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AD636JD Datasheet(PDF) 1 Page - Analog Devices |
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AD636JD Datasheet(HTML) 1 Page - Analog Devices |
1 / 8 page REV. B 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 Level, True RMS-to-DC Converter AD636 PRODUCT DESCRIPTION The AD636 is a low power monolithic IC which performs true rms-to-dc conversion on low level signals. It offers performance which is comparable or superior to that of hybrid and modular converters costing much more. The AD636 is specified for a signal range of 0 mV to 200 mV rms. Crest factors up to 6 can be accommodated with less than 0.5% additional error, allowing accurate measurement of complex input waveforms. The low power supply current requirement of the AD636, typi- cally 800 µA, allows it to be used in battery-powered portable instruments. A wide range of power supplies can be used, from ±2.5 V to ±16.5 V or a single +5 V to +24 V supply. The input and output terminals are fully protected; the input signal can exceed the power supply with no damage to the device (allowing the presence of input signals in the absence of supply voltage) and the output buffer amplifier is short-circuit protected. The AD636 includes an auxiliary dB output. This signal is derived from an internal circuit point which represents the loga- rithm of the rms output. The 0 dB reference level is set by an externally supplied current and can be selected by the user to correspond to any input level from 0 dBm (774.6 mV) to –20 dBm (77.46 mV). Frequency response ranges from 1.2 MHz at a 0 dBm level to over 10 kHz at –50 dBm. The AD636 is designed for ease of use. The device is factory- trimmed at the wafer level for input and output offset, positive and negative waveform symmetry (dc reversal error), and full- scale accuracy at 200 mV rms. Thus no external trims are re- quired to achieve full-rated accuracy. AD636 is available in two accuracy grades; the AD636J total error of ±0.5 mV ±0.06% of reading, and the AD636K FEATURES True RMS-to-DC Conversion 200 mV Full Scale Laser-Trimmed to High Accuracy 0.5% Max Error (AD636K) 1.0% Max Error (AD636J) Wide Response Capability: Computes RMS of AC and DC Signals 1 MHz –3 dB Bandwidth: V RMS >100 mV Signal Crest Factor of 6 for 0.5% Error dB Output with 50 dB Range Low Power: 800 A Quiescent Current Single or Dual Supply Operation Monolithic Integrated Circuit Low Cost Available in Chip Form PIN CONNECTIONS & FUNCTIONAL BLOCK DIAGRAM is accurate within ±0.2 mV to ±0.3% of reading. Both versions are specified for the 0 °C to +70°C temperature range, and are offered in either a hermetically sealed 14-pin DIP or a 10-lead TO-100 metal can. Chips are also available. PRODUCT HIGHLIGHTS 1. The AD636 computes the true root-mean-square of a com- plex ac (or ac plus dc) input signal and gives an equivalent dc output level. The true rms value of a waveform is a more useful quantity than the average rectified value since it is a measure of the power in the signal. The rms value of an ac-coupled signal is also its standard deviation. 2. The 200 millivolt full-scale range of the AD636 is compatible with many popular display-oriented analog-to-digital con- verters. The low power supply current requirement permits use in battery powered hand-held instruments. 3. The only external component required to perform measure- ments to the fully specified accuracy is the averaging capaci- tor. The value of this capacitor can be selected for the desired trade-off of low frequency accuracy, ripple, and settling time. 4. The on-chip buffer amplifier can be used to buffer either the input or the output. Used as an input buffer, it provides accurate performance from standard 10 M Ω input attenua- tors. As an output buffer, it can supply up to 5 milliamps of output current. 5. The AD636 will operate over a wide range of power supply voltages, including single +5 V to +24 V or split ±2.5 V to ±16.5 V sources. A standard 9 V battery will provide several hundred hours of continuous operation. One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 781/329-4700 World Wide Web Site: http://www.analog.com Fax: 781/326-8703 © Analog Devices, Inc., 1999 VIN NC –VS CAV dB BUF OUT BUF IN +VS NC NC NC COMMON RL IOUT AD636 14 13 12 11 10 9 8 1 2 3 4 5 6 7 ABSOLUTE VALUE SQUARER DIVIDER BUF SQUARER DIVIDER ABSOLUTE VALUE AD636 BUF OUT dB CAV BUF IN RL COMMON +VS VIN –VS IOUT CURRENT MIRROR +– + – CURRENT MIRROR BUF 10k 10k 10k 10k NC = NO CONNECT |
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