Desirable second-order voltage-controlled low-pass filter response can be achieved with this voltage-controlled filter (A). By using low-distortion, wide-bandwidth multipliers, it achieves higher cutoff frequencies than sv(itched-capacitor filters. If the circuit's RC network has a time constant less than 200 ns, it should be replaced by a lag compensator network (B).
The AD734 is an accurate high speed, four-quadrant analog multiplier that is pin-compatible with the industry-standard AD534 and provides the transfer function W = XY/U. The AD734 provides a low-impedance voltage output with a fullpower (20 V pk-pk) bandwidth of 10 MHz. Total static error (scaling, offsets, and nonlinearities combined) is 0.1% of full scale. Distortion is typically less than 80 dBc and guaranteed. The low capacitance X, Y and Z inputs are fully differential. In most applications, no external components are required to define the function.
The internal scaling (denominator) voltage U is 10 V, derived from a buried-Zener voltage reference. A new feature provides the option of substituting an external denominator voltage, allowing the use of the AD734 as a two-quadrant divider with a 1000:1 denominator range and a signal bandwidth that remains 10 MHz to a gain of 20 dB, 2 MHz at a gain of 40 dB and 200 kHz at a gain of 60 dB, for a gain-bandwidth product of 200 MHz.
The advanced performance of the AD734 is achieved by a combination of new circuit techniques, the use of a high speed complementary bipolar process and a novel approach to lasertrimming based on ac signals rather than the customary dc methods. The wide bandwidth (>40 MHz) of the AD734's input stages and the 200 MHz gain-bandwidth product of the multiplier core allow the AD734 to be used as a low distortion demodulator with input frequencies as high as 40 MHz as long as the desired output frequency is less than 10 MHz.
The AD734AQ and AD734BQ are specified for the industrial temperature range of 40 to +85 and come in a 14-lead ceramic DIP. The AD734SQ/883B, available processed to MIL-STD-883B for the military range of 55 to +125, is available in a 14-lead ceramic DIP.
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·High Performance Replacement for AD534·Multiply, Divide, Square, Square Root·Modulator, Demodulator·Wideband Gain Control, RMS-DC Conversion·Voltage-Controlled Amplifiers, Oscillators, and Filters·Demodulator with 40 MHz Input Bandwidth
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High Accuracy0.1% Typical ErrorHigh Speed10 MHz Full-Power Bandwidth450 V/ms Slew Rate200 ns Settling to 0.1% at Full PowerLow Distortion80 dBc from Any InputThird-Order IMD Typically 75 dBc at 10 MHzLow Noise94 dB SNR, 10 Hz to 20 kHz70 dB SNR, 10 Hz to 10 MHzDirect Division Mode2 MHz BW at Gain of 100
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Supply Voltage . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . ±18 V
Internal Power Dissipation2
for TJ max = 175 . . . . . . . . . . . . . . . . . . . . . . . . 500 mW
X, Y and Z Input Voltages . . . . . . . . . . . . . . . . . . . . VN to VP
Output Short Circuit Duration . . . . . . . . . . . . . . . . Indefinite
Storage Temperature Range
Q . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 65 to +150
Operating Temperature Range
AD734A, B (Industrial) . . . . . . . . . . . . . . . 40 to +85
AD734S (Military) . . . . . . . . . . . . . . . . . . 55 to +125
Lead Temperature Range (soldering 60 sec) . . . . . . . . +300
Transistor Count . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 81
ESD Rating . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 500 V
Post a Buying Lead
Required Field 
