AD7991 Analog Devices, AD7991 Datasheet - Page 2

• Manufacturer Part Number: AD7991
• Description: 4-Channel, 12-Bit ADC with I2C Compatible Interface in 8-Lead SOT-23
• Manufacturer: Analog Devices

Specifications of AD7991

• Resolution (bits): 12bit
• # Chan: 4
• Sample Rate: 140kSPS
• Interface: I²C/Ser 2-Wire
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref),Uni Vdd
• Adc Architecture: SAR
• Pkg Type: SOT

AD7991/AD7995/AD7999
TABLE OF CONTENTS
Features .............................................................................................. 1
Applications....................................................................................... 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings.......................................................... 11
Pin Configuration and Function Descriptions........................... 12
Typical Performance Characteristics ........................................... 13
Terminology .................................................................................... 16
Theory of Operation ...................................................................... 17
REVISION HISTORY
10/10—Rev. A to Rev. B
Changes to Max Offset Error Parameter in Table 2 ..................... 3
Changes to Max Offset Error Parameter (Y Version) in Table 3 ......5
Changes to Max Offset Error Parameter (Y Version) in Table 4 ......7
Changes to Ordering Guide...................................................................27
10/09—Rev. 0 to Rev. A
Changes to Table 3............................................................................ 5
Changes to Table 4............................................................................ 7
Updated Ordering Guide............................................................... 27
12/07—Revision 0: Initial Version
AD7991 .......................................................................................... 3
AD7995 .......................................................................................... 5
AD7999 .......................................................................................... 7
I
ESD Caution................................................................................ 11
2
C Timing Specifications............................................................ 9
Rev. B | Page 2 of 28
Internal Register Structure ............................................................ 20
Serial Interface ................................................................................ 22
Writing to the AD7991/AD7995/AD7999.................................. 23
Reading from the AD7991/AD7995/AD7999............................ 24
Mode of Operation......................................................................... 26
Outline Dimensions ....................................................................... 27
Converter Operation.................................................................. 17
Typical Connection Diagram ................................................... 18
Analog Input ............................................................................... 18
Configuration Register .............................................................. 20
Sample Delay and Bit Trial Delay............................................. 21
Conversion Result Register ....................................................... 21
Serial Bus Address...................................................................... 22
Placing the AD7991/AD7995/AD7999 into High
Speed Mode................................................................................. 25
Ordering Guide .......................................................................... 27