AD7291 Analog Devices, AD7291 Datasheet - Page 2

• Manufacturer Part Number: AD7291
• Description: 8-Channel, I2C, 12-Bit SAR ADC with Temperature Sensor
• Manufacturer: Analog Devices

Specifications of AD7291

• Resolution (bits): 12bit
• # Chan: 8
• Sample Rate: 22.2kSPS
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: CSP

AD7291
TABLE OF CONTENTS
Features .............................................................................................. 1
Functional Block Diagram .............................................................. 1
General Description ......................................................................... 1
Product Highlights ........................................................................... 1
Revision History ............................................................................... 2
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 6
Pin Configuration and Function Descriptions............................. 7
Typical Performance Characteristics ............................................. 8
Terminology .................................................................................... 11
Circuit Information ........................................................................ 12
Internal Register Structure ............................................................ 15
REVISION HISTORY
10/11—Rev. A to Rev. B
Changes to Table 9.......................................................................... 16
8/11—Rev. 0 to Rev. A
Changes to Temperature Sensor—Internal, Accuracy Parameter,
Table 2 ................................................................................................ 3
1/11—Revision 0: Initial Version
I
Thermal Resistance ...................................................................... 6
ESD Caution.................................................................................. 6
Converter Operation.................................................................. 12
Analog Input ............................................................................... 12
ADC Transfer Function............................................................. 13
Temperature Sensor Operation ................................................ 13
Temperature Sensor Averaging................................................. 13
V
The Internal or External Reference.......................................... 14
Reset ............................................................................................. 14
2
C Timing Specifications............................................................ 5
DRIVE
............................................................................................ 14
Rev. B | Page 2 of 28
I
Writing to the AD7291 .................................................................. 22
Reading Data From the AD7291.................................................. 23
Modes of Operation ....................................................................... 24
Outline Dimensions ....................................................................... 27
2
C Interface .................................................................................... 21
Address Pointer Register ........................................................... 15
Command Register (0x00)........................................................ 17
Voltage Conversion Result Register (0x01) ............................ 18
T
T
Limit Registers (0x04 to 0x1E) ................................................. 19
Hysteresis Register ..................................................................... 20
Alert Status Register A and Alert Status Register B (0x1F and
0x20)............................................................................................. 20
Serial Bus Address Byte ............................................................. 21
General I
Writing Two Bytes of Data to a 16-Bit Register ..................... 22
Writing to Multiple Registers.................................................... 22
Reading Two Bytes of Data from a 16-Bit Register ............... 23
Command Mode ........................................................................ 24
Autocycle Mode.......................................................................... 26
Ordering Guide .......................................................................... 27
SENSE
SENSE
Conversion Result Register (0x02)................................ 18
Average Result Register (0x03)...................................... 19
2
C Timing.................................................................... 21
Data Sheet