AD8139 AD [Analog Devices], AD8139 Datasheet
AD8139
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AD8139 Summary of contents
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... With its low noise, high SFDR, and wide bandwidth ideal choice for driving ADCs with resolutions to 18 bits. The AD8139 is easy to apply, and its in- ternal common-mode feedback architecture allows its output common-mode voltage to be controlled by the voltage applied to one pin ...
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... AD8139 TABLE OF CONTENTS V = ± Specifications.............................................. 3 S OCM 2.5 V Specifications ............................................. 5 S OCM Absolute Maximum Ratings............................................................ 7 Thermal Resistance ...................................................................... 7 ESD Caution.................................................................................. 7 Pin Configuration and Function Descriptions............................. 8 Typical Performance Characteristics ............................................. 9 Theory of Operation ...................................................................... 18 REVISION HISTORY 8/04—Data Sheet Changed from a Rev Rev. A. Added 8-Lead LFCSP.........................................................Universal Changes to General Description ...
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... S − 100 −69 515 250 0.999 1.000 1.001 −3.8 +3.8 3 −900 ±300 +900 3.5 1.3 4 AD8139 Unit MHz MHz MHz V/µ dBc nV/√Hz pA/√Hz µV µV/ºC µA µ kΩ MΩ – 0. – 0.15 ...
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... AD8139 Parameter POWER SUPPLY Operating Range Quiescent Current +PSRR −PSRR OPERATING TEMPERATURE RANGE Conditions Change ±1V S Change in −V = ±1V S Rev Page Min Typ Max Unit 4.5 ±6 V 24.5 25 112 dB 95 109 dB −40 +125 °C ...
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... S − −70 440 150 0.999 1.000 1.001 1.0 3.8 3.5 = 2.5 V −1.0 ±0.45 +1.0 3.5 1.3 4 AD8139 Unit MHz MHz MHz V/μ dBc nV/√Hz pA/√Hz µV µV/ºC μA µ KΩ MΩ − 0. − 0. MHz V/μ ...
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... AD8139 Parameter POWER SUPPLY Operating Range Quiescent Current +PSRR −PSRR OPERATING TEMPERATURE RANGE Conditions Change ± Change in −V = ± Rev Page Min Typ Max Unit +4.5 ±6 V 21.5 22 105 dB −40 +125 °C ...
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... Package Type SOIC-8 with EP/4-Layer LFCSP/4-Layer Maximum Power Dissipation The maximum safe power dissipation in the AD8139 package is limited by the associated rise in junction temperature (T die. At approximately 150°C, which is the glass transition tem- perature, the plastic will change its properties. Even temporarily ...
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... AD8139 TEST OCM 60.4Ω 200Ω G 50Ω Figure 5. Basic Test Circuit R = 200Ω F 50Ω 200Ω G 60.4Ω V AD8139 OCM 60.4Ω 200Ω G 50Ω 200Ω F Figure 6. Capacitive Load Test Circuit Rev Page – 1kΩ ...
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... V = 2.0V p –12 10 100 FREQUENCY (MHz) 3 +125°C +85° –1 –2 –3 –4 –5 –6 –7 –8 –9 –40°C –10 – 2.0V p –12 10 100 FREQUENCY (MHz) AD8139 1000 ± 1000 +25°C 1000 ...
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... AD8139 200Ω –1 –2 –3 –4 –5 –6 –7 –8 –9 –10 – 0.1V p –12 10 100 FREQUENCY (MHz) Figure 13. Small Signal Frequency Response for Various Loads –1 –2 – 2pF F –4 –5 –6 –7 –8 – ...
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... FREQUENCY (MHz) Figure 23. Third Harmonic Distortion vs. Frequency and Gain – 2.0V p –40 – 100Ω L – 200Ω L –70 –80 – 500Ω 1kΩ FREQUENCY (MHz) Figure 24. Third Harmonic Distortion vs. Frequency and Load AD8139 = +5V ± 100 100 100 ...
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... AD8139 – 2.0V p –40 –50 –60 – 200Ω F – 500Ω F –90 –100 –110 R = 1kΩ F –120 –130 0.1 1 FREQUENCY (MHz) Figure 25. Second Harmonic Distortion vs. Frequency and R – 2MHz – +5V S –100 –110 –120 –130 –140 –150 p- Figure 26 ...
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... Figure 34. Large Signal Transient Response For C F 1.5 1.0 0.5 0 –0.5 –1.0 5ns/DIV –1.5 Figure 35. Large Signal Transient Response for Capacitive Loads 1.5 1.0 0.5 0 –0.5 –1.0 –1.5 Rev Page AD8139 = 0pF 4V p 2pF 0pF 2pF F 5ns/DIV TIME (ns 63.4 Ω 15pF 31.6 Ω ...
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... AD8139 1.5 ± 5V 1.0 +5V 0.5 0 –0 p IN, dm –1.0 –1.5 TIME (ns) Figure 37. V Large Signal Transient Response OCM 0.2V p-p IN, cm ∆ ∆ INPUT CMRR = IN, cm –10 –20 –30 –40 = 10k Ω –50 –60 = 200 Ω –70 – ...
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... O, dm ∆ ∆ 100 FREQUENCY (MHz) Figure 47. Output Balance vs. Frequency ± 200Ω 1kΩ V – – S– – 100 TEMPERATURE (°C) AD8139 50ns/DIV 500 –50 –100 –150 –200 –250 –300 120 ...
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... AD8139 3 2.5 I BIAS 2.0 1.5 1.0 –40 – TEMPERATURE (°C) Figure 49. Input Bias and Offset Current vs. Temperature ± –2 –4 –6 –8 –10 –5 –4 –3 –2 – (V) ACM Figure 50. Input Bias Current vs. Input Common-Mode Voltage ...
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... TEMPERATURE (°C) Figure 55. V Bias Current vs. Temperature OCM –2 –4 –6 100 120 –5 –4 Figure 56. V Rev Page AD8139 ± +5V S –3 –2 – (V) OCM Bias Current vs. V Input Voltage ...
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... Output The block diagram of the AD8139 in Figure 58 shows the external differential feedback loop (R differential input transconductance amplifier, G OCM internal common-mode feedback loop (voltage divider across ...
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... The differential output voltage noise contains contributions from the AD8139’s input voltage noise and input current noise as well as those from the external feedback networks. The contribution from the input voltage noise spectral density is computed as ⎛ ⎞ R ...
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... OCM IN– AD8139 1 – IN+ 324Ω 15Ω DGND AGND REFGND REF REFBUFIN PDBUF 2.7nF +1.7V V ACM +0.95V = 0 +0.2V Figure 59. AD8139 Driving AD7674, 18-Bit, 800 kSPS A/D Converter Rev Page the input impedance becomes − but it is higher in Equation 19 ...
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... AD8031 – Figure 60. Low-Z 2.5 V Buffer Another way to avoid the input common-mode swing limita- tion is to use dual power supplies on the AD8139. In this case, the biasing circuitry is not required. Bandwidth Versus Closed-Loop Gain The AD8139’ bandwidth decreases proportionally to increasing closed-loop gain in the same way as a traditional voltage feedback operational amplifier ...
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... Layout Considerations Standard high speed PCB layout practices should be adhered to when designing with the AD8139. A solid ground plane is recom- mended and good wideband power supply decoupling networks should be placed as close as possible to the supply pins. ...
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... V p-p swinging about a baseline of 1.25 V, and the minimum negative excursion is approximately 1 V. 50Ω SIGNAL SOURCE Figure 62. AD8139 Driving AD6645, 14-Bit, 80 MSPS/105 MSPS A/D Converter Exposed Paddle (EP) The SOIC-8 and LFCSP packages have an exposed paddle on the underside of its body. In order to achieve the specified = 2.4 V, and V is ICM ...
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... AD8139ARDZ-REEL –40°C to +125°C 1 AD8139ARDZ-REEL7 –40°C to +125°C AD8139ACP-R2 –40°C to +125°C AD8139ACP-REEL –40°C to +125°C AD8139ACP-REEL7 –40°C to +125°C 1 AD8139ACPZ-R2 –40°C to +125°C AD8139ACPZ-REEL 1 –40°C to +125°C 1 AD8139ACPZ-REEL7 –40°C to +125° Pb-free part ...