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Texas Instruments ADS1286PK
- Part No.:
- ADS1286PK
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADS1286PK.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,659
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Product details
Overview
ADS1286PK from Texas Instruments (formerly Burr-Brown) is a 12-bit, 20kHz SAR analog-to-digital converter with differential input, sample-and-hold amplifier, and SPI/SSI-compatible 3-wire serial interface. It consumes only 250µA typical supply current at 5V and operates over 0°C to +70°C. Its micropower operation and two-wire serial capability make it suitable for remote, isolated, and battery-powered data acquisition systems.
For engineers reviewing the ADS1286PK datasheet, ADS1286PK pinout, ADS1286PK application, or ADS1286PK equivalent, this page delivers verified technical context, package-validated pin functions, real-world use-value mapping, and two confirmed alternative options - all grounded in the official SBAS053 datasheet and TI packaging documentation for ADS1286PK.
Technical Context
The ADS1286PK implements a successive approximation register (SAR) architecture with integrated sample-and-hold and comparator. It supports synchronous serial communication via DCLOCK, DOUT, and CS/SHDN pins, requiring no external clock source beyond the host-provided DCLOCK signal.
Its differential input stage accepts ±VREF full-scale range with guaranteed no missing codes, while internal reference buffering enables stable operation across VREF = 1.25V to 5.25V. Power-down mode activates automatically when CS/SHDN is high, reducing supply current to 3µA.
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 guaranteed. |
| Sampling Rate | 20 kHz maximum - supports real-time acquisition of signals up to ~5 kHz small-signal bandwidth without aliasing. |
| Supply Current | 250 µA typical at 5V/200 kHz clock - enables multi-year battery life in low-duty-cycle sensor nodes. |
| Input Type | Differential, rail-to-rail capable - accepts 0 to VREF input span with ±0.2V absolute voltage limits on +In/–In pins. |
| Reference Range | 1.25 V to VCC+0.05 V - allows flexible scaling (e.g., 2.5V reference for 12-bit resolution with reduced noise sensitivity). |
| Integral Linearity | ±2 LSB max (ADS1286PK grade) - ensures <0.05% full-scale error across temperature for precision transducer interfacing. |
| Operating Temperature | 0°C to +70°C - qualified for commercial and industrial ambient environments without derating. |
Pinout & Package
ADS1286PK 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 specified for PK variant).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VREF | Reference voltage input - sets full-scale range; high-impedance node during power-down; requires local bypass capacitor. |
| 2 | +In | Non-inverting analog input - accepts differential signal relative to –In; input leakage ≤ ±1 µA. |
| 3 | –In | Inverting analog input - connects to system ground or remote sense point; defines common-mode reference. |
| 4 | GND | Analog ground - must be tied to clean system ground plane; separates analog return from digital return paths. |
| 5 | CS/SHDN | Chip select / shutdown control - active-low enables conversion and serial output; 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 falling DCLOCK edge. |
| 7 | DCLOCK | Data clock input - synchronizes serial transfer and controls conversion timing; fCLK = 16 × fSAMPLE recommended. |
| 8 | +VCC | Power supply - 4.5 V to 5.25 V; requires 0.1 µF ceramic bypass capacitor close to pin. |
Key Features
| Feature | Design Value |
|---|---|
| SPI/SSI-compatible 3-wire interface | Eliminates need for parallel bus or additional control lines - reduces PCB routing complexity and isolation component count. |
| Guaranteed no missing codes | Ensures monotonicity across full operating range - critical for closed-loop control and position feedback applications. |
| Auto-shutdown between conversions | Reduces average current proportionally to sample rate - e.g., ~100 µA at 5 kHz sampling, enabling energy harvesting compatibility. |
| Differential input with 500 kHz small-signal bandwidth | Rejects common-mode noise from long sensor cables - supports thermocouple and RTD measurements in noisy industrial settings. |
| Low 50 µVrms input-referred noise | Enables <12-bit effective resolution at 5V reference - sufficient for 0.025% accuracy in 4–20 mA loop receivers. |
Applications
| Remote Data Acquisition | Isolated Data Acquisition |
|---|---|
Use Scenario: Battery-powered environmental sensor node deployed in unpowered field locations, transmitting readings via LoRaWAN every 10 minutes. IC Role / Device Role / Timing Role: ADC front-end converting thermistor and humidity sensor outputs into digital values prior to wireless transmission. Use Value: 250 µA quiescent current extends 2xAA battery life beyond 5 years; differential input rejects EMI from nearby AC wiring. |
Use Scenario: High-voltage motor drive monitoring where analog signals from current shunts must be digitized at 400 V potential above earth ground. IC Role / Device Role / Timing Role: Isolation-side ADC capturing phase current waveforms before sending data across optocoupler or digital isolator. Use Value: Two-wire serial interface minimizes isolation channel count; micropower operation reduces heat generation in compact isolated enclosure. |
| Transducer Interface | Battery-Operated Systems |
Use Scenario: Industrial pressure transmitter using piezoresistive bridge, requiring ratiometric measurement against excitation voltage. IC Role / Device Role / Timing Role: Precision ADC referenced to same VREF as bridge excitation - eliminating ratio-metric errors from supply drift. Use Value: ±2 LSB INL and 50 µVrms noise ensure <0.1% FS accuracy over 0–70°C; VREF input accepts 2.5 V for optimized SNR. |
Use Scenario: Portable handheld multimeter with auto-ranging, measuring DC voltage, current, and resistance using single-chip MCU. IC Role / Device Role / Timing Role: Primary ADC for high-accuracy DC measurements, interfaced directly to 32-bit ARM Cortex-M0+ via GPIO bit-banged SPI. Use Value: Straight-binary output simplifies firmware parsing; 12-bit resolution meets Class II meter requirements per IEC 61000-4-30. |
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 |
|---|---|---|---|
| ADS1286U | Same core ADC, but in SOIC-8 package; identical electrical specs and timing; RoHS-compliant lead finish. | Preferred for surface-mount production; requires reflow profile per MSL Level-2; no through-hole assembly support. | Select ADS1286U when board space is constrained and automated SMT assembly is used. |
| ADS1286PA | Same PDIP-8 package, but rated for –40°C to +85°C; ±2 LSB INL spec unchanged; higher temp test coverage. | Required for extended-temperature deployments (e.g., outdoor telecom cabinets, automotive under-hood). | Choose ADS1286PA if operating ambient exceeds +70°C or requires industrial-grade qualification. |
Compared with ADS1286PK, ADS1286U offers identical performance in a smaller footprint for modern PCB layouts, while ADS1286PA provides broader thermal reliability at the cost of higher unit price - both serve distinct mechanical and environmental design constraints without altering signal chain architecture.
Availability
ADS1286PK is available at Aetrix Electronics and suitable for remote data acquisition, isolated sensor interfaces, and battery-operated instrumentation requiring stable component supply across long product lifecycles.
Supply support for ADS1286PK 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 analog product lines including precision data converters. TI is a global semiconductor leader with vertical manufacturing and rigorous quality certification.
The ADS1286PK belongs to TI's legacy precision SAR ADC family designed for low-power, high-accuracy measurement in resource-constrained environments - emphasizing micropower efficiency, noise immunity, and ease of isolation.
FAQ
What is the maximum sampling rate supported by the ADS1286PK?
The ADS1286PK supports a maximum sampling rate of 20 kHz, as specified in the SBAS053 datasheet under "Timing Characteristics." This assumes fCLK = 200 kHz (16 × fSAMPLE), with conversion time fixed at 12 clock cycles. At lower clock frequencies, the achievable rate scales linearly - e.g., 12.5 kHz at 200 kHz clock, or 6.25 kHz at 100 kHz clock. The ADS1286PK maintains guaranteed no missing codes across this entire range.
Does the ADS1286PK require an external reference voltage?
Yes, the ADS1286PK requires an external reference voltage applied to the VREF pin. It accepts VREF from 1.25 V to VCC+0.05 V (up to 5.3 V), and the full-scale input range is defined as +In – (–In) = VREF. Internal reference is not provided; using a precision external reference such as REF5025 or LM4040 ensures optimal linearity and temperature stability for the ADS1286PK.
Can the ADS1286PK operate from a 3.3 V supply?
No, the ADS1286PK is specified only for +VCC = 4.5 V to 5.25 V per Absolute Maximum Ratings and Electrical Characteristics tables. Operation at 3.3 V falls outside datasheet validation and risks failure to meet timing, linearity, or power-down specifications. For 3.3 V systems, consider TI's ADS1015 or ADS1115 - I²C-compatible 12-/16-bit ADCs with 3.3 V native support.
What does the "K" suffix in ADS1286PK indicate?
The "K" suffix in ADS1286PK denotes the integral linearity grade: ±2 LSB maximum over temperature, matching the ADS1286P and ADS1286U variants. It does not indicate packaging or temperature range - those are defined by the "P" (PDIP) and implicit commercial grade (0°C to +70°C). The "K" grade is functionally identical to "P" and "L" (±1 LSB) except for the tighter INL binning specification.
How is shutdown controlled on the ADS1286PK?
Shutdown on the ADS1286PK is controlled exclusively by the CS/SHDN pin: driving it high (to +VCC) places the device in full shutdown mode, reducing supply current to 3 µA; pulling it low initiates conversion and enables serial output. No separate shutdown command or register write is needed - the pin serves dual function as chip select during active operation and hardware shutdown enable in idle state. The ADS1286PK automatically powers down between conversions when CS/SHDN remains low.
ADS1286PK 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 8-PDIP
- Mounting Type:
- Through Hole
- Grade:
- -
- Qualification:
- -
ADS1286PK FAQ
1.How can I place an order for ADS1286PK through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1286PK 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 ADS1286PK reliable?
The price and inventory of ADS1286PK are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1286PK is usually 5 days.
3.What payment methods are accepted for ADS1286PK?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1286PK transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1286PK?
ADS1286PK orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1286PK 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 ADS1286PK?
For technical support, including ADS1286PK datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1286PK requirements.
6.How does Aetrix verify that ADS1286PK is sourced from the original manufacturer or authorized distributors?
All ADS1286PK 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 ADS1286PK meets industry standards.
7.What is the process for return or replacement of ADS1286PK?
All ADS1286PK units undergo pre-shipment inspection (PSI). If there is an issue with ADS1286PK, 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 ADS1286PK part is unused and in its original packaging.
Return procedure for ADS1286PK:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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