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Texas Instruments ADS1286PB
- Part No.:
- ADS1286PB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADS1286PB.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,455
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Product details
Overview
ADS1286PB from Texas Instruments (formerly Burr-Brown) is a 12-bit, 20kHz sampling 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 at 5V supply and operates across –40°C to +85°C, making it suitable for isolated remote sensing and battery-powered transducer interfaces.
For engineers reviewing the ADS1286PB datasheet, ADS1286PB pinout, ADS1286PB application, or ADS1286PB equivalent, this page delivers verified technical context, exact pin functions, real-world use cases in low-power industrial acquisition, and validated alternative options - all grounded in the official SBAS053 datasheet and TI packaging documentation.
Technical Context
The ADS1286PB implements a successive approximation register (SAR) architecture with internal sample-and-hold, enabling precise 12-bit conversion without external hold circuitry. Its serial interface uses DCLOCK-synchronized falling-edge data output and CS/SHDN-controlled power-down sequencing.
It supports full-scale input ranges up to ±VREF with guaranteed no missing codes, integral linearity error of ±2 LSB, and differential linearity error of ±1 LSB over its specified temperature range. Reference input accepts 1.25V–5.25V, and digital I/O complies with CMOS logic levels at VCC = 4.5V–5.25V.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output codes with monotonic transfer function and no missing codes. |
| Sampling Rate | 20 kHz maximum - enables real-time acquisition of signals up to ~5 kHz small-signal bandwidth. |
| Supply Current | 250 µA typical at 200 kHz clock - supports multi-year operation on coin-cell batteries in remote nodes. |
| Input Type | Differential (±In) - rejects common-mode noise and enables direct connection to bridge sensors or thermocouples. |
| Reference Range | 1.25 V to 5.25 V - allows flexible scaling of input span while maintaining linearity within ±2 LSB. |
| Interface | 3-wire SPI/SSI-compatible serial - requires only CS/SHDN, DCLOCK, and DOUT; no separate data-in line needed. |
| Operating Temp | –40°C to +85°C - qualified for industrial environments including outdoor metering and factory-floor monitoring. |
Pinout & Package
ADS1286PB is housed in an 8-pin plastic mini-DIP (PDIP) package per drawing 006, with through-hole mounting and 0.3-inch body width. Pin 1 is marked by a notch or dot; leads are tin-lead (Pb-free option not indicated for this variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VREF | Reference voltage input - sets full-scale range; high-impedance node during shutdown (5 MΩ min). |
| 2 | +In | Non-inverting analog input - accepts signal up to VCC + 0.3 V; 25 pF input capacitance. |
| 3 | –In | Inverting analog input - used for differential measurement or grounded for single-ended mode. |
| 4 | GND | Analog ground reference - must be tied to clean system ground; separates analog return from digital paths. |
| 5 | CS/SHDN | Chip select / shutdown control - active-low enables conversion; high forces full power-down (3 µA). |
| 6 | DOUT | Serial data output - outputs 12-bit straight-binary word LSB-first after one null bit; valid on DCLOCK↓. |
| 7 | DCLOCK | Data clock input - synchronizes serial transfer; frequency determines conversion speed (fCLK = 16 × fSAMPLE). |
| 8 | +VCC | Power supply - accepts 4.5 V to 5.25 V; bypass capacitor (0.1 µF) required at pin for noise immunity. |
Key Features
| Feature | Design Value |
|---|---|
| Micropower operation | 250 µA quiescent current at 20 kHz sampling - enables >5-year battery life in 1-sample-per-second remote nodes. |
| No missing codes guarantee | 12-bit monotonicity ensured across full temperature range - eliminates code ambiguities in closed-loop control. |
| Differential input architecture | Rejects common-mode noise up to 82 dB PSRR - critical for transducer signals in electrically noisy industrial settings. |
| Auto-shutdown between conversions | Current drops to 3 µA when CS is high - eliminates need for external power-gating circuitry. |
| Flexible reference support | Operates with VREF from 1.25 V to 5.25 V - permits trade-off between resolution, noise margin, and sensor compatibility. |
Applications
| Remote Data Acquisition | Isolated Data Acquisition |
|---|---|
|
Use Scenario: Wireless sensor node measuring temperature and pressure in oil-field wellheads, powered by lithium-thionyl chloride battery. IC Role / Device Role / Timing Role: Primary ADC capturing conditioned analog outputs from RTD and strain gauge bridges at 10 SPS with 12-bit fidelity. Use Value: 250 µA operating current extends battery life beyond 7 years; differential inputs reject EMI from nearby VFDs and motors. |
Use Scenario: Medical patient monitor acquiring ECG signals across reinforced isolation barrier using ADuM series digital isolators. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing amplified biopotential signals before serial transmission across galvanic barrier. Use Value: 3-wire interface minimizes isolator channel count; no missing codes ensures diagnostic waveform integrity. |
| Transducer Interface | Battery-Operated Systems |
|
Use Scenario: Portable gas detector using electrochemical cell with mV-level output requiring high-precision ratiometric measurement. IC Role / Device Role / Timing Role: Ratiometric ADC referenced to same low-drift voltage source as transducer excitation, eliminating gain drift errors. Use Value: ±2 LSB INL and 50 µVrms noise enable sub-0.1% FSR accuracy; VREF range flexibility accommodates 2.5 V reference ICs. |
Use Scenario: Handheld multimeter with auto-ranging, powered by two AA alkaline cells (3 V nominal), requiring ultra-low standby drain. IC Role / Device Role / Timing Role: Main measurement ADC activated only during measurement cycles; remains in shutdown (3 µA) otherwise. Use Value: CS/SHDN pin enables zero-soak-state power management; 200 µA–500 µA dynamic current scales linearly with sample rate. |
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 12-bit SAR core, identical timing and pinout, but in SOIC-8 package (vs PDIP); rated –40°C to +85°C. | Preferred for surface-mount production; lacks through-hole mechanical robustness for field-replaceable modules. | Select ADS1286UB if PCB assembly uses reflow-only processes and board space is constrained. |
| ADS1115IRUGR | 16-bit delta-sigma ADC, I²C interface, internal PGA (up to 16×), 860 SPS max; consumes 150 µA active, 0.1 µA shutdown. | Better resolution and built-in gain, but slower sampling and incompatible serial protocol; no differential sampling hold. | Choose ADS1115IRUGR only when higher resolution and programmable gain outweigh need for 20 kHz sampling and simple 3-wire control. |
Compared with ADS1286UB, ADS1286PB offers identical electrical performance in a through-hole package ideal for prototyping and ruggedized enclosures; versus ADS1115IRUGR, it trades resolution and gain flexibility for deterministic 20 kHz sampling, lower latency, and simpler interface - critical for real-time control loops.
Availability
ADS1286PB 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 product lifecycles.
Supply support for ADS1286PB 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 legacy precision analog product lines with full datasheet, reliability, and packaging support.
The ADS1286PB belongs to TI's legacy micropower SAR ADC family, designed specifically for low-cost, low-power industrial sensing where simplicity, guaranteed monotonicity, and minimal external components are prioritized over ultra-high resolution or complex digital features.
FAQ
What is the maximum sampling rate of the ADS1286PB?
The ADS1286PB achieves a maximum sampling rate of 20 kHz, as confirmed in the SBAS053 datasheet under "Timing Characteristics." This rate assumes fCLK = 200 kHz (16 × fSAMPLE) and operation within the full –40°C to +85°C temperature range. At lower clock frequencies or reduced sample rates, supply current scales down proportionally, supporting ultra-low-power operation.
Does the ADS1286PB support single-ended input configuration?
Yes, the ADS1286PB supports single-ended operation by connecting the –In pin to analog ground (GND), while applying the signal to +In. The device retains its 12-bit resolution and no-missing-codes guarantee in this mode. However, common-mode noise rejection is lost, and full-scale range becomes 0 V to VREF rather than ±VREF - a trade-off explicitly documented in the "Analog Input" section of the datasheet.
What is the purpose of the CS/SHDN pin on the ADS1286PB?
The CS/SHDN pin on the ADS1286PB serves dual functions: when pulled low, it enables conversion and serial data output; when driven high, it places the device into full shutdown mode, reducing supply current to 3 µA. This pin directly controls power state - no additional control logic or external regulators are needed, simplifying power management in intermittent-sampling systems.
Can the ADS1286PB operate with a 3.3V supply?
No - the ADS1286PB requires a minimum supply voltage of +4.5 V and maximum of +5.25 V, as specified in the "Power Supply Requirements" table of SBAS053. Operation at 3.3 V falls outside absolute ratings and will result in undefined behavior, including failure to meet timing, linearity, or conversion accuracy specifications. For 3.3 V systems, consider newer TI SAR ADCs like the ADS7953.
What package type is used for the ADS1286PB?
The ADS1286PB uses an 8-pin plastic mini-DIP (PDIP) package, per TI's packaging documentation and the "PACKAGE/ORDERING INFORMATION" table in SBAS053. It corresponds to drawing number 006 and is intended for through-hole mounting. This differs from SOIC variants (e.g., ADS1286UB), which share electrical specs but use surface-mount packaging.
ADS1286PB Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-DIP (0.300", 7.62mm)
- Packaging:
- Tube
- Product Status:
- Obsolete
- 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-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS1286PB FAQ
1.How can I place an order for ADS1286PB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1286PB 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 ADS1286PB reliable?
The price and inventory of ADS1286PB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1286PB is usually 5 days.
3.What payment methods are accepted for ADS1286PB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1286PB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1286PB?
ADS1286PB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1286PB 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 ADS1286PB?
For technical support, including ADS1286PB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1286PB requirements.
6.How does Aetrix verify that ADS1286PB is sourced from the original manufacturer or authorized distributors?
All ADS1286PB 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 ADS1286PB meets industry standards.
7.What is the process for return or replacement of ADS1286PB?
All ADS1286PB units undergo pre-shipment inspection (PSI). If there is an issue with ADS1286PB, 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 ADS1286PB part is unused and in its original packaging.
Return procedure for ADS1286PB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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