Datasheet AD7298 (Analog Devices) - 3

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AD7298 TABLE OF CONTENTS
Features .. 1 Temperature Sensor Averaging .. 14 General Description ... 1 VDRIVE.. 15 Functional Block Diagram .. 1 The Internal or External Reference.. 15 Product Highlights ... 1 Control Register.. 16 Revision History ... 2 Modes of Operation ... 17 Specifications... 3 Traditional Multichannel Mode of Operation.. 17 Timing Specifications .. 5 Repeat Operation ... 18 Absolute Maximum Ratings.. 6 Power-Down Modes .. 19 ESD Caution.. 6 Powering Up the AD7298 ... 20 Thermal Resistance .. 6 Reset ... 20 Pin Configuration and Function Description .. 7 Serial Interface .. 21 Typical Performance Characteristics ... 9 Temperature Sensor Read ... 22 Terminology .. 12 Layout and Configuration... 23 Circuit Information .. 13 Power Supply Bypassing and Grounding.. 23 Converter Operation.. 13 Temperature Monitoring... 23 Analog Input ... 13 Outline Dimensions ... 24 Temperature Sensor Operation .. 14 Ordering Guide .. 24
REVISION HISTORY 6/11—Rev. A to Rev. B
Changes to Internal Temperature Sensor, Accuracy Parameter in Table 1.. 3
1/11—Rev. 0 to Rev. A
Removed Input Impedance Parameter .. 3 Added Input Capacitance Parameter of 8 pF.. 3 Changes to Figure 11.. 10 Changed C1 Value to 8 pF in Analog Input Section.. 13 Changes to Figure 23.. 14 Changes to Ordering Guide .. 24
9/10—Revision 0: Initial Version
Rev. B | Page 2 of 24 Document Outline FEATURES GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAM PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS TIMING SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION THERMAL RESISTANCE PIN CONFIGURATION AND FUNCTION DESCRIPTION TYPICAL PERFORMANCE CHARACTERISTICS TERMINOLOGY CIRCUIT INFORMATION CONVERTER OPERATION ANALOG INPUT ADC Transfer Function TEMPERATURE SENSOR OPERATION TEMPERATURE SENSOR AVERAGING Temperature Value Format VDRIVE THE INTERNAL OR EXTERNAL REFERENCE CONTROL REGISTER MODES OF OPERATION TRADITIONAL MULTICHANNEL MODE OF OPERATION REPEAT OPERATION POWER-DOWN MODES Normal Mode Partial Power-Down Mode Full Power-Down Mode POWERING UP THE AD7298 RESET SERIAL INTERFACE TEMPERATURE SENSOR READ LAYOUT AND CONFIGURATION POWER SUPPLY BYPASSING AND GROUNDING TEMPERATURE MONITORING OUTLINE DIMENSIONS ORDERING GUIDE