 (1/fSCLK) + t8 + tQUIET where: t8 = 36 ns maximum. This allows a value of 204 ns for tQUIET, satisfying the minimum requirement of 50 ns. Timing Example 2 Having fSCLK = 5 MHz and a throughput is 315 kSPS yields a cycle time of t2 + 12.5 (1/fSCLK) + tACQ = 3.174 µs where: t2 = 10 ns min, this leaves tACQ to be 664 ns. This 664 ns satisfies the requirement of 250 ns for tACQ. From Figure 4, tACQ is comprised of 2.5 (1/fSCLK) + t8 + tQUIET, t8 = 36 ns maximum This allows a value of 128 ns for tQUIET, satisfying the minimum requirement of 50 ns. In this example and with other, slower clock values, the signal may already be acquired before the conversion is complete, but it is still necessary to leave 50 ns minimum tQUIET between conversions. In Example 2, acquire the signal fully at approximately Point C in Figure 4. CS SCLK SDATA t2 t6 t3 t4 t7 t5 t8 tCONVERT tQUIET ZERO ZERO ZERO DB11 DB10 DB2 DB1 DB0 B THREE-STATE THREE- STATE Z 4 LEADING ZEROS 1 3 13 14 15 16 t1 4 5 2 Figure 3. AD7476A Serial Interface Timing Diagram CS SCLK t2 tCONVERT B 1 2 5 13 14 15 16 C t8 tQUIET tACQ 12.5(1/fSCLK) 1/THROUGHPUT 3 4 Figure 4. Serial Interface Timing Example |
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