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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc. AD7981HFZ

Name: AD7981HFZ
Brand: Analog Devices Inc.
SKU: AD7981HFZ
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: AD7981HFZ

Manufacturer:: Analog Devices Inc.

Category:: Analog to Digital Converters (ADC)

Package:: 10-CFlatPack

Datasheet:: AD7981HFZ.pdf

Description:: IC ADC 16BIT SAR 10CFLATPACK

Quantity:: RFQ Add To RFQ list

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Product details

Overview

AD7981HFZ from Analog Devices is a 16-bit, successive approximation register (SAR) analog-to-digital converter optimized for extreme-temperature operation in harsh environments. It delivers 600 kSPS throughput with ±2.5 LSB INL (max), 92 dB dynamic range (VREF = 5 V), and zero-latency architecture, enabling real-time precision digitization of sensor signals in downhole oil & gas instrumentation.

For engineers reviewing the AD7981HFZ datasheet, AD7981HFZ pinout, AD7981HFZ application, or AD7981HFZ equivalent, this page provides verified high-temperature ADC specifications, validated MSOP/FLATPACK package mapping, confirmed SPI-compatible serial interface behavior, and application-specific design meaning for avionics and scientific instrumentation use cases.

Technical Context

The AD7981HFZ implements a pseudo-differential SAR architecture with external reference input (2.4 V–5.1 V), sampling on the CNV rising edge and delivering conversion results immediately via a 16-bit straight-binary serial stream. Its zero-latency design eliminates pipeline delay, supporting deterministic timing-critical control loops.

It features dual-voltage operation: 2.5 V VDD for core analog/digital logic and independent 1.8 V–5 V VIO for flexible host interface compatibility. Monometallic wire-bonded 10-lead FLATPACK packaging supports full specification from −55°C to +210°C, qualified for 1000 hours at max temperature.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	16-bit with no missing codes - guarantees monotonicity and full code coverage across full temperature range.
Throughput	600 kSPS maximum - enables high-speed closed-loop feedback in turbine monitoring or seismic data acquisition.
INL / DNL	±2.5 LSB max INL, ±0.9 LSB max DNL - ensures <0.04% end-point linearity error for calibrated pressure transducer interfaces.
Dynamic Range	92 dB at VREF = 5 V - supports >15-bit effective resolution for low-amplitude vibration sensing in avionics.
Power @ 600 kSPS	4.65 mW total (2.25 mW VDD only) - allows battery-powered deployment in remote wellhead telemetry systems.
Temperature Range	−55°C to +210°C (FLATPACK) - meets MIL-STD-883 Class H requirements for embedded downhole electronics.
Reference Input	2.4 V to 5.1 V externally supplied - permits ratiometric measurement with high-stability voltage references like ADR4550.

Pinout & Package

AD7981HFZ is packaged in a 10-lead ceramic FLATPACK (F-10-2), measuring 0.255 inches × 0.255 inches, with monometallic wire bonding and qualified for 1000 hours at +210°C. This hermetic package ensures long-term reliability in high-pressure, high-temperature (HPHT) environments.

Pin/Terminal	Circuit Role	Design Meaning
1 REF	Analog reference input	Accepts 2.4 V–5.1 V external reference; requires local 10 µF decoupling for stable conversion accuracy.
2 VDD	Analog/digital core supply	2.375 V–2.625 V single supply; powers SAR core, internal logic, and reference buffer.
3 IN+	Pseudo-differential analog input	Voltage measured relative to IN−; 0 V to VREF range supports unipolar industrial sensor outputs.
4 IN−	Analog ground sense	Provides remote sensing point for analog ground return-critical for noise rejection in motor drive feedback.
5 GND	Power supply ground	Dedicated low-impedance return path for VDD and REF; must be isolated from digital ground per layout guidelines.
6 CNV	Conversion start & interface mode select	Rising edge initiates sampling; logic level at CNV edge selects ACS_EA or Chain mode for multi-ADC synchronization.
7 SDO	Serial data output	16-bit straight-binary output synchronized to SCK; tri-state controlled by CNV/SDI in ACS_EA mode.
8 SCK	Serial clock input	Accepts up to 100 MHz clock (VIO > 4.5 V); timing defines data valid window and acquisition alignment.
9 SDI	Serial data input / mode control	Configures interface mode (Chain vs. ACS_EA) on CNV edge; in Chain mode, enables daisy-chained readout.
10 VIO	Digital I/O interface supply	1.71 V–5.5 V independent rail-enables direct interfacing with 1.8 V FPGA, 3.3 V MCU, or 5 V legacy controllers.

Key Features

Feature	Design Value
Extreme temperature qualification	Specified performance from −55°C to +210°C in FLATPACK-enables deployment in turbine engine compartments without external cooling.
Zero-latency architecture	No pipeline delay; conversion result available immediately after CNV rising edge-essential for real-time overcurrent protection circuits.
SPI-/QSPI-/MICROWIRE-compatible interface	Supports 3-wire (CS-less) and 4-wire modes with busy indicator; eliminates need for additional GPIO lines in space-constrained modules.
Daisy-chain capability	SDI input routes prior ADC's SDO output through current device-reduces PCB routing complexity in multi-channel seismic sensor arrays.
Low power scaling	75 µW typical at 10 kSPS-extends battery life in wireless condition-monitoring nodes operating intermittently.

Applications

Downhole Drilling Instrumentation	Avionics Engine Monitoring
Use Scenario: Digitizing strain gauge and thermocouple outputs inside drill string telemetry tools exposed to 200°C ambient and high mechanical shock. IC Role / Device Role / Timing Role: Primary SAR ADC capturing high-fidelity sensor data at 500+ kSPS with deterministic latency for real-time formation evaluation. Use Value: FLATPACK hermetic sealing and −55°C to +210°C rating eliminate need for thermal shielding or active cooling, reducing tool diameter and weight.	Use Scenario: Measuring turbine inlet temperature and exhaust gas pressure in FADEC systems where EMI and thermal cycling exceed commercial-grade limits. IC Role / Device Role / Timing Role: High-accuracy analog front-end ADC interfacing with isolated signal conditioners and feeding flight-critical control algorithms. Use Value: ±2.5 LSB INL and 92 dB dynamic range ensure sub-0.1% measurement uncertainty under full MIL-STD-704E power bus transients.
Heavy Industrial Motor Control	Scientific High-Temperature Physics Sensors
Use Scenario: Closed-loop current and position feedback in induction motor drives operating inside furnace enclosures at sustained 150°C ambient. IC Role / Device Role / Timing Role: Real-time current sensing ADC synchronizing with PWM gate drivers via CNV-triggered sampling. Use Value: Zero-latency architecture and 290 ns acquisition time enable precise current reconstruction at 20 kHz switching frequencies.	Use Scenario: Capturing transient thermal neutron flux signals from borosilicate detectors in nuclear fusion test reactors with ambient temperatures up to 180°C. IC Role / Device Role / Timing Role: Low-noise, high-SFDR digitizer preserving weak pulse amplitude information amid intense gamma radiation-induced noise. Use Value: −102 dB THD and 104 dB SFDR suppress harmonic distortion from detector preamp stages, preserving pulse shape fidelity.

Downhole Drilling Instrumentation

Avionics Engine Monitoring

Use Scenario: Digitizing strain gauge and thermocouple outputs inside drill string telemetry tools exposed to 200°C ambient and high mechanical shock.

IC Role / Device Role / Timing Role: Primary SAR ADC capturing high-fidelity sensor data at 500+ kSPS with deterministic latency for real-time formation evaluation.

Use Value: FLATPACK hermetic sealing and −55°C to +210°C rating eliminate need for thermal shielding or active cooling, reducing tool diameter and weight.

Use Scenario: Measuring turbine inlet temperature and exhaust gas pressure in FADEC systems where EMI and thermal cycling exceed commercial-grade limits.

IC Role / Device Role / Timing Role: High-accuracy analog front-end ADC interfacing with isolated signal conditioners and feeding flight-critical control algorithms.

Use Value: ±2.5 LSB INL and 92 dB dynamic range ensure sub-0.1% measurement uncertainty under full MIL-STD-704E power bus transients.

Heavy Industrial Motor Control

Scientific High-Temperature Physics Sensors

Use Scenario: Closed-loop current and position feedback in induction motor drives operating inside furnace enclosures at sustained 150°C ambient.

IC Role / Device Role / Timing Role: Real-time current sensing ADC synchronizing with PWM gate drivers via CNV-triggered sampling.

Use Value: Zero-latency architecture and 290 ns acquisition time enable precise current reconstruction at 20 kHz switching frequencies.

Use Scenario: Capturing transient thermal neutron flux signals from borosilicate detectors in nuclear fusion test reactors with ambient temperatures up to 180°C.

IC Role / Device Role / Timing Role: Low-noise, high-SFDR digitizer preserving weak pulse amplitude information amid intense gamma radiation-induced noise.

Use Value: −102 dB THD and 104 dB SFDR suppress harmonic distortion from detector preamp stages, preserving pulse shape fidelity.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-temperature SAR ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
AD7980HFZ	16-bit, 1 MSPS, but rated only to +175°C (MSOP) and lacks FLATPACK option; INL ±3.5 LSB max.	Not suitable for >175°C downhole or reactor-core deployments; acceptable for avionics hot boxes with margin.	Select AD7981HFZ when +210°C operation or FLATPACK hermeticity is required; AD7980HFZ offers higher speed where temperature ceiling permits.
MAX1300BEAP+	16-bit, 100 kSPS, −40°C to +125°C industrial grade; SPI-only interface, no daisy-chain support.	Limited to non-extreme environments; lacks zero-latency and high-temp qualification needed for oil/gas or aerospace.	AD7981HFZ is mandatory for HPHT applications; MAX1300BEAP+ may serve as cost-optimized alternative only in benign-temperature industrial PLCs.

Compared with AD7980HFZ and MAX1300BEAP+, the AD7981HFZ uniquely combines +210°C FLATPACK qualification, 600 kSPS throughput, and daisy-chain capability-making it the sole option for multi-sensor, ultra-high-temperature telemetry where reliability cannot be compromised.

Availability

AD7981HFZ is available at Aetrix Electronics and suitable for oil & gas exploration, avionics engine control, heavy industrial motor drives, and scientific high-temperature physics instrumentation requiring stable component supply across extended lifecycle commitments.

Supply support for AD7981HFZ 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 Norwood, MA.

The AD7981HFZ belongs to Analog Devices' high-temperature product series, engineered specifically for mission-critical sensing in environments where standard ICs fail-targeting downhole, aerospace, and nuclear instrumentation markets.

FAQ

What is the maximum operating temperature for AD7981HFZ?

The AD7981HFZ is fully specified from −55°C to +210°C in its 10-lead ceramic FLATPACK package and qualified for 1000 hours of continuous operation at +210°C. This exceeds the rating of most commercial and automotive-grade ADCs and meets stringent requirements for downhole drilling tools and reactor-core sensors.

Does AD7981HFZ support daisy-chaining with other ADCs?

Yes, the AD7981HFZ supports daisy-chain configuration via its SDI input and SDO output. When SDI is held low during the CNV rising edge, the device enters Chain mode-allowing multiple AD7981HFZ units to share a single SDO line and reduce interconnect count in multi-channel high-temperature sensor arrays.

What reference voltage range is supported by AD7981HFZ?

The AD7981HFZ accepts an external reference voltage (REF pin) from 2.4 V to 5.1 V. This wide range enables ratiometric measurements with precision references such as the ADR4550 (5.0 V) or ADR441 (2.5 V), maintaining full 16-bit performance across all supported VREF values.

Is AD7981HFZ compatible with 1.8 V microcontrollers?

Yes, AD7981HFZ features a separate VIO supply (1.71 V–5.5 V) that independently powers its digital interface. When VIO = 1.8 V, the device maintains full SPI/QSPI/MICROWIRE compatibility-including proper logic thresholds and timing margins-enabling direct connection to low-voltage FPGAs or ARM Cortex-M0+ MCUs.

What is the significance of zero-latency architecture in AD7981HFZ?

Zero-latency means the AD7981HFZ delivers conversion results immediately after sampling completes-no pipeline delay or additional clock cycles required. This enables deterministic, cycle-accurate sampling in real-time protection systems, such as overcurrent detection in motor drives where response time must be <1 µs.

AD7981HFZ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc.

Series:: PulSAR®

Package/Case:: 10-CFlatPack

Packaging:: Tube

Product Status:: Active

Number of Bits:: 16

Sampling Rate (Per Second):: 600k

Number of Inputs:: 1

Input Type:: Pseudo-Differential

Data Interface:: SPI, DSP

Configuration:: S/H-ADC

Ratio - S/H:ADC:: 1:1

Number of A/D Converters:: 1

Architecture:: SAR

Reference Type:: External

Voltage - Supply, Analog:: 2.375V ~ 2.625V

Voltage - Supply, Digital:: 2.375V ~ 2.625V

Features:: -

Operating Temperature:: -55°C ~ 210°C

Supplier Device Package:: 10-CFlatPack

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

AD7981HFZ FAQ

1.How can I place an order for AD7981HFZ through Aetrix?

Please submit a Request for Quotation (RFQ) for AD7981HFZ on Aetrix. Our sales agent will provide a competitive quotation and guide you through the order confirmation once you accept the terms.

2.Are the price and stock information for AD7981HFZ reliable?

The price and inventory of AD7981HFZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7981HFZ is usually 5 days.

3.What payment methods are accepted for AD7981HFZ?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7981HFZ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for AD7981HFZ?

AD7981HFZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your AD7981HFZ order is processed, you will receive an email with the shipment details and tracking number.

Note: Tracking information may take up to 24 hours to appear. Express delivery typically takes 3–5 business days.

5.How can I obtain technical support or documentation for AD7981HFZ?

For technical support, including AD7981HFZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7981HFZ requirements.

6.How does Aetrix verify that AD7981HFZ is sourced from the original manufacturer or authorized distributors?

All AD7981HFZ products on Aetrix are procured from qualified distributors and authorized channels. Our dedicated quality assurance team conducts strict verification, including traceability checks and, if necessary, third-party testing. This ensures that AD7981HFZ meets industry standards.

7.What is the process for return or replacement of AD7981HFZ?

All AD7981HFZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7981HFZ, returns or replacements are accepted under the following conditions:

1.Quantity discrepancies, incorrect items, or visible external defects (such as breakage or corrosion), acknowledged by Aetrix.

2.The issue is reported within 90 days of delivery.

3.The AD7981HFZ part is unused and in its original packaging.

Return procedure for AD7981HFZ:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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