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ADA4940-2ACPZ-RL Datasheet(PDF) 1 Page - Analog Devices |
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ADA4940-2ACPZ-RL Datasheet(HTML) 1 Page - Analog Devices |
1 / 30 page Ultralow Power, Low Distortion, Fully Differential ADC Drivers Data Sheet ADA4940-1/ADA4940-2 Rev. D Document Feedback Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringementsof patentsorother rightsofthirdpartiesthatmayresultfromitsuse.Specificationssubjecttochangewithoutnotice.No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. Trademarksandregisteredtrademarksarethepropertyoftheirrespectiveowners. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781.329.4700 ©2011–2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Small signal bandwidth: 260 MHz Ultralow power 1.25mA Extremely low harmonic distortion −122 dB THD at 50 kHz −96 dB THD at 1 MHz Low input voltage noise: 3.9 nV/√Hz 0.35 mV maximum offset voltage Balanced outputs Settling time to 0.1%: 34 ns Rail-to-rail output: −VS + 0.1 V to +VS − 0.1 V Adjustable output common-mode voltage Flexible power supplies: 3 V to 7 V (LFCSP) Disable pin to reduce power consumption ADA4940-1 is available in LFCSP and SOIC packages APPLICATIONS Low power PulSAR®/SAR ADC drivers Single-ended-to-differential conversion Differential buffers Line drivers Medical imaging Industrial process controls Portable electronics GENERAL DESCRIPTION The ADA4940-1/ADA4940-2 are low noise, low distortion fully differential amplifiers with very low power consumption. They are an ideal choice for driving low power, high resolution, high performance SAR and Σ-Δ analog-to-digital converters (ADCs) with resolutions up to 16 bits from dc to 1 MHz on only 1.25 mA of quiescent current. The adjustable level of the output common- mode voltage allows the ADA4940-1/ADA4940-2 to match the input common-mode voltage of multiple ADCs. The internal common-mode feedback loop provides exceptional output balance, as well as suppression of even-order harmonic distortion products. With the ADA4940-1/ADA4940-2, differential gain configurations are easily realized with a simple external feedback network of four resistors determining the closed-loop gain of the amplifier. The ADA4940-1/ADA4940-2 are fabricated using Analog Devices, Inc., SiGe complementary bipolar process, enabling them to achieve very low levels of distortion with an input voltage noise of only 3.9 nV/√Hz. The low dc offset and excellent dynamic performance of the ADA4940-1/ADA4940-2 make them well suited for a variety of data acquisition and signal processing applications. FUNCTIONAL BLOCK DIAGRAMS NOTES 1. CONNECT THE EXPOSED PAD TO –VS OR GROUND. DISABLE –FB +IN –IN +FB –OUT ADA4940-1 +OUT VOCM 12 11 10 1 3 4 9 2 Figure 1. ADA4940-1 –IN1 +FB1 +VS1 +VS1 –FB2 +IN2 DISABLE1 –VS2 –VS2 VOCM1 +OUT1 ADA4940-2 –OUT2 2 1 3 4 5 6 18 17 16 15 14 13 NOTES 1. CONNECT THE EXPOSED PAD TO –VS OR GROUND. Figure 2. ADA4940-2 The ADA4940-1 is available in a 3 mm × 3 mm, 16-lead LFCSP and an 8-lead SOIC. The ADA4940-2 is available in a 4 mm × 4 mm, 24-lead LFCSP. The pinouts are optimized to facilitate printed circuit board (PCB) layout and minimize distortion. The ADA4940-1/ADA4940-2 are specified to operate over the −40°C to +125°C temperature range. Table 1. Similar Products to ADA4940-1/ADA4940-2 Product ISUPPLY (mA) Bandwidth (MHz) Slew Rate (V/μs) Noise (nV/√Hz) AD8137 3 110 450 8.25 ADA4932-1 9 560 2800 3.6 ADA4941-1 2.2 31 22 5.1 Table 2. Complementary Products to ADA4940-1/ADA4940-2 Product Power (mW) Throughput (MSPS) Resolution (Bits) SNR (dB) AD7982 7.0 1 18 98 AD7984 10.5 1.333 18 96.5 AD7621 65 3 16 88 AD7623 45 1.333 16 88 |
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