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Texas Instruments ADS8681IPW
- Part No.:
- ADS8681IPW
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 16-TSSOP (0.173", 4.40mm Width)
- Datasheet:
-
ADS8681IPW.pdf
- Description:
- IC ADC 16BIT SAR 16TSSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,061
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Product details
Overview
ADS8681IPW from Texas Instruments is a 16-bit, 1-MSPS successive approximation register (SAR) analog-to-digital converter with integrated analog front-end, software-programmable bipolar/unipolar input ranges (±12.288 V to ±2.56 V or 0–12.288 V), on-chip 4.096-V low-drift reference, and multiSPI™ interface. It delivers ±0.4 LSB DNL, 92 dB SNR, and operates across –40°C to +125°C for high-precision industrial data acquisition.
For engineers reviewing the ADS8681IPW datasheet, ADS8681IPW pinout, ADS8681IPW application, or ADS8681IPW equivalent, this page provides verified technical context, package-specific pin functions, real-world application mappings, and validated alternative options - all aligned to the official SBAS633E revision E datasheet.
Technical Context
The ADS8681IPW implements a single-supply 5-V SAR ADC architecture with integrated PGA, second-order LPF, overvoltage protection (±20 V), and programmable gain/offset calibration per input range. Its constant ≥1 MΩ resistive input impedance is maintained across all 9 software-selectable ranges.
It supports three serial interface modes: standard SPI, multiSPI daisy-chain (dual SDO), and source-synchronous (internal or external clock), with RVS signal indicating conversion status and ALARM output enabling high/low threshold monitoring without host intervention.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 16-bit - guarantees no missing codes and full-scale quantization step of 376 µV at ±12.288-V range. |
| Sampling Rate | 1 MSPS - enables real-time capture of signals up to 500 kHz (Nyquist) with minimal latency. |
| DNL / INL | ±0.4 LSB / ±0.5 LSB - ensures monotonicity and <0.008% full-scale linearity error for precision control loops. |
| SNR / THD | 92 dB / –107 dB - supports accurate measurement of low-amplitude harmonics in servo drive feedback paths. |
| Input Ranges | Software-configurable: ±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, ±2.56 V, and unipolar 0–12.288 V variants - eliminates external level-shifting circuitry. |
| Reference | On-chip 4.096-V reference with ≤7 ppm/°C drift - removes need for external precision reference and reduces BOM count. |
| Supply Range | AVDD = 4.75–5.25 V; DVDD = 1.65–3.3 V - enables interoperability with 1.8-V, 2.5-V, and 3.3-V digital controllers. |
| Temperature Range | –40°C to +125°C - qualified for under-hood automotive sensors, motor drives, and industrial PLC analog input modules. |
Pinout & Package
TSSOP-16 (PW) package: 5.00 mm × 4.40 mm body, lead pitch 0.65 mm, exposed pad not present. Pinout matches Figure 5-1 in SBAS633E Rev E.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN_P / AIN_GND | Analog differential input pair | High-impedance (≥1 MΩ), ±20-V overvoltage protected inputs; support true bipolar operation without external op-amps. |
| CONVST/CS | Dual-function digital control | Rising edge initiates conversion (CONVST mode); active-low enables serial bus access (CS mode) - simplifies timing in microcontroller-based systems. |
| SDO-0 / SDO-1 | Serial data outputs | Supports daisy-chain configuration (multiSPI); SDO-0 carries main conversion result, SDO-1 conveys status flags - reduces GPIO count in multi-channel systems. |
| ALARM/SDO-1/GPO | Configurable output | Hardware interrupt for out-of-range detection (programmable high/low thresholds); eliminates polling overhead in real-time control firmware. |
| RST | Asynchronous reset | Active-low, 100-ns minimum pulse width - enables deterministic recovery after brownout or watchdog timeout. |
| REFIO / REFCAP / REFGND | Reference subsystem terminals | REFIO outputs internal 4.096-V reference; REFCAP requires 10-µF decoupling; REFGND must be shorted to AGND - ensures stable reference for <±0.5 LSB INL. |
Key Features
| Feature | Design Value |
|---|---|
| Programmable input ranges | 9 software-selectable ranges (5 bipolar + 4 unipolar) - eliminates external gain-switching circuitry and reduces PCB area by >30% vs discrete solutions. |
| Integrated overvoltage protection | ±20 V tolerance on AIN_P/AIN_GND with AVDD = 5 V - protects against transients in industrial field wiring without external TVS diodes. |
| multiSPI™ interface | Dual-SDO daisy-chain capability with configurable CPOL/CPHA - enables scalable multi-channel acquisition using single SPI peripheral on MCU/FPGA. |
| On-chip reference | 4.096-V reference with ≤7 ppm/°C drift and 20-ms turn-on time - achieves system-level accuracy without external reference IC or trimming. |
| Alarm output with thresholds | Independent high/low voltage thresholds set via registers - provides hardware-triggered fault response in safety-critical motion control applications. |
| Extended temperature operation | Specified performance from –40°C to +125°C - supports deployment in servo drive power stages and automotive engine control units. |
Applications
| Analog Input Module | Semiconductor Test Equipment |
|---|---|
|
Use Scenario: High-density PLC analog input card acquiring sensor data from multiple field devices (RTDs, strain gauges, 4–20 mA loops). IC Role / Device Role / Timing Role: Primary ADC with integrated front-end, handling ±10.24 V and 0–5.12 V ranges simultaneously across channels via software reconfiguration. Use Value: Eliminates external signal conditioning per channel, reducing component count by 40% and enabling 16-channel 16-bit acquisition in 100 mm² board area. |
Use Scenario: Parametric tester measuring leakage current and threshold voltage of power MOSFETs during wafer sort. IC Role / Device Role / Timing Role: Precision digitizer capturing sub-mV-level analog signatures with 1-MSPS throughput and <±0.5 LSB INL. Use Value: Achieves <0.01% measurement repeatability at 25°C and maintains <0.02% drift over –40°C to +125°C thermal cycling. |
| Servo Drive Control Module | Industrial Motor Protection Relay |
|
Use Scenario: Real-time current and bus voltage sensing in closed-loop PMSM motor control with field-oriented control (FOC). IC Role / Device Role / Timing Role: Synchronized dual-channel sampling (via CONVST edge) feeding current loop PID execution at 20-kHz update rate. Use Value: 665-ns conversion time + 335-ns acquisition enables <500-ns total latency - meets IEC 61800-5-1 functional safety timing constraints. |
Use Scenario: Overcurrent, phase-loss, and ground-fault detection in medium-voltage motor starter panels. IC Role / Device Role / Timing Role: Fault-monitoring ADC triggering ALARM output within 1 µs of exceeding programmable thresholds on AIN_P. Use Value: Hardware-level response bypasses firmware latency, cutting trip time to <2 µs - exceeds UL 508 Category B response requirements. |
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 |
|---|---|---|---|
| ADS8685IPW | 500-kSPS max rate; identical pinout, package, and feature set except lower speed and slightly relaxed SNR (92 dB vs 92 dB typical, same min) | Used where 1-MSPS is unnecessary - e.g., slower sensor monitoring or cost-sensitive designs accepting 2× lower throughput | Select ADS8685IPW only if system sampling requirement is ≤500 kSPS; retains full software compatibility and layout reuse. |
| AD7606C-16BSTZ | 8-channel simultaneous-sampling, ±10-V fixed range, 1-MSPS, but requires external reference and separate power supplies for analog/digital sections | Preferred for multi-channel synchronized acquisition (e.g., vibration analysis), not single-channel high-flexibility applications | Choose AD7606C-16BSTZ when simultaneous sampling across ≥2 channels is mandatory; ADS8681IPW offers superior range flexibility and lower system-level BOM. |
Compared with ADS8685IPW, the ADS8681IPW delivers twice the throughput for dynamic control loops; versus AD7606C-16BSTZ, it trades channel count for software-programmable ranges and integrated reference - optimizing for single-channel precision and design simplicity.
Availability
ADS8681IPW is available at Aetrix Electronics and suitable for analog input modules, semiconductor test equipment, and servo drive control modules requiring stable component supply, long-term lifecycle support, and guaranteed traceable sourcing.
Supply support for ADS8681IPW 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 company specializing in analog and embedded processing technologies, with leadership in precision data converters and industrial-grade signal chain solutions.
The ADS868x family was designed for high-reliability industrial data acquisition systems requiring software-configurable input ranges, integrated protection, and extended temperature operation - targeting PLCs, motor drives, and automated test equipment.
FAQ
What input voltage ranges does the ADS8681IPW support?
The ADS8681IPW supports nine software-programmable input ranges: five bipolar (±12.288 V, ±10.24 V, ±6.144 V, ±5.12 V, ±2.56 V) and four unipolar (0–12.288 V, 0–10.24 V, 0–6.144 V, 0–5.12 V). Each range is calibrated for gain and offset error, and selection is performed by writing to internal configuration registers - no external hardware changes are needed to switch ranges.
Does the ADS8681IPW require an external reference voltage?
No, the ADS8681IPW includes an on-chip 4.096-V reference with ≤7 ppm/°C drift and 20-ms turn-on time. The REFIO pin can be configured as a reference output, and REFCAP requires a 10-µF decoupling capacitor. An external reference may be used via the REFIO pin (4.046–4.146 V range), but it is not required - the internal reference meets full 16-bit linearity specifications across –40°C to +125°C.
What is the purpose of the ALARM pin on the ADS8681IPW?
The ALARM pin on the ADS8681IPW is a multifunction output that operates as a hardware comparator alarm. When enabled, it asserts high when the converted input voltage exceeds user-programmable high or low thresholds - independent of host processor polling. This enables deterministic fault response in real-time control systems, such as immediate shutdown in overvoltage conditions within servo drives.
Can the ADS8681IPW interface with a microcontroller using standard SPI?
Yes, the ADS8681IPW supports standard SPI protocol (CPOL = 0 or 1, CPHA = 0 or 1) with SCLK up to 66.67 MHz. Its CONVST/CS pin operates in chip-select mode, and SDO-0 provides conversion data. The device also supports enhanced multiSPI™ modes including daisy-chain and source-synchronous interfaces - all backward-compatible with legacy SPI peripherals without firmware modification.
What package options are available for the ADS8681IPW?
The ADS8681IPW is offered exclusively in the TSSOP-16 (PW) package: 5.00 mm × 4.40 mm body size, 0.65 mm lead pitch, with no exposed thermal pad. This package is distinct from the WQFN-16 (RUM) variant used by other ADS868x members - ADS8681IPW is not pin-compatible with RUM-packaged versions, and layout must follow the PW footprint specified in TI's SBAS633E datasheet.
ADS8681IPW Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 16-TSSOP (0.173", 4.40mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 16
- Sampling Rate (Per Second):
- 1M
- Number of Inputs:
- 1
- Input Type:
- Pseudo-Differential, Single Ended
- Data Interface:
- SPI
- Configuration:
- PGA-S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 1.65V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 125°C (TA)
- Supplier Device Package:
- 16-TSSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS8681IPW FAQ
1.How can I place an order for ADS8681IPW through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS8681IPW 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 ADS8681IPW reliable?
The price and inventory of ADS8681IPW are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS8681IPW is usually 5 days.
3.What payment methods are accepted for ADS8681IPW?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS8681IPW transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS8681IPW?
ADS8681IPW orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS8681IPW 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 ADS8681IPW?
For technical support, including ADS8681IPW datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS8681IPW requirements.
6.How does Aetrix verify that ADS8681IPW is sourced from the original manufacturer or authorized distributors?
All ADS8681IPW 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 ADS8681IPW meets industry standards.
7.What is the process for return or replacement of ADS8681IPW?
All ADS8681IPW units undergo pre-shipment inspection (PSI). If there is an issue with ADS8681IPW, 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 ADS8681IPW part is unused and in its original packaging.
Return procedure for ADS8681IPW:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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