Analog Devices Inc. AD9002BJ

Overview

AD9002BJ from Analog Devices is an 8-bit, high-speed monolithic analog-to-digital converter (ADC) with 150 MSPS encode rate, 160 MHz large-signal analog input bandwidth, and ECL-compatible digital outputs. It operates from a –5.2 V single supply, delivers 750 mW typical power dissipation, and features 0.5 LSB differential linearity over –25°C to +85°C - used in radar warning receivers and digital oscilloscopes requiring precise high-frequency sampling without external track-and-hold.

For engineers reviewing the AD9002BJ datasheet, AD9002BJ pinout, AD9002BJ application, or AD9002BJ equivalent, this page provides verified technical context, real-world timing behavior, package-specific layout guidance, ECL interface constraints, and validated alternatives for high-speed signal acquisition systems.

Technical Context

The AD9002BJ employs 256 parallel comparator stages with decoded logic driving ECL latches, enabling 150 MSPS conversion without pipeline latency. Its wide 160 MHz analog input bandwidth stems from optimized comparator design and tight device layout, supporting accurate pulse capture at Nyquist rates up to 75 MHz.

It uses a resistor ladder reference architecture with externally accessible +VREF, –VREF, and REFMID pins, allowing fine-tuning of integral linearity. The HYSTERESIS pin adjusts comparator sensitivity from 0 mV to 10 mV, while OVERFLOW INH enables return-to-zero or nonreturn-to-zero overrange handling.

Key Specifications

Pinout & Package

AD9002BJ is packaged in a 28-lead ceramic chip carrier with J-formed leads (JLCC, J-28), rated for –25°C to +85°C operation. This hermetic package provides stable electrical performance and thermal reliability in demanding RF and defense applications.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed ADC applications.

Compared with AD9002BD and AD9002AJ, the AD9002BJ uniquely combines 0.5 LSB linearity, J-28 surface-mount packaging, and industrial temperature rating - making it optimal for new designs prioritizing precision, board area, and thermal robustness without military-grade qualification.

Availability

AD9002BJ is available at Aetrix Electronics and suitable for radar warning receivers, digital oscilloscopes, and communication signal intelligence systems requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD9002BJ 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 technologies, headquartered in Norwood, MA.

The AD9002BJ belongs to Analog Devices' high-speed data converter product line, engineered specifically for demanding RF, defense, and test instrumentation applications where speed, linearity, and timing fidelity are critical.

FAQ

What is the guaranteed differential linearity specification for AD9002BJ?

The AD9002BJ guarantees ≤0.5 LSB differential linearity over its full operating temperature range of –25°C to +85°C, as confirmed in the Rev. G datasheet's Electrical Characteristics table under AD9002BD/BJ column. This specification ensures monotonic behavior and absence of missing codes, critical for accurate amplitude measurement in radar and oscilloscope applications using the AD9002BJ.

Does AD9002BJ require external termination for its ECL outputs?

Yes, AD9002BJ ECL outputs must be terminated to –2 V via 100 Ω resistors per output pin to prevent signal reflection and ensure clean edge integrity at 150 MSPS. This termination requirement is explicitly stated in the datasheet's "DIGITAL OUTPUTS" section and applies to all eight data bits (D1–D8) and the OVERFLOW signal. Failure to terminate degrades timing margins and increases bit error rate in the AD9002BJ interface.

Can AD9002BJ operate with a single-ended ENCODE signal?

No, AD9002BJ requires a true differential ECL-level ENCODE signal applied to pins 7 and 8. However, a single-ended TTL or CMOS clock can be converted using the AD96685 high-speed ECL comparator, as shown in Figure 5 of the AD9002BJ datasheet. Direct single-ended drive violates the differential input specification and risks metastability or timing failure in the AD9002BJ sampling circuit.

What is the purpose of the REFMID pin on AD9002BJ?

The REFMID pin provides access to the midpoint tap of the internal resistor ladder reference network. Adjusting voltage at REFMID allows correction of integral linearity errors caused by ladder resistor mismatches - a technique documented in the AD9002BJ Application Information section. This capability enables system-level calibration to achieve <0.5 LSB INL in precision measurement systems using the AD9002BJ.

Is AD9002BJ compatible with modern FPGA I/O standards?

AD9002BJ outputs ECL-compatible logic levels (–1.1 V for HIGH, –1.5 V for LOW), which are not directly compatible with LVDS, HSTL, or SSTL FPGA I/O banks. Interface requires level translation - typically via ECL-to-LVDS translators like the ON Semiconductor NB7L14M or discrete resistor networks. This constraint is inherent to the AD9002BJ's bipolar process and must be accounted for in digital capture subsystem design.