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ADA4940-2 数据表(PDF) 1 Page - Analog Devices |
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ADA4940-2 数据表(HTML) 1 Page - Analog Devices |
1 / 32 page Ultralow Power, Low Distortion Fully Differential ADC Driver Data Sheet ADA4940-1/ADA4940-2 Rev. B Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityisassumedbyAnalogDevicesforitsuse,norforanyinfringementsofpatentsorother 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 www.analog.com Fax: 781.461.3113 ©2011 –2012 Analog Devices, Inc. All rights reserved. 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 sigma-delta (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 1 –FB 2 +IN 3 –IN 4 +FB 11 –OUT 12 DISABLE 10 +OUT 9 VOCM ADA4940-1 ADA4940-2 1 –IN1 2 +FB1 3 +VS1 4 +VS1 5 –FB2 6 +IN2 15 –VS2 16 –VS2 17 VOCM1 18 +OUT1 14 DISABLE2 13 –OUT2 Figure 1. 0 –160 –140 –120 –100 –80 –60 –40 –20 0 20k 40k 60k 80k 100k FREQUENCY (Hz) +DIN –DIN R1 R2 R4 R3 +IN –OUT CF 33Ω 2.5V AD7982 ADA4940-1 33Ω 2.7nF 2.7nF CF +OUT + – –IN IN+ IN– GND VDD REF VOCM Figure 2. ADA4940-1 Driving the AD7982 ADC The ADA4940-1 is available in a Pb-free, 3 mm × 3 mm, 16-lead LFCSP, and an 8-lead SOIC. The ADA4940-2 is available in a Pb- free, 4 mm × 4 mm, 24-lead LFCSP. The pinout is 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 the ADA4940-1/ADA4940-2 Product Isupply (mA) Bandwidth (MHz) Slew Rate (V/µs) Noise (nV/√Hz) AD8137 3 110 450 8.25 ADA4932-x 9 560 2800 3.6 ADA4941-1 2.2 31 22 5.1 Table 2. Complementary Products to the 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 |
类似零件编号 - ADA4940-2 |
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类似说明 - ADA4940-2 |
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