AD734| Datasheet

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FEATURES High Accuracy 0.1% Typical Error High Speed 10 MHz Full-Power Bandwidth 450 V/ s Slew Rate 200 ns Settling to 0.1% 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 APPLICATIONS 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 PRODUCT DESCRIPTION
X1 1 X INPUT X2 2 U0 3 DENOMINATOR INTERFACE U1 4

10 MHz, 4-Quadrant Multiplier/Divider AD734
CONNECTION DIAGRAM 14-Lead DIP (Q Package and N Package)
14 VP POSITIVE SUPPLY 13 DD DENOMINATOR DISABLE

AD734

12 W OUTPUT Z INPUT

TOP VIEW 11 Z1 (Not to Scale) 10 Z2 U2 5 Y1 6

9 ER REFERENCE VOLTAGE 8 VN NEGATIVE SUPPLY

Y INPUT

Y2 7

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 C to +85 C and come in a 14-lead ceramic DIP. The AD734SQ/883B, available processed to MIL-STD-883B for the military range of 55 C to +125 C, is available in a 14-lead ceramic DIP.
PRODUCT HIGHLIGHTS

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 REV. C
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.

The AD734 embodies more than two decades of experience in the design and manufacture of analog multipliers, to provide: 1. A new output amplifier design with more than twenty times the slew-rate of the AD534 (450 V/us versus 20 V/us) for a full power (20 V pk-pk) bandwidth of 10 MHz. 2. Very low distortion, even at full power, through the use of circuit and trimming techniques that virtually eliminate all of the spurious nonlinearities found in earlier designs. 3. Direct control of the denominator, resulting in higher multiplier accuracy and a gain-bandwidth product at small denominator values that is typically 200 times greater than that of the AD534 in divider modes. 4. Very clean transient response, achieved through the use of a novel input stage design and wide-band output amplifier, which also ensure that distortion remains low even at high frequencies. 5. Superior noise performance by careful choice of device geometries and operating conditions, which provide a guaranteed 88 dB of dynamic range in a 20
kHz bandwidth.

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