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ADS1292 Datasheet(PDF) 30 Page - Texas Instruments |
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ADS1292 Datasheet(HTML) 30 Page - Texas Instruments |
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30 / 69 page  STAR co TOp de STARTPin DN I 4/f CLK DRDY or t DR t SETTLE ADS1291 ADS1292 ADS1292R SBAS502A – DECEMBER 2011 – REVISED MARCH 2012 www.ti.com START The START pin must be set high or the START command sent to begin conversions. When START is low or if the START command has not been sent, the device does not issue a DRDY signal (conversions are halted). When using the START opcode to control conversion, hold the START pin low. The ADS1291, ADS1292, and ADS1292R feature two modes to control conversion: continuous mode and single-shot mode. The mode is selected by SINGLE_SHOT (bit 7 of the CONFIG1 register). In multiple device configurations the START pin is used to synchronize devices (see the Multiple Device Configuration subsection of the SPI Interface section for more details). Settling Time The settling time (tSETTLE) is the time it takes for the converter to output fully settled data when the START signal is pulled high. Once START is pulled high, DRDY is also pulled high. The next DRDY falling edge indicates that data are ready. Figure 37 shows the timing diagram and Table 11 shows the settling time for different data rates. The settling time depends on fCLK and the decimation ratio (controlled by the DR[2:0] bits in the CONFIG1 register). Refer to Table 10 for the settling time as a function of tMOD. Note that when START is held high and there is a step change in the input signal, it takes 3 tDR for the filter to settle to the new value. Settled data are available on the fourth DRDY pulse. Settling time number uncertainty is one tMOD cycle. Therefore, it is recommended to add one tMOD cycle delay before issuing SCLK to retrieve data. (1) Settling time uncertainty is one tMOD cycle. Figure 37. Settling Time Table 11. Settling Time for Different Data Rates DR[2:0] SETTLING TIME(1) UNIT(2) 000 4100 tMOD 001 2052 tMOD 010 1028 tMOD 011 516 tMOD 100 260 tMOD 101 132 tMOD 110 68 tMOD 111 — — (1) Settling time uncertainty is one tMOD cycle. (2) tMOD = 4 tCLK for CLK_DIV = 0 and tMOD = 16 tCLK for CLK_DIV = 1. 30 Submit Documentation Feedback Copyright © 2011–2012, Texas Instruments Incorporated Product Folder Link(s): ADS1291 ADS1292 ADS1292R |
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