Datasheet ADA4950-1/ADA4950-2 (Analog Devices) - 8

ADA4950-1/ADA4950-2 Data Sheet PIN CONFIGURATIONS AND FUNCTION DESCRIPTIONS 1 S S S S S1 S1 UT NA1 NB1 I I D1 –V –V –V –V + + –V –V P –O 24 23 22 21 20 19 16 15 14 13 –INA1 1 18 +OUT1 +INB 1 12 PD –INB1 2 17 VOCM1 +INA 2 11 –OUT ADA4950-1 +V 3 ADA4950-2 16 S1 –VS2 TOP VIEW +V TOP VIEW 15 –V –INA 3 10 +OUT 4 S1 S2 (Not to Scale) (Not to Scale) +INB2 5 14 PD2 –INB 4 9 VOCM +INA2 6 13 –OUT2 5 6 7 8 7 8 9 10 11 12 S S S S 2 +V +V +V +V S2 S2 T2 NA2 NB2 CM +V +V NOTES –I –I OV OU+ 1. SOLDER THE EXPOSED PADDLE ON THE BACK OF
005
THE PACKAGE TO A GROUND PLANE OR TO A NOTES POWER PLANE. 1. SOLDER THE EXPOSED PADDLE ON THE BACK OF
006 07957-
THE PACKAGE TO A GROUND PLANE OR TO A POWER PLANE.
07957- Figure 5. ADA4950-1 Pin Configuration Figure 6. ADA4950-2 Pin Configuration
Table 9. ADA4950-1 P in Function Descriptions Pin No. Mnemonic Description
1 +INB Positive Input B, 250 Ω Input. Use alone for G = 2 or tie to +INA for G = 3. 2 +INA Positive Input A, 500 Ω Input. Use alone for G = 1 or tie to +INB for G = 3. 3 −INA Negative Input A, 500 Ω Input. Use alone for G = 1 or tie to −INB for G = 3. 4 −INB Negative Input B, 250 Ω Input. Use alone for G = 2 or tie to −INA for G = 3. 5 to 8 +VS Positive Supply Voltage. 9 VOCM Output Common-Mode Voltage. 10 +OUT Positive Output. 11 −OUT Negative Output. 12 PD Power-Down Pin. 13 to 16 −VS Negative Supply Voltage. 17 (EPAD) Exposed Paddle (EPAD) Solder the exposed paddle on the back of the package to a ground plane or to a power plane.
Table 10. ADA4950-2 Pin Function Descriptions Pin No. Mnemonic Description
1 −INA1 Negative Input A, Amplifier 1, 500 Ω Input. Use alone for G = 1 or tie to –INB1 for G = 3. 2 −INB1 Negative Input B, Amplifier 1, 250 Ω Input. Use alone for G = 2 or tie to –INA1 for G = 3. 3, 4 +VS1 Positive Supply Voltage, Amplifier 1. 5 +INB2 Positive Input B, Amplifier 2, 250 Ω Input. Use alone for G = 2 or tie to +INA2 for G = 3. 6 +INA2 Positive Input A, Amplifier 2, 500 Ω Input. Use alone for G = 1 or tie to +INB2 for G = 3. 7 −INA2 Negative Input A, Amplifier 2, 500 Ω Input. Use alone for G = 1 or tie to –INB2 for G = 3. 8 −INB2 Negative Input B, Amplifier 2, 250 Ω Input. Use alone for G = 2 or tie to –INA2 for G = 3. 9, 10 +VS2 Positive Supply Voltage, Amplifier 2. 11 VOCM2 Output Common-Mode Voltage, Amplifier 2. 12 +OUT2 Positive Output, Amplifier 2. 13 −OUT2 Negative Output, Amplifier 2. 14 PD2 Power-Down Pin, Amplifier 2. 15, 16 −VS2 Negative Supply Voltage, Amplifier 2. 17 VOCM1 Output Common-Mode Voltage, Amplifier 1. 18 +OUT1 Positive Output, Amplifier 1. 19 −OUT1 Negative Output, Amplifier 1. 20 PD1 Power-Down Pin, Amplifier 1. 21, 22 −VS1 Negative Supply Voltage, Amplifier 1. 23 +INB1 Positive Input B, Amplifier 1, 250 Ω Input. Use alone for G = 2 or tie to +INA1 for G = 3. 24 +INA1 Positive Input A, Amplifier 1, 500 Ω Input. Use alone for G = 1 or tie to +INB1 for G = 3. 25 (EPAD) Exposed Paddle (EPAD) Solder the exposed paddle on the back of the package to a ground plane or to a power plane. Rev. B | Page 8 of 26 Document Outline Features Applications General Description Functional Block Diagrams Table of Contents Revision History Specifications ±5 V Operation Differential Inputs to VOUT, dm Performance VOCM to VOUT, cm Performance General Performance 5 V Operation Differential Inputs 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 Terminology Theory of Operation Applications Information Analyzing an Application Circuit Selecting the Closed-Loop Gain Estimating the Output Noise Voltage Calculating the Input Impedance for an Application Circuit Terminating a Single-Ended Input Input Common-Mode Voltage Range Input and Output Capacitive AC Coupling Input Signal Swing Considerations Setting the Output Common-Mode Voltage Layout, Grounding, and Bypassing High Performance ADC Driving Outline Dimensions Ordering Guide