AD636 AD [Analog Devices], AD636 Datasheet
AD636
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AD636 Summary of contents
Page 1
... Frequency response ranges from 1.2 MHz 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 ...
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... S –2 V) –2 V) 0.8 2 100 300 8 10 (+5 mA, (+5 mA, –130 A) –130 +3, –5 +2, –2.5 16.5 +2, –2.5 +5 +24 +5 0.80 1.00 –2– AD636K Typ Max Units 2 V avg OUT IN 0.2 0 Reading 0.1 0.005 Reading/ C 0.1 0. Reading/V 0 Reading 0.1 0 Reading –0 Reading –0 Reading 25 ms/ F CAV ...
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... Internal Power Dissipation . . . . . . . . . . . . . . . . . . . . 500 mW Maximum Input Voltage . . . . . . . . . . . . . . . . . . . . Storage Temperature Range – +150 C Operating Temperature Range AD636J +70 C Lead Temperature Range (Soldering 60 sec +300 C ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1000 V NOTES 1 Stresses above those listed under Absolute Maximum Ratings may cause perma- nent damage to the device. This is a stress rating only ...
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... IN CHOOSING THE AVERAGING TIME CONSTANT The AD636 will compute the rms of both ac and dc signals. If the input is a slowly-varying dc voltage, the output of the AD636 will track the input exactly. At higher frequencies, the average output of the AD636 will approach the rms value of the input signal ...
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... The actual computation performed by the AD636 follows the equation: 100mV 1V Figure simplified schematic of the AD636 subdivided into four major sections: absolute value circuit (active rectifier), squarer/divider, current mirror, and buffer amplifier. The input voltage, V ...
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... Figure 10 shows a simplified schematic of the buffer. Since the output of an rms-to-dc converter is always positive not necessary to use a traditional complementary Class AB output stage. In the AD636 buffer, a Class A emitter follower is used instead. In addition to excellent positive output voltage swing, this configuration allows the output to swing fully down to ground in single-supply applications without the problems associated with most IC operational amplifiers ...
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... For example, a rectangular pulse train with a 1% duty cycle has a crest factor of 10 (C. Figure curve of reading error for the AD636 for a 200 mV rms input signal with crest factors from rectangular pulse train (pulse width 200 s) was used for this test since it is the worst-case waveform for rms measurement (all the energy is contained in the peaks) ...
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... CURRENT 10 5 1.2V MIRROR AD589 6 9 10k + LIN – BUF 8 7 10k dB + LIN C7 6 +4.4 VOLTS 1 14 ABSOLUTE R2 VALUE 12. +1.2 VOLTS AD636 + + SQUARER + DIVIDER 4 11 250 A CURRENT 5 10 MIRROR 100 10k 10 F BUF 8 7 – R10 10k 20k +4.7 VOLTS +3500ppm 1% TC RESISTOR ...