AD7328BRUZ Analog Devices Inc, AD7328BRUZ Datasheet - Page 25

• Manufacturer Part Number: AD7328BRUZ
• Description: IC ADC 12BIT+ SAR 8CHAN 20TSSOP
• Manufacturer: Analog Devices Inc

Specifications of AD7328BRUZ

• Data Interface: DSP, MICROWIRE™, QSPI™, Serial, SPI™
• Design Resources: Using AD7328 in Appls with Single-Ended Industrial-Level Signals (CN0047)
• Number Of Bits: 12
• Sampling Rate (per Second): 1M
• Number Of Converters: 1
• Power Dissipation (max): 30mW
• Voltage Supply Source: Dual ±
• Operating Temperature: -40°C ~ 85°C
• Mounting Type: Surface Mount
• Package / Case: 20-TSSOP (0.173", 4.40mm Width)
• Resolution (bits): 13bit
• Sampling Rate: 1MSPS
• Input Channel Type: Pseudo Differential, Single Ended
• Supply Current: 900µA
• Digital Ic Case Style: TSSOP
• No. Of Pins: 20
• Lead Free Status / RoHS Status: Lead free / RoHS Compliant
• For Use With: EVAL-AD7328CBZ - BOARD EVALUATION FOR AD7328
• Lead Free Status / Rohs Status: RoHS Compliant part Electrostatic Device

SEQUENCER OPERATION
The AD7328 can be configured to automatically cycle through a
number of selected channels using the on-chip sequence register
with the Seq1 bit and the Seq2 bit in the control register. Figure 44
shows how to program the AD7328 register to operate in
sequence mode.
After power-up, all of the four on-chip registers contain default
values. Each analog input has a default input range of ±10 V. If
different analog input ranges are required, a write to the range
registers is necessary. This is shown in the first two serial transfers
of Figure 44.
CS
FROM CHANNEL IN SEQUENCE.
SEQUENCE, Seq1 = 0, Seq2 = 0.
DOUT: CONVERSION RESULT
DIN: WRITE TO CONTROL
REGISTER TO STOP THE
CS
CS
CS
CS
CS
CS
Figure 44. Programmable Sequence Flowchart
A SEQUENCE.
DIN: TIE DIN LOW/WRITE BIT = 0TO CONTINUE TO CONVERT
DIN: WRITE TO RANGE REGISTER 1 TO SELECT THE RANGE
DIN: WRITE TO RANGE REGISTER 2 TO SELECT THE RANGE
STOPPING
DOUT: CONVERSION RESULT FROM FIRST CHANNEL IN
DIN: WRITE TO SEQUENCE REGISTER TO SELECT THE
DIN: WRITE TO SEQUENCE REGISTER TO SELECT THE
DOUT: CONVERSION RESULT FROM CHANNEL 0, ± 10V
DIN: WRITE TO CONTROL REGISTER TO START THE
DOUT: CONVERSION RESULT FROM CHANNEL X IN
DOUT: CONVERSION RESULT FROM CHANNEL 0,
DOUT: CONVERSION RESULT FROM CHANNEL 0,
DOUT: CONVERSION RESULT FROM CHANNEL 0,
ANALOG INPUT CHANNELS TO BE INCLUDED IN
Rev. A | Page 25 of 36
SINGLE-ENDED MODE, RANGE SELECTED IN
SINGLE-ENDED MODE, RANGE SELECTED IN
SINGLE-ENDED MODE, RANGE SELECTED IN
THROUGH THE SEQUENCE OF CHANNELS.
SELECTING A NEW SEQUENCE.
FOR EACH ANALOG INPUT CHANNEL.
FOR EACH ANALOG INPUT CHANNEL.
RANGE, SINGLE-ENDED MODE.
SEQUENCE, Seq1 = 0, Seq2 = 1.
THE FIRST SEQUENCE.
RANGE REGISTER 1.
RANGE REGISTER 1.
RANGE REGISTER 1.
NEW SEQUENCE.
THE SEQUENCE.
THE SEQUENCE.
POWER ON.
These two initial serial transfers are only necessary if input ranges
other than the default ranges are required. After the analog input
ranges are configured, a write to the sequence register is necessary
to select the channels to be included in the sequence. Once the
channels for the sequence have been selected, the sequence can
be initiated by writing to the control register and setting Seq1
to 0 and Seq2 to 1. The AD7328 continues to convert the selected
sequence without interruption provided that the sequence register
remains unchanged and Seq1 = 0 and Seq2 = 1 in the control
register.
ON THE SELECTED SEQUENCE
CONTINUOUSLY CONVERT
OF CHANNELS.
DIN TIED LOW/WRITE BIT = 0.
AD7328