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 3 link to page 5 link to page 7 link to page 7 link to page 7 link to page 8 link to page 9 link to page 17 link to page 18 link to page 19 link to page 19 link to page 19 link to page 19 link to page 20 link to page 20 link to page 20 link to page 20 link to page 21 link to page 21 link to page 23 link to page 24 link to page 25 link to page 25 link to page 26 ADA4938-1/ADA4938-2Data SheetTABLE OF CONTENTS Features .. 1 Theory of Operation .. 19 Applications ... 1 Analyzing an Application Circuit .. 19 General Description ... 1 Setting the Closed-Loop Gain .. 19 Functional Block Diagrams ... 1 Estimating the Output Noise Voltage .. 19 Revision History ... 2 The Impact of Mismatches in the Feedback Networks ... 20 Specifications ... 3 Calculating the Input Impedance of an Application Circuit ... 20 Dual-Supply Operation ... 3 Input Common-Mode Voltage Range in Single-Supply Single-Supply Operation ... 5 Applications .. 20 Absolute Maximum Ratings .. 7 Terminating a Single-Ended Input .. 21 Thermal Resistance .. 7 Setting the Output Common-Mode Voltage .. 21 ESD Caution .. 7 Layout, Grounding, and Bypassing .. 23 Pin Configurations and Function Descriptions ... 8 High Performance ADC Driving ... 24 Typical Performance Characteristics ... 9 Outline Dimensions ... 25 Test Circuts .. 17 Ordering Guide .. 25 Terminology .. 18 REVISION HISTORY Added Settling Time Parameter, Table 3 .. 5 6/2016—Rev. A to Rev. B Changes to Linear Output Current Parameter, Table 3 .. 5 Changed CP-16-2 to CP-16-21, CP-24-1 to CP-24-10 .. Throughout Changes to Figure 5 and Figure 6 .. 8 Changed ADA4938-x to ADA4938-1/ADA4938-2 .. Throughout Added EP Row to Table 7 and EP Row to Table 8 .. 8 Changes to Figure 1 and Figure 2 ... 1 Changes to Figure 41 .. 14 Changes to Figure 5 and Figure 6 ... 8 Added New Figure 53, Renumbered Sequentially ... 16 Updated Outline Dimensions ... 25 Changes to Table 9 .. 19 Changes to Ordering Guide .. 25 Added Exposed Pad Notation to Outline Dimensions ... 25 Changes to Ordering Guide .. 25 10/2009—Rev. 0 to Rev. A Added Settling Time Parameter, Table 1 ... 3 11/2007—Revision 0: Initial Version Changes to Linear Output Current Parameter, Table 1 ... 3 Rev. B | Page 2 of 26 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS REVISION HISTORY SPECIFICATIONS DUAL-SUPPLY OPERATION ±DIN to ±OUT Performance VOCM to ±OUT Performance SINGLE-SUPPLY OPERATION ±DIN to ±OUT Performance VOCM to ±OUT Performance ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Maximum Power Dissipation ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUTS TERMINOLOGY THEORY OF OPERATION ANALYZING AN APPLICATION CIRCUIT SETTING THE CLOSED-LOOP GAIN ESTIMATING THE OUTPUT NOISE VOLTAGE THE IMPACT OF MISMATCHES IN THE FEEDBACK NETWORKS CALCULATING THE INPUT IMPEDANCE OF AN APPLICATION CIRCUIT INPUT COMMON-MODE VOLTAGE RANGE IN SINGLE-SUPPLY APPLICATIONS TERMINATING A SINGLE-ENDED INPUT SETTING THE OUTPUT COMMON-MODE VOLTAGE LAYOUT, GROUNDING, AND BYPASSING HIGH PERFORMANCE ADC DRIVING OUTLINE DIMENSIONS ORDERING GUIDE
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