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Texas Instruments ADS1286UA
- Part No.:
- ADS1286UA
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS1286UA.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:273
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Product details
Overview
ADS1286UA from Texas Instruments is a 12-bit, 20kHz SAR analog-to-digital converter with differential input, sample-and-hold amplifier, SPI/SSI-compatible serial interface, and 250µA quiescent supply current. It operates from +4.5V to +5.25V, supports ±1 LSB integral linearity, and is housed in an 8-lead SOIC package rated for –40°C to +85°C. It targets low-power remote sensing and isolated data acquisition systems.
For engineers reviewing the ADS1286UA datasheet, ADS1286UA pinout, ADS1286UA application, or ADS1286UA equivalent, key selection considerations include its micropower operation at 20kHz sampling rate, guaranteed no-missing-codes performance, differential input architecture, SOIC-8 thermal range (–40°C to +85°C), and compatibility with 3-wire synchronous serial interfaces requiring minimal board space and isolation support.
Technical Context
The ADS1286UA implements a successive approximation register (SAR) architecture with integrated sample-and-hold amplifier and comparator. Its serial interface uses DCLOCK-synchronized falling-edge data output and CS/SHDN-controlled enable/disable sequencing, supporting both 2-wire and 3-wire configurations.
It features automatic shutdown between conversions, reducing supply current proportionally with sample rate - down to 3µA in full shutdown (CS high). Reference input accepts 1.25V to VCC+0.05V, with input resistance ≥5MΩ and leakage <±1µA, enabling flexible external reference sourcing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with monotonic transfer function and guaranteed no missing codes. |
| Sampling Rate | 20kHz maximum - enables real-time monitoring of fast transients in sensor and industrial control loops. |
| Supply Current | 250µA typical at 12.5kHz - allows battery operation for >1 year in low-duty-cycle remote nodes. |
| INL / DNL | ±2 LSB / ±1 LSB - ensures accurate representation of linear physical quantities like temperature or pressure without calibration. |
| Reference Range | 1.25V to VCC+0.05V - permits use of precision 2.5V or 4.096V references to optimize dynamic range for specific signal spans. |
| Operating Temp | –40°C to +85°C - qualified for deployment in industrial environments including motor control cabinets and outdoor telemetry enclosures. |
| Digital Interface | SPI/SSI-compatible 3-wire serial - eliminates parallel bus routing, reduces PCB layer count, and simplifies opto-isolation implementation. |
Pinout & Package
ADS1286UA is packaged in an 8-lead SOIC (Package Drawing D, MSL Level-2-260°C-1 YEAR), with 1.27mm lead pitch and body dimensions 4.9mm × 3.9mm × 1.75mm.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VREF | External reference voltage input - sets full-scale range; high-impedance node during shutdown, requires stable low-noise source. |
| 2 | +In | Non-inverting analog input - accepts differential signals up to VCC+0.2V; used with –In for noise-rejecting measurements. |
| 3 | –In | Inverting analog input - connects to system ground or remote sense point; enables true differential acquisition with common-mode rejection. |
| 4 | GND | Analog ground reference - must be star-connected to minimize digital coupling; separate from digital ground if using isolated power domains. |
| 5 | CS/SHDN | Chip select / shutdown control - active-low enables conversion and serial output; high forces full shutdown (3µA). |
| 6 | DOUT | Serial data output - outputs 12-bit straight-binary word LSB-first after one null bit; valid on falling DCLOCK edge. |
| 7 | DCLOCK | Data clock input - synchronizes serial transfer; frequency determines conversion speed (fCLK = 16 × fSAMPLE). |
| 8 | +VCC | Power supply - supplies analog and digital circuitry; requires local 0.1µF ceramic bypass capacitor placed near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 250µA at 12.5kHz sampling - enables multi-year battery life in wireless sensor nodes and portable instrumentation. |
| Differential input architecture | True differential input with common-mode rejection - suppresses EMI and ground-loop noise in industrial transducer interfaces. |
| No missing codes guarantee | Monotonic 12-bit transfer function - ensures deterministic behavior in closed-loop control applications where code gaps cause instability. |
| Auto-shutdown between conversions | Current scales with sample rate - drops to 3µA when idle, eliminating need for external power-gating circuitry. |
| Flexible reference input | 1.25V–5.3V range with 5MΩ input impedance - supports direct connection to precision voltage references or buffered DAC outputs. |
Applications
| Remote Data Acquisition | Isolated Data Acquisition |
|---|---|
Use Scenario: Wireless environmental sensors deployed across wide-area grids monitor temperature, humidity, and air quality with infrequent transmission cycles. IC Role / Device Role / Timing Role: ADC front-end digitizing conditioned analog sensor outputs; initiates conversion on wake-up interrupt and shuts down immediately after serial data transfer. Use Value: 250µA operating current and 3µA shutdown current extend CR2032 battery life beyond 3 years at 1-sample-per-minute duty cycle. |
Use Scenario: High-voltage motor drive feedback systems require galvanically isolated current and voltage sensing to protect MCU-side logic. IC Role / Device Role / Timing Role: Isolated-side ADC converting shunt voltage or Hall-effect outputs; communicates via optocoupler-isolated 3-wire serial link. Use Value: Differential input and 2-wire serial capability reduce component count and creepage/clearance requirements in compact isolation barriers. |
| Transducer Interface | Battery Operated Systems |
Use Scenario: Strain gauge bridges in portable load cells output mV-level differential signals requiring high-precision digitization without amplification. IC Role / Device Role / Timing Role: Direct bridge interface ADC - uses internal reference and differential inputs to resolve sub-10µV changes with 12-bit resolution. Use Value: ±1 LSB DNL and 500kHz small-signal bandwidth preserve mechanical resolution while rejecting 50/60Hz line noise. |
Use Scenario: Handheld multimeters and portable oscilloscopes operate from AA/AAA batteries and require extended runtime without compromising measurement fidelity. IC Role / Device Role / Timing Role: Primary system ADC handling AC/DC voltage, current, and resistance measurements; powered only during active measurement windows. Use Value: Automatic shutdown and rail-to-rail compatible logic inputs minimize auxiliary power management complexity and PCB area. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit SAR ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1286UB | Same SOIC-8 package and –40°C to +85°C rating, but ±2 LSB INL spec (vs ±2 LSB for UA); identical pinout and timing. | Targeted at cost-sensitive industrial applications where ±2 LSB linearity meets system accuracy requirements. | Select ADS1286UB if full ±1 LSB linearity is not required and B-grade qualification suffices for end-equipment certification. |
| ADS1286UL | SOIC-8 variant with ±1 LSB INL (tighter than UA's ±2 LSB), same temperature range and package; otherwise electrically identical. | Suitable for high-accuracy portable instrumentation where offset and gain stability over temperature are critical. | Choose ADS1286UL when system-level calibration is impractical and tighter factory-trimmed linearity is mandatory. |
Compared with ADS1286UA, ADS1286UB offers identical form-factor and power profile at lower linearity grade, while ADS1286UL provides superior ±1 LSB INL in the same SOIC-8 package - enabling trade-offs between accuracy assurance and BOM cost without layout changes.
Availability
ADS1286UA is available at Aetrix Electronics and suitable for remote data acquisition, isolated sensor interfaces, and battery-powered instrumentation requiring stable component supply across extended product lifecycles.
Supply support for ADS1286UA 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 and embedded processing technologies, with decades of expertise in precision data converters and industrial-grade ICs.
The ADS1286UA belongs to TI's legacy precision SAR ADC family designed for low-power, isolated, and remote sensing applications - emphasizing micropower efficiency, differential input integrity, and robust serial communication in harsh environments.
FAQ
What is the maximum sampling rate supported by the ADS1286UA?
The ADS1286UA supports a maximum sampling rate of 20kHz, achieved when DCLOCK is set to 200kHz (fCLK = 16 × fSAMPLE). This rate is guaranteed across the full operating temperature range of –40°C to +85°C and enables real-time capture of signals up to 500kHz small-signal bandwidth. The ADS1286UA maintains specified INL and DNL performance at this rate.
Does the ADS1286UA require an external reference voltage?
Yes, the ADS1286UA requires an external reference voltage applied to the VREF pin. It accepts 1.25V to VCC+0.05V (up to +5.3V), with input resistance ≥5MΩ and leakage <±1µA. The device does not include an internal reference; accuracy and noise performance directly depend on the stability and cleanliness of the external reference source connected to the ADS1286UA.
What is the function of the CS/SHDN pin on the ADS1286UA?
The CS/SHDN pin on the ADS1286UA serves dual functions: when driven low, it enables conversion and serial data output; when driven high, it places the ADS1286UA into full shutdown mode, reducing supply current to 3µA. This pin controls both chip select timing and power state, eliminating the need for separate enable and shutdown signals in low-power system designs.
Can the ADS1286UA interface directly with a microcontroller using SPI?
Yes, the ADS1286UA supports SPI-compatible 3-wire serial communication using DCLOCK, DOUT, and CS/SHDN. It outputs 12-bit straight-binary data LSB-first after one null bit, synchronized to the falling edge of DCLOCK. No additional level-shifting or protocol translation is needed for standard 5V-tolerant microcontrollers interfacing with the ADS1286UA.
What package type and lead finish does the ADS1286UA use?
The ADS1286UA is supplied in an 8-lead SOIC package (Package Drawing D), with lead finish specified as "Call TI" per official packaging documentation. It complies with RoHS, has MSL Level-2-260°C-1 YEAR rating, and is shipped in large tape-and-reel format (2500 units per reel) for automated assembly - matching the ADS1286UA/2K5G4 ordering variant.
ADS1286UA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 20k
- Number of Inputs:
- 1
- Input Type:
- Differential
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1286UA FAQ
1.How can I place an order for ADS1286UA through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1286UA 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 ADS1286UA reliable?
The price and inventory of ADS1286UA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1286UA is usually 5 days.
3.What payment methods are accepted for ADS1286UA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1286UA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1286UA?
ADS1286UA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1286UA 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 ADS1286UA?
For technical support, including ADS1286UA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1286UA requirements.
6.How does Aetrix verify that ADS1286UA is sourced from the original manufacturer or authorized distributors?
All ADS1286UA 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 ADS1286UA meets industry standards.
7.What is the process for return or replacement of ADS1286UA?
All ADS1286UA units undergo pre-shipment inspection (PSI). If there is an issue with ADS1286UA, 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 ADS1286UA part is unused and in its original packaging.
Return procedure for ADS1286UA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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