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Texas Instruments ADS1286U-TI
- Part No.:
- ADS1286U-TI
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS1286U-TI.pdf
- Description:
- ADC, SUCCESSIVE APPROXIMATION, 1
- Quantity:
- Payment:
- Shipping:
Inventory:3,866
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Product details
Overview
The ADS1286U-TI 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 a +4.5V to +5.25V supply, supports 5V reference input, and is used in isolated remote data acquisition systems where low power and serial simplicity are critical.
For engineers reviewing the ADS1286U-TI datasheet, ADS1286U-TI pinout, ADS1286U-TI application, or ADS1286U-TI equivalent, key selection considerations include guaranteed no-missing-codes performance, micropower shutdown behavior (3µA), SOIC-8 packaging, differential input voltage range up to ±VREF, and compatibility with 2- or 3-wire synchronous serial communication at up to 200kHz clock rate.
Technical Context
The ADS1286U-TI 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 SPI and SSI protocols without external framing logic.
Conversion timing is deterministic: 12 clock cycles for conversion, 1.5–2.0 clock cycles for analog input sampling, and data valid within 85–150ns after DCLOCK↓. The device achieves ±1 LSB integral linearity and ±0.5 LSB differential linearity over its full temperature range, with 72dB SINAD and 90dB SFDR at 1kHz input.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with guaranteed no missing codes. |
| Sampling Rate | 20kHz maximum - supports real-time monitoring of fast transients in sensor interfaces. |
| Supply Current | 250µA typical at 12.5kHz - enables battery operation for >1 year in low-duty-cycle remote sensing. |
| Reference Input | 1.25V to 5.05V - allows flexible scaling of input range while maintaining linearity down to 1V. |
| Integral Linearity | ±1 LSB max - ensures accurate end-point accuracy in precision measurement applications. |
| Digital Interface | SPI/SSI-compatible 3-wire - eliminates need for additional protocol translation hardware. |
| Power Down Current | 3µA - reduces system standby power when idle between conversions. |
Pinout & Package
The ADS1286U-TI is housed in an 8-pin SOIC package (Package Drawing D, JEDEC MS-012), with 1.27mm pitch, 5.0mm × 6.2mm body size, and RoHS-compliant NiPdAu lead finish (Level-2 or Level-3 MSL rating depending on variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF (Pin 1) | Reference voltage input | Sets full-scale input range; accepts 1.25V–5.05V; high-impedance (>5MΩ) when CS = VCC. |
| +In (Pin 2) | Differential analog input (+) | Accepts signal up to VCC+0.2V; input leakage ≤±1µA; capacitance = 25pF. |
| –In (Pin 3) | Differential analog input (–) | Used for remote ground sensing or common-mode rejection; same voltage limits as +In. |
| GND (Pin 4) | Analog/digital ground reference | Single ground pin shared by analog and digital sections; requires low-impedance PCB connection. |
| CS/SHDN (Pin 5) | Chip select / shutdown control | Active-low chip select; HIGH disables all circuitry and reduces current to 3µA. |
| DOUT (Pin 6) | Serial data output | Outputs 12-bit straight-binary code LSB-first after one null bit; valid on falling DCLOCK edge. |
| DCLOCK (Pin 7) | Serial interface clock input | Synchronizes data transfer; supports fCLK up to 200kHz; determines conversion speed (fCLK = 16×fSAMPLE). |
| +VCC (Pin 8) | Power supply | +4.5V to +5.25V; supplies analog and digital sections; bypass capacitor required near pin. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 250µA at 12.5kHz sampling - enables multi-year battery life in wireless sensor nodes. |
| No missing codes guarantee | 12-bit monotonicity ensured across full temperature range - eliminates data gaps in critical logging. |
| Differential input architecture | Rejects common-mode noise up to 500kHz bandwidth - improves SNR in noisy industrial environments. |
| Auto-shutdown between conversions | Current drops to 3µA when CS = HIGH - simplifies power management without external control logic. |
| Flexible reference support | Operates with VREF from 1.25V to 5.05V - allows trade-off between resolution, noise margin, and dynamic range. |
Applications
| Remote Data Acquisition | Isolated Sensor Interface |
|---|---|
Use Scenario: Long-distance environmental monitoring using solar-charged batteries and RF telemetry. IC Role / Device Role / Timing Role: Primary ADC digitizing thermocouple or RTD outputs with differential input and low-noise sampling. Use Value: 250µA operating current and 3µA shutdown extend battery life; SOIC-8 eases isolation barrier layout. | Use Scenario: Industrial PLC analog input module with opto-isolated digital interface. IC Role / Device Role / Timing Role: Isolated-side ADC converting 4–20mA loop signals or bridge sensor outputs. Use Value: Differential input rejects ground-loop noise; SPI/SSI compatibility simplifies interface to isolated microcontroller. |
| Transducer Signal Conditioning | Battery-Powered Instrumentation |
Use Scenario: Portable pressure or strain gauge meter with auto-ranging front-end. IC Role / Device Role / Timing Role: High-linearity ADC capturing low-level mV-range transducer outputs with programmable gain stage. Use Value: ±1 LSB INL preserves calibration integrity; 1.25V–5.05V VREF support enables adaptive full-scale scaling. | Use Scenario: Handheld multimeter or portable oscilloscope probe with USB-C power delivery. IC Role / Device Role / Timing Role: Low-power sampling ADC acquiring AC/DC voltage and current waveforms. Use Value: 20kHz sampling captures 5kHz fundamentals; 250µA current minimizes load on single-cell Li-ion battery. |
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 |
|---|---|---|---|
| ADS7822U-TI | 8-bit resolution, 200kHz sampling, 3V–5.5V supply, SPI-only interface | Higher speed but lower resolution; lacks differential input and no-missing-codes guarantee | Select when speed > resolution and cost sensitivity outweighs precision requirements. |
| MAX11131ASA+T-MAXIM | 12-bit, 500ksps, internal reference, 2.7V–3.6V supply, SPI interface | Higher speed and integrated reference, but incompatible supply voltage and no differential input | Choose for compact 3V systems needing faster throughput, not for 5V isolated designs. |
Compared with ADS7822U-TI and MAX11131ASA+T, the ADS1286U-TI uniquely balances 12-bit precision, differential input, micropower operation, and 5V-system compatibility - making it optimal for legacy industrial and remote sensing designs requiring proven reliability and minimal BOM complexity.
Availability
The ADS1286U-TI 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 ADS1286U-TI 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 ICs.
The ADS1286U-TI belongs to TI's legacy precision SAR ADC family, designed specifically for low-power, isolated, and remote measurement applications where reliability, low supply current, and simple serial interfacing are prioritized over ultra-high speed or integrated features.
FAQ
What is the maximum sampling rate supported by the ADS1286U-TI?
The ADS1286U-TI supports a maximum sampling rate of 20kHz, achieved when the DCLOCK frequency is set to 200kHz (fCLK = 16 × fSAMPLE). At this rate, conversion time is fixed at 12 clock cycles, and analog input acquisition requires 1.5–2.0 clock cycles. This specification is guaranteed across the full operating temperature range of –40°C to +85°C for the ADS1286U-TI variant.
Does the ADS1286U-TI require an external reference voltage?
Yes, the ADS1286U-TI requires an external reference voltage applied to the VREF pin (Pin 1). It accepts a reference range from 1.25V to 5.05V, with optimal performance at 5V. The device does not include an internal reference; reference input impedance exceeds 5MΩ when CS = VCC, enabling use with high-impedance sources like precision voltage references or resistor dividers.
How does the CS/SHDN pin function on the ADS1286U-TI?
The CS/SHDN pin (Pin 5) serves dual functions: when pulled LOW, it enables the ADC and initiates data transfer; when driven HIGH, it places the ADS1286U-TI into full shutdown mode, reducing supply current to 3µA. During shutdown, the bias circuit, comparator, and reference input become high-impedance. This pin must be driven rail-to-rail (GND/VCC) to avoid excess current draw from the input buffer.
What package type is used for the ADS1286U-TI?
The ADS1286U-TI is supplied in an 8-pin SOIC package (JEDEC MS-012, Package Drawing D), measuring 5.0mm × 6.2mm with 1.27mm lead pitch. It is RoHS-compliant with NiPdAu lead finish and rated for moisture sensitivity Level-2 (260°C, 1 year) or Level-3 (260°C, 168 hours), depending on the specific ordering option (e.g., ADS1286UA vs. ADS1286UC).
Can the ADS1286U-TI interface directly with a microcontroller using SPI?
Yes, the ADS1286U-TI supports SPI-compatible 3-wire serial communication using CS/SHDN, DCLOCK, and DOUT. Data is output LSB-first on the falling edge of DCLOCK, with one null bit preceding the 12-bit result. No additional level-shifting or protocol translation is needed for standard 5V CMOS microcontrollers, and timing parameters (e.g., tdDO = 85–150ns) ensure reliable capture with typical MCU GPIO interrupt or polling routines.
ADS1286U-TI Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Bulk
- 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:
- -
- 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:
- -
ADS1286U-TI FAQ
1.How can I place an order for ADS1286U-TI through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1286U-TI 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 ADS1286U-TI reliable?
The price and inventory of ADS1286U-TI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1286U-TI is usually 5 days.
3.What payment methods are accepted for ADS1286U-TI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1286U-TI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1286U-TI?
ADS1286U-TI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1286U-TI 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 ADS1286U-TI?
For technical support, including ADS1286U-TI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1286U-TI requirements.
6.How does Aetrix verify that ADS1286U-TI is sourced from the original manufacturer or authorized distributors?
All ADS1286U-TI 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 ADS1286U-TI meets industry standards.
7.What is the process for return or replacement of ADS1286U-TI?
All ADS1286U-TI units undergo pre-shipment inspection (PSI). If there is an issue with ADS1286U-TI, 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 ADS1286U-TI part is unused and in its original packaging.
Return procedure for ADS1286U-TI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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