link to page 1 link to page 1 link to page 1 link to page 1 link to page 1 link to page 2 link to page 3 link to page 5 link to page 5 link to page 6 link to page 10 link to page 10 link to page 10 link to page 11 link to page 12 link to page 12 link to page 12 link to page 13 link to page 13 link to page 13 link to page 13 link to page 14 link to page 15 link to page 16 link to page 18 link to page 18 AD549Data SheetTABLE OF CONTENTS Features .. 1 Offset Nulling ... 11 Applications ... 1 AC Response with High Value Source and Feedback Connection Diagram ... 1 Resistance .. 12 General Description ... 1 Common-Mode Input Voltage Overload .. 12 Product Highlights ... 1 Differential Input Voltage Overload .. 13 Revision History ... 2 Input Protection ... 13 Specifications ... 3 Sample-and-Difference Circuit to Measure Electrometer Leakage Currents .. 13 Absolute Maximum Ratings .. 5 Photodiode Interface ... 14 ESD Caution .. 5 Log Ratio Amplifier ... 15 Typical Performance Characteristics ... 6 Temperature Compensated pH Probe Amplifier ... 16 Functional Description .. 10 Outline Dimensions ... 18 Minimizing Input Current .. 10 Ordering Guide .. 18 Circuit Board Notes ... 10 REVISION HISTORY2/15—Rev. J to Rev. K7/07—Rev. F to Rev. G Updated Outline Dimensions ... 18 Changes to Figure 45 .. 16 12/14—Rev. I to Rev. J Changes to Temperature Compensated pH Probe Amplifier Section.. 17 Added L Model ... Universal Changes to Figure 46 .. 17 Changes to Features Section and Applications Section ... 1 Changes to Ordering Guide .. 18 Changes to Table 1 .. 3 Changes to Table 2 .. 5 5/06—Rev. E to Rev. F Changes to Log Ratio Amplifier Section ... 15 Removed ESD Caution ... 5 Changes to Temperature Compensated pH Probe 8/05—Rev. D to Rev. E Amplifier Section .. 16 Changes to Ordering Guide .. 18 Change to Figure 22 .. 9 6/14—Rev. H to Rev. I5/04—Rev. C to Rev. D Deleted L Model... Throughout Updated Format .. Universal Change to Features Section ... 1 Changes to Features .. 1 Changes to Input Offset Voltage Parameter and Input Voltage Updated Outline Dimensions ... 18 Noise Parameter, Table 1 .. 3 Added Ordering Guide .. 18 Changes to Ordering Guide .. 18 10/02—Rev. B to Rev. C3/08—Rev. G to Rev. H Deleted Product Highlights #5 .. 1 Changes to Features .. 1 Edits to Specifications ... 3 Changes to Figure 1 .. 1 Deleted Metallization Photograph .. 3 Deleted Package Option Parameter ... 4 Updated Outline Dimensions ... 13 Inserted ESD Caution .. 5 7/02—Rev. A to Rev. B Changes to Figure 2, Figure 3, and Figure 7.. 6 Edits to Specifications ... 2 Changes to Figure 11 .. 7 Changes to Figure 17 .. 8 Changes to Figure 41 .. 14 Rev. K | Page 2 of 18 Document Outline FEATURES APPLICATIONS CONNECTION DIAGRAM GENERAL DESCRIPTION PRODUCT HIGHLIGHTS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS ESD CAUTION TYPICAL PERFORMANCE CHARACTERISTICS FUNCTIONAL DESCRIPTION MINIMIZING INPUT CURRENT CIRCUIT BOARD NOTES OFFSET NULLING AC RESPONSE WITH HIGH VALUE SOURCE AND FEEDBACK RESISTANCE COMMON-MODE INPUT VOLTAGE OVERLOAD DIFFERENTIAL INPUT VOLTAGE OVERLOAD INPUT PROTECTION SAMPLE-AND-DIFFERENCE CIRCUIT TO MEASURE ELECTROMETER LEAKAGE CURRENTS PHOTODIODE INTERFACE Photodiode Preamp Noise LOG RATIO AMPLIFIER TEMPERATURE COMPENSATED pH PROBE AMPLIFIER OUTLINE DIMENSIONS ORDERING GUIDE
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