AD7884BPZ

Overview

The AD7884BPZ is a 16-bit monolithic analog-to-digital converter utilizing LC2MOS technology and a two-pass flash architecture. It features an internal sample-and-hold amplifier, a conversion time of 5.3 µs, and a maximum throughput rate of 166 kSPS. The device operates from ±5 V power supplies with a 3 V reference input. It provides selectable analog input ranges of ±5 V or ±3 V and outputs data in twos complement code via a 16-bit parallel interface. The component is housed in a 44-lead Plastic Leaded Chip Carrier (PLCC) package and supports an operating temperature range from -40 °C to +85 °C.

Feature Summary

• Monolithic construction integrating a 16-bit accurate DAC for error correction
• Internal oscillator controls the conversion process without external clocking
• Two-pass flash architecture enables high-speed sampling and low latency
• Selectable analog input ranges for flexible signal conditioning

Applications

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

Procurement Notes

Verify the ordering suffix BPZ corresponds to the 44-lead PLCC package and the B linearity grade. Confirm the temperature range matches the specified -40 °C to +85 °C industrial rating. Ensure the datasheet revision aligns with the required specifications for integral nonlinearity and gain error tolerances before finalizing procurement.

Selection Notes

Select this component when a 16-bit resolution with high throughput is required. The AD7884 offers a parallel interface suitable for direct microprocessor connection. Consider the AD7885 if a byte-read structure is preferred over the full 16-bit parallel word output. Verify that the system can accommodate the dual ±5 V supply requirement and the specific 3 V reference voltage.

Part Context

The AD7884 belongs to Analog Devices' LC2MOS family of high-speed sampling ADCs. It shares architectural similarities with the AD7885, differing primarily in the digital output interface configuration. The device utilizes a proprietary two-pass flash technique to achieve 16-bit accuracy at speeds up to 166 kSPS, distinguishing it from standard successive approximation register converters.

Replacement Considerations

The AD7885ABP serves as a functional substitute with identical electrical specifications but utilizes an 8-bit byte-read interface instead of the 16-bit parallel output. Designers must adjust the software driver and hardware connections to accommodate the sequential byte reading mode when replacing the AD7884BPZ with the AD7885ABP.