Analog Devices Inc. AD976AARZ-RL

Overview

AD976AARZ-RL from Analog Devices is a 16-bit, 200 kSPS BiCMOS successive-approximation analog-to-digital converter (ADC) with internal 2.5 V reference, on-chip clock, and high-speed parallel interface. It operates from a single +5 V supply, accepts ±10 V analog input, dissipates ≤100 mW, and targets precision data acquisition in industrial instrumentation and automated test equipment.

For engineers reviewing the AD976AARZ-RL datasheet, AD976AARZ-RL pinout, AD976AARZ-RL application, or AD976AARZ-RL equivalent, this page delivers verified specifications, package mapping to 28-lead SOIC (RW-28), functional pin roles, real-world use cases, and two validated alternative parts for design flexibility and supply continuity.

Technical Context

The AD976AARZ-RL implements a switched-capacitor SAR architecture with laser-trimmed scaling resistors and factory-calibrated capacitor-array matching, eliminating external sample/hold circuitry. Its internal calibration coefficients are stored in thin-film resistors acting as ROM and applied dynamically during conversion to correct offset, gain, and linearity errors.

It supports dual reference modes (internal 2.5 V or external 2.3–2.7 V), offers BYTE-selectable 16-bit parallel output (full-word or byte-swapped), and uses separate analog (AGND1/AGND2) and digital (DGND) ground planes to minimize noise coupling. Timing is controlled via R/C and CS inputs with BUSY-synchronized data latching.

Key Specifications

Pinout & Package

AD976AARZ-RL is housed in a 28-lead Small Outline Integrated Circuit (SOIC) package with RW-28 footprint (body width 7.5 mm, lead pitch 0.65 mm). This RoHS-compliant, surface-mount package supports automated assembly and meets JEDEC MS-012 standards.

Key Features

Applications

Equivalent & Alternatives

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

Compared with ADS8860IDRCT and MAX11902ETX+, the AD976AARZ-RL uniquely retains the industrial-standard ±10 V input, 5 V parallel interface, and internal reference in a mature SOIC package-making it irreplaceable for drop-in upgrades and legacy system maintenance where board layout and firmware cannot be modified.

Availability

AD976AARZ-RL is available at Aetrix Electronics and suitable for industrial data acquisition, automated test equipment, medical instrumentation, and energy metering reference designs requiring stable component supply across extended product lifecycles.

Supply support for AD976AARZ-RL 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, with design and manufacturing expertise spanning precision data converters, amplifiers, and RF solutions.

The AD976AARZ-RL belongs to Analog Devices' legacy high-accuracy SAR ADC family, engineered specifically for industrial and instrumentation applications demanding robust ±10 V input handling, single-supply operation, and factory-calibrated DC/AC performance without external support components.

FAQ

What is the maximum sampling rate supported by the AD976AARZ-RL?

The AD976AARZ-RL 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 (REV. D) under "Throughput Rate" with a typical value of 200 kHz across all grades. The timing diagram in Figure 2 shows BUSY low duration of 4.0 µs, enabling sustained 200 kSPS operation when R/C pulses are spaced at 5 µs intervals. The AD976AARZ-RL achieves this rate using its on-chip clock and calibrated SAR core without external timing components.

Does the AD976AARZ-RL require an external reference voltage?

No, the AD976AARZ-RL does not require an external reference voltage because it integrates a factory-trimmed 2.5 V internal reference with ±20 mV tolerance (2.48 V to 2.52 V) and drift of ±7 ppm/°C. The REF pin provides this voltage and can alternatively accept an external 2.3–2.7 V source if tighter accuracy or different scaling is needed. When using the internal reference, a 2.2 µF tantalum capacitor must be placed between REF and AGND1, and another between CAP and AGND2 - both specified in the Pin Function Descriptions section for the AD976AARZ-RL.

What package type is used for the AD976AARZ-RL?

The AD976AARZ-RL uses a 28-lead Small Outline Integrated Circuit (SOIC) package with RW-28 footprint - a 7.5 mm body width, 0.65 mm lead pitch variant compliant with JEDEC MS-012. This is explicitly stated in the Ordering Guide (REV. D) where "AD976AAR" maps to "28-Lead Small Outline Package" and "RW-28" package option. The RW-28 designation distinguishes it from standard R-28 (narrower body) and RS-28 (shrink SOIC), confirming its specific mechanical form factor and thermal characteristics (θJA = 72°C/W).

How is the parallel data bus configured on the AD976AARZ-RL?

The AD976AARZ-RL parallel data bus is configured via the BYTE pin: when BYTE is LOW, D15 (MSB) appears on Pin 6 and D0 (LSB) on Pin 22 for standard 16-bit output; when BYTE is HIGH, the byte order swaps - D15–D8 appear on Pins 15–22 and D7–D0 on Pins 6–13. This is defined in the Pin Function Descriptions (Pin 23) and illustrated in Figure 4. Data is valid after BUSY rises, and outputs enter high-impedance state when CS is HIGH or R/C is LOW - ensuring clean bus sharing in multi-peripheral systems using the AD976AARZ-RL.

What is the analog input impedance and capacitance of the AD976AARZ-RL?

The AD976AARZ-RL has an analog input impedance of 13 kΩ and input capacitance of 22 pF, as specified in the AD976A–SPECIFICATIONS table under "ANALOG INPUT" for all grades. These values apply when operating with the internal reference (Figure 6 configuration) and are critical for driving amplifier selection - the datasheet recommends low-output-impedance op amps to avoid settling errors. The 13 kΩ resistance is primarily from internal scaling resistors, and the 22 pF represents total capacitive loading seen at the VIN pin, directly impacting anti-alias filter design when using the AD976AARZ-RL in sampled-data systems.