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AD7944 Folha de dados(PDF) 1 Page - Analog Devices |
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AD7944 Folha de dados(HTML) 1 Page - Analog Devices |
1 / 28 page 1 nV/√Hz, Low Power, Rail-to-Rail Output Amplifiers Data Sheet ADA4896-2/ADA4897-1/ADA4897-2 Rev. B 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 www.analog.com Fax: 781.461.3113 ©2012 Analog Devices, Inc. All rights reserved. FEATURES Low wideband noise 1 nV/√Hz 2.8 pA/√Hz Low 1/f noise: 2.4 nV/√Hz at 10 Hz Low distortion: −115 dBc at 100 kHz, VOUT = 2 V p-p Low power: 3 mA per amplifier Low input offset voltage: 0.5 mV maximum High speed −3 dB bandwidth: 230 MHz (G = +1) Slew rate: 120 V/μs Settling time to 0.1%: 45 ns Rail-to-rail output Wide supply range: 3 V to 10 V Disable feature (ADA4897-1/ADA4897-2) APPLICATIONS Low noise preamplifier Ultrasound amplifiers PLL loop filters High performance ADC drivers DAC buffers GENERAL DESCRIPTION The ADA4896-2/ADA4897-1/ADA4897-2 are unity-gain stable, low noise, rail-to-rail output, high speed voltage feedback amplifiers that have a quiescent current of 3 mA. With a 1/f noise of 2.4 nV/√Hz at 10 Hz and a spurious-free dynamic range of −80 dBc at 2 MHz, the ADA4896-2/ADA4897-1/ADA4897-2 are ideal solutions in a variety of applications, including ultrasound, low noise preamplifiers, and drivers of high performance ADCs. The Analog Devices, Inc., proprietary next-generation SiGe bipolar process and innovative architecture enable such high performance amplifiers. The ADA4896-2/ADA4897-1/ADA4897-2 have 230 MHz bandwidth, 120 V/μs slew rate, and settle to 0.1% in 45 ns. With a wide supply voltage range of 3 V to 10 V, the ADA4896-2/ ADA4897-1/ADA4897-2 are ideal candidates for systems that require high dynamic range, precision, low power, and high speed. The ADA4896-2 is available in 8-lead LFCSP and 8-lead MSOP packages. The ADA4897-1 is available in 8-lead SOIC and 6-lead SOT-23 packages. The ADA4897-2 is available in a 10-lead MSOP package. The ADA4896-2/ADA4897-1/ADA4897-2 operate over the extended industrial temperature range of −40°C to +125°C. FUNCTIONAL BLOCK DIAGRAM NC 1 –IN 2 +IN 3 –VS 4 8 +VS 7 OUT 6 NC 5 DISABLE Figure 1. 8-Lead SOIC (ADA4897-1) 0 1 2 3 4 5 6 7 8 FREQUENCY (Hz) 1 10 100 1k 10k 100k 1M 5M VS = ±5V Figure 2. Voltage Noise vs. Frequency Table 1. Other Low Noise Amplifiers VN (nV/√Hz) Supply Part No. At 1 kHz At 100 kHz BW (MHz) Voltage (V) AD797 0.9 0.9 8 10 to 30 AD8021 5 2.1 490 5 to 24 AD8099 3 0.95 510 5 to 12 AD8045 6 3 1000 3.3 to 12 ADA4899-1 1.4 1 600 5 to 12 ADA4898-1/ ADA4898-2 0.9 0.9 65 10 to 32 Table 2. Complementary ADCs Part No. Bits Speed (MSPS) Power (mW) AD7944 14 2.5 15.5 AD7985 16 2.5 15.5 AD7986 18 2 15 |
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