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Texas Instruments ADS1286UA/2K5G4
- Part No.:
- ADS1286UA/2K5G4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS1286UA/2K5G4.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,647
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Product details
Overview
ADS1286UA/2K5G4 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, delivers ±2 LSB integral linearity over –40°C to +85°C, and targets isolated or remote data acquisition systems requiring micropower operation.
For engineers reviewing the ADS1286UA/2K5G4 datasheet, ADS1286UA/2K5G4 pinout, ADS1286UA/2K5G4 application, or ADS1286UA/2K5G4 equivalent, this page provides verified technical context, package mapping to SOIC-8, timing-critical interface behavior, real-world noise and linearity performance at varying reference voltages, and validated alternative options for industrial sensor interfacing.
Technical Context
The ADS1286UA/2K5G4 implements a successive approximation register (SAR) architecture with integrated sample-and-hold amplifier and CMOS-compatible digital interface. Its conversion time is fixed at 12 clock cycles, and sampling is synchronized via falling-edge-triggered DCLOCK with CS/SHDN-controlled initiation and automatic shutdown between conversions.
It supports both two-wire (CS + DCLOCK) and three-wire (CS + DCLOCK + DOUT) serial communication, outputs straight-binary 12-bit data LSB-first after one null bit, and maintains high-impedance DOUT when CS is high. Reference input accepts 1.25V–5.05V, and analog inputs tolerate –0.2V to VCC+0.2V with ≤25pF capacitance and ±1µA leakage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with guaranteed no missing codes. |
| Sampling Rate | 20 kHz maximum - enables real-time monitoring of fast-changing sensor signals in battery-powered systems. |
| Supply Current | 250 µA typical at 200 kHz clock - supports multi-year operation on coin-cell batteries in remote sensing nodes. |
| INL / DNL | ±2 LSB / ±1 LSB - ensures accurate representation of linear transducer outputs without calibration across full temperature range. |
| Reference Range | 1.25 V to VCC+0.05 V - allows flexible scaling from low-voltage sensors while maintaining 12-bit effective resolution. |
| Power Supply Rejection | 82 dB - suppresses ripple-induced errors in noisy industrial power rails without external filtering. |
| Operating Temperature | –40°C to +85°C - qualified for deployment in uncontrolled outdoor or factory-floor environments. |
Pinout & Package
ADS1286UA/2K5G4 is housed in an 8-lead SOIC (Package Drawing D), with lead finish unspecified per TI documentation and moisture sensitivity level MSL-2 (260°C peak reflow, 1 year floor life).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VREF | 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 signal up to VCC+0.2V; 25pF input capacitance affects RC filter design. |
| 3 | –In | Inverting analog input - used for true differential measurement or grounded for single-ended mode; ±1µA leakage impacts high-Z sources. |
| 4 | GND | Analog ground reference - must be separated from digital ground to preserve 72 dB SINAD and minimize noise coupling. |
| 5 | CS/SHDN | Chip select / shutdown control - active-low enables conversion; high state reduces supply current to 3 µA and disables DOUT. |
| 6 | DOUT | Serial data output - tri-state, LSB-first, valid on falling DCLOCK edge; enters high-impedance when CS is high. |
| 7 | DCLOCK | Data clock input - synchronizes all serial transfers; minimum cycle time 80 µs defines max 12.5 kHz sustained throughput. |
| 8 | +VCC | Positive supply - 4.5V–5.25V range; supplies internal bias, reference buffer, and logic; decoupling critical for 500 kHz small-signal bandwidth. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower serial ADC | 250 µA typical supply current enables >5-year battery life in 1 Hz sampling wireless sensor nodes. |
| Differential input with S/H | Rejects common-mode noise up to 82 dB and captures transient signals without external sample-hold circuitry. |
| SPI/SSI-compatible interface | Interoperates with standard microcontroller peripherals using only CS, DCLOCK, and DOUT-no custom logic required. |
| Guaranteed no missing codes | Ensures monotonic transfer function essential for closed-loop control and position feedback applications. |
| Auto-shutdown between conversions | Reduces average current proportionally to sample rate-e.g., ~20 µA at 1.6 kHz-without software intervention. |
Applications
| Remote Data Acquisition | Isolated Data Acquisition |
|---|---|
Use Scenario: Wireless environmental sensor node measuring temperature, humidity, and pressure in inaccessible locations such as utility substations or pipeline monitoring points. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from multiple transducers; initiates conversion on timer interrupt and transmits result via low-power RF link. Use Value: 250 µA quiescent current and 20 kHz sampling enable high-fidelity capture while extending battery life beyond 5 years at 10 Hz update rate. |
Use Scenario: High-voltage motor drive monitoring where analog signals from current shunts and thermistors must be isolated from 3.3V/5V logic domains. IC Role / Device Role / Timing Role: Isolated-side ADC converting differential sensor outputs; communicates across digital isolator using minimal two-wire serial interface. Use Value: Two-wire interface reduces isolator channel count; 25pF input capacitance minimizes loading on isolated op-amp outputs before digitization. |
| Transducer Interface | Battery-Operated Systems |
Use Scenario: Precision load cell or strain gauge readout in portable test equipment, requiring ratiometric measurement against stable reference. IC Role / Device Role / Timing Role: Ratiometric ADC accepting bridge excitation voltage as VREF; rejects supply variation and matches sensor sensitivity drift. Use Value: ±2 LSB INL and 500 kHz small-signal bandwidth preserve sub-0.1% accuracy in 1000:1 dynamic range weigh scale designs. |
Use Scenario: Handheld gas detector using electrochemical sensors with mV-level outputs and strict 10-year shelf-life requirements. IC Role / Device Role / Timing Role: Low-power ADC powering up only during periodic 100 ms measurement bursts; remains fully shut down otherwise. Use Value: 3 µA shutdown current prevents battery drain during storage; auto-shutdown eliminates firmware overhead for power state management. |
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 pinout; ±2 LSB INL but rated for –40°C to +85°C with NIPDAU lead finish. | Identical functional scope; differs only in RoHS-compliant surface finish and MSL-2 reflow profile. | Select ADS1286UB when lead-free assembly with standard JEDEC reflow is required and tube packaging suffices. |
| ADS1286UL/2K5 | SOIC-8 variant with ±1 LSB INL grade, same temperature range and tape-and-reel packaging (2500 pcs/reel). | Higher linearity enables metrology-grade measurements without post-calibration; identical footprint and interface. | Choose ADS1286UL/2K5 when system-level accuracy demands <±1 LSB error across full operating range. |
Compared with ADS1286UA/2K5G4, ADS1286UB offers identical electrical performance with a different surface finish for lead-free manufacturing, while ADS1286UL/2K5 delivers tighter ±1 LSB linearity at the same package and volume packaging-enabling higher-accuracy designs without layout changes.
Availability
ADS1286UA/2K5G4 is available at Aetrix Electronics and suitable for remote data acquisition, isolated sensor interfaces, and battery-operated instrumentation requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for ADS1286UA/2K5G4 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 ADS1286 series was designed specifically for low-power, high-accuracy sensor signal digitization in harsh environments-emphasizing micropower operation, robust serial interfacing, and guaranteed monotonicity for mission-critical measurement systems.
FAQ
What is the maximum sampling rate supported by the ADS1286UA/2K5G4?
The ADS1286UA/2K5G4 supports a maximum sampling rate of 20 kHz, achieved when the DCLOCK frequency is set to 200 kHz (12 clock cycles per conversion). At lower clock frequencies, the effective sampling rate scales linearly-for example, 125 kHz DCLOCK yields 10.4 kHz sampling. This rate is guaranteed across the full –40°C to +85°C operating range with VCC = 5 V and VREF = 5 V.
Does the ADS1286UA/2K5G4 require an external reference voltage?
Yes, the ADS1286UA/2K5G4 requires an external reference voltage applied to the VREF pin. It accepts 1.25 V to VCC+0.05 V, and the full-scale input range is defined as +In – (–In) = VREF. Internal reference is not provided; using a precision external reference (e.g., REF5025) ensures optimal INL and gain error performance, especially when operating at reduced VREF values.
How does the CS/SHDN pin control power states in the ADS1286UA/2K5G4?
The CS/SHDN pin serves dual functions: when pulled low, it enables conversion and serial data output; when driven high, it places the ADS1286UA/2K5G4 into full shutdown mode, reducing supply current to 3 µA and disabling DOUT. During active conversion, the device automatically powers down internal bias circuits and comparator between samples-further lowering average current proportional to sampling rate.
Can the ADS1286UA/2K5G4 interface directly with a standard SPI master?
Yes, the ADS1286UA/2K5G4 is SPI and SSI compatible. It uses a 3-wire interface (CS/SHDN, DCLOCK, DOUT) with data valid on the falling edge of DCLOCK and LSB-first transmission. No MOSI line is needed since it is output-only. Standard SPI controllers can drive it by configuring clock polarity/phase for falling-edge capture and managing CS timing per the 2-clock delay requirement before data becomes valid.
What is the meaning of "/2K5G4" in the ADS1286UA/2K5G4 part number?
The "/2K5G4" suffix indicates tape-and-reel packaging: 2500 units per reel (2K5), with G4 denoting TI's standard carrier tape specification for SOIC-8 devices-including sprocket hole pitch, cavity dimensions, and quadrant-1 pin-1 orientation. This packaging format is optimized for automated SMT placement and supports high-volume manufacturing without manual handling.
ADS1286UA/2K5G4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Discontinued at Digi-Key
- 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/2K5G4 FAQ
1.How can I place an order for ADS1286UA/2K5G4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1286UA/2K5G4 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/2K5G4 reliable?
The price and inventory of ADS1286UA/2K5G4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1286UA/2K5G4 is usually 5 days.
3.What payment methods are accepted for ADS1286UA/2K5G4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1286UA/2K5G4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1286UA/2K5G4?
ADS1286UA/2K5G4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1286UA/2K5G4 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/2K5G4?
For technical support, including ADS1286UA/2K5G4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1286UA/2K5G4 requirements.
6.How does Aetrix verify that ADS1286UA/2K5G4 is sourced from the original manufacturer or authorized distributors?
All ADS1286UA/2K5G4 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/2K5G4 meets industry standards.
7.What is the process for return or replacement of ADS1286UA/2K5G4?
All ADS1286UA/2K5G4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1286UA/2K5G4, 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/2K5G4 part is unused and in its original packaging.
Return procedure for ADS1286UA/2K5G4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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