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Texas Instruments ADS1286UCG4
- Part No.:
- ADS1286UCG4
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-SOIC (0.154", 3.90mm Width)
- Datasheet:
-
ADS1286UCG4.pdf
- Description:
- IC ADC 12BIT SAR 8SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:4,416
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Product details
Overview
ADS1286UCG4 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, SPI/SSI-compatible 3-wire serial interface, and micropower operation at 250µA typical supply current. It operates from a single +5V supply, supports external reference voltages from 1.25V to 5.25V, and targets precision remote sensing in battery-powered or isolated systems.
For engineers reviewing the ADS1286UCG4 datasheet, ADS1286UCG4 pinout, ADS1286UCG4 application, or ADS1286UCG4 equivalent, key selection criteria include guaranteed no-missing-codes performance, low-noise 500kHz small-signal bandwidth, ±1 LSB integral linearity (at UC grade), −85dB THD at 1kHz, and SOIC-8 packaging compatible with industrial temperature range (−40°C to +85°C).
Technical Context
The ADS1286UCG4 implements a successive approximation register (SAR) architecture with internal sample-and-hold, enabling precise DC and low-frequency AC signal digitization. Its serial interface uses falling-edge–triggered data clock (DCLOCK) and chip-select–controlled output enable (CS/SHDN), supporting LSB-first 12-bit data transmission after one null bit.
It features automatic power-down between conversions, reducing quiescent current to 3µA in shutdown mode, and exhibits stable reference input impedance (>5MΩ) across operating conditions. The device maintains ±0.5 LSB differential linearity and 72dB SINAD at 1kHz with full-scale 5Vp-p input, confirming suitability for high-fidelity transducer interfacing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-precision measurement of slow-varying analog signals. |
| Sampling Rate | 20 kHz maximum - supports real-time acquisition of audio-band and sensor signals without aliasing up to 10 kHz. |
| Supply Current | 250 µA typical at 200 kHz clock - enables multi-year battery life in portable instrumentation and remote nodes. |
| Integral Linearity | ±1 LSB (UC grade) - ensures monotonic transfer function and accurate end-point calibration in closed-loop control. |
| THD @ 1 kHz | −85 dB - preserves signal fidelity for thermocouple, RTD, and strain gauge measurements with minimal harmonic distortion. |
| Reference Range | 1.25 V to 5.25 V - allows flexible scaling of input span while maintaining 12-bit resolution and <0.15 LSB noise floor at 5 V. |
| Power-Down Current | 3 µA - reduces system standby power when idle, critical for duty-cycled wireless sensor nodes. |
Pinout & Package
ADS1286UCG4 is housed in an 8-pin SOIC (D) package with standard 1.27 mm pitch, RoHS-compliant NiPdAu lead finish, and MSL Level-2 moisture sensitivity rating. Pin 1 orientation follows Q1 quadrant assignment per tape-and-reel specification.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VREF) | Reference Input | Accepts external voltage (1.25–5.25 V) defining full-scale ADC range; high-impedance node during auto-shutdown. |
| 2 (+In) | Non-Inverting Analog Input | Differential input terminal; supports rail-to-rail common-mode range from −0.2 V to VCC+0.2 V. |
| 3 (−In) | Inverting Analog Input | Differential input terminal; connects to remote ground or sensor return to reject common-mode noise. |
| 4 (GND) | Analog Ground | Primary reference for analog circuitry; must be separated from digital ground in mixed-signal PCB layouts. |
| 5 (CS/SHDN) | Chip Select / Shutdown Control | Active-low enables serial communication; driven high to enter 3 µA shutdown state with reference input high-Z. |
| 6 (DOUT) | Serial Data Output | LSB-first 12-bit output valid on falling edge of DCLOCK; tri-states when CS is high or during conversion setup. |
| 7 (DCLOCK) | Data Clock Input | Synchronizes serial data transfer; clock frequency determines conversion speed (fCLK = 16 × fSAMPLE). |
| 8 (+VCC) | Positive Supply | +4.5 V to +5.25 V supply; powers analog core, reference buffer, and digital interface with 250 µA typical draw. |
Key Features
| Feature | Design Value |
|---|---|
| No Missing Codes Guaranteed | Ensures monotonicity across full 12-bit range-critical for position feedback and safety-critical control loops. |
| Micropower Serial Interface | Enables galvanic isolation via optocouplers or digital isolators without compromising data rate or accuracy. |
| Differential Input Architecture | Rejects common-mode noise up to 82 dB PSRR-ideal for noisy industrial environments with long sensor leads. |
| Auto-Power-Down Between Conversions | Reduces average current proportionally to sample rate, extending battery life in intermittent-monitoring applications. |
| Flexible Reference Voltage Support | Allows trade-off between resolution and noise floor: e.g., 2.5 V reference yields 0.3 LSB peak-to-peak noise vs. 5 V's 0.15 LSB. |
Applications
| Remote Data Acquisition | Isolated Data Acquisition |
|---|---|
Use Scenario: Wireless environmental sensor node measuring temperature and humidity over months on coin-cell battery. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned analog outputs from analog front-end op-amps before SPI transmission to microcontroller. Use Value: 250 µA operating current and 3 µA shutdown enable >5-year battery life; differential inputs suppress EMI from RF modules and switching regulators. |
Use Scenario: High-voltage motor drive monitoring phase currents using isolated shunt amplifiers. IC Role / Device Role / Timing Role: Isolated-side ADC converting amplified shunt voltage into digital stream sent across capacitive isolator to controller side. Use Value: SPI-compatible 3-wire interface minimizes isolator channel count; guaranteed no-missing-codes prevents torque ripple from quantization nonlinearity. |
| Transducer Interface | Battery-Operated Systems |
Use Scenario: Portable handheld multimeter acquiring thermocouple or RTD signals with autoranging. IC Role / Device Role / Timing Role: Precision ADC capturing low-level mV outputs from cold-junction-compensated thermocouples or 4-wire RTDs. Use Value: ±1 LSB integral linearity and −85 dB THD ensure traceable calibration; 500 kHz small-signal bandwidth supports fast step-response verification. |
Use Scenario: Wearable health monitor logging ECG or bioimpedance with ultra-low standby power. IC Role / Device Role / Timing Role: Low-power ADC activated only during scheduled measurement bursts, then entering deep shutdown. Use Value: Auto-shutdown cuts current between samples; SOIC-8 footprint allows compact layout with minimal decoupling capacitance (0.1 µF + 10 µF). |
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 −40°C to +85°C rating, but ±2 LSB integral linearity (vs. ±1 LSB for UC grade). | Acceptable where cost-sensitive designs tolerate slightly reduced DC accuracy, e.g., non-critical industrial monitoring. | Select ADS1286UA only if ±2 LSB INL meets system error budget; ADS1286UCG4 provides tighter linearity without layout or firmware changes. |
| ADS1115IRUGR | I²C interface, 16-bit resolution, 860SPS max, internal PGA, but higher 150 µA active current and no differential sampling hold. | Better for low-speed, high-resolution, multi-channel systems with I²C infrastructure; unsuitable for 20 kHz sampling or isolated SPI links. | Choose ADS1115IRUGR only when resolution >12 bits and I²C compatibility outweigh need for 20 kHz sampling and true differential S/H performance. |
Compared with ADS1286UA, ADS1286UCG4 delivers superior DC accuracy (±1 vs. ±2 LSB INL) at identical package and temperature grade; versus ADS1115IRUGR, it offers 16× higher throughput and dedicated differential S/H-but requires SPI support and lacks programmable gain.
Availability
ADS1286UCG4 is available at Aetrix Electronics and suitable for remote data acquisition, isolated sensor interfaces, and battery-operated instrumentation requiring stable component supply across extended product lifecycles.
Supply support for ADS1286UCG4 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 portfolio, emphasizing high-accuracy data converters, op-amps, and interface ICs for industrial, medical, and test equipment.
The ADS1286UCG4 belongs to TI's legacy high-performance SAR ADC family designed specifically for low-power, isolated, and remote measurement systems where DC accuracy, noise immunity, and minimal supply current are critical.
FAQ
What is the operating temperature range of the ADS1286UCG4?
The ADS1286UCG4 is rated for industrial operation from −40°C to +85°C. This temperature range is confirmed in the Package Option Addendum and applies to all SOIC-packaged UC-grade variants including ADS1286UCG4. Performance specifications-including ±1 LSB integral linearity, 250 µA supply current, and −85 dB THD-are guaranteed across this full range.
Does the ADS1286UCG4 support SPI mode 0 or mode 3?
The ADS1286UCG4 uses a falling-edge–triggered serial interface where data is sampled on the rising edge of DCLOCK and output on the falling edge. This corresponds to SPI Mode 1 (CPOL = 0, CPHA = 1), not Mode 0 or Mode 3. The timing diagram in the datasheet confirms DOUT validity aligned to DCLOCK↓, with setup time referenced to DCLOCK↑.
Can the ADS1286UCG4 operate with a 3.3V supply?
No-the ADS1286UCG4 requires a +4.5 V to +5.25 V supply (VCC). Its absolute maximum rating is +6 V, and logic thresholds (VIH ≥ 3 V, VIL ≤ 0.8 V) assume a 5 V rail. Operating below 4.5 V violates the specified power supply voltage range and may cause conversion errors, increased noise, or failure to meet timing parameters such as tCONV = 12 clock cycles.
How does the CS/SHDN pin function during data readout?
For data readout, CS/SHDN must be held LOW throughout the entire serial transfer. After CS falls, the second DCLOCK pulse enables DOUT, followed by one null bit and then 12 bits of LSB-first data. If CS is brought HIGH mid-transfer, DOUT goes Hi-Z and the conversion sequence resets-requiring a new CS assertion to restart.
What is the significance of the 'G4' suffix in ADS1286UCG4?
The 'G4' suffix denotes tape-and-reel packaging per TI's standard ordering nomenclature: ADS1286UCG4 is supplied in 2500-unit large tape-and-reel format (SOIC-8, 12.4 mm reel width), RoHS-compliant, with MSL Level-2-260°C-1 year rating. It is functionally and electrically identical to ADS1286UC and ADS1286UAG4 variants.
ADS1286UCG4 Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Texas Instruments
- Series:
- -
- Package/Case:
- 8-SOIC (0.154", 3.90mm Width)
- Packaging:
- Tube
- 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:
- -
ADS1286UCG4 FAQ
1.How can I place an order for ADS1286UCG4 through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1286UCG4 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 ADS1286UCG4 reliable?
The price and inventory of ADS1286UCG4 are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1286UCG4 is usually 5 days.
3.What payment methods are accepted for ADS1286UCG4?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1286UCG4 transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1286UCG4?
ADS1286UCG4 orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1286UCG4 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 ADS1286UCG4?
For technical support, including ADS1286UCG4 datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1286UCG4 requirements.
6.How does Aetrix verify that ADS1286UCG4 is sourced from the original manufacturer or authorized distributors?
All ADS1286UCG4 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 ADS1286UCG4 meets industry standards.
7.What is the process for return or replacement of ADS1286UCG4?
All ADS1286UCG4 units undergo pre-shipment inspection (PSI). If there is an issue with ADS1286UCG4, 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 ADS1286UCG4 part is unused and in its original packaging.
Return procedure for ADS1286UCG4:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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