AD734AQ

Overview

The AD734AQ is a high-speed, four-quadrant analog multiplier and divider manufactured by Analog Devices. It provides a transfer function of W = XY/U with a full power bandwidth of 10 MHz at 20 V p-p output swing. The device features a total static error of 0.1% typical and distortion typically less than -80 dBc. It includes direct denominator control allowing an external voltage range from 10 mV to 10 V. The AD734AQ operates within an industrial temperature range of -40°C to +85°C and is available in 14-lead CERDIP and PDIP packages.

Feature Summary

• High-speed complementary bipolar process enabling 10 MHz full power bandwidth and 450 V/μs slew rate.
• Direct denominator control interface allows substitution of the internal 10 V reference with external voltages for two-quadrant division.
• Low distortion performance achieved through novel laser trimming techniques based on AC signals rather than DC methods.
• Fully differential X, Y, and Z inputs with low capacitance and low bias current characteristics.

Applications

• High-performance replacement for AD534
• Modulators and demodulators
• Wideband gain control and RMS-to-DC conversion
• Voltage-controlled amplifiers, oscillators, and filters

Procurement Notes

Verify that the specific orderable part number matches the required package type (CERDIP or PDIP) and temperature grade (Industrial AQ/BQ). Confirm pin compatibility if replacing legacy AD534 designs, noting differences in internal connections for pins 3, 5, 9, and 13. Ensure supply decoupling capacitors are connected to the load ground to maintain stability at high frequencies.

Selection Notes

Select the AD734AQ when a 10 MHz full-power bandwidth and 0.1% static error are required for analog signal processing. Choose this component over standard multipliers if direct denominator control is needed for precise two-quadrant division or automatic gain control applications. Verify that the input common-mode range and output swing requirements fit within the ±8 V to ±16.5 V supply constraints.

Part Context

The AD734 series represents an evolution of Analog Devices' analog multiplier technology, offering significantly improved speed and accuracy compared to the industry-standard AD534. While pin-compatible, it introduces advanced features like direct denominator control and higher slew rates. The AD734AQ specifically denotes the industrial temperature grade variant, suitable for general-purpose high-frequency analog computation tasks.

Replacement Considerations

The AD734 is pin-compatible with the AD534. When substituting, note that internal connections for pins 3, 5, 9, and 13 differ between the two devices. Direct replacement may require adjusting external circuitry to accommodate the new denominator control capabilities or to utilize the existing AD534 configuration without leveraging the AD734's enhanced features.

FAQ

How does the AD734 handle the denominator voltage in divider mode?

The AD734 allows the internal 10 V denominator to be disabled via Pin 13 (DD). An external voltage between 10 mV and 10 V can then be applied to Pins U1 and U2 to directly control the denominator, enabling accurate two-quadrant division.

What is the maximum operating supply voltage for the AD734AQ?

The absolute maximum supply voltage rating is ±18 V. However, the specified operating supply range is ±8 V to ±16.5 V.

Can the AD734 operate as a demodulator with high input frequencies?

Yes, the AD734 can be used as a low-distortion demodulator with input frequencies as high as 40 MHz, provided the desired output frequency remains below 10 MHz.