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Texas Instruments ADS1286UA/2K5
- Part No.:
- ADS1286UA/2K5
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS1286UA/2K5.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,586
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Product details
Overview
ADS1286UA/2K5 from Texas Instruments (formerly Burr-Brown) is a 12-bit, 20kHz SAR analog-to-digital converter with differential input, integrated sample-and-hold amplifier, and SPI/SSI-compatible 3-wire serial interface. It consumes only 250µA typical supply current at 5V and operates across –40°C to +85°C. Its micropower operation and two-wire serial capability make it ideal for isolated, remote, or battery-powered data acquisition systems.
For engineers reviewing the ADS1286UA/2K5 datasheet, ADS1286UA/2K5 pinout, ADS1286UA/2K5 application, or ADS1286UA/2K5 equivalent, key selection considerations include guaranteed no-missing-codes performance, ±2 LSB integral linearity over industrial temperature range, SOIC-8 package compatibility, low-noise 500 kHz small-signal bandwidth, and shutdown mode reducing current to 3 µA.
Technical Context
The ADS1286UA/2K5 implements a successive approximation register (SAR) architecture with internal sample-and-hold, enabling precise DC and low-frequency AC measurements. Its serial interface uses DCLOCK-synchronized falling-edge data output and CS/SHDN-controlled conversion initiation and power-down sequencing.
It supports flexible reference voltage operation from 1.25 V to 5.25 V, with input leakage ≤±1 µA and 500 MΩ reference input resistance when CS = VCC. Conversion time is fixed at 12 clock cycles, and sampling rate scales linearly with clock frequency up to 20 kHz maximum.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with guaranteed no missing codes. |
| Max Sampling Rate | 20 kHz - enables real-time monitoring of signals up to ~5 kHz Nyquist bandwidth. |
| Supply Current | 250 µA typical at 5 V - supports multi-year battery life in low-duty-cycle remote sensors. |
| Integral Linearity | ±2 LSB (ADS1286UA grade) - ensures <0.05% full-scale error for precision transducer interfacing. |
| Reference Range | 1.25 V to VCC+0.05 V - allows scaling resolution for sub-1 V sensor outputs without external amplification. |
| Power-Down Current | 3 µA - reduces system idle power by >98% during inter-conversion intervals. |
| Small-Signal BW | 500 kHz - preserves signal integrity for anti-aliasing filter design with margin. |
Pinout & Package
ADS1286UA/2K5 is housed in an 8-pin SOIC (D) package with standard 1.27 mm pitch and RoHS-compliant lead finish. Pin 1 orientation follows quadrant Q1 per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VREF | Reference Input | Accepts external reference voltage (1.25–5.25 V); high-impedance node during shutdown. |
| +In | Non-inverting Analog Input | Differential input terminal; supports rail-to-rail common-mode range from –0.2 V to VCC+0.2 V. |
| –In | Inverting Analog Input | Differential input terminal; connects to remote ground or sensor return for noise rejection. |
| GND | Analog Ground | Primary reference for analog circuitry; must be separated from digital ground in mixed-signal layouts. |
| CS/SHDN | Chip Select / Shutdown Control | Active-low conversion trigger; high-level forces full shutdown (3 µA quiescent). |
| DOUT | Serial Data Output | MSB-first 12-bit output valid on falling DCLOCK edge; tri-states when CS high. |
| DCLOCK | Data Clock Input | Synchronizes serial transfer; conversion speed determined by fCLK = 16 × fSAMPLE. |
| +VCC | Power Supply | Single 4.5–5.25 V supply powers analog and digital sections; bypass capacitor required. |
Key Features
| Feature | Design Value |
|---|---|
| SPI/SSI-Compatible Interface | 3-wire synchronous serial protocol eliminates need for parallel bus routing and reduces PCB trace count. |
| No Missing Codes Guaranteed | Ensures monotonicity across full 12-bit range-critical for closed-loop control and position feedback systems. |
| Auto-Power-Down Between Conversions | Current drops to 3 µA between samples, enabling ultra-low average power in burst-mode acquisition. |
| Differential Input with 500 kHz Bandwidth | Rejects common-mode noise while preserving fast step response for dynamic sensor signals. |
| Industrial Temperature Range (–40°C to +85°C) | Validated performance across extended ambient conditions-suitable for outdoor or uncontrolled environments. |
Applications
| Remote Data Acquisition | Isolated Data Acquisition |
|---|---|
Use Scenario: Wireless sensor nodes measuring temperature, pressure, or strain in inaccessible infrastructure (e.g., pipelines, wind turbine nacelles). IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog sensor outputs before RF transmission. Use Value: 250 µA operating current extends battery life to years; 20 kHz sampling captures transient events without oversampling penalty. | Use Scenario: Medical patient monitors requiring galvanic isolation between sensor front-end and host processor. IC Role / Device Role / Timing Role: Isolated-side ADC converting biopotential signals prior to optocoupler or digital isolator transmission. Use Value: Two-wire serial interface minimizes isolation channel count; differential input rejects common-mode interference from switching power supplies. |
| Transducer Interface | Battery-Operated Systems |
Use Scenario: Load cell or RTD-based weighing scale with microcontroller-based signal processing. IC Role / Device Role / Timing Role: High-linearity ADC interfacing bridge sensors with programmable gain instrumentation amplifiers. Use Value: ±2 LSB integral linearity ensures <0.05% measurement accuracy; flexible VREF support enables direct ratiometric scaling with excitation voltage. | Use Scenario: Portable gas detector using electrochemical sensors with low-output mV-level signals. IC Role / Device Role / Timing Role: Low-power ADC acquiring baseline-corrected sensor voltage during periodic wake-up cycles. Use Value: 3 µA shutdown current prevents battery drain during sleep; 12-bit resolution resolves sub-millivolt changes critical for ppm-level detection. |
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 lead finish and MSL rating (Level-2 vs Level-2-260C-1 YEAR). | Select ADS1286UB if lead-finish compliance (e.g., NIPDAU) or specific MSL handling is required. |
| ADS1286UL/2K5 | SOIC-8 variant with ±1 LSB integral linearity grade; otherwise identical electrical specs and timing. | Higher linearity enables tighter measurement tolerances in metrology-grade instruments. | Choose ADS1286UL/2K5 when <±1 LSB INL is mandatory for calibration-critical applications. |
Compared with ADS1286UB and ADS1286UL/2K5, the ADS1286UA/2K5 provides the optimal balance of industrial-grade temperature performance, RoHS compliance, and cost-effective tape-and-reel packaging for high-volume embedded designs-without sacrificing guaranteed no-missing-codes behavior or 20 kHz throughput.
Availability
ADS1286UA/2K5 is available at Aetrix Electronics and suitable for remote data acquisition, isolated sensor interfaces, and battery-operated instrumentation requiring stable component supply across long production lifecycles.
Supply support for ADS1286UA/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 acquired Burr-Brown in 2000 and maintains its precision analog product lines with focus on high-performance data converters, amplifiers, and interface ICs.
The ADS1286 series was designed specifically for low-power, isolated, and remote analog sensing applications-emphasizing micropower operation, serial simplicity, and robust industrial temperature performance.
FAQ
What is the maximum sampling rate supported by the ADS1286UA/2K5?
The ADS1286UA/2K5 supports a maximum sampling rate of 20 kHz, as specified in the datasheet under "Maximum Sampling Frequency" with fCLK = 200 kHz. This rate is achievable with proper clock timing and stable reference voltage. At this rate, the device delivers full 12-bit resolution with guaranteed no missing codes and maintains ±2 LSB integral linearity across the –40°C to +85°C operating range. The ADS1286UA/2K5 achieves this while drawing only 250 µA typical supply current.
Does the ADS1286UA/2K5 require an external reference voltage?
Yes, the ADS1286UA/2K5 requires an external reference voltage applied to the VREF pin. It accepts references from 1.25 V to VCC+0.05 V (up to 5.3 V), supporting ratiometric or absolute measurement configurations. The reference input exhibits 500 MΩ impedance when CS = VCC and draws only 0.01–20 µA depending on clock frequency and cycle time. The ADS1286UA/2K5 does not include an internal reference; accurate system-level voltage referencing must be provided externally.
What is the function of the CS/SHDN pin on the ADS1286UA/2K5?
The CS/SHDN pin on the ADS1286UA/2K5 serves dual functions: it acts as Chip Select (active-low) to initiate conversion and serial data output, and as Shutdown control (high-level) to reduce supply current to 3 µA. When pulled high, the bias circuit, comparator, and reference input enter high-impedance state. When pulled low, the device powers up, samples the analog inputs, and outputs 12-bit data on DOUT synchronized to DCLOCK. The ADS1286UA/2K5's auto-shutdown feature ensures minimal current draw between conversions even if CS remains low.
Can the ADS1286UA/2K5 interface directly with a microcontroller SPI port?
Yes, the ADS1286UA/2K5 is SPI- and SSI-compatible and can interface directly with standard microcontroller SPI hardware using three wires: DCLOCK (SCLK), DOUT (MISO), and CS/SHDN (SS). It outputs MSB-first 12-bit data on the falling edge of DCLOCK, with one null bit preceding valid data. No additional level-shifting or protocol translation is needed for 5 V-tolerant MCU ports. The ADS1286UA/2K5 operates with CMOS logic levels (VIH ≥ 3 V, VIL ≤ 0.8 V at 5 V supply), matching most legacy and modern microcontrollers.
What package type and reel quantity does the ADS1286UA/2K5 use?
The ADS1286UA/2K5 is supplied in an 8-pin SOIC (D) package with standard 1.27 mm pitch and RoHS-compliant lead finish. It ships in large tape-and-reel format with 2500 units per reel (SPQ = 2500), reel diameter 330 mm, and reel width 12.4 mm. Pin 1 orientation follows quadrant Q1 per JEDEC standards. This packaging supports automated SMT assembly and is optimized for high-volume manufacturing-distinct from the 75-unit tube packaging used for ADS1286UA.
ADS1286UA/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:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-SOIC
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
ADS1286UA/2K5 FAQ
1.How can I place an order for ADS1286UA/2K5 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1286UA/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 ADS1286UA/2K5 reliable?
The price and inventory of ADS1286UA/2K5 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1286UA/2K5 is usually 5 days.
3.What payment methods are accepted for ADS1286UA/2K5?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1286UA/2K5 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1286UA/2K5?
ADS1286UA/2K5 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1286UA/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 ADS1286UA/2K5?
For technical support, including ADS1286UA/2K5 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1286UA/2K5 requirements.
6.How does Aetrix verify that ADS1286UA/2K5 is sourced from the original manufacturer or authorized distributors?
All ADS1286UA/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 ADS1286UA/2K5 meets industry standards.
7.What is the process for return or replacement of ADS1286UA/2K5?
All ADS1286UA/2K5 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1286UA/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 ADS1286UA/2K5 part is unused and in its original packaging.
Return procedure for ADS1286UA/2K5:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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