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AD8436JCPZ-RL Datasheet(PDF) 1 Page - Analog Devices |
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AD8436JCPZ-RL Datasheet(HTML) 1 Page - Analog Devices |
1 / 20 page Low Cost, Low Power, True RMS-to-DC Converter AD8436 Rev. 0 Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibilityis assumedbyAnalogDevicesforitsuse,norforanyinfringements of patents or other 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 Analog Devices, Inc. All rights reserved. FEATURES Computes true rms value instantly Accuracy: ±10 μV ± 0.5% of reading Wide dynamic input range 100 μV rms to 3 V rms (8.5 V p-p) full-scale input range Larger inputs with external scaling Wide bandwidth: 1 MHz for −3 dB (300 mV) 65 kHz for additional 1% error Zero converter dc output offset No residual switching products Specified at 300 mV rms input Accurate conversion with crest factors up to 10 Low power: 300 µA typical at ±2.4 V Fast settling at all input levels High-Z FET separately powered input buffer RIN ≥ 1012 Ω, CIN ≤ 2 pF Precision dc output buffer Wide supply range Dual: ±2.4 V to ±18 V Single: 4.8 V to 36 V Small size: 4 mm × 4 mm package ESD protected FUNCTIONAL BLOCK DIAGRAM VEE CAVG VCC IGND OUT IBUFGN RMS IBUFOUT IBUFIN+ SUM 8kΩ 100kΩ 16kΩ 100kΩ OGND 10kΩ 10kΩ FET OP AMP 10pF IBUFIN– OBUFOUT OBUFIN+ OBUFIN– 16kΩ DC BUFFER AD8436 – + RMS CORE – + CCF Figure 1. GENERAL DESCRIPTION The AD8436 is a new generation, translinear precision, low power, true rms-to-dc converter that is loaded with options. It computes a precise dc equivalent of the rms value of ac waveforms, including complex patterns such as those generated by switchmode power supplies and triacs. Its accuracy spans a wide range of input levels (see Figure 2) and temperatures. The ensured accuracy of ≤±0.5% and ≤10 μV output offset result from the latest Analog Devices, Inc., technology. The crest factor error is <0.5% for CF values between 1 and 10. The AD8436 delivers instant true rms results at less cost than misleading peak, averaging, or digital solutions. There is no programming expense or processor overhead to consider, and the 4 mm × 4 mm package easily fits into those tight applications. On-board buffer amplifiers enable the widest range of options for any rms-to-dc converter available, regardless of cost. For minimal applications, only a single external averaging capacitor is required. The built-in high impedance FET buffer provides an interface for external attenuators, frequency compensation, or driving low impedance loads. A matched pair of internal resistors enables an easily configurable gain-of-two or more, extending the usable input range even lower. The low power, precision input buffer makes the AD8436 attractive for use in portable multi- meters and other battery-powered applications. The precision dc output buffer offers extremely low offset voltages, thanks to bias current cancellation. Unlike digital solutions, the AD8436 has no switching circuitry limiting performance at high or low amplitudes (see Figure 2). A usable response of <100 μV and >3 V extends the dynamic range with no external scaling, accommodating the most demanding low signal conditions. 1mV 10mV 1V 100mV AD8436 GREATER INPUT DYNAMIC RANGE 100µV 3V ∆Σ SOLUTION Figure 2. Usable Dynamic Range of the AD8436 vs. ΔΣ The AD8436 operates from single or dual supplies of ±2.4 V (4.8 V) to ±18 V (36 V). A and J grades are available in a compact 4 mm × 4 mm, 20-lead chip-scale package. The operating temperature ranges are −40°C to 125°C and 0°C to 70°C. |
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