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ADS7809UG4 Datasheet(PDF) 7 Page - Texas Instruments |
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ADS7809UG4 Datasheet(HTML) 7 Page - Texas Instruments |
7 / 20 page ADS7809 7 SBAS017C www.ti.com ANALOG INPUT SPECIFIC FUNCTION CS R/C BUSY EXT/INT DATACLK PWRD SB/BTC OPERATION Initiate Conversion and 1 > 0 0 1 0 Output 0 x Initiates conversion “n”. Data from conversion “n – 1” Output Data Using clocked out on DATA synchronized to 16 clock Internal Clock pulses output on DATACLK. 0 1 > 0 1 0 Output 0 x Initiates conversion “n”. Data from conversion “n – 1” clocked out on DATA synchronized to 16 clock pulses output on DATACLK. 1 > 0 0 1 1 Input 0 x Initiates conversion “n”. 0 1 > 0 1 1 Input 0 x Initiates conversion “n”. 1 > 0 1 1 1 Input x x Outputs a pulse on SYNC followed by data from conversion “n” clocked out synchronized to external DATACLK. 1 > 0 1 0 1 Input 0 x Outputs a pulse on SYNC followed by data from conversion “n – 1” clocked out synchronized to external DATACLK.(1) Conversion “n” in process. 0 0 > 1 0 1 Input 0 x Outputs a pulse on SYNC followed by data from conversion “n – 1” clocked out synchronized to external DATACLK .(1) Conversion “n” in process. Incorrect Conversions 0 0 0 > 1 x x 0 x CS or R/C must be HIGH or a new conversion will be initiated without time for acquisition. Power-Down x x x x x 0 x Analog circuitry powered. Conversion can proceed. x x x x x 1 x Analog circuitry disabled. Data from previous conversion maintained in output registers. Selecting Output Format x x x x x x 0 Serial data is output in Binary Two’s Complement format. x x x x x x 1 Serial data is output in Straight Binary format. NOTE: (1) See Figure 3b for constraints on previous data valid during conversion. Initiate Conversion and Output Data Using External Clock TABLE III. Control Truth Table. BINARY TWO’S COMPLEMENT STRAIGHT BINARY (SB/BTC LOW) (SB/BTC HIGH) DIGITAL OUTPUT TABLE IV. Output Codes and Ideal Input Voltages. HEX HEX DESCRIPTION BINARY CODE CODE BINARY CODE CODE Full-Scale Range ±10 ±5 ±3.33V 0V to 10V 0V to 5V 0V to 4V Least Significant Bit (LSB) 305 µV 153 µV 102 µV 153 µV76µV61µV +Full Scale (FS – 1LSB) 9.999695V 4.999847V 3.333231V 9.999847V 4.999924V 3.999939V 0111 1111 1111 1111 7FFF 1111 1111 1111 1111 FFFF Midscale 0V 0V 0V 5V 2.5V 2V 0000 0000 0000 0000 0000 1000 0000 0000 0000 8000 One LSB Below Midscale –305 µV –153 µV –102 µV 4.999847V 2.499924V 1.999939V 1111 1111 1111 1111 FFFF 0111 1111 1111 1111 7FFF –Full Scale –10V –5V –3.333333V 0V 0V 0V 1000 0000 0000 0000 8000 0000 0000 0000 0000 0000 |
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