AD7997 Analog Devices, AD7997 Datasheet - Page 2

• Manufacturer Part Number: AD7997
• Description: 8-Channel, 10-Bit ADC with I2C Compatible Interface in 20-Lead TSSOP
• Manufacturer: Analog Devices

Specifications of AD7997

• Resolution (bits): 10bit
• # Chan: 8
• Sample Rate: 79kSPS
• Interface: I²C/Ser 2-Wire,Ser
• Analog Input Type: SE-Uni
• Ain Range: Uni (Vref)
• Adc Architecture: SAR
• Pkg Type: SOP

AD7997/AD7998
TABLE OF CONTENTS
AD7997 Specifications..................................................................... 3
AD7998 Specifications..................................................................... 5
I
Absolute Maximum Ratings............................................................ 9
Pin Configuration and Pin Function Descriptions.................... 10
Terminology .................................................................................... 11
Typical Performance Characteristics ........................................... 12
Circuit Information ........................................................................ 15
Internal Register Structure ............................................................ 18
Serial Interface ................................................................................ 23
REVISION HISTORY
9/04—Revision 0: Initial Version
2
C Timing Specifications ................................................................ 7
ESD Caution.................................................................................. 9
Converter Operation.................................................................. 15
Typical Connection Diagram ................................................... 16
Analog Input ............................................................................... 16
Address Pointer Register ........................................................... 18
Configuration Register .............................................................. 19
Conversion Result Register ....................................................... 20
Limit Registers ............................................................................ 20
Alert Status Register (CH1 to CH4) ........................................ 21
Cycle Timer Register.................................................................. 22
Sample Delay and Bit Trial Delay............................................. 22
Rev. 0 | Page 2 of 32
Writing to the AD7997/AD7998 .................................................. 24
Reading Data from the AD7997/AD7998................................... 26
ALERT/BUSY Pin .......................................................................... 27
Modes of Operation ....................................................................... 28
Outline Dimensions ....................................................................... 31
Serial Bus Address ...................................................................... 23
Writing to the Address Pointer Register for a Subsequent
Read.............................................................................................. 24
Writing a Single Byte of Data to the Alert Status Register or
Cycle Register.............................................................................. 24
Writing Two Bytes of Data to a Limit, Hysteresis, or
Configuration Register .............................................................. 24
SMBus ALERT ............................................................................ 27
BUSY ............................................................................................ 27
Placing the AD7997-1/AD7998-1 into High Speed Mode ... 27
The Address Select (AS) Pin ..................................................... 27
Mode 1—Using the CONVST Pin ........................................... 28
Mode 2 – COMMAND MODE ............................................... 29
Mode 3—Automatic Cycle Interval Mode.............................. 30
Ordering Guide .......................................................................... 31
Related Parts in I
2
C-Compatible ADC Product Family........ 31