AD7884BQ

Overview

The AD7884BQ is a 16-bit monolithic analog-to-digital converter featuring an internal sample-and-hold and a conversion time of 5.3 µs, achieving a maximum throughput rate of 166 kSPS via a two-pass flash architecture. It operates from ±5 V supplies with a 3 V reference input. The device supports ±5 V and ±3 V analog input ranges and provides a 16-bit parallel data output structure. Integral nonlinearity is specified at ±0.0075% FSR max, with a typical signal-to-noise plus distortion ratio of 84 dB. It functions within a temperature range of -40°C to +85°C and utilizes a 40-lead CERDIP package.

Feature Summary

• Monolithic construction utilizing a two-pass flash architecture for high-speed 16-bit resolution.
• Internal oscillator controls conversion timing, eliminating the need for external clocking circuitry.
• Integrated sample-and-hold amplifier allows simultaneous acquisition during the second conversion phase.
• Factory-trimmed on-chip resistors ensure precise tracking of the reference voltage.

Applications

• Automatic Test Equipment
• Medical Instrumentation
• Industrial Control Systems
• Data Acquisition Systems
• Robotics

Procurement Notes

Verify the specific ordering suffix BQ corresponds to the required linearity specifications and temperature grade (-40°C to +85°C) against the manufacturer's current ordering guide. Confirm that the 40-lead CERDIP package availability aligns with the target production timeline. Ensure the datasheet revision matches the design requirements for timing characteristics and absolute maximum ratings.

Selection Notes

Select this component when a 16-bit resolution and 166 kSPS throughput are required without external clock generation. The dual input range capability (±5 V or ±3 V) offers flexibility for different signal levels. Consider the power dissipation of approximately 250 mW and the requirement for ±5 V analog supplies. The parallel interface necessitates sufficient microprocessor bus lines for the 16-bit data word.

Part Context

The AD7884BQ belongs to the AD7884/AD7885 family of LC2MOS high-speed sampling ADCs. While the AD7885 variant features an 8-bit byte-read structure, the AD7884 provides a full 16-bit parallel output. The 'B' suffix indicates enhanced linearity performance compared to the standard 'A' version, and 'Q' denotes the ceramic dual in-line package.

Replacement Considerations

The AD7884AP serves as a parameter-equivalent alternative within the same package type but with standard linearity specifications rather than the enhanced B-grade performance.