Datasheet ADA4939-1/ADA4939-2 (Analog Devices) - 8

ADA4939-1/ADA4939-2 Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS 1 1 1 1 1 T 1 S S S S N B S S U PIN 1 V V I F D + V V – – – P O– INDICATOR – – V– V– 6 4 3 2 1 0 2 2 2 2 9 2 1 51 41 31 1 –IN1 1 18 +OUT1 –FB 1 12 PD +FB1 2 17 VOCM1 +IN 2 11 –OUT ADA4939-1 +VS1 3 ADA4939-2 16 –VS2 –IN 3 TOP VIEW 10 +OUT +V 4 TOP VIEW 15 –V (Not to Scale) S1 S2 (Not to Scale) +FB 4 9 V –FB2 5 14 PD2 OCM +IN2 6 13 –OUT2 5 6 7 8 7 8 9 0 1 2 S S S S 1 1 1 V V V V + + + + 2 2 2 2 2 2 NI B S S M T
5
V V NOTES – F C U + + + O
-00
O
9
1. EXPOSED PAD. THE EXPOSED PAD V +
42
MUST BE CONNECTED TO GROUND. NOTES
07 -006
1. EXPOSED PAD. THE EXPOSED PAD
29
MUST BE CONNECTED TO GROUND.
074 Figure 5. ADA4939-1 Pin Configuration Figure 6. ADA4939-2 Pin Configuration
Table 9. ADA4939-1 Pi n Function Descriptions Pin No. Mnemonic Description
1 −FB Negative Output for Feedback Component Connection 2 +IN Positive Input Summing Node 3 −IN Negative Input Summing Node 4 +FB Positive Output for Feedback Component Connection 5 to 8 +VS Positive Supply Voltage 9 VOCM Output Common-Mode Voltage 10 +OUT Positive Output for Load Connection 11 −OUT Negative Output for Load Connection 12 PD Power-Down Pin 13 to 16 −VS Negative Supply Voltage EPAD Exposed Pad. The exposed pad must be connected to ground.
Table 10. ADA4939-2 Pin Function Descriptions Pin No. Mnemonic Description
1 −IN1 Negative Input Summing Node 1 2 +FB1 Positive Output Feedback 1 3, 4 +VS1 Positive Supply Voltage 1 5 −FB2 Negative Output Feedback 2 6 +IN2 Positive Input Summing Node 2 7 −IN2 Negative Input Summing Node 2 8 +FB2 Positive Output Feedback 2 9, 10 +VS2 Positive Supply Voltage 2 11 VOCM2 Output Common-Mode Voltage 2 12 +OUT2 Positive Output 2 13 −OUT2 Negative Output 2 14 PD2 Power-Down Pin 2 15, 16 −VS2 Negative Supply Voltage 2 17 VOCM1 Output Common-Mode Voltage 1 18 +OUT1 Positive Output 1 19 −OUT1 Negative Output 1 20 PD1 Power-Down Pin 1 21, 22 −VS1 Negative Supply Voltage 1 23 −FB1 Negative Output Feedback 1 24 +IN1 Positive Input Summing Node 1 EPAD Exposed Pad. The exposed pad must be connected to ground. Rev. A | Page 8 of 24 Document Outline FEATURES APPLICATIONS GENERAL DESCRIPTION FUNCTIONAL BLOCK DIAGRAMS TABLE OF CONTENTS REVISION HISTORY SPECIFICATIONS 5 V OPERATION ±DIN to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance 3.3 V OPERATION ±DIN to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance ABSOLUTE MAXIMUM RATINGS THERMAL RESISTANCE MAXIMUM POWER DISSIPATION ESD CAUTION PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS TYPICAL PERFORMANCE CHARACTERISTICS TEST CIRCUITS OPERATIONAL DESCRIPTION DEFINITION OF TERMS Differential Voltage Common-Mode Voltage Balance THEORY OF OPERATION ANALYZING AN APPLICATION CIRCUIT SETTING THE CLOSED-LOOP GAIN STABLE FOR GAINS ≥2 ESTIMATING THE OUTPUT NOISE VOLTAGE IMPACT OF MISMATCHES IN THE FEEDBACK NETWORKS CALCULATING THE INPUT IMPEDANCE FOR AN APPLICATION CIRCUIT Terminating a Single-Ended Input INPUT COMMON-MODE VOLTAGE RANGE INPUT AND OUTPUT CAPACITIVE AC COUPLING MINIMUM RG VALUE OF 50 Ω SETTING THE OUTPUT COMMON-MODE VOLTAGE LAYOUT, GROUNDING, AND BYPASSING HIGH PERFORMANCE ADC DRIVING OUTLINE DIMENSIONS ORDERING GUIDE