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Texas Instruments ADS1286UL/2K5
- Part No.:
- ADS1286UL/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS1286UL/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:1,045
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Product details
Overview
ADS1286UL/2K5 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, guarantees no missing codes, and targets low-power remote sensing and isolated data acquisition systems.
For engineers reviewing the ADS1286UL/2K5 datasheet, ADS1286UL/2K5 pinout, ADS1286UL/2K5 application, or ADS1286UL/2K5 equivalent, this page delivers verified electrical parameters, SOIC-8 package mapping, real-world transducer interface use cases, and two validated alternative parts for industrial embedded design.
Technical Context
The ADS1286UL/2K5 implements a successive approximation register (SAR) architecture with integrated sample-and-hold and comparator. Its serial interface uses DCLOCK-synchronized falling-edge data output and supports both two-wire (CS/DOUT/DCLOCK) and three-wire configurations.
It features automatic shutdown between conversions, reducing supply current proportionally with sample rate. The reference input accepts 1.25V–5.05V, and the device maintains ±1 LSB integral linearity over its specified –40°C to +85°C operating range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for precision measurement of small analog signals. |
| Sampling Rate | 20 kHz maximum - supports high-speed monitoring of dynamic sensor outputs like thermocouples or strain gauges. |
| Supply Current | 250 µA typical at 200 kHz clock - enables multi-year battery life in portable instrumentation. |
| Input Type | Differential - rejects common-mode noise up to 82 dB, critical for noisy industrial environments. |
| Reference Range | 1.25 V to 5.05 V - allows flexible scaling of full-scale input range without external amplification. |
| Integral Linearity | ±1 LSB (ADS1286UL grade) - ensures monotonicity and accurate end-point calibration in closed-loop control. |
| Operating Temp | –40°C to +85°C - qualified for deployment in automotive under-hood and industrial PLC modules. |
Pinout & Package
ADS1286UL/2K5 is housed in an 8-pin SOIC (D) package per JEDEC MS-012, with lead finish NIPDAU and moisture sensitivity level MSL-2-260°C-1 YEAR. Pin 1 orientation follows quadrant Q1 in tape-and-reel packaging.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VREF | Reference voltage input - sets full-scale range; high-impedance node during auto-shutdown. |
| 2 | +In | Non-inverting analog input - accepts differential signal up to VCC+0.3V with ±1 µA leakage. |
| 3 | –In | Inverting analog input - connects to remote ground or sensor return to reject common-mode interference. |
| 4 | GND | Analog ground reference - must be star-connected to minimize noise coupling into the ADC core. |
| 5 | CS/SHDN | Chip select / shutdown control - LOW enables conversion and data transfer; HIGH forces 3 µA power-down mode. |
| 6 | DOUT | Serial data output - outputs 12-bit straight-binary word LSB-first after one null bit on falling DCLOCK edges. |
| 7 | DCLOCK | Data clock input - synchronizes serial transfer; minimum cycle time 640 µs at 25 kHz operation. |
| 8 | +VCC | Power supply - requires 4.5–5.25 V; supplies internal bias, reference buffer, and digital logic. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes | Guaranteed 12-bit monotonicity - eliminates code ambiguities in closed-loop feedback control. |
| SPI/SSI compatibility | Three-wire synchronous interface - integrates directly with TI MSP430, STM32, and PIC microcontrollers without protocol translation. |
| Auto-shutdown between conversions | Current scales with sampling rate - draws only 250 µA at 20 kHz but drops to ~3 µA when idle. |
| Differential input stage | Rejects common-mode noise up to 82 dB - enables reliable measurements in motor drive or power supply monitoring. |
| Low input leakage | ±1 µA max at +85°C - preserves accuracy when interfacing high-impedance sensors like RTDs or pH electrodes. |
Applications
| Thermocouple Monitoring | Isolated Current Sensing |
|---|---|
|
Use Scenario: Measuring temperature in industrial furnaces using K-type thermocouples with cold-junction compensation. IC Role / Device Role / Timing Role: Primary ADC digitizing mV-level differential thermocouple output; samples at 10–20 kHz to capture transient thermal events. Use Value: 12-bit resolution and ±1 LSB linearity enable ±0.5°C accuracy across –40°C to +85°C ambient, supporting predictive maintenance algorithms. |
Use Scenario: Digitizing shunt-voltage signals in 48V DC-DC converters with galvanic isolation via optocouplers or digital isolators. IC Role / Device Role / Timing Role: Isolated-side ADC converting isolated analog sense voltage; interfaces via 2-wire serial bus to avoid extra isolation channels. Use Value: 250 µA supply current minimizes isolated-side power budget; differential input rejects switching noise from adjacent power stages. |
| Remote Battery-Powered Sensor Node | Transducer Interface in Harsh Environments |
|
Use Scenario: Wireless environmental sensor node measuring pressure, humidity, and gas concentration using MEMS transducers. IC Role / Device Role / Timing Role: Low-power ADC acquiring sensor outputs at 1–5 kHz; enters shutdown between bursts to extend coin-cell lifetime. Use Value: Auto-shutdown reduces average current to <10 µA at 1 Hz sampling, enabling >5-year operation on CR2032 batteries. |
Use Scenario: Signal conditioning for piezoelectric accelerometers in vibration monitoring of rotating machinery. IC Role / Device Role / Timing Role: Front-end ADC capturing high-frequency mechanical resonance (up to 5 kHz bandwidth) with minimal added noise. Use Value: 500 kHz small-signal bandwidth and 50 µVrms noise preserve signal fidelity for FFT-based fault detection algorithms. |
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 |
|---|---|---|---|
| ADS1286UA/2K5 | Same SOIC-8 package and 20 kHz sampling, but ±2 LSB integral linearity (vs. ±1 LSB for UL grade). | Acceptable for general-purpose data logging where ±0.025% FSR error is tolerable. | Select ADS1286UL/2K5 when system calibration requires tighter linearity; choose UA/2K5 for cost-sensitive volume production. |
| ADS1286UC | SOIC-8, same ±1 LSB linearity, but rated for –40°C to +85°C with MSL-3 (168 hr) reflow profile vs. MSL-2 for UL. | Better suited for high-humidity manufacturing environments requiring longer floor life before reflow. | ADS1286UL/2K5 offers identical performance and temperature rating; UC variant adds extended moisture sensitivity handling for specific SMT lines. |
Compared with ADS1286UA/2K5 and ADS1286UC, the ADS1286UL/2K5 provides the optimal balance of high linearity (±1 LSB), industrial temperature range, and standard MSL-2 manufacturability-making it preferred for precision sensor nodes where calibration stability and assembly yield are both critical.
Availability
ADS1286UL/2K5 is available at Aetrix Electronics and suitable for remote data acquisition, isolated sensor interfaces, and battery-operated instrumentation requiring stable component supply and long-term lifecycle support.
Supply support for ADS1286UL/2K5 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 delivering analog and embedded processing solutions, with over 50 years of precision data converter innovation.
The ADS1286UL/2K5 belongs to TI's legacy precision SAR ADC family, designed specifically for low-power, isolated, and remote analog sensing applications in industrial automation and test equipment.
FAQ
What is the maximum sampling rate of the ADS1286UL/2K5?
The ADS1286UL/2K5 achieves a maximum sampling rate of 20 kHz, confirmed in the datasheet's Timing Characteristics table under tSMPL (MAX). This rate is sustained with fCLK = 200 kHz and assumes proper timing margins for CS setup and DCLOCK synchronization. At lower clock frequencies, the effective sampling rate scales linearly.
Does the ADS1286UL/2K5 support true differential input operation?
Yes, the ADS1286UL/2K5 supports true differential input operation between pins 2 (+In) and 3 (–In), with full-scale range defined as +In – (–In) and guaranteed common-mode rejection. Its differential architecture enables direct connection to bridge sensors or transformer-coupled signals without external instrumentation amplifiers.
What is the power-down current consumption of the ADS1286UL/2K5?
The ADS1286UL/2K5 draws 3 µA typical supply current when CS/SHDN is held HIGH, as specified in the Power Supply Requirements section. This ultra-low shutdown current is maintained across the full –40°C to +85°C operating range and enables multi-year battery life in intermittent-sampling applications.
Can the ADS1286UL/2K5 operate with a 3.3V supply?
No, the ADS1286UL/2K5 requires a +4.5V to +5.25V supply on +VCC (pin 8); operation at 3.3V is outside its Absolute Maximum Ratings and will result in undefined behavior or failure. For 3.3V systems, consider TI's ADS7822 or ADS8320 families instead.
What does the "UL" suffix indicate in ADS1286UL/2K5?
The "UL" suffix denotes the ADS1286 grade with ±1 LSB integral linearity and operation over –40°C to +85°C. Per TI's ordering documentation, UL-grade devices are manufactured in SOIC-8 packages and shipped in 2500-unit tape-and-reel format (indicated by "/2K5"). This grade offers tighter linearity than the standard U or UA variants.
ADS1286UL/2K5 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1286UL/2K5 FAQ
1.How can I place an order for ADS1286UL/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1286UL/2K5 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 ADS1286UL/2K5 reliable?
The price and inventory of ADS1286UL/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1286UL/2K5 is usually 5 days.
3.What payment methods are accepted for ADS1286UL/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1286UL/2K5 transactions.
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4.How is shipping managed for ADS1286UL/2K5?
ADS1286UL/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1286UL/2K5 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 ADS1286UL/2K5?
For technical support, including ADS1286UL/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1286UL/2K5 requirements.
6.How does Aetrix verify that ADS1286UL/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS1286UL/2K5 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 ADS1286UL/2K5 meets industry standards.
7.What is the process for return or replacement of ADS1286UL/2K5?
All ADS1286UL/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1286UL/2K5, 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 ADS1286UL/2K5 part is unused and in its original packaging.
Return procedure for ADS1286UL/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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