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Analog Devices Inc. AD7981HRMZ
- Part No.:
- AD7981HRMZ
- Manufacturer:
- Analog Devices Inc.
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
AD7981HRMZ.pdf
- Description:
- IC ADC 16BIT SAR 10MSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,881
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Product details
Overview
AD7981HRMZ 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, 92 dB dynamic range (VREF = 5 V), and zero-latency architecture, serving as the primary high-accuracy digitizer in downhole oil/gas sensor signal chains.
For engineers reviewing the AD7981HRMZ datasheet, AD7981HRMZ pinout, AD7981HRMZ application, or AD7981HRMZ equivalent, this page provides verified package mapping (10-lead MSOP), confirmed high-temp performance specs (−55°C to +175°C), interface timing constraints, and validated alternative options for avionics and industrial instrumentation designs.
Technical Context
The AD7981HRMZ employs a pseudo-differential input architecture with independent IN+ and IN− terminals, sampling on the rising edge of CNV and supporting external reference voltages from 2.4 V to 5.1 V. Its zero-latency SAR core eliminates pipeline delay, enabling immediate data availability after conversion completion.
It features a SPI-/QSPI-/MICROWIRE-/DSP-compatible serial interface with dual operational modes: ACSEA mode (using CNV or SDI as chip select) and daisy-chain mode (SDI-driven multi-ADC cascading). The separate VIO supply (1.71 V to 5.5 V) ensures compatibility with 1.8 V, 2.5 V, 3 V, or 5 V logic systems without level-shifting.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit with no missing codes - guarantees monotonicity and full code coverage across −55°C to +175°C. |
| Throughput | 600 kSPS maximum - supports real-time capture of fast transients in high-speed sensor monitoring. |
| INL / DNL | ±2.5 LSB max / ±0.9 LSB max at VREF = 5 V - enables <1 LSB error budget allocation in precision measurement systems. |
| Dynamic Range | 92 dB at VREF = 5 V - supports >15-bit effective resolution for low-noise DC and AC signal acquisition. |
| Power Dissipation | 4.65 mW typical at 600 kSPS (total) - allows thermally constrained deployment in sealed high-temp enclosures. |
| Reference Range | 2.4 V to 5.1 V - permits flexible scaling for varying sensor output ranges while maintaining SNR > 89 dB. |
| Temperature Range | −55°C to +175°C (MSOP) - qualified for 1000 hours continuous operation at max temperature per AEC-Q200-aligned stress testing. |
Pinout & Package
AD7981HRMZ is packaged in a 10-lead monometallic wire-bonded MSOP (3 mm × 3 mm), rated for operation from −55°C to +175°C. The package uses robust internal construction including ceramic substrate and gold-alloy bonding wires suitable for thermal cycling in downhole and avionics applications.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 REF | Reference Input Voltage | Accepts 2.4 V–5.1 V external reference; decoupling with 10 µF capacitor required for stable ADC accuracy. |
| 2 VDD | Analog Power Supply | 2.375 V–2.625 V single supply; powers core SAR and analog front-end; linearly scales with throughput. |
| 3 IN+ | Analog Input Positive | Pseudo-differential input referenced to IN−; accepts 0 V to VREF range with 10 MHz −3 dB bandwidth. |
| 4 IN− | Analog Input Ground Sense | Remote sense return path for IN+; connects to local analog ground plane to reject common-mode noise. |
| 5 GND | Power Supply Ground | Dedicated analog ground return; must be star-connected to minimize digital switching noise coupling. |
| 6 CNV | Conversion Initiate Input | Rising edge triggers sample-and-hold; selects interface mode (ACSEA or chain); acts as busy indicator enable. |
| 7 SDO | Serial Data Output | 16-bit straight-binary output synchronized to SCK; tri-state controlled by CNV/SDI in ACSEA mode. |
| 8 SCK | Serial Clock Input | Drives data shift-out; minimum period 10.5 ns (VIO > 4.5 V); supports daisy-chain and CS-based protocols. |
| 9 SDI | Serial Data Input | Selects interface mode on CNV rising edge (high = ACSEA, low = chain); used for cascaded data injection. |
| 10 VIO | Digital I/O Power | Independent 1.71 V–5.5 V supply for logic interface; isolates digital noise from analog section. |
Key Features
| Feature | Design Value |
|---|---|
| Extreme temperature qualification | Rated −55°C to +175°C (MSOP), qualified for 1000 hrs at max temp - enables deployment in downhole drill collars and jet engine controllers. |
| Zero-latency SAR architecture | No pipeline delay; conversion result available immediately after tCONV (≤1200 ns) - critical for closed-loop control timing budgets. |
| Flexible reference interface | VREF independent of VDD (2.4 V–5.1 V), with 330 µA load current at 600 kSPS - simplifies reference buffer selection and power partitioning. |
| Dual serial interface modes | ACSEA (CS-selectable) and daisy-chain (SDI-cascaded) - reduces PCB routing complexity in multi-channel sensor arrays. |
| Low-power scalable operation | 75 µW at 10 kSPS; energy per conversion = 7.75 nJ - extends battery life in remote wireless telemetry nodes. |
Applications
| Downhole Drilling Sensors | Avionics Flight Control Units |
|---|---|
Use Scenario: Real-time pressure, temperature, and vibration sensing inside oil/gas wellbores at >150°C ambient. IC Role / Device Role / Timing Role: Primary high-accuracy digitizer capturing conditioned analog outputs from piezoresistive and RTD sensors. Use Value: Maintains ±2.5 LSB INL and 92 dB dynamic range across −55°C to +175°C, eliminating recalibration drift in extended deployments. |
Use Scenario: Monitoring hydraulic actuator feedback and inertial measurement unit (IMU) signals in aircraft flight control electronics. IC Role / Device Role / Timing Role: High-reliability ADC interfacing with isolated analog front-ends in DO-160G-compliant avionics modules. Use Value: Zero-latency output and daisy-chain capability reduce FPGA resource usage and simplify synchronization across multiple sensor channels. |
| Heavy Industrial Motor Drives | High-Temp Scientific Instrumentation |
Use Scenario: Current and voltage sensing in variable-frequency drives operating near furnace exhaust ducts or smelting equipment. IC Role / Device Role / Timing Role: Isolated analog input digitization stage feeding motor control DSPs with deterministic latency. Use Value: 600 kSPS throughput and 10 MHz input bandwidth support high-fidelity current loop reconstruction for field-oriented control. |
Use Scenario: Signal acquisition in vacuum chamber diagnostics, plasma monitoring, and geothermal probe systems exposed to sustained elevated temperatures. IC Role / Device Role / Timing Role: Precision digitizer for low-drift, low-noise amplifier outputs in calibrated lab-grade measurement hardware. Use Value: 91 dB SNR at 1 kHz and oversampled dynamic range of 110 dB (OSR = 256) enable sub-microvolt resolution in DC-coupled measurements. |
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 |
|---|---|---|---|
| AD7982HRMZ | 18-bit resolution, same 600 kSPS rate and −55°C to +175°C rating; higher power (5.8 mW at 600 kSPS) and larger INL (±3.5 LSB). | Better resolution for ultra-low-drift metrology; less suitable for space-constrained layouts due to higher thermal dissipation. | Select AD7982HRMZ only when 18-bit ENOB is required and board-level thermal management accommodates +25% power increase. |
| MAX1300BEAP+ | 16-bit, 250 kSPS, −40°C to +125°C; SPI-only interface, no daisy-chain mode; lower power (1.2 mW at 250 kSPS). | Limited to commercial/industrial grade environments; lacks high-temp qualification and zero-latency timing guarantee. | Choose MAX1300BEAP+ for cost-sensitive, non-extreme-temp applications where throughput and temperature margin are relaxed. |
Compared with AD7981HRMZ, AD7982HRMZ trades higher resolution for increased power and reduced accuracy tolerance, while MAX1300BEAP+ sacrifices temperature range and interface flexibility for lower cost and power - making AD7981HRMZ the optimal balance for mission-critical high-temp SAR conversion.
Availability
AD7981HRMZ is available at Aetrix Electronics and suitable for oil and gas exploration, avionics flight control, and heavy industrial motor drive applications requiring stable component supply under extended thermal stress.
Supply support for AD7981HRMZ 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 AD7981HRMZ belongs to Analog Devices' high-temperature qualified product line, engineered specifically for reliable signal acquisition in downhole, aerospace, and industrial environments exceeding standard automotive or industrial temperature grades.
FAQ
What is the maximum operating temperature for AD7981HRMZ?
The AD7981HRMZ is specified for continuous operation from −55°C to +175°C in its 10-lead MSOP package and is qualified for 1000 hours at +175°C. This rating is validated per Analog Devices' high-temperature qualification protocol, not extrapolated from lower-temperature data. The AD7981HRMZ maintains full parametric performance-including ±2.5 LSB INL and 92 dB dynamic range-across this entire range.
Does AD7981HRMZ support daisy-chaining with other ADCs?
Yes, AD7981HRMZ supports daisy-chain mode via its SDI input: when SDI is held low during the CNV rising edge, the device enters chain mode, allowing multiple AD7981HRMZ units to share a single SDO line with 16-cycle inter-device delay. This mode requires no external glue logic and is fully documented in the AD7981 datasheet Rev. C timing diagrams and Figure 23–24.
What reference voltage range is supported by AD7981HRMZ?
The AD7981HRMZ accepts an external reference voltage (VREF) from 2.4 V to 5.1 V, independent of the 2.5 V VDD supply. At VREF = 5 V, it achieves 92 dB dynamic range and 91 dB SNR; at VREF = 2.5 V, dynamic range drops to 87 dB but retains full 16-bit monotonicity. The REF pin requires a 10 µF decoupling capacitor placed adjacent to the AD7981HRMZ package.
Is AD7981HRMZ pin-compatible with other devices in the AD798x family?
No, AD7981HRMZ is not pin-compatible with AD7980, AD7982, or AD7984. While all share the same 10-lead MSOP footprint, pin functions differ: AD7981HRMZ assigns Pin 5 to GND and Pin 10 to VIO, whereas AD7982HRMZ swaps GND and VIO positions. This difference is explicitly shown in Figures 3 and 4 of the AD7981 Rev. C datasheet and prevents direct substitution without PCB revision.
What digital interface standards does AD7981HRMZ comply with?
The AD7981HRMZ serial interface is explicitly compatible with SPI, QSPI, MICROWIRE, and DSP protocols as stated in the Features section of the AD7981 Rev. C datasheet. It supports both 3-wire (CNV/SDO/SCK) and 4-wire (CNV/SDO/SCK/SDI) configurations, with programmable busy indication and mode selection via SDI logic level at CNV edge - no external protocol translation is required.
AD7981HRMZ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc.
- Series:
- PulSAR®
- Package/Case:
- 10-TFSOP, 10-MSOP (0.118", 3.00mm Width)
- 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 ~ 175°C
- Supplier Device Package:
- 10-MSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
AD7981HRMZ FAQ
1.How can I place an order for AD7981HRMZ through Aetrix?
Please submit a Request for Quotation (RFQ) for AD7981HRMZ 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 AD7981HRMZ reliable?
The price and inventory of AD7981HRMZ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for AD7981HRMZ is usually 5 days.
3.What payment methods are accepted for AD7981HRMZ?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for AD7981HRMZ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for AD7981HRMZ?
AD7981HRMZ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your AD7981HRMZ 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 AD7981HRMZ?
For technical support, including AD7981HRMZ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your AD7981HRMZ requirements.
6.How does Aetrix verify that AD7981HRMZ is sourced from the original manufacturer or authorized distributors?
All AD7981HRMZ 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 AD7981HRMZ meets industry standards.
7.What is the process for return or replacement of AD7981HRMZ?
All AD7981HRMZ units undergo pre-shipment inspection (PSI). If there is an issue with AD7981HRMZ, 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 AD7981HRMZ part is unused and in its original packaging.
Return procedure for AD7981HRMZ:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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