AD9237 Analog Devices, AD9237 Datasheet
AD9237
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AD9237 Summary of contents
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... MSPS, 135 MSPS, and MSPS. 2. Power scaling reduces the operating power further when running at lower speeds. 3. The AD9237 operates from a single 3 V power supply and features a separate digital output driver supply to accommodate 2.5 V and 3.3 V logic families. 4. The patented SHA input maintains excellent performance for input frequencies beyond Nyquist and can be configured for single-ended or differential operation ...
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... Initial Version Pin Configuration and Function Descriptions ..............................8 Terminology .......................................................................................9 Equivalent Circuits ......................................................................... 10 Typical Performance Characteristics ........................................... 11 Applying the AD9237 .................................................................... 16 Theory of Operation .................................................................. 16 Analog Input and Reference Overview ................................... 16 Voltage Reference ....................................................................... 18 Clock Input Considerations ...................................................... 19 Power Dissipation, Power Scaling, and Standby Mode ......... 19 ...
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... Rev Page AD9237 to T MIN AD9237BCP-65 Max Min Typ Max 12 12 ±1.95 ±1.30 ±1.95 ±2.10 ±1.05 ±2.25 ±0.95 −1.00 ±0.70 +1.25 ±1.35 ±0.90 ±2.00 ±2 ±12 ±25 ±5 ±25 0.8 ±2.5 0.1 7 1.35 LSB rms ...
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... V internal reference AD9237BCP-20 AD9237BCP-40 Min Typ Max Min Typ 66.8 66.5 65.6 66.6 65.3 66.6 66.0 66.3 66.7 66.4 65.1 66.5 64.4 66.4 65.6 65.8 10.8 10.7 Rev Page AD9237BCP-65 Max Min Typ Max Unit 2.0 V 0.8 0.8 V +10 –10 +10 μA +10 –10 +10 μ 3.29 V 3.25 V 0.2 0.2 V 0.05 0.05 V 2.49 V 2.45 V 0.2 0.2 V 0.05 0. MIN MAX AD9237BCP-65 Max ...
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... Min Typ Max Min Typ 50.0 25.0 15.0 8.8 15.0 8.8 3.5 3 1.0 1.0 0.5 0.5 3.0 3.0 3.0 3 Rev Page AD9237 AD9237BCP-65 Typ Max Min Typ Max 83.5 85.5 82.4 69.4 80.1 77.9 74.9 −83.5 −85.5 −82.4 −69.4 −80.1 −77.9 −74.9 −90 −90 −90 −72.0 −90 −90 −90 AD9237BCP-65 Max Min Typ Max Unit 65 MSPS ...
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... AD9237 TIMING DIAGRAM N–1 ANALOG INPUT CLK DATA N–11 OUT N+1 N N+2 N N+4 N+5 N–10 N–9 N–8 N–7 N–6 N–5 Figure 2. Timing Diagram Rev Page N+8 N+7 N+6 N–4 N–3 N–2 N– ...
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... Functional operability is not necessarily implied. Exposure to absolute maximum rating conditions for AVDD + 0 extended period may affect device reliability. AVDD + 0.3 V ESD CAUTION AVDD + 0.3 V AVDD + 0.3 V AVDD + 0.3 V +85 °C 150 °C 300 °C +150 °C = 32.5°C/W, θ = 32.71°C/ Rev Page AD9237 ...
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... AGND 29 VIN+ 30 VIN− EP MODE2 1 24 VREF PIN 1 CLK 2 23 SENSE INDICATOR MODE PDWN 4 AD9237 21 OTR D11 (MSB) TOP VIEW DNC 6 19 D10 (Not to Scale) D0 (LSB NOTES 1. DNC = DO NOT CONNECT RECOMMENDED THAT THE EXPOSED PADDLE BE SOLDERED TO THE GROUND PLANE ...
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... AC specifications may be reported in dBc (degrades as signal levels are lowered dBFS (always related back to converter full scale). Rev Page AD9237 ...
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... AD9237 EQUIVALENT CIRCUITS AVDD VIN+, VIN– Figure 4. Equivalent Analog Input Circuit MODE, 375Ω MODE2, GC, OE 70kΩ Figure 5. Equivalent MODE, MODE2, GC, OE Input Circuit DRVDD Figure 6. Equivalent Digital Output Circuit 375Ω CLK, PDWN Figure 7. Equivalent CLK, PDWN Input Circuit Rev Page D11– ...
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... Figure 11. AD9237-20 SNR/SFDR vs. Clock Frequency with Figure 12. AD9237-40 SNR/SFDR vs. Clock Frequency with f SNR = 66.0dBc SFDR = 78.6dBc 32.5 Figure 13. AD9237-65 SNR/SFDR vs. Clock Frequency with f Rev Page –0.5 dBFS SFDR SNR 65 60 10.0 12.5 15.0 17.5 CLOCK FREQUENCY (MSPS) ...
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... INPUT AMPLITUDE (dBFS) Figure 16. AD9237-40 SNR/SFDR vs. Input Amplitude with 32.5 –10 – MHz Figure 18. AD9237-65 SNR/SFDR vs. Input Amplitude with f IN SFDR dBc 1V p-p –10 – MHz Figure 19. AD9237-20 SNR/SFDR vs. Input Amplitude with f IN Rev Page ...
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... Figure 23. AD9237-65 Two-Tone SNR/SFDR , vs. Analog Input with IN2 100 90 SFDR dBFS 80 SNR dBFS 70 60 SFDR dBc 50 40 SNR dBc –30 Figure 24. AD9237-40 Two-Tone SNR/SFDR , vs. Analog Input with 100 90 SFDR dBFS 80 SNR dBFS 70 60 SFDR dBc 50 40 SNR dBc – MHz Figure 25 ...
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... Rev Page 100 90 SFDR dBFS 80 SNR dBFS 70 60 SFDR dBc 50 40 SNR dBc 30 –30 –25 –20 –15 INPUT AMPLITUDE (AIN) Figure 29. AD9237-40 Two-Tone SNR/SFDR vs. Analog Input with MHz MHz IN1 IN2 90 85 SFDR SNR ...
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... AD9237-20 AD9237-40 66.5 AD9237-65 66.0 65.5 65 CLOCK FREQUENCY (MSPS) Figure 32. AD9237 SINAD/ENOB vs. Clock Frequency with 10.83 80 10.75 75 10.67 70 10.59 65 10.50 60 – Nyquist Figure 33. AD9237-65 SNR/SFDR vs. Temperature with f IN Rev Page AD9237 SNR SFDR – TEMPERATURE (°C) = 32.5MHz IN 85 ...
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... SHA to acquire the wrong input value and should be minimized. ANALOG INPUT AND REFERENCE OVERVIEW The analog input to the AD9237 is a differential switched capacitor SHA that has been designed for optimum performance while processing a differential input signal. The SHA input can support a wide common-mode range and maintain excellent performance, as shown in Figure 34 ...
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... For example p-p signal can be applied to VIN+ while reference is applied to VIN–. The AD9237 then accepts an input signal varying between 2 V and the single-ended configuration, distortion performance may degrade significantly as compared to the differential case. ...
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... AGND to 0.2 V VOLTAGE REFERENCE A stable and accurate 0.5 V voltage reference is built into the AD9237. The input range can be adjusted by varying the reference voltage applied to the AD9237, using either the internal reference or an externally applied reference voltage. The input span of the ADC tracks reference voltage changes linearly ...
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... The lowest typical conversion rate of the AD9237 is 1 MSPS. At clock rates below 1 MSPS, dynamic performance may degrade. POWER DISSIPATION, POWER SCALING, AND 0.5V ERROR (%) ...
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... PDWN Voltage AVDD 1/3 AVDD AGND (Default) By asserting the PDWN pin high, the AD9237 is placed in power-down mode. In this state, the ADC typically dissipates 1 mW. During power-down, the output drivers are placed in a high impedance state. Low power dissipation in power-down mode is achieved by shutting down the reference, reference buffer, biasing networks, clock, and duty cycle stabilizer circuitry ...
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... By asserting the PDWN pin to AVDD/3, the AD9237 is placed in standby mode. In this state, the ADC typically dissipates 20 mW. The output drivers are placed in a high impedance state. The reference circuitry is enabled, allowing for a quick start upon bringing the ADC into normal operating mode. ...
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... ORDERING GUIDE 1, Model Temperature Range AD9237BCPZ-20 –40°C to +85°C AD9237BCPZRL7-20 –40°C to +85°C AD9237BCPZ-40 –40°C to +85°C AD9237BCPZRL7-40 –40°C to +85°C AD9237BCPZ-65 –40°C to +85°C AD9237BCPZRL7-65 –40°C to +85° RoHS-Compliant Part. 5.00 BSC SQ 0.60 MAX 24 0.50 BSC TOP 4 ...
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... NOTES Rev Page AD9237 ...
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... AD9237 NOTES © 2005–2010 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. D05455–0–5/10(A) Rev Page ...