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AD8338 Arkusz danych(PDF) 1 Page - Analog Devices |
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AD8338 Arkusz danych(HTML) 1 Page - Analog Devices |
1 / 16 page Low Power, 18 MHz Variable Gain Amplifier Data Sheet AD8338 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 ©2013 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 Adjustable gain range Low noise: 4.5 nV/√Hz Fully differential signal path Offset correction (offset null) feature Adjustable bandwidth 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 RF baseband signal conditioning 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 frequencies from LF to 18 MHz. The device can also operate using single-ended sources if required. The basic gain function is linear-in-dB with a nominal gain range of 0 dB to 80 dB; the nominal gain range corresponds to a control voltage on the GAIN pin of 0.1 V to 1.1 V. The gain range can be adjusted up or down via direct access to the internal summing nodes at the INPD and INMD pins. For example, if a 47 Ω resistor is applied to the INPD and INMD pins, a gain range of 20 dB to 100 dB is set with an input referred noise level of 1.5 nV√Hz. The AD8338 includes additional circuits to enable offset correction and automatic gain control (AGC). DC offset voltages are removed by the offset correction circuit, which behaves like a high-pass filter. The high-pass filter corner frequency is set using an external capacitor. The AGC function varies the gain of the AD8338 to maintain a constant rms output voltage. A user supplied voltage controls the target output rms voltage. A user supplied capacitor to ground at the DETO pin controls the response time of the AGC circuit. 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. 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 allowing user access to the internal summing nodes. With a few discrete components, users can customize the gain, bandwidth, input impedance, and noise profile of the part 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. The AD8338 is available in a 3 mm × 3 mm, RoHS compliant, 16-lead LFCSP. It is specified over the industrial temperature range of −40°C to +85°C. |
Podobny numer części - AD8338 |
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Podobny opis - AD8338 |
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