AD7884APZ

Overview

The AD7884APZ is a 16-bit monolithic analog-to-digital converter featuring an internal sample-and-hold amplifier and a two-pass flash architecture. It achieves a maximum throughput rate of 166 kSPS with a conversion time of 5.3 µs. The device operates from ±5 V power supplies and requires a 3 V reference input. It supports both ±5 V and ±3 V analog input ranges, utilizing force and sense pins for accurate signal conditioning. The AD7884 provides a 16-bit parallel data output in two's complement code, controlled via CS and RD inputs.

Feature Summary

• Monolithic construction integrating a 16-bit DAC and residue amplifier for high-speed two-pass flash conversion.
• Internal oscillator controls the conversion sequence, eliminating external timing requirements.
• Force and sense analog input pins enable precise configuration for ±5 V or ±3 V input ranges.
• Parallel digital interface allows direct connection to microprocessors using standard control signals.

Applications

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

Procurement Notes

Verify the package type matches the application requirements, as the AD7884 series is available in 40-lead CERDIP and 44-lead PLCC configurations. Confirm that the specific suffix corresponds to the desired temperature range and linearity grade. Ensure that the ordering documentation explicitly lists the AD7884APZ variant to guarantee compliance with the specified -40°C to +85°C operating range and performance characteristics.

Selection Notes

Select the AD7884APZ when a 16-bit resolution and 166 kSPS throughput are required for systems needing low power consumption relative to speed. This component is suitable for applications demanding a parallel interface and internal sample-and-hold functionality. Consider the ±5 V supply requirement and the need for an external 3 V reference source when designing the power and reference circuits for the system.

Part Context

The AD7884 is part of Analog Devices' LC2MOS family of high-speed sampling ADCs. It shares architectural similarities with the AD7885, which offers a byte-read structure instead of a full 16-bit parallel read. Both devices utilize the same two-pass flash technique and internal oscillator, differing primarily in their digital output interface and pin count configurations.

Replacement Considerations

The AD7885AAP is functionally equivalent to the AD7884APZ but features an 8-bit byte-read structure rather than a 16-bit parallel output. Designers must account for the different pinout and control logic (HBEN signal) when substituting this part. Verify that the system software can handle the sequential byte reading mode if replacing the AD7884APZ with the AD7885AAP.