ada4922-1 Analog Devices, Inc., ada4922-1 Datasheet
ada4922-1
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ada4922-1 Summary of contents
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... XFCB process that enables the amplifier to achieve excellent noise and distortion performance on high supply voltages. The ADA4922-1 is available in an 8-lead 3 mm × LFCSP as well as an 8-lead SOIC package. Both packages are equipped with an exposed paddle for more efficient heat transfer. The ADA4922-1 is rated to work over the extended industrial temperature range, − ...
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... Pin Configuration and Function Descriptions............................. 6 Typical Performance Characteristics ............................................. 7 REVISION HISTORY 10/05—Revision 0: Initial Version Theory of Operation ...................................................................... 14 Applications..................................................................................... 16 ADA4922-1 Differential Output Noise Model .......................... 16 Using the REF Pin ...................................................................... 16 Internal Feedback Network Power Dissipation...................... 17 Disable Feature ........................................................................... 17 Driving a Differential Input ADC............................................ 17 Printed Circuit Board Layout Considerations ....................... 18 Outline Dimensions ...
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... p- kΩ, HD2/HD3 100 kHz f = 100 kHz Each single-ended output kΩ L 30% overshoot Disabled Enabled DIS = −9 V DIS = −11 V Rev Page ADA4922-1 Min Typ Max Unit 34 38 MHz 6.5 7.2 MHz 180/330 ns 260 V/μs 730 V/μs ...
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... ADA4922 ± 25° kΩ, DIS = HIGH Table 2. Parameter DYNAMIC PERFORMANCE –3 dB Bandwidth Overdrive Recovery Time Slew Rate Settling Time to 0.01% NOISE/DISTORTION PERFORMANCE Harmonic Distortion Differential Output Voltage Noise Input Current Noise DC PERFORMANCE Differential Output Offset Voltage Differential Output Offset Voltage Drift ...
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... Table 4. Thermal Resistance Package Type 8-Lead SOIC with EP on 4-layer board 8-Lead LFCSP with EP on 4-layer board Maximum Power Dissipation The maximum safe power dissipation in the ADA4922-1 package is limited by the associated rise in junction temperature ( the die. At approximately 150°C, which is the glass J transition temperature, the plastic changes its properties ...
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... PIN CONFIGURATION AND FUNCTION DESCRIPTIONS Table 5. Pin Function Descriptions Pin No. Mnemonic REF OUT+ 5 OUT− S− 7 DIS 8 IN ADA4922 REF DIS S– OUT+ OUT– CONNECT Figure 4. Pin Configuration Description ...
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... ± 12V S 100 1000 Figure 8. Large Signal Frequency Response for Various Power Supplies V = 0.2V p 100 1000 0.2V p-p O 100 1000 Rev Page ADA4922 ± 5V, V – –6 –9 –12 = ± 12V, V – 40V p –18 –21 – ...
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... ADA4922 –3 –6 –9 –12 –15 –18 –21 = ± 5V 10pF –24 = ± 5V 20pF ± 12V 0pF – ± 12V 20pF – FREQUENCY (MHz) Figure 11. Small Signal Frequency Response for Various Capacitive Loads ...
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... Figure 20. Harmonic Distortion for Various Loads 100 10 1 0.1 0.01 0.001 Figure 21. Single-Ended Output Impedance vs. Frequency and Supplies 10 100 Rev Page ADA4922-1 = ± 12V SECOND HARMONIC S = 40V p-p THIRD HARMONIC 600 Ω Ω Ω ...
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... ADA4922-1 100 100 1k 10k 100k FREQUENCY (Hz) Figure 22. Differential Output Noise vs. Frequency 0.12 = ± 0.10 = ±12V 0. 0.06 0.04 0.02 0 –0.02 –0.04 –0.06 –0.08 –0.10 –0.12 Figure 23. Small Signal Transient Response for Various Power Supplies 0.125 C = 0pF 10pF 0.100 ...
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... Figure 33. Differential Output Offset Voltage Distribution Rev Page ADA4922-1 V OUT ERROR 1μs/DIV = ±12V 40V p Figure 31. Settling Time ± INPUT × 2 OUTPUT Figure 32. Input Overdrive Recovery ± ...
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... ADA4922-1 12.0 11.5 11.0 10.5 10.0 = ±12V V 9.5 S 9.0 8.5 8.0 7.5 = ± 7.0 6.5 6.0 –40 – TEMPERATURE (°C) Figure 34. Power Supply Current vs. Temperature 3.0 2.5 2.0 1.5 = ±5V INPUT BIAS CURRENT REFERENCE BIAS CURRENT ±12V INPUT BIAS CURRENT REFERENCE BIAS CURRENT, V 1.0 –40 – TEMPERATURE (°C) Figure 35. Input Bias Current vs. Temperature ...
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... I DIS ±12V I –50 DIS –100 –150 DIS VOLTAGE WITH RESPECT TO V Figure 40. Disable Current vs. Disable Voltage 20 (V) S– Rev Page ADA4922-1 ...
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... ADA4922-1 THEORY OF OPERATION The ADA4922-1 is dual amplifier that has been optimized to drive a differential ADC from a single-ended input source with a minimum number of external components (see Figure 41 REF Figure 41. Functional Diagram The differential output voltage is defined − OUT+ OUT− ...
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... FREQUENCY (Hz) Figure 47. Amplifier Gain/Phase Relationship The architecture used in the ADA4922-1 results in excellent SNR and distortion performance when compared to other differential amplifiers. One of the more subtle points of operation arises when the two amplifiers are used to generate the differential outputs. Because ...
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... The ADA4922 fixed-gain, single-ended-to-differential voltage amplifier, optimized for driving high resolution ADCs in high voltage applications. There are no gain adjustments available to the user. ADA4922-1 DIFFERENTIAL OUTPUT NOISE MODEL The principal noise sources in a typical ADA4922-1 application circuit are shown in Figure 49 ...
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... For ac signals, rms analysis is required. DISABLE FEATURE The ADA4922-1 includes a disable feature that can be asserted to minimize power consumption in a device that is not needed at a particular time. When asserted, the disable feature does not (12) ...
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... ADA4922-1 PRINTED CIRCUIT BOARD LAYOUT CONSIDERATIONS Although the ADA4922-1 is used in many applications involving frequencies that are well below 1 MHz, some general high speed layout practices must be adhered to because high speed amplifier. Controlled impedance transmission lines are not required for low frequency signals, provided the signal rise times are longer than approximately 5 times the electrical delay of the interconnections. For reference, typical 50 Ω ...
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... VIEW 0.50 BSC 5 0.70 MAX 0.65 TYP 0.05 MAX 0.01 NOM 0.30 0.20 REF 0.23 0.18 Figure 52. 8-Lead Lead Frame Chip Scale Package [LFCSP_VD × Body, Very Thin, Dual Lead (CP-8-2) Dimensions shown in millimeters Rev Page ADA4922-1 2.29 (0.092) 2.29 (0.092) 0.50 (0.020) × 45 0.25 (0.010) 8° 1.27 (0.050) 0° 0.40 (0.016) 0.50 0.40 0.30 PIN 1 INDICATOR 1 1 ...
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... ADA4922-1ARDZ-R7 –40°C to +85°C 1 ADA4922-1ACPZ-R2 –40°C to +85°C 1 ADA4922-1ACPZ-RL –40°C to +85°C 1 ADA4922-1ACPZ-RL7 –40°C to +85° Pb-free part. © 2005 Analog Devices, Inc. All rights reserved. Trademarks and registered trademarks are the property of their respective owners. ...