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Preliminary Technical Data
AD7322
Reference used for each channel will be the value written to the Ref bit during the last write to the Control
Register.
The Sequence 1 and Sequence 2 bits are used to control the operation of the Sequencer. See Table 8
A zero must be written to this bit to ensure correct operation of the AD7322.
3,2
14,12,11,1
Seq1/Seq2
ZERO
Table 9. Analog Input Configuration Selection
Channel Address Bit
Mode1 =1, Mode0 = 1
1 Pseudo Differential I/p
Vin+
Vin0
Vin0
Mode1 = 1, Mode0 =0
1Fully Differential i/p
Vin+
Vin-
Vin0
Vin1
Vin0
Vin1
Mode1 = 0, Mode0 =1
Not Allowed
Mode1 =0, Mode0 =0
Two-Single Ended i/ps
Vin+
Vin0
Vin1
ADD0
0
1
Vin-
Vin1
Vin1
Vin-
AGND
AGND
Table 10. Power Mode Selection
PM1
PM0
Description
1
1
Full Shutdown Mode,
In this mode all internal circuitry on the
AD7322 is powered down. Information in the Control register is
retained when the AD7322 is in Full Shutdown Mode.
1
0
Auto Shutdown Mode,
The AD7322 will enter Full Shut down
at the end of each conversion when the control register is
updated. All internal circuitry is powered down in Full
Shutdown.
0
1
Auto Standby Mode,
In this mode all internal circuitry is
powered down excluding the internal Reference. The AD7322
will enter Auto Standby Mode at the end of the Conversion after
the control register is updated.
0
0
Normal Mode,
All internal Circuitry is powered up at all times.
Table 11. Sequencer Selection
Seq1 Seq2 Sequence type
0
0
The Channel Sequencer is not used. The Analog Channel selected by programming the ADD0 bit in the
Control Register selects the next channel for conversion.
1
0
This Configuration is used in conjunction with the Channel Address Bit in the Control Register. Provided that
the channel Address bit is 1, the ADC will convert firstly on channel 0 then channel 1 and will repeat this
sequence until the Seq bits are changed in the Control Register.
1
1
The Channel Sequencer is not used. The Analog Channel selected by programming the ADD0 bit in the
Control Register selects the next channel for conversion.
Rev. PrE | Page 13 of 18
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