link to page 17 link to page 17 AD8138Data SheetPIN CONFIGURATION AND FUNCTION DESCRIPTIONS–IN 18 +INVOCM 27 NCV+ 36 V–+OUT 45 –OUTAD8138 4 00 3- NC = NO CONNECT 07 01 Figure 4. Pin Configuration Table 7. Pin Function Descriptions Pin No.MnemonicDescription 1 −IN Negative Input Summing Node. 2 VOCM Voltage applied to this pin sets the common-mode output voltage with a ratio of 1:1. For example, 1 V dc on VOCM sets the dc bias level on +OUT and −OUT to 1 V. 3 V+ Positive Supply Voltage. 4 +OUT Positive Output. Note that the voltage at −DIN is inverted at +OUT (see Figure 42). 5 −OUT Negative Output. Note that the voltage at +DIN is inverted at −OUT (see Figure 42). 6 V− Negative Supply Voltage. 7 NC No Connect. 8 +IN Positive Input Summing Node. Rev. G | Page 8 of 24 Document Outline FEATURES APPLICATIONS PIN CONFIGURATION TYPICAL APPLICATION CIRCUIT GENERAL DESCRIPTION TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS ±DIN TO ±OUT SPECIFICATIONS VOCM TO ±OUT SPECIFICATIONS ±DIN TO ±OUT SPECIFICATIONS VOCM TO ±OUT SPECIFICATIONS ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE Maximum Power Dissipation ESD CAUTION PIN CONFIGURATION AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS OPERATIONAL DESCRIPTION DEFINITION OF TERMS 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 INPUT COMMON-MODE VOLTAGE RANGE IN SINGLE-SUPPLY APPLICATIONS SETTING THE OUTPUT COMMON-MODE VOLTAGE DRIVING A CAPACITIVE LOAD LAYOUT, GROUNDING, AND BYPASSING BALANCED TRANSFORMER DRIVER HIGH PERFORMANCE ADC DRIVING 3 V OPERATION OUTLINE DIMENSIONS ORDERING GUIDE
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