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ADA4806-1ARJZ-R7 Datasheet(PDF) 1 Page - Analog Devices |
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ADA4806-1ARJZ-R7 Datasheet(HTML) 1 Page - Analog Devices |
1 / 25 page 0.2 µV/°C Offset Drift, 105 MHz, Low Power, Multimode, Rail-to-Rail Amplifier Data Sheet ADA4806-1 FEATURES Ultralow supply current Full power mode: 500 µA Sleep mode: 74 µA Shutdown mode: 2.9 µA Dynamic power scaling Turn-on time from shutdown mode: 1.5 µs Turn-on time from sleep mode: 0.45 µs High speed performance with dc precision Input offset voltage: 125 µV maximum Input offset voltage drift: 1.5 µV/°C maximum −3 dB bandwidth: 105 MHz Slew rate: 160 V/ µs Low noise and distortion 5.9 nV/√Hz input voltage noise with 8 Hz 1/f corner −102 dBc/−126 dBc HD2/HD3 at 100 kHz Wide supply range: 2.7 V to 10 V Small package: 8-lead SOT-23 APPLICATIONS Portable and battery-powered instruments and systems High channel density data acquisition systems Precision analog-to-digital converter (ADC) drivers Voltage reference buffers Portable point of sales terminals Active RFID readers GENERAL DESCRIPTION The ADA4806-1 is a high speed, voltage feedback, rail-to-rail output, single operational amplifier with three power modes: full power mode, sleep mode, and shutdown mode. In full power mode, this amplifier provides a wide bandwidth of 105 MHz at a gain of +1, a fast slew rate 160 V/μs, and excellent dc precision with a low input offset voltage of 125 μV (maximum) and an input offset voltage drift of 1.5 μV/°C (maximum), while con-suming only 500 μA of quiescent current. Despite being a low power amplifier, the ADA4806-1 provides excellent overall performance, making it ideal for low power, high resolution data conversion systems. For data conversion applications where minimizing power dissipation is paramount, the ADA4806-1 offers a method to reduce power by dynamically scaling the quiescent power of the ADC driver with the sampling rate of the system by switching the amplifier to a lower power mode between samples. TYPICAL APPLICATIONS CIRCUIT 5V 2.5V REF C2 10µF C1 2.7nF IN+ REF GND VDD VDD IN– C3 0.1µF C4 100nF ADA4806-1 5V 0V TO VREF ADA4806-1 AD7980 R3 20Ω Figure 1. Driving the AD7980 with the ADA4806-1 Sleep mode reduces the amplifier quiescent current to 74 µA and provides a fast turn-on time of only 0.45 µs, enabling the use of dynamic power scaling for sample rates approaching 2 MSPS. For additional power savings at lower samples rates, the shutdown mode further reduces the quiescent current to only 2.9 µA. The ADA4806-1 operates over a wide range of supply voltages and is fully specified at supplies of 3 V, 5 V and ±5 V. This amplifier is available in a compact, 8-lead SOT-23 package and is rated to operate over the industrial temperature range of −40°C to +125°C. ADC SAMPLE RATE (ksps) 3.5 3.0 2.5 2.0 1.5 1.0 0.5 0 1 10 100 1000 SLEEP MODE SHUTDOWN MODE Figure 2. Quiescent Power Dissipation vs. ADC Sample Rate, Using Dynamic Power Scaling for the Two Low Power Modes Table 1. Complementary ADCs to the ADA4806-1 Product ADC Power (mW) Throughput (MSPS) Resolution (Bits) SNR (dB) AD7980 4.0 1 16 90.51 AD7982 7.0 1 18 98 AD7984 10.5 1.33 18 98.5 1 This SNR value is for the A Grade version of the AD7980. Rev. 0 Document Feedback 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 ©2015 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com |
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