AD7798BRU View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
AD7798BRU Datasheet PDF : 28 Pages
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Preliminary Technical Information
Single Conversion Mode
In single conversion mode, the AD7798/AD7799 is placed in
shutdown mode between conversions. When a single conver-
sion is initiated by setting MD2, MD1, MD0 to 0, 0, 1 in the
mode register, the AD7798/AD7799 powers up, performs a
single conversion, and then returns to shutdown mode. The on-
chip oscillator requires 1 ms to power up. A conversion will
require a time period of 2 × tADC. DOUT/RDY goes low to
indicate the completion of a conversion. When the data-word
has been read from the data register, DOUT/RDY goes high. If
CS is low, DOUT/RDY remains high until another conversion is
initiated and completed. The data register can be read several
times, if required, even when DOUT/RDY has gone high.
AD7798/AD7799
Continuous Conversion Mode
This is the default power-up mode. The AD7798/AD7799 will
continuously convert, the RDY pin in the status register going
low each time a conversion is complete. If CS is low, the DOUT/
RDY line will also go low when a conversion is complete. To
read a conversion, the user can write to the communications
register, indicating that the next operation is a read of the data
register. The digital conversion will be placed on the DOUT/
RDY pin as soon as SCLK pulses are applied to the ADC.
DOUT/RDY returns high when the conversion is read. The user
can read this register additional times, if required. However, the
user must ensure that the data register is not being accessed at
the completion of the next conversion or else the new
conversion word will be lost.
CS
DIN
DOUT/RDY
SCLK
CS
0x08
0x200A
0x58
DATA
Figure 17. Single Conversion
DIN
DOUT/RDY
SCLK
0x58
DATA
Figure 18. Continuous Conversion
0x58
DATA
Pr.E 10/04 | Page 21 of 28
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