Details, datasheet, quote on part number: AD536ASE
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Features, Applications

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 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 to +125C Operation (AD536AS) PRODUCT DESCRIPTION


The 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 to 7. The wide bandwidth of the device extends the measurement capability 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 conveniently set by the user to correspond to any input level from to 2 volts rms. The AD536A is laser trimmed at the wafer level for input and output offset, positive and negative waveform symmetry (dc reversal error), and full-scale accuracy 7 V rms. As a result, no external trims are required to achieve the rated accuracy of the unit. There is full protection for both inputs and outputs. The input circuitry can take overload voltages well beyond the supply levels. 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 commercial temperature range to +70C) applications, and one grade (S) rated for the to +125C extended range. The AD536AK offers a maximum total error 0.2% of reading, and the AD536AJ and AD536AS have maximum errors 0.5% of reading. All three versions are available REV. A

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.

in either a hermetically sealed 14-pin DIP 10-pin TO-100 metal can. The AD536AS is also available a 20-pin hermetically sealed ceramic leadless chip carrier.

1. The AD536A computes the true root-mean-square level of a complex 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 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 complex signals with wide dynamic range. 3. The only external component required to perform measurements 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 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 improved bandwidth and temperature drift specifications.

One Technology Way, P.O. Box 9106, Norwood, MA 02062-9106, U.S.A. Tel: 617/329-4700 Fax: 617/326-8703

Model Min TRANSFER FUNCTION CONVERSION ACCURACY Total Error, Internal Trim1 (Figure 1) vs. Temperature, TMIN to +125C vs. Supply Voltage dc Reversal Error Total Error, External Trim1 (Figure 2) ERROR VS. CREST FACTOR2 Crest Factor to 2 Crest Factor = 3 Crest Factor = 7 FREQUENCY RESPONSE3 Bandwidth for 1% Additional Error (0.09 dB) VIN 10 mV VIN 100 mV VIN dB Bandwidth VIN 10 mV VIN 100 mV VIN 1 V AVERAGlNG TlME CONSTANT (Figure 5) INPUT CHARACTERISTICS Signal Range, 15 V Supplies Continuous rms Level Peak Transient Input Continuous rms Level, 5 V Supplies Peak Transient Input, 5 V Supplies Maximum Continuous Nondestructive Input Level (All Supply Voltages) Input Resistance Input Offset Voltage OUTPUT CHARACTERISTICS Offset Voltage, VIN = COM (Figure 1) vs. Temperature vs. Supply Voltage Swing, 15 V Supplies 5 V Supply dB OUTPUT (Figure 13) Error, VlN 7 V rms, 1 V rms Scale Factor Scale Factor TC (Uncompensated, see Figure 1 for Temperature Compensation IREF for 1 V rms IREF Range IOUT TERMINAL IOUT Scale Factor IOUT Scale Factor Tolerance Output Resistance Voltage Compliance BUFFER AMPLIFIER Input and Output Voltage Range Input Offset Voltage, 25 k Input Bias Current Input Resistance Output Current Short Circuit Current Output Resistance Small Signal Bandwidth Slew Rate4 POWER SUPPLY Voltage Rated Performance Dual Supply Single Supply Quiescent Current Total VS, 36 V, TMIN to TMAX TEMPERATURE RANGE Rated Performance Storage NUMBER OF TRANSISTORS PACKAGE OPTIONS Ceramic DIP (D-14) Metal Can TO-100 (H-10A) LCC 1 AD536AJ Typ V OUT = avg. (VIN )

% of Reading % of Reading/C % of Reading/C % of Reading/V % of Reading % of Reading
V rms V peak V rms V peak V peak k mV mV/C mV/V V dB mV/dB dB/C % of Reading/C A A/V rms

NOTES 1 Accuracy is specified for 7 V rms, or 1 kHz sine wave input with the AD536A connected as in the figure referenced. 2 Error vs. crest factor is specified as an additional error for 1 V rms rectangular pulse input, pulse width = 200 s. 3 Input voltages are expressed in volts rms, and error is percent of reading. 4 With 2k external pull-down resistor. Specifications subject to change without notice. Specifications shown in boldface are tested on all production units at final electrical test. Results from those tests are used to calculate outgoing quality levels. All min and max specifications are guaranteed, although only those shown in boldface are tested on all production units.

Supply Voltage Dual Supply. 18 V Single Supply. +36 V Internal Power 500 mW Maximum Input Voltage. 25 V Peak Buffer Maximum Input Voltage. VS Maximum Input Voltage. 25 V Peak Storage Temperature Range. to +150C Operating Temperature Range to +125C Lead Temperature Range (Soldering 60 sec). +300C ESD Rating. 1000 V

NOTES 1 Stresses above those listed under "Absolute Maximum Ratings" may cause permanent damage to the device. This is a stress rating only and functional operation of the device at these or any other conditions above those indicated in the operational section of this specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability. 2 10-Pin Header: 150C/W 20-Pin LCC: 95C/W 14-Pin Size Brazed Ceramic DIP: = 95C/W.

The AD536A is simple to connect for the majority of high accuracy rms measurements, requiring only an external capacitor to set the averaging time constant. The standard connection is shown in Figure 1. In this configuration, the AD536A will measure the rms of the ac and dc level present at the input, but will show an error for low frequency inputs as a function of the filter capacitor, CAV, as shown in Figure 5. Thus, 4 F capacitor is used, the additional average error 10 Hz will Hz it will be 1%. The accuracy at higher frequencies will be according to specification. it is desired to reject the dc input, a capacitor is added in series with the input, as shown in Figure 3, the capacitor must be nonpolar. If the AD536A is driven with power supplies with a considerable amount of high frequency ripple, it is advisable to bypass both supplies to ground with 0.1 F ceramic discs as near the device as possible.

AD536ASH AD536ASH/883B Temperature Range to +125C Package Description Side Brazed Ceramic DIP Side Brazed Ceramic DIP Header Cerdip Side Brazed Ceramic DIP Side Brazed Ceramic DIP LCC Header Package Option E-20A H-10A

NOTE 1 "S" grade chips are available tested at +25C and +125C. "J" grade chips are also available.


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