Analog Devices Inc. AD976ABRZ

Overview

AD976ABRZ 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) from a single +5 V supply.

For engineers reviewing the AD976ABRZ datasheet, AD976ABRZ pinout, AD976ABRZ application, or AD976ABRZ equivalent, this page delivers verified specifications, package mapping to 28-lead SOIC (R-28), confirmed timing behavior (4.0 µs conversion time), and real-world application context for signal chain design and replacement selection.

Technical Context

The AD976ABRZ implements a successive-approximation ADC architecture using a laser-trimmed capacitor array instead of resistor ladders, eliminating temperature-induced linearity drift. It integrates on-chip calibration coefficients stored in thin-film resistors to correct capacitor mismatches 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. The analog input section includes ±25 V overvoltage protection and requires separate AGND1 (reference ground) and AGND2 (buffer ground) connections to maintain bipolar zero error ≤ ±10 mV.

Key Specifications

Pinout & Package

AD976ABRZ is housed in a 28-lead Small Outline Integrated Circuit (SOIC) package (package code R-28), 300 mil width, RoHS-compliant, with standard JEDEC MS-012AC footprint.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8860IDRCT and MAX11270ETJ+, the AD976ABRZ uniquely combines 200 kSPS parallel-output performance, ±10 V bipolar input, and self-contained 2.5 V reference in a mature SOIC package - making it irreplaceable in legacy industrial DAQ systems where timing determinism and minimal BOM count are mandatory.

Availability

AD976ABRZ is available at Aetrix Electronics and suitable for industrial process monitoring, automated test equipment, medical data acquisition, and scientific instrumentation requiring stable component supply across extended product lifecycles.

Supply support for AD976ABRZ 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, headquartered in Wilmington, MA.

The AD976ABRZ belongs to Analog Devices' legacy high-precision SAR ADC family, engineered for industrial and instrumentation applications demanding guaranteed DC accuracy, robustness against ESD and overvoltage, and long-term supply stability.

FAQ

What is the maximum sampling rate supported by the AD976ABRZ?

The AD976ABRZ supports a maximum throughput rate of 200 kSPS, corresponding to a minimum conversion time of 4.0 µs. This is specified for the AD976A grade under –40°C to +85°C, with VANA = VDIG = +5 V and internal reference enabled. The AD976ABRZ achieves this rate using its on-chip clock and parallel interface, with BUSY signaling used to synchronize data reads.

Does the AD976ABRZ require external reference circuitry?

No - the AD976ABRZ includes a factory-trimmed 2.5 V internal reference with ±0.02 V tolerance (2.48 V to 2.52 V), eliminating the need for external reference ICs in most applications. However, an external 2.3–2.7 V reference can be applied to the REF pin if improved long-term stability or temperature coefficient is required, as documented in the AD976ABRZ datasheet Section "REFERENCE".

How is the AD976ABRZ pinout configured for byte-wide data access?

The AD976ABRZ uses the BYTE pin to configure data bus output order: when BYTE = LOW, D15 (MSB) appears on Pin 6 and D0 (LSB) on Pin 22; when BYTE = HIGH, D15–D8 appear on Pins 15–22 and D7–D0 on Pins 6–13. This allows direct connection to 8-bit microcontrollers without external multiplexing, as defined in the AD976ABRZ Pin Function Descriptions table.

What ground separation strategy is required for optimal AD976ABRZ performance?

The AD976ABRZ mandates strict separation of three ground domains: AGND1 (reference ground for REF), AGND2 (buffer ground for CAP), and DGND (digital ground). These must be tied together at a single point near the device, with AGND1 serving as the analog signal return. Failure to isolate AGND1 from noisy DGND paths causes measurable bipolar zero error degradation beyond the specified ±10 mV limit.

Can the AD976ABRZ operate with a 3.3 V digital supply?

No - the AD976ABRZ requires VDIG between 4.75 V and 5.25 V for specified operation. Its digital outputs (VOH ≥ +4 V, VOL ≤ +0.4 V) and timing parameters (e.g., 83 ns bus access time) are characterized only at 5 V. Using 3.3 V violates absolute maximum ratings and will result in undefined logic states, timing violations, and potential damage to the internal digital circuitry.