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AD7876CN Datasheet(PDF) 10 Page - Analog Devices |
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AD7876CN Datasheet(HTML) 10 Page - Analog Devices |
10 / 20 page REV. B AD7870/AD7875/AD7876 –10– Figure 10. Mode 1 Timing Diagram, Byte or Serial Read its BUSY function. BUSY goes low at the start of conversion, stays low during the conversion and returns high when the con- version is complete. It is normally used in parallel interfaces to drive the microprocessor into a WAIT state for the duration of conversion. Figure 11 shows the Mode 2 timing diagram for the 12-bit par- allel data output format (12/ 8/CLK = +5 V). In this case, the ADC behaves like slow memory. The major advantage of this interface is that it allows the microprocessor to start conversion, WAIT and then read data with a single READ instruction. The user does not have to worry about servicing interrupts or ensur- ing that software delays are long enough to avoid reading during conversion. Figure 11. Mode 2 Timing Diagram, 12-Bit Parallel Read The Mode 1 timing diagram for byte and serial data is shown in Figure 10. INT goes low at the end of conversion and is reset high by the first falling edge of CS and RD. This first read at the end of conversion can either access the low byte or high byte of data depending on the status of HBEN (Figure 10 shows low byte only for example). The diagram shows both a noncontinu- ously and a continuously running clock (dashed line). MODE 2 INTERFACE The second interface mode is achieved by hard wiring CONVST low and conversion is initiated by taking CS low while HBEN is low. The track/hold amplifier goes into the hold mode on the falling edge of CS. In this mode, the BUSY/INT pin assumes |
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