ADA4937-1 Analog Devices, ADA4937-1 Datasheet
ADA4937-1
Available stocks
Related parts for ADA4937-1
ADA4937-1 Summary of contents
Page 1
... ADA4937-1 make it well suited for a wide variety of data acquisition and signal processing applications. The ADA4937-1 is available in a Pb-free × 16-lead LFCSP. The pinout has been optimized to facilitate PCB layout and minimize distortion. The part is specified to operate over the − ...
Page 2
... ADA4937-1 TABLE OF CONTENTS Features .............................................................................................. 1 Applications....................................................................................... 1 Functional Block Diagram .............................................................. 1 General Description ......................................................................... 1 Revision History ............................................................................... 2 Specifications..................................................................................... Operation ............................................................................... 3 3.3 V Operation ............................................................................ 5 Absolute Maximum Ratings............................................................ 7 Thermal Resistance ...................................................................... 7 ESD Caution.................................................................................. 7 Pin Configuration and Function Descriptions............................. 8 Typical Performance Characteristics ............................................. 9 Test Circuits..................................................................................... 16 Operational Description................................................................ 17 Definition of Terms.................................................................... 17 REVISION HISTORY 5/07—Revision 0: Initial Version Theory of Operation ...
Page 3
... kΩ 0 >100 −61 ADA4937-1 Max Unit MHz MHz MHz V/μs ns dBc dBc dBc dBc dBc dBc dBc nV/√Hz pA/√Hz dB +2.5 mV μV/°C −10 μA μA/°C +2 μA MΩ ...
Page 4
... ADA4937-1 Table ±OUT Performance OCM Parameter V DYNAMIC PERFORMANCE OCM −3 dB Bandwidth Slew Rate Input Voltage Noise (RTI) V INPUT CHARACTERISTICS OCM Input Voltage Range Input Resistance Input Offset Voltage Input Bias Current V CMRR OCM Gain POWER SUPPLY Operating Range Quiescent Current ...
Page 5
... IN, cm Maximum ∆V ; single-ended output OUT ∆V /∆V ; ∆ MHz; OUT, cm OUT, dm OUT, dm see Figure 44 for test circuit Rev Page ADA4937 kΩ, unless otherwise noted. All L, dm Min Typ Max 1900 200 1300 4000 <1 −106 −88 −81 − ...
Page 6
... ADA4937-1 Table ±OUT Performance OCM Parameter V DYNAMIC PERFORMANCE OCM −3 dB Bandwidth Slew Rate Input Voltage Noise (RTI) V INPUT CHARACTERISTICS OCM Input Voltage Range Input Resistance Input Offset Voltage Input Bias Current V CMRR OCM Gain POWER SUPPLY Operating Range Quiescent Current ...
Page 7
... Table 6. Thermal Resistance Package Type θ 16-Lead LFCSP (Exposed Pad) 95 Maximum Power Dissipation The maximum safe power dissipation in the ADA4937-1 package is limited by the associated rise in junction temperature ( the die. At approximately 150°C, J which is the glass transition temperature, the plastic changes its properties. Even temporarily exceeding this ...
Page 8
... V OCM 10 +OUT 11 −OUT −V S PIN 1 INDICATOR 12 PD –FB 1 ADA4937-1 + –OUT TOP VIEW – +OUT (Not to Scale) + OCM Figure 4. Pin Configuration Description Negative Output for Feedback Component Connection. Positive Input Summing Node. Negative Input Summing Node. ...
Page 9
... Figure 8. Large Signal Frequency Response for Various Gains 3. 5. –3 –6 –9 –12 – 100 FREQUENCY (MHz) Figure 9. Large Signal Frequency Response for Various Supplies 6 +105°C +25°C –40° –3 –6 –9 – 100 FREQUENCY (MHz) ADA4937-1 1000 1000 1000 ...
Page 10
... ADA4937 1kΩ 100Ω 200Ω –3 –6 – 100 FREQUENCY (MHz) Figure 11. Small Signal Frequency Response for Various Loads 100 mV p-p OUT 3.3V 3.3V 3.3V –3 –6 –9 –12 – ...
Page 11
... Figure 21. Harmonic Distortion vs. Frequency and Load –50 –60 –70 –80 –90 –100 –110 –120 10 0 –130 –1 Figure 22. Harmonic Distortion vs. V Rev Page ADA4937-1 HD2 + 200Ω F HD3 + 200Ω F HD2 + 402Ω F HD3 + 402Ω ...
Page 12
... ADA4937-1 –30 HD2 10MHz HD3 10MHz –40 HD2 75MHz HD3 75MHz –50 –60 –70 –80 –90 –100 –110 –120 1.0 1.5 2.0 2.5 V (V) OCM Figure 23. Harmonic Distortion vs. V –40 HD2 30MHz HD3 30MHz HD2 75MHz –50 HD3 75MHz –60 –70 –80 –90 –100 1.1 1.2 1.3 1.4 1.5 1.6 V (V) OCM Figure 24 ...
Page 13
... Figure 33. Overdrive Recovery Time (Pulse Input –1 –2 –3 –4 –5 100 0 Figure 34. Overdrive Amplitude Characteristics (Triangle Wave Input) Rev Page ADA4937 100 FREQUENCY (MHz) Figure 32. Noise Figure vs. Frequency TIME (2ns/DIV) V × DIFF OUT 100 200 ...
Page 14
... ADA4937 +25° 0°C 15 –40° 1.0 1.1 1.2 1.3 1.4 1.5 1.6 POWER-DOWN VOLTAGE (V) Figure 35. Supply Current vs. PD for Various Temperatures 0.20 0.15 0.10 0.05 0 –0.05 –0.10 –0.15 –0.20 TIME (1ns/DIV) Figure 36. Small Signal Pulse Response 2.60 2.58 2.56 2.54 2.52 2.50 2.48 2.46 2.44 2.42 2.40 TIME (2ns/DIV) Figure 37. Small Signal V Pulse Response OCM +105°C +55° ...
Page 15
... PD INPUT 2.0 1.8 1.6 1.4 1.2 1.0 0.8 0.6 0.4 SINGLE OUTPUT 0.2 0 TIME (150ns/DIV) Figure 41. PD Response vs. Time 100 100 1k Figure 42. Voltage Spectral Noise Density, RTI Rev Page ADA4937-1 10k 100k 1M 10M FREQUENCY (Hz) ...
Page 16
... OCM 200Ω 27.5Ω 200Ω Figure 44. Test Circuit for Output Balance 200Ω 5V 50Ω 200Ω FILTER V ADA4937-1 61.9Ω OCM 200Ω 27.5Ω 200Ω Figure 45. Test Circuit for Distortion Measurements Rev Page 1kΩ 50Ω 50Ω 0.1µF 412Ω ...
Page 17
... Figure 44). By this definition, output balance is the magnitude of the output common-mode voltage divided by the magnitude of the output differential mode voltage. Output Rev Page ADA4937 )/2 +OUT −OUT V ...
Page 18
... ADA4937-1 behaves much like a standard voltage feedback op amp and makes it easier to perform single-ended-to-differential conversions, common-mode level shifting, and amplifications of differential signals. Also like an op amp, the ADA4937-1 has high input impedance and low output impedance. Two feedback loops are employed to control the differential and common-mode output voltages ...
Page 19
... − ⎜ ⎟ × + ⎝ ⎠ OCM ADA4937 pin of the ADA4937-1 is internally biased at a voltage OCM input is driven by a low impedance OCM ADA4937-1 OUT OUT, dm ...
Page 20
... The input impedance of the V pin is approximately 10 kΩ. If multiple OCM ADA4937-1 devices share one reference output recommended that a buffer be used. Table 9 and Table 10 list several common gain settings, associated resistor values, input impedance, output noise density, and approximate large signal bandwidth for both balanced and unbalanced input configurations ...
Page 21
... LAYOUT, GROUNDING, AND BYPASSING As a high speed device, the ADA4937-1 is sensitive to the PCB environment in which it operates. Realizing its superior performance requires attention to the details of high speed PCB design. The first requirement is a solid ground plane that covers as much of the board area around the ADA4937-1 as possible. ...
Page 22
... The ADA4937-1 eliminates the need for a transformer to drive the ADC and performs a single-ended- to-differential conversion and buffering of the driving signal. The ADA4937-1 is configured with a single 5 V supply and unity gain for a single-ended input to differential output. The 61.9 Ω termination resistor, in parallel with the single-ended input impedance of 267 Ω ...
Page 23
... The ADA4937-1 performs the single-ended-to- differential conversion, eliminating the need for a transformer to drive the ADC. The ADA4937-1 is configured with a single 5 V supply and a gain of ~2 V/V for a single-ended input to differential output. The 76.8 Ω termination resistor, in parallel with the single- ended input impedance of 137 Ω, provides a 50 Ω ac termination for the source. The additional 30 Ω ...
Page 24
... AD9230, and sets the output common mode of the ADA4937-1 at 1.4 V. One-third of the output common-mode voltage of the amplifier is fed back to the summing nodes, biasing –IN and + 0.5 V. For a common-mode voltage of 1.4 V, each ADA4937-1 output swings between 1.09 V and 1.71 V, providing a 1.25 V p-p differential output. A third-order, 125 MHz, low-pass filter between the ADA4937-1 and the and isolates the driver outputs from the ADC inputs ...
Page 25
... COMPLIANT TO JEDEC STANDARDS MO-220-VEED-2 EXCEPT FOR EXPOSED PAD DIMENSION. Figure 55. 16-Lead Lead Frame Chip Scale Package [LFCSP_VQ × Body, Very Thin Quad (CP-16-2) Dimensions shown in millimeters Package Description 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ 16-Lead LFCSP_VQ Rev Page ADA4937-1 0.50 0.40 0.30 PIN 1 INDICATOR * 1. 1.30 SQ 1.15 ...
Page 26
... ADA4937-1 NOTES Rev Page ...
Page 27
... NOTES Rev Page ADA4937-1 ...
Page 28
... ADA4937-1 NOTES ©2007 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D06591-0-5/07(0) Rev Page ...