Analog Devices Inc. AD976BRSZ-RL7

Overview

AD976BRSZ-RL7 from Analog Devices is a 16-bit, 100 kSPS BiCMOS successive-approximation analog-to-digital converter with ±10 V input range, internal 2.5 V reference, and parallel 16-bit twos-complement interface - used in precision industrial data acquisition systems requiring high DC accuracy and low power.

For engineers reviewing the AD976BRSZ-RL7 datasheet, AD976BRSZ-RL7 pinout, AD976BRSZ-RL7 application, or AD976BRSZ-RL7 equivalent, this page delivers verified specifications, package mapping to 28-lead SSOP, functional pin roles, real-world use cases, and two validated alternative parts for design-in flexibility.

Technical Context

The AD976BRSZ-RL7 implements a switched-capacitor SAR architecture with on-chip laser-trimmed capacitor array calibration, eliminating external sample-and-hold circuitry. It uses factory-stored thin-film resistor coefficients to correct capacitor mismatches in real time during conversion.

It supports dual reference modes (internal 2.5 V or external 2.3–2.7 V), operates from a single 5 V supply (±5%), and features independent analog (VANA/AGND1/AGND2) and digital (VDIG/DGND) power domains to minimize noise coupling - critical for maintaining 85 dB S/(N+D) at 100 kHz throughput.

Key Specifications

Pinout & Package

AD976BRSZ-RL7 is housed in a 28-lead Shrink Small Outline Package (SSOP), 5.6 mm × 13.9 mm body, 0.635 mm pitch, RoHS-compliant, tape-and-reel format (RL7 suffix).

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD976BRSZ-RL7, AD976ARSZ-RL7 trades 2 LSB INL and 2 dB S/(N+D) for cost reduction, while ADS8860IDRCT offers 10× speed at the expense of parallel interface simplicity, internal reference, and 5 V compatibility - making AD976BRSZ-RL7 optimal for legacy industrial designs prioritizing plug-and-play integration and thermal stability.

Availability

AD976BRSZ-RL7 is available at Aetrix Electronics and suitable for industrial process monitoring, test & measurement instrumentation, medical diagnostics, and energy metering applications requiring stable component supply across long product lifecycles.

Supply support for AD976BRSZ-RL7 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, founded in 1965 and headquartered in Wilmington, MA.

The AD976 family was designed specifically for high-accuracy, low-power industrial data acquisition - delivering calibrated 16-bit performance from a single 5 V supply with integrated reference and parallel interface to simplify system integration.

FAQ

What is the maximum sampling rate supported by the AD976BRSZ-RL7?

The AD976BRSZ-RL7 supports a maximum throughput rate of 100 kSPS, corresponding to a complete conversion cycle time of 10 µs. This is confirmed in the AD976 specification table under "THROUGHPUT SPEED" for B-grade parts, and applies across the full –40°C to +85°C operating range with internal reference enabled.

Does the AD976BRSZ-RL7 require an external reference voltage?

No, the AD976BRSZ-RL7 includes a factory-trimmed internal 2.5 V reference (2.48 V to 2.52 V) that is fully specified for linearity and drift. An external reference (2.3 V to 2.7 V) may be used to override it, but is not required - enabling simpler, lower-cost designs where the internal reference's ±0.5% full-scale error and ±7 ppm/°C drift are acceptable.

How is the AD976BRSZ-RL7 calibrated for linearity errors?

The AD976BRSZ-RL7 uses a laser-trimmed on-chip capacitor array with factory-programmed calibration coefficients stored in thin-film resistors acting as ROM. During each conversion, these coefficients dynamically adjust the charge redistribution process to correct for capacitor mismatch - achieving ±2 LSB integral nonlinearity without user intervention.

What are the power supply requirements for the AD976BRSZ-RL7?

The AD976BRSZ-RL7 requires two separate 5 V supplies: VANA (analog, 4.75–5.25 V, 11 mA typical) and VDIG (digital, 4.75–5.25 V, 3 mA typical). These must be independently decoupled and routed to minimize noise coupling - violating this separation degrades the specified 85 dB S/(N+D) and increases INL error beyond ±2 LSB.

Can the AD976BRSZ-RL7 interface directly with a microcontroller without level-shifting?

Yes - the AD976BRSZ-RL7's digital outputs (D15–D0, BUSY, etc.) are TTL/CMOS-compatible with VDIG = 5 V: VOH ≥ 4.0 V (ISOURCE = 500 µA), VOL ≤ 0.4 V (ISINK = 1.6 mA). It interfaces directly with 5 V microcontrollers such as the ADSP-BF533 or STM32F4 without level-shifting, provided proper timing margins (e.g., 83 ns bus access time) are observed.