Analog Devices Inc. AD734BQ

Overview

AD734BQ from Analog Devices is a high-accuracy, 10 MHz four-quadrant analog multiplier/divider IC with 0.1% total static error, 450 V/μs slew rate, and 200 ns settling to 0.1% at full power. It implements W = XY/U transfer function and operates across −40°C to +85°C in industrial applications including precision AGC loops, wideband RMS-to-DC conversion, and low-distortion demodulation up to 40 MHz input.

For engineers reviewing the AD734BQ datasheet, AD734BQ pinout, AD734BQ application, or AD734BQ equivalent, this page delivers verified specifications, exact pin functions, confirmed industrial temperature range (−40°C to +85°C), differential X/Y/Z interfaces, direct denominator control capability, and real-world use cases in modulators, voltage-controlled amplifiers, and precision division circuits.

Technical Context

The AD734BQ uses a high-speed complementary bipolar process and laser-trimmed translinear core to achieve 10 MHz full-power bandwidth and −80 dBc distortion. Its differential X, Y, and Z inputs support ±12.5 V common-mode range and 50 kΩ differential resistance, rejecting common-mode signals while enabling precise four-quadrant multiplication.

Denominator control is implemented via U0/U1/U2 pins with internal 10 V buried-Zener reference; external denominator voltage (10 mV–10 V) can be substituted by disabling DD pin, delivering 200 MHz gain-bandwidth product in divider mode. Output amplifier provides ±12 V swing, 450 V/μs slew rate, and stable operation into ≥100 pF capacitive loads.

Key Specifications

Pinout & Package

AD734BQ is supplied in a 14-lead CERDIP (Q-14) package with 110°C/W thermal resistance, hermetically sealed for stability in harsh industrial conditions.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar analog multiplier/divider applications.

Compared with AD534JN and MPY100KG, the AD734BQ delivers 10× higher bandwidth, 20 dB lower distortion, differential input noise rejection, and programmable denominator control-making it the only option for precision wideband division, demodulation, and AGC loops demanding <0.1% error and sub-200 ns settling.

Availability

AD734BQ is available at Aetrix Electronics and suitable for industrial instrumentation, medical ultrasound systems, and RF test equipment requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD734BQ includes scheduled delivery planning, volume procurement assistance, BOM continuity management, traceable sourcing, and lifecycle availability coordination for OEM customers, industrial embedded developers, connected-device designers, and electronics production programs.

Manufacturer

Analog Devices is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, founded in 1965 and headquartered in Wilmington, MA.

The AD734BQ belongs to Analog Devices' precision analog multiplier family, designed specifically for high-speed, low-distortion signal processing in industrial, test & measurement, and communications systems where accuracy, bandwidth, and temperature stability are critical.

FAQ

What is the operating temperature range specified for the AD734BQ?

The AD734BQ is rated for the industrial temperature range of −40°C to +85°C, as explicitly stated in the datasheet's ordering guide and absolute maximum ratings table. This specification applies to both the AD734AQ and AD734BQ variants and is validated across all key parameters including total static error, distortion, and bandwidth. The AD734BQ achieves this range using the 14-lead CERDIP package, which provides hermetic sealing and superior thermal performance versus plastic packages.

Does the AD734BQ support true four-quadrant multiplication?

Yes, the AD734BQ fully supports true four-quadrant multiplication, meaning it correctly computes W = XY/U for all sign combinations of X and Y inputs (± × ±). This is enabled by its differential X and Y input stages, each accepting ±12.5 V common-mode signals and producing X = X1 − X2 and Y = Y1 − Y2. The translinear core processes signed currents, ensuring algebraic correctness across all quadrants without clipping or sign ambiguity-unlike two-quadrant multipliers that restrict input polarity.

How does denominator control work on the AD734BQ?

Denominator control on the AD734BQ is implemented through pins U0, U1, and U2, with internal 10 V buried-Zener reference. To use external denominator voltage U, connect DD (Pin 13) to VP to disable the internal source, then apply voltage across U1–U2. The laser-trimmed 28 kΩ resistor sets U = V_U1–U2, supporting 10 mV–10 V range. For highest accuracy, use the buffered ER reference with external circuitry (e.g., Figure 23) to cancel V_BE error-enabling precise division with 200 MHz gain-bandwidth product.

What is the maximum input frequency supported when using the AD734BQ as a demodulator?

The AD734BQ supports demodulator input frequencies up to 40 MHz, as confirmed in the General Description and Functional Description sections. This is enabled by the >40 MHz bandwidth of its X and Y input stages. However, the output stage (W) limits full-power bandwidth to 10 MHz, so the demodulated baseband output must remain ≤10 MHz. The device achieves −80 dBc distortion at these frequencies due to its translinear core and AC laser trimming-making it suitable for high-frequency IF demodulation in RF test equipment and communications receivers.

Is the AD734BQ pin-compatible with the AD534?

Yes, the AD734BQ is pin-compatible with the AD534 in standard multiplier configurations, sharing identical 14-lead PDIP/CERDIP footprints and core pin assignments (X1/X2, Y1/Y2, Z1/Z2, W, VP, VN). However, AD734BQ repurposes Pins 3 (U0), 4 (U1), 5 (U2), 9 (ER), and 13 (DD) for denominator control-functions absent in the AD534. In legacy AD534 designs, these pins are NC or unused; thus, direct substitution yields immediate improvements in speed, accuracy, and functionality without PCB changes, provided U-related pins are properly terminated.