Analog Devices Inc. AD976ACR

Overview

AD976ACR from Analog Devices is a 16-bit, 200 kSPS BiCMOS successive-approximation analog-to-digital converter (ADC) with internal 2.5 V reference, ±10 V bipolar input range, and parallel 16-bit twos-complement output interface. It operates from a single 5 V supply, dissipates ≤100 mW, and targets precision data acquisition in industrial instrumentation and automated test equipment.

For engineers reviewing the AD976ACR datasheet, AD976ACR pinout, AD976ACR application, or AD976ACR equivalent, this page delivers verified specifications, package mapping to 28-lead SOIC (R-28), functional pin roles, real-world use cases, and two validated alternative parts for design flexibility and supply continuity.

Technical Context

The AD976ACR implements a switched-capacitor SAR architecture with on-chip laser-trimmed capacitor array calibration, eliminating external sample-and-hold circuitry and minimizing temperature-induced linearity drift. Its factory-calibrated offset, gain, and INL errors ensure ≤±3 LSB integral nonlinearity across –40°C to +85°C.

It supports dual reference modes: internal 2.5 V ±0.02 V reference (1 µA source current) or external reference (2.3 V to 2.7 V, 100 µA sink). The high-speed parallel interface features 83 ns bus access time, BYTE-selectable 16-bit or split-byte output, and BUSY-synchronized data latching.

Key Specifications

Pinout & Package

AD976ACR is housed in a 28-lead Small Outline Integrated Circuit (SOIC) package (package code R-28), 7.6 mm × 17.9 mm body, 1.27 mm pitch, RoHS-compliant.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8860IRGET and MAX1190ECM+, the AD976ACR uniquely combines 200 kSPS parallel throughput, integrated ±10 V input scaling, and internal 2.5 V reference in a legacy SOIC-28 package-making it irreplaceable for retrofitting or maintaining existing industrial DAQ hardware.

Availability

AD976ACR is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, and medical data acquisition requiring stable component supply and long-term obsolescence management.

Supply support for AD976ACR 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 semiconductors, serving industrial, automotive, communications, and healthcare markets since 1965.

The AD976 family was designed as a complete, single-supply 16-bit data acquisition solution for industrial instrumentation-integrating ADC core, reference, clock, and parallel interface to reduce system-level design effort and board area.

FAQ

What is the maximum sampling rate supported by the AD976ACR?

The AD976ACR supports a maximum throughput rate of 200 kSPS, corresponding to a 5 µs conversion cycle time. This is confirmed in the AD976A specification tables and ordering guide, where AD976ACR is explicitly rated for 200 kSPS under –40°C to +85°C conditions with internal reference and 5 V supplies. The AD976ACR achieves this via optimized SAR timing and on-chip clock generation.

Does the AD976ACR include an internal voltage reference?

Yes, the AD976ACR includes a factory-trimmed internal 2.5 V reference with ±0.02 V tolerance (2.48 V to 2.52 V) and 1 µA source capability. This reference is accessible at the REF pin and can be overridden by an external 2.3 V–2.7 V reference. The internal reference eliminates the need for external reference ICs in many applications, as documented in the AD976A specifications and functional description sections.

What package type is used for the AD976ACR?

The AD976ACR uses a 28-lead Small Outline Integrated Circuit (SOIC) package, designated R-28 in the Analog Devices ordering guide. This surface-mount package measures 7.6 mm × 17.9 mm with 1.27 mm lead pitch and is RoHS-compliant. Pin configuration matches the standard AD976/AD976A SOIC layout shown in the datasheet's pin diagram and function descriptions.

Can the AD976ACR operate with a single 5 V supply?

Yes, the AD976ACR operates from a single 5 V supply applied to both VANA and VDIG pins, with specified performance over 4.75 V to 5.25 V. Total power dissipation remains ≤100 mW, with analog supply current (IANA) ≤11 mA and digital supply current (IDIG) ≤3.0 mA. This single-supply operation is a core feature highlighted in the General Description and Product Highlights sections of the datasheet.

What is the analog input voltage range of the AD976ACR?

The AD976ACR has a nominal analog input range of ±10 V, supporting bipolar signal acquisition without external level-shifting. This range is derived from the internal 2.5 V reference scaled by on-chip resistor networks, yielding ±4×VREF. Input impedance is 13 kΩ with 22 pF capacitance, and absolute maximum rating is ±25 V-enabling robust operation in noisy industrial environments as specified in the Absolute Maximum Ratings and Analog Inputs sections.