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ADS7819PB Datasheet(PDF) 7 Page - Texas Instruments |
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ADS7819PB Datasheet(HTML) 7 Page - Texas Instruments |
7 / 13 page 2 ® ADS7819 7 BASIC OPERATION Figure 1 shows a basic circuit to operate the ADS7819. Taking R/C (pin 23) LOW for 40ns will initiate a conver- sion. BUSY (pin 25) will go LOW and stay LOW until the conversion is completed and the output registers are up- dated. Data will be output in Binary Two’s Complement with the MSB on D11 (pin 6). BUSY going HIGH can be used to latch the data. All convert commands will be ignored while BUSY is LOW. FIGURE 1. Basic Operation CS R/C BUSY OPERATION 1 X X None. Databus in Hi-Z state. ↓ 0 1 Initiates conversion. Databus remains in Hi-Z state. 0 ↓ 1 Initiates conversion. Databus enters Hi-Z state. 01 ↑ Conversion completed. Valid data from the most recent conversion on the databus. ↓ 1 1 Enables databus with valid data from the most recent conversion. ↓ 1 0 Conversion in progress. Databus in Hi-Z state, enabled when the conversion is completed. 0 ↑ 0 Conversion in progress. Databus in Hi-Z state, enabled when the conversion is completed. 00 ↑ Conversion completed. Valid data from the most recent conversion in the output register but the output pins D11-D0 are tri-stated. X X 0 New convert commands ignored. Conversion in progress. Table I. Control Line Functions for ‘read’ and ‘convert’. 1 2 3 4 5 6 7 8 9 10 11 12 13 14 28 27 26 25 24 23 22 21 20 19 18 17 16 15 ADS7819 50 Ω ±2.5V –5V +5V 0.1µF NC 10µF + 10µF + 0.1µF Convert Pulse BUSY 40ns min D0 (LSB) D1 D2 D3 D6 D5 D4 D7 D8 D9 D10 D11 (MSB) 0.1µF 10µF + The ADS7819 will begin tracking the input signal at the end of the conversion. Allowing 1.25 µs between convert com- mands assures accurate acquisition of a new signal. STARTING A CONVERSION The combination of CS (pin 24) and R/C (pin 23) LOW for a minimum of 40ns puts the sample/hold of the ADS7819 in the hold state and starts a conversion. BUSY (pin 25) will go LOW and stay LOW until the conversion is completed and the internal output register has been updated. All new convert commands during BUSY LOW will be ignored. The ADS7819 will begin tracking the input signal at the end of the conversion. Allowing 1.25 µs between convert com- mands assures accurate acquisition of a new signal. Refer to Table I for a summary of CS, R/C, and BUSY states and Figures 2 and 3 for timing parameters. DESCRIPTION ANALOG VALUE DIGITAL OUTPUT Full Scale Range ±2.5V Least Significant 1.22mV Bit (LSB) BINARY CODE HEX CODE +Full Scale 2.499V 0111 1111 1111 7FF (2.5V – 1LSB) Midscale 0V 0000 0000 0000 000 One LSB below –1.22mV 1111 1111 1111 FFF Midscale –Full Scale –2.5V 1000 0000 0000 800 BINARY TWO'S COMPLEMENT TABLE II. Ideal Input Voltages and Output Codes. |
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