Datasheet AD7993, AD7994 (Analog Devices) - 2

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AD7993/AD7994 TABLE OF CONTENTS
AD7993 Specifications... 3 Serial Interface .. 23 AD7994 Specifications... 5 Serial Bus Address.. 23 I2C Timing Specifications .. 7 Writing to the AD7993/AD7994 .. 24 Absolute Maximum Ratings.. 9 Writing to the Address Pointer Register for a Subsequent Read.. 24 ESD Caution.. 9 Writing a Single Byte of Data to the Alert Status Register or Pin Configuration and Pin Function Descriptions.. 10 Cycle Register.. 24 Terminology .. 11 Writing Two Bytes of Data to a Limit or Hysteresis Register .. 24 Typical Performance Characteristics ... 12 Reading Data from the AD7993/AD7994... 26 Circuit Information .. 15 Alert/Busy Pin... 27 Converter Operation.. 15 SMBus Alert .. 27 Typical Connection Diagram ... 16 Busy .. 27 Analog Input ... 16 Placing the AD7993-1/AD7994-1 into High Speed Mode ... 27 Internal Register Structure .. 18 The Address Select (AS) Pin ... 27 Address Pointer Register ... 18 Modes of Operation ... 28 Configuration Register .. 19 Mode 1—Using the CONVST Pin ... 28 Conversion Result Register ... 20 Mode 2—Command Mode... 29 Limit Registers .. 20 Mode 3—Automatic Cycle Interval Mode.. 30 Alert Status Register... 21 Outline Dimensions ... 31 Cycle Timer Register.. 22 Ordering Guide .. 31 Sample Delay and Bit Trial Delay... 22 Related Parts in I2C-Compatible ADC Product Family.. 31
REVISION HISTORY 10/04—Revision 0: Initial Version
Rev. 0 | Page 2 of 32 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS AD7993 SPECIFICATIONS AD7994 SPECIFICATIONS I2C TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION PIN CONFIGURATION AND PIN FUNCTION DESCRIPTIONS TERMINOLOGY TYPICAL PERFORMANCE CHARACTERISTICS CIRCUIT INFORMATION CONVERTER OPERATION TYPICAL CONNECTION DIAGRAM ANALOG INPUT INTERNAL REGISTER STRUCTURE ADDRESS POINTER REGISTER CONFIGURATION REGISTER CONVERSION RESULT REGISTER LIMIT REGISTERS ALERT STATUS REGISTER CYCLE TIMER REGISTER SAMPLE DELAY AND BIT TRIAL DELAY SERIAL INTERFACE SERIAL BUS ADDRESS WRITING TO THE AD7993/AD7994 WRITING TO THE ADDRESS POINTER REGISTER FOR A SUBSEQUENT REA WRITING A SINGLE BYTE OF DATA TO THE ALERT STATUS REGISTER O WRITING TWO BYTES OF DATA TO A LIMIT OR HYSTERESIS REGISTER READING DATA FROM THE AD7993/AD7994 ALERT/BUSY PIN SMBus ALERT BUSY PLACING THE AD7993-1/AD7994-1 INTO HIGH SPEED MODE THE ADDRESS SELECT (AS) PIN MODES OF OPERATION MODE 1—USING THE CONVST PIN MODE 2—COMMAND MODE MODE 3—AUTOMATIC CYCLE INTERVAL MODE OUTLINE DIMENSIONS ORDERING GUIDE RELATED PARTS IN I2C-COMPATIBLE ADC PRODUCT FAMILY