Analog Devices Inc. AD976BRZ

Overview

AD976BRZ from Analog Devices is a 16-bit, 100 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 test equipment requiring high DC accuracy and low power.

For engineers reviewing the AD976BRZ datasheet, AD976BRZ pinout, AD976BRZ application, or AD976BRZ equivalent, this page delivers verified specifications, validated package mapping (SOIC-28), confirmed pin functions, and real-world timing behavior - all grounded in Analog Devices' Rev. D datasheet and ordering guide.

Technical Context

The AD976BRZ implements a successive-approximation architecture using a laser-trimmed capacitor array instead of resistor ladders, eliminating temperature-induced linearity drift. It integrates factory-calibrated offset/gain correction coefficients stored in on-chip thin-film resistors acting as ROM.

It supports dual conversion control modes: R/C-triggered (CS tied low) or CS-triggered (R/C held high), with BUSY-synchronized data valid timing. The device operates from a single 5 V supply, draws 14 mA total (11 mA analog + 3 mA digital), and dissipates ≤100 mW.

Key Specifications

Pinout & Package

AD976BRZ is housed in a 28-lead Small Outline IC (SOIC) package (package code R-28), 300 mil width, with gull-wing leads and 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 AD976BRZ uniquely retains a 5 V-compatible parallel interface, internal reference, and SOIC-28 package - making it irreplaceable in legacy industrial controllers where bus timing, supply voltage, and PCB layout are fixed.

Availability

AD976BRZ is available at Aetrix Electronics and suitable for industrial data loggers, automated test equipment, medical patient monitors, and power quality analyzers requiring stable component supply and long-term obsolescence management.

Supply support for AD976BRZ 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 AD976BRZ belongs to Analog Devices' precision SAR ADC product line, engineered for industrial, medical, and test instrumentation where DC accuracy, long-term stability, and single-supply simplicity outweigh ultra-high speed or ultra-low power requirements.

FAQ

What is the maximum sampling rate supported by the AD976BRZ?

The AD976BRZ supports a maximum throughput rate of 100 kSPS, corresponding to a fixed 10 µs conversion time per sample. This is specified for all grade versions (A/B/C) across the full operating temperature range of –40°C to +85°C and is guaranteed with internal reference enabled and VANA = VDIG = 5 V ±5%. The AD976BRZ does not support the 200 kSPS rate - that is exclusive to the AD976A variant.

Does the AD976BRZ require an external reference voltage?

No, the AD976BRZ includes a factory-trimmed internal 2.5 V reference (2.48 V to 2.52 V) that meets all AC and DC specifications without external components. An external reference between 2.3 V and 2.7 V may be applied to REF to improve system-level accuracy or match other signal chain elements, but it is optional - the AD976BRZ achieves ±0.5% full-scale error and ±7 ppm/°C drift using its internal reference alone.

How is the AD976BRZ interfaced to a microcontroller with an 8-bit data bus?

The AD976BRZ supports byte-mode operation via the BYTE pin: when BYTE = HIGH, D15–D8 appear on pins 15–22 and D7–D0 on pins 6–13, enabling sequential 8-bit reads. Combined with CS and BUSY handshaking, this allows direct connection to 8-bit MCUs like the 8051 or PIC18 without glue logic. Data is output in binary two's complement format, and BUSY rising edge indicates valid data.

What are the absolute maximum ratings for analog input voltage on the AD976BRZ?

The AD976BRZ analog input (VIN) has an absolute maximum rating of ±25 V - meaning it can withstand indefinite short-circuit or transient overvoltage events up to that level without damage. This rating applies regardless of power supply state and is independent of the ±10 V operational input range. However, sustained operation above ±10 V will cause clipping and invalid conversions; the ±25 V limit is purely for fault robustness.

Is the AD976BRZ RoHS compliant and lead-free?

Yes, the AD976BRZ is RoHS compliant and lead-free. Per Analog Devices' official product change notices and packaging documentation, the SOIC-28 (R-28) package variant carries matte tin lead finish and conforms to EU RoHS Directive 2011/65/EU and China RoHS. The device is also qualified for moisture sensitivity level (MSL) 3 and supports standard reflow profiles per J-STD-020.