EVAL-AD7796EB View Datasheet(PDF) - Analog Devices
Part Name
Description
MFG CO.
'EVAL-AD7796EB' PDF : 24 Pages View PDF
AD7796/AD7797
Single Conversion Mode
In single conversion mode, the AD7796/AD7797 are placed in
shutdown mode between conversions. When a single conver-
sion is initiated by setting MD2, MD1, and MD0 in the mode
register to 0, 0, and 1, respectively, the part powers up, performs
a single conversion, and then returns to shutdown mode. The
on-chip oscillator requires 1 ms to power-up. A conversion
requires 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.
Continuous Conversion Mode
This is the default power-up mode. The AD7796/AD7797
continuously convert, and the RDY pin in the status register
goes low each time a conversion is complete. If CS is low, the
DOUT/RDY line also goes low when a conversion is complete.
To read a conversion, the user can write to the communication
register, indicating that the next operation is a read of the data
register. The digital conversion is 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 the new conversion word is lost.
CS
DIN
DOUT/RDY
SCLK
CS
DIN
DOUT/RDY
SCLK
0x08
0x200A
0x58
Figure 14. Single Conversion
DATA
0x58
DATA
Figure 15. Continuous Conversion
0x58
DATA
Rev. A | Page 18 of 24
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