ADA4927-1 AD [Analog Devices], ADA4927-1 Datasheet
ADA4927-1
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ADA4927-1 Summary of contents
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... The low dc offset and excellent dynamic performance of the ADA4927 make it well suited for a wide variety of data acquisition and signal processing applications. The ADA4927-1 is available in a Pb-free × 16-lead LFCSP, and the ADA4927-2 is available in a Pb-free × 24-lead LFCSP. The pinouts are optimized to facilitate printed circuit board (PCB) layout and to minimize distortion. They are specified to operate over the − ...
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... ADA4927-1/ADA4927-2 TABLE OF CONTENTS Features .............................................................................................. 1 Applications ....................................................................................... 1 General Description ......................................................................... 1 Functional Block Diagrams ............................................................. 1 Revision History ............................................................................... 2 Specifications ..................................................................................... 3 ±5 V Operation ............................................................................. Operation ............................................................................. 5 Absolute Maximum Ratings ............................................................ 7 Thermal Resistance ...................................................................... 7 Maximum Power Dissipation ..................................................... 7 ESD Caution .................................................................................. 7 Pin Configurations and Function Descriptions ........................... 8 Typical Performance Characteristics ............................................. 9 Test Circuits ..................................................................................... 15 Theory of Operation ...................................................................... 16 REVISION HISTORY 10/08— ...
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... 301 Ω 301 Ω 56.2 Ω (when used Conditions V = 0.1 V p-p OUT 2.0 V p-p OUT 0.1 V p-p, ADA4927-1 OUT 0.1 V p-p, ADA4927-2 OUT step, 25% to 75% OUT step OUT 0.9 V step See Figure 45 for distortion test circuit ...
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... ADA4927-1/ADA4927 Performance OCM OUT, cm Table 2. Parameter V DYNAMIC PERFORMANCE OCM Small Signal −3 dB Bandwidth Slew Rate Input Voltage Noise (RTI) V INPUT CHARACTERISTICS OCM Input Voltage Range Input Resistance Input Offset Voltage V CMRR OCM Gain General Performance Table 3. Parameter POWER SUPPLY ...
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... Output Balance Error = 301 Ω 301 Ω 56.2 Ω (when used Conditions V = 0.1 V p-p OUT 2.0 V p-p OUT 0.1 V p-p, ADA4927-1 OUT 0.1 V p-p, ADA4927-2 OUT step, 25% to 75% OUT step OUT 0.15 V step See Figure 45 for distortion test circuit ...
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... ADA4927-1/ADA4927 Performance OCM OUT, cm Table 5. Parameter V DYNAMIC PERFORMANCE OCM Small signal −3 dB Bandwidth Slew Rate Input Voltage Noise (RTI) V INPUT CHARACTERISTICS OCM Input Voltage Range Input Resistance Input Offset Voltage V CMRR OCM Gain General Performance Table 6. Parameter POWER SUPPLY ...
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... Unit JA 2.5 87 °C/W 2.0 47 °C/W 1.5 1.0 0 –40 ESD CAUTION Rev Page ADA4927-1/ADA4927 the sum of the D ) times the quiescent current ( ADA4927-2 ADA4927-1 – 100 AMBIENT TEMPERATURE (°C) Figure 4. Maximum Power Dissipation vs. Ambient Temperature for a 4-Layer Board ). ...
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... Scale) + OCM NOTES 1. CONNECT THE EXPOSED PADDLE TO ANY PLANE BETWEEN AND INCLUDING +V AND –V S Figure 5. ADA4927-1 Pin Configuration Table 9. ADA4927-1 Pin Function Descriptions Pin No. Mnemonic Description 1 −FB Negative Output for Feedback Component Connection 2 +IN Positive Input Summing Node 3 − ...
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... R = 301 Ω 56.2 Ω (when used 10k 1k 10k 1k 10k Figure 12. Large Signal Frequency Response for Various Temperatures Rev Page ADA4927-1/ADA4927 kΩ, unless otherwise noted p-p OUT dm 0 –3 – 301Ω – 10 442Ω ...
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... ADA4927-1/ADA4927 100mV p-p OUT dm 0 –3 – 200Ω L – 1kΩ L – 100 FREQUENCY (MHz) Figure 13. Small Signal Frequency Response for Various Loads 100mV p-p OUT dm 0 –3 – –4V OCM V = –3.5V OCM –9 OCM V = +3.5V OCM V = +4V OCM – ...
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... HD2, 10MHz –110 HD3, 10MHz –120 –4 0.6 0.8 1.0 1.2 Figure 24. Harmonic Distortion vs. V Rev Page ADA4927-1/ADA4927 p-p OUT dm HD2 HD3 HD2 HD3 HD2 HD3 100 FREQUENCY (MHz p-p ...
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... ADA4927-1/ADA4927-2 – ±2.5V S –50 –60 –70 –80 –90 –100 –110 –120 –130 1 10 FREQUENCY (MHz) Figure 25. Harmonic Distortion vs. Frequency at Various V – p-p OUT dm –50 –60 –70 –80 –90 –100 –110 –120 –130 1 10 FREQUENCY (MHz) Figure 26. Spurious-Free Dynamic Range vs. Frequency at Various Gains – ...
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... –5 –10 1k 0.1 Figure 35. Closed-Loop Output Impedance Magnitude vs. Frequency –5 – 10M 100M Rev Page ADA4927-1/ADA4927-2 MAGNITUDE PHASE 1k 10k 100k 1M 10M 100M 1G 10G FREQUENCY (Hz ± ± ±2.5V ...
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... ADA4927-1/ADA4927 –10 –20 –30 –40 –50 – TIME (ns) Figure 37. Small Signal Pulse Response –10 –20 –30 –40 –50 – TIME (ns) Figure 38. V Small Signal Pulse Response OCM 1.2 1.0 0.8 0.6 0.4 0.2 0 –0.2 – ...
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... FILTER 56.2Ω V ADA4927 OCM 0.1µF 301Ω 25.5Ω 0.1µF –5V 301Ω Figure 45. Test Circuit for Distortion Measurements Rev Page ADA4927-1/ADA4927-2 1kΩ DIFFERENTIAL NETWORK ANALYZER INPUT 50Ω DIFFERENTIAL NETWORK ANALYZER INPUT 50Ω 200Ω 50Ω 442Ω HP ...
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... ADA4927-1/ADA4927-2 THEORY OF OPERATION The ADA4927 differs from conventional operational amplifiers in that it has two outputs whose voltages move in opposite directions and an additional input Moreover, the ADA4927 OCM uses a current feedback architecture. Like a traditional current feedback op amp, the ADA4927 relies on high open-loop trans- impedance, T(s), and negative current feedback to force the outputs to the desired voltages ...
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... G1 1/2 (4kTR ) G2 1/2 (4kTR ) F1 1/2 (4kTR ) F2 Rev Page ADA4927-1/ADA4927 modeled as a differential input, and the nIN and i , appear between each input and nIN− nIN+ is obtained by multiplying nIN (defined in the G equation). The N N pin When the feedback OCM nCM is common mode. Each of the four ...
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... ADA4927-1/ADA4927-2 Table 12. Differential Input, DC-Coupled Nominal Gain (dB) R (Ω 301 20 442 26 604 Table 13. Single-Ended Ground-Referenced Input, DC-Coupled, R Nominal Gain (dB) R (Ω 309 301 20 511 39.2 26 806 || Similar to the case of a conventional op amp, the output noise voltage densities can be estimated by multiplying the input- referred terms at +IN and − ...
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... F source resistance R is equal to R ⎞ ⎟ 348 ⎟ = 464 Ω ⎟ 348 ⎟ × 348 348 ) ⎠ Rev Page ADA4927-1/ADA4927 348Ω 464Ω 50Ω 348Ω ADA4927 OCM R G 348Ω ...
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... ADA4927-1/ADA4927 ||R = 26.5 Ω. Note that p-p, which was obtained with R circuit with the Thevenin equivalent (closest 1% value used for the terminated source and R TH loop is shown in Figure 53 348Ω 26.7Ω 348Ω ...
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... Power-Down in Cold Applications The power-down feature should not be used in applications in which the ambient temperature falls below 0°C. Contact sales for information regarding applications that require the power- down feature to be used at ambient temperatures below 0°C. Rev Page ADA4927-1/ADA4927-2 ...
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... ADA4927-1 was addressed. The first requirement is a solid ground plane that covers as much of the board area around the ADA4927-1 as possible. However, clear the area near the feedback resistors (RF), gain resistors (RG), and the input summing nodes (Pin 2 and Pin 3) of all ground and power planes (see Figure 55) ...
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... V ADA4927 OCM 39.2Ω 24.3Ω 30nH 0.1µF 0.1µF 38.3Ω 511Ω Rev Page ADA4927-1/ADA4927-2 pin of the ADA4927 is bypassed for noise reduction OCM 5V (A) 3.3V (A) 3.3V (D) AVDD2 AVDD1 DRVDD VIN– AD9445 BUFFER T/H 47pF 14 ADC VIN+ CLOCK/ ...
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... SEATING PLANE ORDERING GUIDE Model Temperature Range 1 ADA4927-1YCPZ-R2 −40°C to +105°C 1 ADA4927-1YCPZ-RL −40°C to +105°C 1 ADA4927-1YCPZ-R7 −40°C to +105°C 1 ADA4927-2YCPZ-R2 −40°C to +105°C 1 ADA4927-2YCPZ-RL −40°C to +105°C 1 ADA4927-2YCPZ-R7 −40°C to +105° RoHS Compliant Part. ...