Analog Devices Inc. AD7884AP-REEL

Overview

AD7884AP-REEL from Analog Devices is a 16-bit monolithic sampling analog-to-digital converter (ADC) with internal sample-and-hold, two-pass flash architecture, ±5 V or ±3 V input ranges, 5.3 µs conversion time, and 166 kSPS throughput. It operates from ±5 V supplies with a 3 V reference and delivers 84 dB SNR in ±5 V input mode - used in high-speed data acquisition systems requiring precision timing and low-latency digitization.

For engineers reviewing the AD7884AP-REEL datasheet, AD7884AP-REEL pinout, AD7884AP-REEL application, or AD7884AP-REEL equivalent, key selection considerations include its 16-bit parallel output structure, bipolar zero error of ±0.15% FSR max, integral nonlinearity of ±0.0075% FSR max, and compatibility with microprocessor bus interfaces via CS/RD control logic.

Technical Context

The AD7884AP-REEL implements a two-pass flash ADC architecture: first pass captures 9 MSBs using a 9-bit ADC and 16-bit DAC, second pass digitizes the residue error amplified by an on-chip residue amplifier. Conversion is initiated asynchronously by CONVST, with BUSY signaling completion.

It supports dual analog input ranges (±5 V or ±3 V) via dedicated force/sense pins (±5VINF/±5VINS, ±3VINF/±3VINS), uses twos complement output coding, and features an internal oscillator eliminating external clock dependency. Power supply rejection ratio is 86 dB typ for both VDD and VSS.

Key Specifications

Pinout & Package

The AD7884AP-REEL is packaged in a 44-lead plastic leaded chip carrier (PLCC), designated P-44A per Analog Devices' ordering guide. Pin 1 is marked by a corner notch; all pins are surface-mount compatible with standard PLCC footprint.

Key Features

Applications

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-speed 16-bit ADC applications.

Compared with AD7884AQ and AD7885AAP, the AD7884AP-REEL provides native 16-bit parallel output in a surface-mount PLCC package optimized for automated assembly and thermal performance in high-density industrial PCBs.

Availability

AD7884AP-REEL is available at Aetrix Electronics and suitable for automatic test equipment, medical instrumentation, and industrial control applications requiring stable component supply, long-term obsolescence management, and traceable sourcing.

Supply support for AD7884AP-REEL 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, Inc. is a global leader in high-performance analog, mixed-signal, and digital signal processing semiconductors, headquartered in Norwood, MA.

The AD7884 product line was designed for high-speed, high-accuracy data acquisition in demanding industrial and instrumentation environments where resolution, speed, and dc precision must coexist without calibration.

FAQ

What is the maximum sampling rate supported by the AD7884AP-REEL?

The AD7884AP-REEL supports a maximum throughput rate of 166 kSPS, enabled by overlapping acquisition and conversion phases. This is achieved with a fixed 5.3 µs conversion time and 2.5 µs acquisition time, resulting in a minimum inter-sample interval of 6.02 µs. The rate is independent of external clocking due to the internal oscillator.

Does the AD7884AP-REEL require an external reference voltage?

No - the AD7884AP-REEL requires a 3 V reference applied to VREF+S/VREF+F, but it does not generate that reference internally. A precision 3 V source such as the AD780, buffered by a low-noise op amp (e.g., AD845), is required. The device's internal resistor network is factory-trimmed to track this reference, ensuring gain stability.

How is the analog input range selected on the AD7884AP-REEL?

The analog input range (±5 V or ±3 V) is selected by hardware pin configuration: for ±5 V operation, ±5VINF and ±5VINS are active while ±3V pins are tied to AGND; for ±3 V operation, ±3VINF and ±3VINS are active and ±5V pins are grounded. No register writes or software control is involved - it is strictly a static pin-strapping function.

What is the purpose of the AGNDS and AGNDF pins on the AD7884AP-REEL?

AGNDS (analog ground sense) and AGNDF (analog ground force) form a Kelvin connection for the 9-bit ADC's ground return path. They must be driven by a low-offset, low-noise buffer amplifier (e.g., AD817) referenced to system AGND. Direct tying degrades INL, bipolar zero, and gain error - though SNR and THD remain largely unaffected.

Can the AD7884AP-REEL interface directly with a 3.3 V microcontroller bus?

No - the AD7884AP-REEL logic inputs (CS, RD, CONVST) require VDD = +5 V ±5%, and its digital outputs (DB0–DB15, BUSY) swing from 0 V to VDD (~5 V). Interfacing with a 3.3 V controller requires level-shifting circuitry or a 5 V-tolerant I/O interface; direct connection risks damage or unreliable logic levels.