Analog Devices Inc. AD976AANZ

Overview

AD976AANZ 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 input range, and parallel 16-bit binary two's complement 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 AD976AANZ datasheet, AD976AANZ pinout, AD976AANZ application, or AD976AANZ equivalent, this page delivers verified specifications, package mapping, functional context, and real-world selection guidance - all grounded in Analog Devices' Rev. D datasheet and ordering guide.

Technical Context

The AD976AANZ implements a switched-capacitor SAR architecture with on-chip laser-trimmed capacitor array calibration, eliminating external sample-and-hold circuitry. Its factory-calibrated linearity correction uses stored coefficients in thin-film resistors to correct capacitor mismatch errors across temperature.

It supports dual conversion control modes: R/C-triggered (CS tied low) or CS/R/C coordinated timing, with BUSY-synchronized data latching. The analog input features ±25 V overvoltage protection, 13 kΩ input impedance, and 22 pF capacitance - requiring a 200 Ω series resistor for full-scale ±10 V operation.

Key Specifications

Pinout & Package

AD976AANZ is packaged in a 28-lead plastic DIP (PDIP), 300 mil width, with through-hole mounting and standard JEDEC outline N-28B. Pin spacing is 0.1 inch, body width 0.3 inches, and lead count matches functional signal requirements without redundancy.

Key Features

Applications

Equivalent & Alternatives

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

Compared with AD976BN and ADS8860IDRCT, the AD976AANZ uniquely combines 200 kSPS parallel interfacing, integrated 2.5 V reference, and ±10 V bipolar input in a legacy-compatible PDIP package - making it optimal for drop-in upgrades in existing industrial DAQ hardware.

Availability

AD976AANZ is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, and medical instrumentation requiring stable component supply and long-term obsolescence management.

Supply support for AD976AANZ 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 AD976AANZ belongs to Analog Devices' precision SAR ADC product line, designed specifically for high-accuracy, medium-speed data acquisition in harsh industrial environments where reliability, DC accuracy, and ease of integration are paramount.

FAQ

What is the maximum sampling rate supported by the AD976AANZ?

The AD976AANZ supports a maximum throughput rate of 200 kSPS, corresponding to a minimum conversion cycle time of 5 µs. This is confirmed in the AD976A–SPECIFICATIONS table under "Throughput Rate" (200 kHz typical) and "Complete Cycle" (5 µs max). The timing diagram in Figure 2 shows BUSY low duration ≤4 µs, enabling sustained 200 kSPS operation when R/C pulses are spaced at 5 µs intervals. This rate applies across the full –40°C to +85°C temperature range with internal reference and nominal 5 V supplies.

Does the AD976AANZ require an external reference voltage?

No, the AD976AANZ does not require an external reference voltage because it integrates a factory-trimmed 2.5 V reference with ±20 mV initial tolerance and ±7 ppm/°C drift. The REF pin provides this voltage and can also accept an external 2.3 V to 2.7 V reference for improved accuracy. When using the internal reference, a 2.2 µF tantalum capacitor must be connected between REF and AGND1, and another between CAP and AGND2 - both specified in the Pin Function Descriptions and Figure 6 of the datasheet.

What package type is used for the AD976AANZ?

The AD976AANZ uses a 28-lead plastic DIP (PDIP) package, 300 mil wide, with JEDEC designation N-28B. This is explicitly stated in the Ordering Guide row for "AD976AAN" and confirmed in the "PIN CONFIGURATION" section showing top-view pinouts labeled for DIP, SOIC, and SSOP - with the "N" suffix denoting PDIP. The package has 0.1-inch lead pitch, through-hole mounting, and is RoHS-compliant per Analog Devices' packaging standards.

How is analog input protection implemented on the AD976AANZ?

The AD976AANZ implements ±25 V absolute maximum rating on the VIN pin, providing robust overvoltage protection beyond its ±10 V full-scale range. This is documented in the Absolute Maximum Ratings table. To maintain specified linearity, a 200 Ω series resistor must be placed between the signal source and VIN - as shown in Figures 5 and 6 - which limits fault current and interfaces with the internal 13 kΩ input impedance. The device also features separate AGND1 and AGND2 pins to isolate reference ground paths and reduce noise coupling.

Can the AD976AANZ interface directly with a microcontroller GPIO bus?

Yes, the AD976AANZ can interface directly with a microcontroller GPIO bus via its parallel 16-bit digital output. Its VOL ≤0.4 V (at 1.6 mA sink) and VOH ≥4.0 V (at 500 µA source) meet standard TTL/CMOS logic thresholds for 5 V systems. Bus access time is ≤83 ns, and timing is synchronized to the BUSY signal's rising edge - allowing simple GPIO bit-banging or dedicated parallel port use without FIFO or DMA overhead. The BYTE pin further enables flexible 8-bit or 16-bit read sequencing per system needs.