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AD7327 Datasheet(PDF) 27 Page - Analog Devices

Part No. AD7327
Description  500 kSPS, 8-Channel, Software-Selectable, True Bipolar Input, 12-Bit Plus Sign ADC
Download  36 Pages
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Maker  AD [Analog Devices]
Homepage  http://www.analog.com
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AD7327 Datasheet(HTML) 27 Page - Analog Devices

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AD7327
Rev. 0 | Page 27 of 36
If a change to one of the range registers is required during a
sequence, it is necessary to first stop the sequence by writing to
the control register and setting Seq1 to 0 and Seq2 to 0. Next,
the write to the range register should be completed to change
the required range. The previously selected sequence should
then be initiated again by writing to the control register and
setting Seq1 to 0 and Seq2 to 1. The ADC converts the first
channel in the sequence.
The AD7327 can be configured to convert a sequence of
consecutive channels (see Figure 45). This sequence begins by
converting on Channel 0 and ends with a final channel as
selected by Bit ADD2 to Bit ADD0 in the control register. In
this configuration, there is no need for a write to the sequence
register. To operate the AD7327 in this mode, set Seq1 to 1 and
Seq2 to 0, and then select the final channel in the sequence by
programming Bit ADD2 to Bit ADD0 in the control register.
Once the control register is configured to operate the AD7327
in this mode, the DIN line can be held low or the write bit can
be set to 0. To return to traditional multichannel operation, a
write to the control register to set Seq1 to 0 and Seq2 to 0 is
necessary.
When Seq1 and Seq2 are both set to 0, or when both are set
to 1, the AD7327 is configured to operate in traditional multi-
channel mode, where a write to the Channel Address Bit ADD2
to Bit ADD0 in the control register selects the next channel for
conversion.
DIN: WRITE TO RANGE REGISTER 1 TO SELECT THE RANGE
FOR ANALOG INPUT CHANNELS.
DOUT: CONVERSION RESULT FROM CHANNEL 0, ±10V
RANGE, SINGLE-ENDED MODE.
CS
DIN: WRITE BIT = 0 OR DIN LINE HELD LOW TO CONTINUE
THROUGH SEQUENCE OF CONSECUTIVE CHANNELS.
DOUT: CONVERSION RESULT FROM CHANNEL 1,
RANGE SELECTED IN RANGE REGISTER 1.
CS
DIN: WRITE TO RANGE REGISTER 2 TO SELECT THE RANGE
FOR ANALOG INPUT CHANNELS.
DOUT: CONVERSION RESULT FROM CHANNEL 0,
RANGE SELECTED IN RANGE REGISTER 1,
SINGLE-ENDED MODE.
CS
DIN: WRITE BIT = 0 OR DIN LINE HELD LOW TO CONTINUE
TO CONVERT THROUGH THE SEQUENCE OF
CONSECUTIVE CHANNELS.
DOUT: CONVERSION RESULT FROM CHANNEL 0,
RANGE SELECTED IN RANGE REGISTER 1.
CS
DIN: WRITE TO CONTROL REGISTER TO SELECT THE FINAL
CHANNEL IN THE CONSECUTIVE SEQUENCE, SET Seq1 = 1
AND Seq2 = 0. SELECT OUTPUT CODING FOR SEQUENCE.
DOUT: CONVERSION RESULT FROM CHANNEL 0,
RANGE SELECTED IN RANGE REGISTER 1,
SINGLE-ENDED MODE.
CS
POWER ON.
DINTIEDLOW/WRITE BIT = 0.
CONTINUOUSLY CONVERT
ON CONSECUTIVE SEQUENCE
OF CHANNELS.
DIN: WRITE TO CONTROL
REGISTER TO STOP THE
SEQUENCE, Seq1 = 0, Seq2 = 0.
DOUT: CONVERSION RESULT
FROM CHANNEL IN SEQUENCE.
CS
STOPPING
A SEQUENCE.
Figure 45. Flowchart for Consecutive Sequence of Channels


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