ADI AD734AQ

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 full power (20 V p - p) 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 laser trimming 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.

• High accuracy 0.7% typical error
• High speed 10 MHz full power bandwidth, 450 V/μs slew rate, 200 ns settling to 0.7% at full power
• Low distortion −80 dBc from any input, Third - order IMD typically −75 dBc at 10 MHz
• Low noise 94 dB SNR, 10 Hz to 20 kHz; 70 dB SNR, 10 Hz to 10 MHz
• Direct division mode 2 MHz BW at gain of 100

• High performance replacement for AD534
• Multiply, divide, square, square root
• Modulators, demodulators
• Wideband gain control, rms - to - dc conversion
• Voltage - controlled amplifiers, oscillators, and filters
• Demodulator with 40 MHz input bandwidth