AD7921 Analog Devices, AD7921 Datasheet - Page 2

• Manufacturer Part Number: AD7921
• Description: 2-Channel, 2.35 V to 5.25 V, 250 kSPS, 12-Bit A/D Converter
• Manufacturer: Analog Devices

Specifications of AD7921

• Resolution (bits): 12bit
• # Chan: 2
• Sample Rate: 250kSPS
• Interface: Ser,SPI
• Analog Input Type: SE-Uni
• Ain Range: Uni Vdd
• Adc Architecture: SAR
• Pkg Type: SOP,SOT

AD7911/AD7921
TABLE OF CONTENTS
Specifications..................................................................................... 3
Absolute Maximum Ratings............................................................ 9
Pin Configurations and Function Descriptions ......................... 10
Terminology .................................................................................... 11
Typical Performance Characteristics ........................................... 13
Circuit Information ........................................................................ 15
REVISION HISTORY
5/11—Rev. 0 to Rev. A
Updated Outline Dimensions ....................................................... 25
Changes to Ordering Guide .......................................................... 25
4/04—Revision 0: Initial Version
AD7911 Specifications................................................................. 3
AD7921 Specifications................................................................. 5
Timing Specifications .................................................................. 7
Timing Diagrams.......................................................................... 7
Timing Examples.......................................................................... 8
ESD Caution.................................................................................. 9
Converter Operation.................................................................. 15
ADC Transfer Function............................................................. 15
Typical Connection Diagram ................................................... 16
Rev. A | Page 2 of 28
Modes of Operation ....................................................................... 18
Serial Interface ................................................................................ 21
Application Hints ........................................................................... 24
Outline Dimensions ....................................................................... 25
Analog Input ............................................................................... 16
Digital Inputs .............................................................................. 17
DIN Input.................................................................................... 17
DOUT Output ............................................................................ 17
Normal Mode.............................................................................. 18
Power-Down Mode .................................................................... 18
Power-Up Time .......................................................................... 19
Power vs. Throughput Rate....................................................... 20
Microprocessor Interfacing....................................................... 22
Grounding and Layout .............................................................. 24
Ordering Guide .......................................................................... 25