My Inquiry
My Account
Texas Instruments ADS1286UB
- Part No.:
- ADS1286UB
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS1286UB.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,448
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
ADS1286UB 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 draws only 250µA at 5V supply and operates across –40°C to +85°C, making it suitable for isolated, remote, or battery-powered data acquisition systems.
For engineers reviewing the ADS1286UB datasheet, ADS1286UB pinout, ADS1286UB application, or ADS1286UB equivalent, this page delivers verified technical context, package-validated pin functions, real-world use-value per application, and two confirmed alternative parts with documented functional and thermal differences.
Technical Context
The ADS1286UB implements a successive approximation register (SAR) architecture with internal sample-and-hold and comparator, enabling precise 12-bit conversion without external support circuitry. Its serial interface uses DCLOCK-synchronized falling-edge data output and CS/SHDN-controlled power-down mode.
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 impedance exceeds 5 MΩ, and power supply rejection is 82 dB at DC.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output levels for high-fidelity sensor digitization |
| Sampling Rate | 20 kHz - enables real-time capture of audio-band and industrial control signals |
| Supply Current | 250 µA at 5 V - supports multi-year operation on coin-cell batteries in low-duty-cycle systems |
| Input Type | Differential - rejects common-mode noise in noisy industrial or transducer environments |
| Reference Range | 1.25 V to 5.25 V - allows flexible scaling for precision measurement with external references |
| Linearity Error | ±2 LSB integral, ±1 LSB differential - ensures monotonicity and minimal code-dependent gain variation |
| Operating Temp | –40°C to +85°C - qualified for automotive under-hood, industrial PLC, and outdoor monitoring use |
Pinout & Package
ADS1286UB is housed in an 8-pin SOIC (D) package with 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and moisture sensitivity level MSL-2 (260°C peak reflow).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 VREF | Reference voltage input | High-impedance node (≥5 MΩ); sets full-scale range; accepts 1.25–5.25 V |
| 2 +In | Non-inverting analog input | Differential input terminal; supports rail-to-rail common-mode range up to VCC |
| 3 –In | Inverting analog input | Differential input terminal; connects to remote ground or sensor return for noise rejection |
| 4 GND | Analog/digital ground reference | Single ground plane required; decoupling capacitor must be placed adjacent to pin |
| 5 CS/SHDN | Chip select / shutdown control | Active-low CS initiates conversion; logic-high forces full shutdown (3 µA quiescent) |
| 6 DOUT | Serial data output | CMOS-compatible; outputs 12-bit straight-binary word after one null bit on falling DCLOCK edges |
| 7 DCLOCK | Serial interface clock input | Synchronizes data transfer; minimum cycle time 80 µs (200 kHz max clock) |
| 8 +VCC | Power supply | 4.5–5.25 V operation; bypassing with 0.1 µF ceramic capacitor mandatory at pin |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes guarantee | Ensures monotonic response across full 12-bit range-critical for closed-loop control feedback |
| Auto-shutdown between conversions | Reduces average current proportionally to sample rate; enables ultra-low-power duty-cycled operation |
| SPI/SSI-compatible 3-wire interface | Minimizes PCB routing complexity and isolation barrier component count in remote sensing designs |
| Low input leakage (±1 µA) | Preserves accuracy when interfacing high-impedance sources like thermocouples or RTDs |
| 82 dB PSRR | Rejects supply ripple up to 10 kHz-reduces need for ultra-clean LDOs in mixed-signal systems |
Applications
| Remote Data Acquisition | Isolated Data Acquisition |
|---|---|
Use Scenario: Wireless sensor nodes measuring temperature, pressure, or strain in inaccessible locations (e.g., utility transformers, wind turbine nacelles). IC Role / Device Role / Timing Role: Primary ADC capturing conditioned analog signals; converts at 1–20 kHz with microcontroller-triggered CS pulses. Use Value: 250 µA typical supply current extends battery life beyond 5 years at 10 Hz sampling; SOIC package enables compact PCB layout. |
Use Scenario: High-voltage motor drive monitoring where analog inputs are galvanically isolated via optocouplers or digital isolators. IC Role / Device Role / Timing Role: Isolated-side ADC digitizing current/voltage feedback; communicates via isolated SPI bus using DCLOCK and DOUT. Use Value: 3-wire interface reduces isolation channel count by one versus 4-wire protocols; differential input rejects ground loop noise across isolation barrier. |
| Transducer Interface | Battery-Operated Systems |
Use Scenario: Industrial load cell or piezoresistive pressure sensor interfacing with 0–10 mV full-scale output. IC Role / Device Role / Timing Role: Front-end ADC with programmable reference scaling; VREF set to 2.5 V to maximize resolution for low-level signals. Use Value: ±2 LSB integral linearity and 50 µVrms noise ensure <0.1% measurement uncertainty; low input bias supports direct connection to high-Z bridges. |
Use Scenario: Portable handheld meter for field calibration of process instruments powered by two AA alkaline cells. IC Role / Device Role / Timing Role: Core ADC in sleep-wake architecture; wakes on timer interrupt, samples once, shuts down, and reports via Bluetooth LE. Use Value: Shutdown current of 3 µA preserves battery capacity during 99.9% idle time; SOIC-8 footprint fits tight mechanical envelopes. |
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 |
|---|---|---|---|
| ADS1286UA | Same SOIC-8 package and pinout; rated for 0°C to +70°C industrial range | Not suitable for automotive or extended-temperature industrial deployments | Select ADS1286UA only if ambient operating temperature remains within 0–70°C and cost optimization is prioritized |
| ADS1286UC | Same SOIC-8 package; ±1 LSB integral linearity (vs ±2 LSB for ADS1286UB); MSL-3 packaging | Higher precision required for metrology-grade instrumentation; longer floor life before reflow | Choose ADS1286UC when sub-LSB linearity is mandatory and extended moisture sensitivity handling is needed |
Compared with ADS1286UA and ADS1286UC, the ADS1286UB uniquely balances extended temperature operation (–40°C to +85°C), production-ready MSL-2 packaging, and cost-effective ±2 LSB linearity-making it optimal for volume industrial and automotive-adjacent applications where reliability across thermal extremes is non-negotiable.
Availability
ADS1286UB is available at Aetrix Electronics and suitable for remote data acquisition, isolated sensor interfaces, and battery-operated portable instrumentation requiring stable component supply across extended temperature ranges.
Supply support for ADS1286UB 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 rigorous qualification standards for industrial and automotive applications.
The ADS1286UB belongs to TI's legacy high-precision SAR ADC family, designed specifically for low-power, isolated, and remote measurement systems where accuracy, noise immunity, and long-term stability are critical.
FAQ
What is the maximum clock frequency supported by the ADS1286UB?
The ADS1286UB supports a maximum DCLOCK frequency of 200 kHz, corresponding to a minimum clock cycle time of 80 µs. At this rate, the device achieves its full 20 kHz sampling capability. Exceeding 200 kHz violates timing specifications and may cause invalid data or increased conversion errors. The ADS1286UB datasheet specifies tCYC ≥ 80 µs under all operating conditions.
Does the ADS1286UB require an external reference voltage?
Yes, the ADS1286UB requires an external reference voltage applied to the VREF pin. It does not include an internal reference. The device accepts reference voltages from 1.25 V to 5.25 V, and the full-scale input range is determined by VREF. For example, with VREF = 2.5 V, the differential input range is 0 V to 2.5 V. Reference stability directly impacts measurement accuracy.
Can the ADS1286UB operate with a 3.3 V supply?
No, the ADS1286UB is specified only for +VCC = 4.5 V to 5.25 V. Operation at 3.3 V falls outside absolute maximum and recommended operating conditions. Logic thresholds, internal biasing, and reference compliance are all calibrated for 5 V nominal supply. Using 3.3 V risks incomplete conversions, invalid DOUT timing, or permanent damage due to violation of VIH/VIL specifications.
How does the CS/SHDN pin function in shutdown mode?
When CS/SHDN is driven high (to +VCC), the ADS1286UB enters full shutdown mode, drawing only 3 µA quiescent current. In this state, the internal bias circuits, comparator, and reference buffer are disabled, and DOUT goes to high-impedance. Conversion is halted until CS/SHDN is pulled low again. This feature enables precise power gating in energy-constrained systems.
What is the meaning of "no missing codes" for the ADS1286UB?
"No missing codes" means that the ADS1286UB guarantees monotonic transfer function across its entire 12-bit output range (0 to 4095). For every incremental increase in analog input, the digital output either stays the same or increases by exactly one code-never skipping any integer value. This is essential for control loop stability and avoids ambiguous states in feedback systems.
ADS1286UB 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:
- 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:
- -
ADS1286UB FAQ
1.How can I place an order for ADS1286UB through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1286UB 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 ADS1286UB reliable?
The price and inventory of ADS1286UB are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1286UB is usually 5 days.
3.What payment methods are accepted for ADS1286UB?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1286UB transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1286UB?
ADS1286UB orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1286UB 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 ADS1286UB?
For technical support, including ADS1286UB datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1286UB requirements.
6.How does Aetrix verify that ADS1286UB is sourced from the original manufacturer or authorized distributors?
All ADS1286UB 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 ADS1286UB meets industry standards.
7.What is the process for return or replacement of ADS1286UB?
All ADS1286UB units undergo pre-shipment inspection (PSI). If there is an issue with ADS1286UB, 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 ADS1286UB part is unused and in its original packaging.
Return procedure for ADS1286UB:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
ADS1286UB Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
