AD9002BD

Overview

The AD9002BD is an 8-bit high-speed monolithic analog-to-digital converter fabricated using an advanced bipolar process. It supports encode rates exceeding 150 MSPS with a large signal analog input bandwidth of 160 MHz. The device operates on a single –5.2 V supply and dissipates 750 mW. It features ECL-compatible parallel outputs, an overflow bit for overvoltage indication, and external hysteresis control. The AD9002BD provides 0.5 LSB linearity and functions within the industrial temperature range of –25 °C to +85 °C.

Feature Summary

• High-speed conversion capability utilizing 256 parallel comparator stages for accurate acquisition of high-speed pulse inputs without external track-and-hold circuits.
• Integrated overflow detection and inhibit functionality to manage overrange inputs and optimize data output polarity.
• Adjustable comparator sensitivity via an external hysteresis control pin to enhance noise immunity in harsh environments.
• Low input capacitance design that facilitates direct interfacing with wide-bandwidth amplifiers and minimizes aperture delay errors.

Applications

• Radar Systems
• Digital Oscilloscopes and Automated Test Equipment (ATE)
• Laser and Radar Warning Receivers
• Electronic Warfare (ECM, ECCM, ESM)
• Communication and Signal Intelligence

Procurement Notes

Verify the specific ordering suffix D-28 corresponds to the required 28-lead side-brazed ceramic dual in-line package. Confirm the linearity grade matches the 0.5 LSB specification required for the application. Ensure environmental ratings align with the industrial temperature range of –25 °C to +85 °C. Check for MIL-STD-883 compliance if military-grade reliability is mandated, as this may require different part numbers.

Selection Notes

Select the AD9002BD when 0.5 LSB linearity is critical, distinguishing it from the AD9002AD which offers 0.75 LSB. Choose this component for applications requiring a 160 MHz input bandwidth and 150 MSPS sampling rate. Consider the ECL logic compatibility for digital interface requirements. Evaluate the need for external hysteresis adjustment based on system noise levels. Verify power supply constraints match the –5.2 V nominal requirement.

Part Context

The AD9002 series comprises high-speed 8-bit flash ADCs available in industrial and military temperature grades. The BD suffix denotes the industrial grade variant with 0.5 LSB linearity, packaged in a ceramic DIP. Other variants include the AD/BJ models with similar electrical characteristics but potentially different packaging or linearity options. The series is designed for demanding RF and microwave applications requiring fast, accurate digitization.

Replacement Considerations

Public confirmed substitute part numbers are not provided in the source material.

FAQ

How does the AD9002BD handle overvoltage inputs?

The device incorporates an overflow bit that indicates overrange inputs (VIN > +VREF). The OVERFLOW INH pin controls the output polarity for these conditions, allowing configuration between return-to-zero and nonreturn-to-zero operation.

What is the purpose of the HYSTERESIS pin?

The HYSTERESIS control pin allows adjustment of the comparator hysteresis from 0 mV to 10 mV by varying the voltage from –5.2 V to –2.2 V. This feature optimizes comparator sensitivity and improves noise immunity.

What logic family do the digital outputs support?

The AD9002BD provides ECL compatible output latches. It is compatible with standard ECL logic families, including 10K and 10KH, though 100K ECL levels are only compatible over a limited temperature range.