EVAL-AD7718EB Analog Devices Inc, EVAL-AD7718EB Datasheet - Page 12

• Manufacturer Part Number: EVAL-AD7718EB
• Description: BOARD EVAL FOR AD7718
• Manufacturer: Analog Devices Inc

Specifications of EVAL-AD7718EB

• Number Of Adc's: 1
• Number Of Bits: 24
• Sampling Rate (per Second): 1.37k
• Data Interface: Serial
• Inputs Per Adc: 10 Single Ended
• Input Range: ±2.5 V
• Power (typ) @ Conditions: 3.84mW @ 3 V
• Voltage Supply Source: Analog and Digital
• Operating Temperature: -40°C ~ 85°C
• Utilized Ic / Part: AD7718
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant

EVAL-AD7718-EB
The Status Register Screen
Fig. 11. shows the Status Register Screen. When the screen is loaded the software reads the current contents from
the Status Register of the AD7718 and sets the buttons accordingly. This is a read-only register and flags the
operating conditions of the AD7718 such as data ready or ADC Error. Refer to AD7718 datasheets for more
information.
The Mode Register Screen
The Mode Register Screen is shown in Fig. 10. When the screen is loaded the software reads the current contents
from the Mode Register of the AD7718 and sets the buttons accordingly. This screen allows the user to change
the operating mode of the AD7718, change the channel configuration, turn chopping on/off, select the reference
voltage and power down the crystal oscillator. When the user selects a calibration the software will start a
calibration by writing to the AD7718 (prompt user for input if system calibration) and then monitor the RDY
pin. A falling edge of the RDY pin will indicate that the calibration has been completed. After a calibration the
AD7718 is placed in the idle mode and the screen is updated to indicate this. Everytime a change is made, the
software writes the new conditions to the AD7718 and then reads back from the Mode Register for conformation.
The AD7718 should be powered-down or placed in Idle Mode before writing to Filter, ADC Control or
Calibration registers. The default status for the Mode register is 0 hex - refer to AD7718 datasheets for more
information.
Fig. 11. The Status Register Screen
Fig. 10. The Mode Register Screen
- 12 -
Rev. B