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AD8338 데이터시트(PDF) 1 Page - Analog Devices |
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AD8338 데이터시트(HTML) 1 Page - Analog Devices |
1 / 19 page Low Power, 18 MHz Variable Gain Amplifier Data Sheet AD8338 Rev. B 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 ©2013–2016 Analog Devices, Inc. All rights reserved. Technical Support www.analog.com FEATURES Voltage controlled gain range of 0 dB to 80 dB 3 mA supply current at gain of 40 dB Low frequency (LF) to 18 MHz operation Supply range: 3.0 V to 5.0 V Low noise: 4.5 nV/√Hz at 80 dB gain Fully differential signal path Offset correction (offset null) feature Internal 1.5 V reference 16-lead LFCSP Automatic gain control feature Wide gain range for high dynamic range signals APPLICATIONS Front end for inductive telemetry systems Ultrasonic signal receivers Signal compression for driving an ADC AGC amplifiers FUNCTIONAL BLOCK DIAGRAM INPR INPD INMD INMR MODE COMM GAIN FBKM OUTP OUTM DETO VAGC FBKP + – + – VREF VGA CORE 0dB TO 80dB OFFSET NULL OUTPUT STAGE 0dB OFSN VREF VBAT AUTOMATIC GAIN CONTROL GAIN INTERFACE AD8338 Figure 1. GENERAL DESCRIPTION The AD8338 is a variable gain amplifier (VGA) for applications that require a fully differential signal path, low power, low noise, and a well-defined gain over frequency. Although the inputs are differential, the device can also be driven with a single-ended source if required. The basic gain function is linear-in-dB and is controlled by the voltage applied to Pin GAIN. The nominal gain range spans from 0 dB to 80 dB for control voltages between 0.1 V to 1.1 V with a slope of 12.5 mV/dB. The nominal gain range can be shifted up or down via direct access to Pin INPD and Pin INMD, the current inputs of the VGA. For example, driving the INPD and INMD pins with 50 Ω resistors shifts the gain range up by 20 dB, that is, 20 dB to 100 dB, and lowers the input referred noise of the device to 1.5 nV/√Hz. Additionally, the gain slope can be inverted via logic Pin MODE. The AD8338 includes additional circuit blocks to enable input offset correction and automatic gain control (AGC). DC offset voltages are removed by the offset correction circuit, which behaves like a high-pass filter whose corner is set with an external capacitor. The AGC function varies the gain of the AD8338 to maintain a constant rms output voltage. An externally applied voltage to Pin VAGC with respect to the voltage at Pin VREF sets the output rms amplitude. A capacitor from Pin DETO to ground sets the response time of the AGC circuit. 100 –40 –20 0 20 40 60 80 10k 100M 10M 1M 100k FREQUENCY (Hz) VGAIN = 0.1V VGAIN = 0.2V VGAIN = 0.3V VGAIN = 0.4V VGAIN = 0.5V VGAIN = 0.6V VGAIN = 0.7V VGAIN = 0.8V VGAIN = 0.9V VGAIN = 1.0V VGAIN = 1.1V Figure 2. Gain vs. Frequency The AD8338 offers additional versatility by providing access to the internal summing nodes of the VGA core and the output amplifiers. With the addition of a few external passive components, users can customize the gain, bandwidth, input impedance, and noise profile of the device to fit their application. The AD8338 uses a single-supply voltage of 3.0 V to 5.0 V and is very power efficient, consuming as little as 3 mA quiescent current at mid gain. The AD8338 is available in a 3 mm × 3 mm, RoHS-compliant, 16-lead LFCSP and is specified over the industrial temperature range of −40°C to +85°C. |
유사한 부품 번호 - AD8338_16 |
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유사한 설명 - AD8338_16 |
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