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AD736AR-REEL Datasheet(PDF) 1 Page - Analog Devices |
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AD736AR-REEL Datasheet(HTML) 1 Page - Analog Devices |
1 / 8 page REV. C Information furnished by Analog Devices is believed to be accurate and reliable. However, no responsibility is assumed by Analog Devices for its use, nor for any infringements of patents or other rights of third parties which may result from its use. No license is granted by implication or otherwise under any patent or patent rights of Analog Devices. a Low Cost, Low Power, True RMS-to-DC Converter AD736 One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703 FUNCTIONAL BLOCK DIAGRAM FEATURES COMPUTES True RMS Value Average Rectified Value Absolute Value PROVIDES 200 mV Full-Scale Input Range (Larger Inputs with Input Attenuator) High Input Impedance of 1012 Low Input Bias Current: 25 pA max High Accuracy: 0.3 mV 0.3% of Reading RMS Conversion with Signal Crest Factors Up to 5 Wide Power Supply Range: +2.8 V, –3.2 V to 16.5 V Low Power: 200 A max Supply Current Buffered Voltage Output No External Trims Needed for Specified Accuracy AD737—An Unbuffered Voltage Output Version with Chip Power Down Is Also Available PRODUCT DESCRIPTION The AD736 is a low power, precision, monolithic true rms-to-dc converter. It is laser trimmed to provide a maximum error of ±0.3 mV ±0.3% of reading with sine-wave inputs. Fur- thermore, it maintains high accuracy while measuring a wide range of input waveforms, including variable duty cycle pulses and triac (phase) controlled sine waves. The low cost and small physical size of this converter make it suitable for upgrading the performance of non-rms “precision rectifiers” in many applica- tions. Compared to these circuits, the AD736 offers higher ac- curacy at equal or lower cost. The AD736 can compute the rms value of both ac and dc input voltages. It can also be operated ac coupled by adding one ex- ternal capacitor. In this mode, the AD736 can resolve input sig- nal levels of 100 µV rms or less, despite variations in temperature or supply voltage. High accuracy is also maintained for input waveforms with crest factors of 1 to 3. In addition, crest factors as high as 5 can be measured (while introducing only 2.5% additional error) at the 200 mV full-scale input level. The AD736 has its own output buffer amplifier, thereby provid- ing a great deal of design flexibility. Requiring only 200 µA of power supply current, the AD736 is optimized for use in por- table multimeters and other battery powered applications. The AD736 allows the choice of two signal input terminals: a high impedance (10 12 Ω) FET input which will directly interface with high Z input attenuators and a low impedance (8 k Ω) input which allows the measurement of 300 mV input levels, while operating from the minimum power supply voltage of +2.8 V, –3.2 V. The two inputs may be used either singly or differentially. The AD736 achieves a 1% of reading error bandwidth exceeding 10 kHz for input amplitudes from 20 mV rms to 200 mV rms while consuming only 1 mW. The AD736 is available in four performance grades. The AD736J and AD736K grades are rated over the commercial tem- perature range of 0 °C to +70°C. The AD736A and AD736B grades are rated over the industrial temperature range of –40 °C to +85 °C. The AD736 is available in three low-cost, 8-pin packages: plastic mini-DIP, plastic SO and hermetic cerdip. PRODUCT HIGHLIGHTS 1. The AD736 is capable of computing the average rectified value, absolute value or true rms value of various input signals. 2. Only one external component, an averaging capacitor, is required for the AD736 to perform true rms measurement. 3. The low power consumption of 1 mW makes the AD736 suitable for many battery powered applications. 4. A high input impedance of 10 12 Ω eliminates the need for an external buffer when interfacing with input attenuators. 5. A low impedance input is available for those applications requiring up to 300 mV rms input signal operating from low power supply voltages. |
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