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AD7870AQ 数据表(PDF) 10 Page - Analog Devices

部件名 AD7870AQ
功能描述  LC2MOS Complete, 12-Bit, 100 kHz, Sampling ADCs
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制造商  AD [Analog Devices]
网页  http://www.analog.com
标志 AD - Analog Devices

AD7870AQ 数据表(HTML) 10 Page - Analog Devices

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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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