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Texas Instruments ADS8681WRUMT
- Part No.:
- ADS8681WRUMT
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-WQFN Exposed Pad
- Datasheet:
-
ADS8681WRUMT.pdf
- Description:
- 16-bit, 1MSPS, one-channel, wide
- Quantity:
- Payment:
- Shipping:
Inventory:2,584
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Product details
Overview
ADS8681WRUMT from Texas Instruments is a 16-bit, 1-MSPS successive approximation register (SAR) analog-to-digital converter with integrated analog front-end, programmable bipolar/unipolar input ranges (±12.288 V to ±2.56 V), on-chip 4.096-V reference, and multiSPI™ interface. It delivers ±0.6 LSB DNL/INL, 80 dB SNR, and operates from –40°C to +125°C for high-accuracy industrial data acquisition.
For engineers reviewing the ADS8681WRUMT datasheet, ADS8681WRUMT pinout, ADS8681WRUMT application, or ADS8681WRUMT equivalent, this page provides verified specifications, package mapping, functional pin roles, real-world use cases in servo control and semiconductor test systems, and validated alternative parts for design flexibility and supply continuity.
Technical Context
The ADS8681WRUMT implements a true single-supply 5-V SAR ADC architecture with integrated differential AFE, overvoltage protection up to ±20 V, and constant ≥1 MΩ resistive input impedance across all software-selectable ranges. Its conversion timing is deterministic: 665 ns conversion time, 335 ns acquisition time, and full-cycle throughput of 1 MSPS.
It supports three serial interface modes - standard SPI, multiSPI daisy-chain, and source-synchronous (internal/external clock) - with RVS and ALARM/SDO-1/GPO pins enabling real-time status monitoring and threshold-triggered alerts. The device uses an internal 4.096-V reference with 5 ppm/°C drift and requires 4.7 µF (REFIO) and 10 µF (REFCAP) decoupling capacitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - delivers 65,536 discrete output codes for high-fidelity signal digitization in precision measurement. |
| Sampling Rate | 1 MSPS - enables real-time capture of fast transients in motor control feedback loops and automated test equipment. |
| Input Ranges | Software-programmable bipolar (±12.288 V to ±2.56 V) and unipolar (0–12.288 V to 0–5.12 V) - eliminates external gain-switching circuitry. |
| DC Accuracy | ±0.6 LSB DNL and ±0.6 LSB INL (bipolar) - ensures monotonicity and minimal code-width deviation across full scale. |
| AC Performance | 80 dB SNR and –105 dB THD - supports high dynamic range applications such as vibration analysis and power quality monitoring. |
| Input Protection | ±20 V absolute max on AIN_P/AIN_M - allows direct connection to industrial field signals without external clamping. |
| Reference | On-chip 4.096-V reference with 5 ppm/°C drift - reduces BOM count and improves system-level temperature stability vs. external references. |
Pinout & Package
The ADS8681WRUMT is housed in a 4 mm × 4 mm, 16-pin WQFN (RUM) package with wettable flanks, optimized for thermal performance (RθJA = 31.9°C/W) and automated optical inspection.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN_P / AIN_M | Differential analog input pair | High-impedance (≥1 MΩ), protected inputs accepting programmable bipolar/unipolar spans; require matched PCB routing and local decoupling. |
| CONVST/CS | Dual-function digital control | Active-high conversion start or active-low chip select - determines interface mode and bus contention behavior during multi-device communication. |
| SCLK / SDI / SDO-0 / SDO-1 / RVS | multiSPI™ serial interface signals | Supports daisy-chain, dual-output, and source-synchronous protocols; RVS provides real-time ADC state visibility independent of CS level. |
| ALARM/SDO-1/GPO | Configurable multifunction output | Active-high alarm flag triggered by user-defined high/low thresholds; also serves as secondary data output or general-purpose I/O. |
| REFIO / REFCAP / REFGND | Reference subsystem terminals | REFIO outputs internal 4.096 V; REFCAP stabilizes ADC reference voltage; REFGND must be shorted to AGND for optimal noise rejection. |
| AVDD / DVDD / AGND / DGND | Power and ground domains | Separate analog/digital supplies (5 V / 1.65–3.3 V) and grounds prevent coupling noise; AVDD must be decoupled locally to AGND. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable input ranges | Eight software-selectable differential ranges eliminate external gain-setting resistors and simplify firmware-driven sensor interfacing. |
| Constant input impedance | ≥1 MΩ across all ranges ensures consistent loading on upstream signal sources, avoiding range-dependent gain errors. |
| Integrated overvoltage protection | ±20 V tolerance on AIN_P/AIN_M enables robust operation in noisy industrial environments without external TVS diodes. |
| multiSPI™ interface | Daisy-chain capability reduces host GPIO count and simplifies multi-channel system expansion with synchronized sampling. |
| ALARM threshold monitoring | Hardware-based high/low limit detection offloads real-time decision logic from the host MCU, reducing latency in safety-critical responses. |
Applications
| Analog Input Module | Semiconductor Test System |
|---|---|
Use Scenario: High-density industrial PLC analog input cards acquiring voltage/current signals from sensors and actuators in harsh factory environments. IC Role / Device Role / Timing Role: Primary SAR ADC with integrated AFE, providing isolated, range-programmable digitization at 1 MSPS with ±20 V fault tolerance. Use Value: Reduces external component count by integrating reference, protection, and programmable gain-cutting board area and calibration complexity. | Use Scenario: Automated test equipment (ATE) performing parametric measurements on ICs and discrete semiconductors under temperature stress. IC Role / Device Role / Timing Role: Precision DC/AC characterization engine capturing voltage, current, and leakage data with <±0.6 LSB linearity and 80 dB SNR. Use Value: Enables traceable, high-repeatability measurements across –40°C to +125°C without recalibration due to low-drift reference and stable INL/DNL. |
| Servo Drive Control | Power Quality Monitor |
Use Scenario: Real-time current/voltage sensing in closed-loop servo amplifiers for robotics and CNC motion control. IC Role / Device Role / Timing Role: High-speed feedback ADC synchronizing with PWM switching cycles; supports fast acquisition (335 ns) and deterministic 1-MSPS throughput. Use Value: Delivers sub-microsecond timing resolution for accurate current reconstruction and torque ripple suppression. | Use Scenario: Grid-edge monitoring devices measuring harmonics, flicker, and transient events in medium-voltage distribution systems. IC Role / Device Role / Timing Role: High-fidelity front-end digitizer capturing wideband waveforms (450 kHz input bandwidth) with –105 dB THD for IEEE 519-compliant analysis. Use Value: Achieves Class A accuracy per IEC 61000-4-30 Ed. 3 using on-chip reference and calibrated bipolar ranges-no external trimming required. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS8685WRUMT | 500 kSPS max sampling rate; identical pinout, package, and feature set except lower speed and reduced power consumption (4–5 mA AVDD active). | Preferred for lower-bandwidth applications like slow-scan DAQ or battery-powered condition monitoring where 1 MSPS is unnecessary. | Select when system throughput requirements are ≤500 kSPS and lower power draw is prioritized over speed. |
| AD7606C-16BSTZ | 8-channel, simultaneous-sampling 16-bit SAR ADC; requires external reference; no integrated OVP; different SPI timing and register map. | Suitable for multi-channel synchronized acquisition (e.g., motor phase currents), but lacks per-channel range programming and ±20 V protection. | Choose for systems needing 8-channel parallel sampling, but expect added BOM cost and layout complexity for reference and protection circuits. |
Compared with ADS8685WRUMT and AD7606C-16BSTZ, the ADS8681WRUMT uniquely combines 1-MSPS throughput, per-channel software-programmable bipolar ranges, integrated ±20 V OVP, and on-chip reference in a compact WQFN - making it optimal for space-constrained, high-speed, single-channel industrial DAQ where robustness and configurability are critical.
Availability
ADS8681WRUMT is available at Aetrix Electronics and suitable for analog input modules, semiconductor test systems, and servo drive control requiring stable component supply, long-term manufacturability, and automotive-grade temperature support (–40°C to +125°C).
Supply support for ADS8681WRUMT 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
Texas Instruments is a global semiconductor leader specializing in analog, embedded processing, and high-reliability ICs for industrial, automotive, and communications markets.
The ADS868xW family was designed specifically for ruggedized industrial data acquisition - emphasizing programmability, fault resilience, and simplified system integration through integrated reference, protection, and flexible digital interfacing.
FAQ
What is the maximum sampling rate supported by the ADS8681WRUMT?
The ADS8681WRUMT supports a maximum sampling rate of 1 million samples per second (1 MSPS), with a fixed 665 ns conversion time and 335 ns acquisition time. This throughput is guaranteed across its full operating temperature range (–40°C to +125°C) and all programmable input ranges, enabling real-time capture of fast industrial signals without interpolation or oversampling.
Does the ADS8681WRUMT require an external reference voltage?
No, the ADS8681WRUMT includes a highly stable on-chip 4.096-V reference with 5 ppm/°C temperature drift and 4.7 µF decoupling on REFIO. External reference operation is optional via the REFIO pin, but not required - the internal reference meets full-spec AC/DC performance including 80 dB SNR and ±0.6 LSB INL across temperature.
How does the ALARM function work on the ADS8681WRUMT?
The ALARM pin on the ADS8681WRUMT is a multifunction output (ALARM/SDO-1/GPO) that asserts high when the converted input voltage exceeds user-programmable high or low thresholds stored in dedicated registers. It operates independently of the serial interface and provides hardware-level response in <1 µs, eliminating MCU polling overhead in time-critical overvoltage or undervoltage detection.
What package type and dimensions does the ADS8681WRUMT use?
The ADS8681WRUMT uses a 16-pin WQFN package designated RUM, measuring 4.0 mm × 4.0 mm with wettable flanks. It features a thermal pad on the bottom for enhanced heat dissipation (RθJB = 7.4°C/W) and is compatible with standard reflow profiles per JEDEC J-STD-020. Pin pitch is 0.65 mm.
Can the ADS8681WRUMT interface with microcontrollers lacking native multiSPI support?
Yes, the ADS8681WRUMT's multiSPI™ interface is fully backward-compatible with standard SPI (CPOL=0/1, CPHA=0/1). It operates in conventional 4-wire mode using CONVST/CS, SCLK, SDI, and SDO-0 - requiring no special controller peripherals. The advanced multiSPI features (daisy-chain, dual SDO, source-synchronous) are optional enhancements.
ADS8681WRUMT Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- ADS868xW
- Package/Case:
- 16-WQFN Exposed Pad
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- PGA-ADC
- Ratio - S/H:ADC:
- 0:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 1.65V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 125°C
- Supplier Device Package:
- 16-WQFN (4x4)
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8681WRUMT FAQ
1.How can I place an order for ADS8681WRUMT through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8681WRUMT 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 ADS8681WRUMT reliable?
The price and inventory of ADS8681WRUMT are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8681WRUMT is usually 5 days.
3.What payment methods are accepted for ADS8681WRUMT?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8681WRUMT transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8681WRUMT?
ADS8681WRUMT orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8681WRUMT 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 ADS8681WRUMT?
For technical support, including ADS8681WRUMT datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8681WRUMT requirements.
6.How does Aetrix verify that ADS8681WRUMT is sourced from the original manufacturer or authorized distributors?
All ADS8681WRUMT 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 ADS8681WRUMT meets industry standards.
7.What is the process for return or replacement of ADS8681WRUMT?
All ADS8681WRUMT units undergo pre-shipment inspection (PSI). If there is an issue with ADS8681WRUMT, 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 ADS8681WRUMT part is unused and in its original packaging.
Return procedure for ADS8681WRUMT:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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