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AD536AJCHIPS Scheda tecnica(PDF) 1 Page - Analog Devices |
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AD536AJCHIPS Scheda tecnica(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 AD536A 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 Integrated Circuit True RMS-to-DC Converter FEATURES True RMS-to-DC Conversion Laser-Trimmed to High Accuracy 0.2% Max Error (AD536AK) 0.5% Max Error (AD536AJ) Wide Response Capability: Computes RMS of AC and DC Signals 450 kHz Bandwidth: V rms > 100 mV 2 MHz Bandwidth: V rms > 1 V Signal Crest Factor of 7 for 1% Error dB Output with 60 dB Range Low Power: 1.2 mA Quiescent Current Single or Dual Supply Operation Monolithic Integrated Circuit –55 C to +125 C Operation (AD536AS) PRODUCT DESCRIPTION The AD536A is a complete monolithic integrated circuit which performs true rms-to-dc conversion. It offers performance which is comparable or superior to that of hybrid or modular units costing much more. The AD536A directly computes the true rms value of any complex input waveform containing ac and dc components. It has a crest factor compensation scheme which allows measurements with 1% error at crest factors up to 7. The wide bandwidth of the device extends the measurement capabi- lity to 300 kHz with 3 dB error for signal levels above 100 mV. An important feature of the AD536A not previously available in rms converters is an auxiliary dB output. The logarithm of the rms output signal is brought out to a separate pin to allow the dB conversion, with a useful dynamic range of 60 dB. Using an externally supplied reference current, the 0 dB level can be con- veniently set by the user to correspond to any input level from 0.1 to 2 volts rms. The AD536A is laser trimmed at the wafer level for input and output offset, positive and negative waveform symmetry (dc re- versal error), and full-scale accuracy at 7 V rms. As a result, no external trims are required to achieve the rated unit accuracy. There is full protection for both inputs and outputs. The input circuitry can take overload voltages well beyond the supply lev- els. Loss of supply voltage with inputs connected will not cause unit failure. The output is short-circuit protected. The AD536A is available in two accuracy grades (J, K) for com- mercial temperature range (0 °C to +70°C) applications, and one grade (S) rated for the –55 °C to +125°C extended range. The AD536AK offers a maximum total error of ±2 mV ±0.2% of reading, and the AD536AJ and AD536AS have maximum errors of ±5 mV ±0.5% of reading. All three versions are available in either a hermetically sealed 14-lead DIP or 10-pin TO-100 metal can. The AD536AS is also available in a 20-leadless her- metically sealed ceramic chip carrier. PRODUCT HIGHLIGHTS 1. The AD536A computes the true root-mean-square level of a complex ac (or ac plus dc) input signal and gives an equiva- lent dc output level. The true rms value of a waveform is a more useful quantity than the average rectified value since it relates directly to the power of the signal. The rms value of a statistical signal also relates to its standard deviation. 2. The crest factor of a waveform is the ratio of the peak signal swing to the rms value. The crest factor compensation scheme of the AD536A allows measurement of highly com- plex signals with wide dynamic range. 3. The only external component required to perform measure- ments to the fully specified accuracy is the capacitor which sets the averaging period. The value of this capacitor determines the low frequency ac accuracy, ripple level and settling time. 4. The AD536A will operate equally well from split supplies or a single supply with total supply levels from 5 to 36 volts. The one milliampere quiescent supply current makes the device well-suited for a wide variety of remote controllers and battery powered instruments. 5. The AD536A directly replaces the AD536 and provides im- proved bandwidth and temperature drift specifications. PIN CONFIGURATIONS AND FUNCTIONAL BLOCK DIAGRAMS LCC (E-20A) Package 4 5 6 7 8 3 2 1 20 19 18 17 16 15 14 9 10 11 12 13 BUF CURRENT MIRROR ABSOLUTE VALUE SQUARER DIVIDER 25k 25k AD536A VIN NC CAV dB +VS NC NC NC COM RL IOUT NC = NO CONNECT –VS BUF OUT BUF IN NC NC NC NC NC NC TO-116 (D-14) and Q-14 Package 14 13 12 11 10 9 8 1 2 3 4 5 6 7 ABSOLUTE VALUE CURRENT MIRROR 25k 25k BUF SQUARER DIVIDER AD536A NC = NO CONNECT VIN NC –VS CAV dB BUF OUT BUF IN +VS NC NC NC COM RL IOUT TO-100 (H-10A) Package BUF 25k ABSOLUTE VALUE SQUARER DIVIDER CURRENT MIRROR 25k AD536A VIN CAV dB +VS COM RL IOUT –VS BUF OUT BUF IN |
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