Analog Devices Inc. AD976ACRS

Overview

AD976ACRS from Analog Devices is a 16-bit, 200 kSPS BiCMOS analog-to-digital converter with ±10 V input range, internal 2.5 V reference, and parallel interface - designed for precision data acquisition in industrial instrumentation and automated test equipment requiring high DC accuracy and low power (100 mW max).

For engineers reviewing the AD976ACRS datasheet, AD976ACRS pinout, AD976ACRS application, or AD976ACRS equivalent, this page delivers verified specifications, package mapping to 28-lead SSOP (RS-28), functional pin roles, real-world use cases, and two validated alternative parts for design flexibility.

Technical Context

The AD976ACRS implements a successive-approximation architecture using a laser-calibrated on-chip capacitor array instead of resistor ladders, eliminating temperature-induced linearity drift. It integrates factory-trimmed offset/gain correction coefficients stored in thin-film ROM for real-time error compensation during conversion.

It supports both internal and external 2.5 V reference operation, features an on-chip clock, and uses Binary Two's Complement output coding with byte-select capability for 16-bit parallel data transfer. Input bandwidth is 2.7 MHz, and full-power bandwidth is 1 MHz (AD976A grade).

Key Specifications

Pinout & Package

AD976ACRS is housed in a 28-lead Shrink Small Outline Package (SSOP), designated RS-28, with 0.65 mm lead pitch and exposed pad-less construction per Analog Devices' ordering guide.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8860IDRCT and AD7606BSTZ, the AD976ACRS offers unique value in legacy 5 V parallel-bus systems requiring internal reference, minimal external components, and proven long-term stability in industrial environments - without sacrificing 16-bit resolution or 200 kSPS throughput.

Availability

AD976ACRS is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical diagnostic instrumentation, and power quality analyzers requiring stable component supply across extended temperature ranges and long production lifecycles.

Supply support for AD976ACRS 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 Wilmington, MA.

The AD976 family was engineered specifically for high-accuracy, single-supply data acquisition in industrial and instrumentation applications - emphasizing DC precision, low power, and integrated reference functionality over raw speed.

FAQ

What is the maximum sampling rate supported by the AD976ACRS?

The AD976ACRS supports a maximum throughput rate of 200 kSPS, corresponding to a complete conversion time of 5 µs. This is confirmed in the AD976A specification tables and timing diagrams (t7 + t8 = 5 µs), and applies across its full operating temperature range of –40°C to +85°C. The AD976ACRS achieves this rate using its internal clock and successive-approximation architecture without requiring external timing components.

Does the AD976ACRS include an internal voltage reference?

Yes, the AD976ACRS includes a factory-trimmed internal 2.5 V reference with ±0.02 V tolerance (2.48 V to 2.52 V), accessible at the REF pin. It can be used directly or overridden by an external 2.3–2.7 V reference. The internal reference eliminates the need for external reference ICs in many applications, and its stability is specified at ±7 ppm/°C for full-scale error drift.

What package type is used for the AD976ACRS?

The AD976ACRS is packaged in a 28-lead Shrink Small Outline Package (SSOP), designated RS-28 per Analog Devices' ordering guide. This package has a 0.65 mm lead pitch and is distinct from the larger SOIC (R-28) and PDIP (N-28B) variants. Pin compatibility is maintained across AD976/AD976A variants in the same package type, but RS-28 requires specific PCB footprint dimensions.

How does the BYTE pin affect data output on the AD976ACRS?

The BYTE pin configures the 16-bit parallel output format: when BYTE is LOW, D15–D0 appear on pins 6–22 in standard order (D15 = pin 6, D0 = pin 22); when BYTE is HIGH, the upper and lower bytes are swapped - D15–D8 appear on pins 15–22 and D7–D0 on pins 6–13. This allows direct interfacing with 8-bit microcontrollers without external demultiplexing logic.

What is the analog input impedance and capacitance of the AD976ACRS?

The AD976ACRS exhibits an analog input impedance of 13 kΩ and input capacitance of 22 pF, as specified for the AD976A grade in the "Analog Input" section of the datasheet. These values are critical for driving amplifier selection - low-impedance sources (<50 Ω) are recommended to maintain linearity and avoid settling errors, especially at full throughput rates.