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Texas Instruments ADS1286PC
- Part No.:
- ADS1286PC
- Manufacturer:
- Texas Instruments
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-DIP (0.300", 7.62mm)
- Datasheet:
-
ADS1286PC.pdf
- Description:
- IC ADC 12BIT SAR 8DIP
- Quantity:
- Payment:
- Shipping:
Inventory:4,386
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Product details
Overview
ADS1286PC 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, or battery-powered data acquisition systems.
For engineers reviewing the ADS1286PC datasheet, ADS1286PC pinout, ADS1286PC application, or ADS1286PC equivalent, this page delivers verified technical context, exact pin functionality, real-world use cases in transducer interfacing and thermocouple measurement, and two validated alternative options aligned with its micropower, serial-output ADC role.
Technical Context
The ADS1286PC implements a successive approximation register (SAR) architecture with on-chip sample-and-hold, enabling precise DC and low-frequency AC signal digitization up to 20kHz. Its serial interface uses DCLOCK-synchronized falling-edge data output and CS/SHDN-controlled shutdown, supporting LSB-first 12-bit transfers after one null bit.
It features guaranteed no missing codes, ±1 LSB integral linearity (ILIN), and operates with VREF from 1.25V to 5.5V - allowing resolution scaling while maintaining linearity over wide reference voltage ranges. Power consumption drops automatically between conversions, with shutdown current as low as 3µA when CS is high.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit SAR - delivers 4096 discrete output levels with monotonic transfer function and no missing codes. |
| Sampling Rate | 20 kHz maximum - supports real-time monitoring of fast-changing sensor outputs such as strain gauges or pressure transducers. |
| Supply Current | 250 µA typical at 5V - enables multi-year operation from coin-cell batteries in portable instrumentation. |
| Input Type | Differential (±In) - rejects common-mode noise in noisy industrial environments and improves SNR by up to 6 dB vs single-ended. |
| Reference Range | 1.25 V to 5.5 V - permits flexible full-scale adjustment; e.g., 2.5V reference yields 610 µV/LSB for high-precision thermocouple digitization. |
| Interface | SPI/SSI-compatible 3-wire serial - requires only CS/SHDN, DCLOCK, and DOUT lines, minimizing PCB routing and isolation component count. |
| Temperature Range | –40°C to +85°C - qualified for automotive under-hood, industrial control, and outdoor environmental sensing applications. |
Pinout & Package
ADS1286PC is housed in an 8-pin plastic mini-DIP (PDIP) package with 0.3-inch body width and through-hole mounting. Pin spacing is 0.1 inch, compatible with standard prototyping and production PCB layouts.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 | VREF | Reference voltage input - sets full-scale range; high-impedance node during conversion, draws ≤2.5 µA at 200 kHz clock. |
| 2 | +In | Non-inverting analog input - accepts signals up to VCC+0.2V; input leakage <±1 µA ensures minimal offset drift in high-Z sensor interfaces. |
| 3 | –In | Inverting analog input - used for differential measurement or grounded for pseudo-differential mode; matched to +In for CMRR >82 dB. |
| 4 | GND | Analog ground reference - must be star-connected to minimize noise coupling into sensitive analog front-end. |
| 5 | CS/SHDN | Chip select / shutdown control - active-low enables conversion and serial output; pulled high disables bias circuits and reduces supply current to 3 µA. |
| 6 | DOUT | Serial data output - outputs 12-bit straight-binary code LSB-first on falling DCLOCK edge; tri-states when CS is high. |
| 7 | DCLOCK | Data clock input - synchronizes serial transfer and controls conversion speed; minimum pulse width 50 ns, max frequency 200 kHz. |
| 8 | +VCC | Power supply - accepts 4.5 V to 5.25 V; internal regulation ensures stable core operation despite rail ripple up to 20 mV. |
Key Features
| Feature | Design Value |
|---|---|
| No missing codes guarantee | Ensures monotonicity across full 12-bit range - critical for closed-loop control where code skips cause instability. |
| Auto-shutdown between conversions | Reduces average current proportionally to sample rate - e.g., 1.6 kHz sampling draws ~150 µA, extending battery life in intermittent-read systems. |
| Low input leakage (±1 µA) | Preserves accuracy when interfacing high-impedance sources like pH electrodes or piezoresistive sensors without external buffering. |
| CMOS logic compatibility | VIH ≥3 V and VOL ≤0.4 V at 250 µA drive - ensures reliable interfacing with 3.3 V or 5 V microcontrollers without level shifters. |
| Flexible reference support | Operates down to 1.25 V reference - enables low-voltage sensor signal digitization while retaining ±1 LSB linearity performance. |
Applications
| Remote Data Acquisition | Isolated Data Acquisition |
|---|---|
Use Scenario: Wireless sensor nodes deployed in oil-field pipelines monitor temperature and pressure using 4–20 mA loop-powered transmitters. IC Role / Device Role / Timing Role: ADS1286PC digitizes conditioned analog outputs with 12-bit precision and transmits results via low-power RF link. Use Value: 250 µA quiescent current extends node lifetime beyond 5 years on AA batteries; 3-wire interface simplifies opto-isolated UART bridge design. |
Use Scenario: Medical patient monitors acquire ECG signals across reinforced isolation barriers to meet IEC 60601 creepage requirements. IC Role / Device Role / Timing Role: ADS1286PC resides on the patient-side board, converting differential biopotential signals before transmission across digital isolators. Use Value: Differential input rejects 50/60 Hz mains interference; low power minimizes heat generation near skin-contact electrodes. |
| Transducer Interface | Battery-Operated Systems |
Use Scenario: Industrial load cells feed mV-level Wheatstone bridge outputs to a signal conditioning stage before digitization. IC Role / Device Role / Timing Role: ADS1286PC serves as the final-stage ADC, accepting amplified and filtered bridge voltage with precise gain matching. Use Value: ±1 LSB integral linearity ensures <0.025% FS error across full scale; 20 kHz sampling captures transient mechanical events like impact shocks. |
Use Scenario: Handheld gas detectors use electrochemical sensors whose output currents are converted to voltage and digitized. IC Role / Device Role / Timing Role: ADS1286PC performs periodic 12-bit conversions triggered by MCU sleep-wake cycles to conserve energy. Use Value: Shutdown mode draws only 3 µA - reducing standby power to negligible levels; SOIC and PDIP variants allow both compact and serviceable designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, micropower, serial-output ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1286UC | Same 8-pin SOIC package, identical –40°C to +85°C rating, but ±1 LSB linearity specified for SOIC variant (not PDIP). | Preferred for space-constrained PCBs requiring surface-mount assembly; same pinout and timing as ADS1286PC. | Select ADS1286UC when automated SMT placement is required and thermal/mechanical stress favors SOIC over through-hole PDIP. |
| ADS1287PC | Pin-compatible upgrade offering 16-bit resolution, 4.8 kHz max sampling, and 350 µA supply current - retains same PDIP-8 footprint and serial interface. | Used where higher resolution justifies lower throughput, e.g., precision weigh scales or calibration equipment. | Choose ADS1287PC when system accuracy demands >12-bit ENOB and sampling rate ≤4.8 kHz is acceptable. |
Compared with ADS1286UC, ADS1286PC offers identical electrical specs in a through-hole package ideal for prototyping and high-reliability vibration-prone installations; versus ADS1287PC, it trades resolution for 4× faster sampling and 30% lower power - favoring dynamic sensor monitoring over static precision measurement.
Availability
ADS1286PC is available at Aetrix Electronics and suitable for remote data acquisition, isolated medical instrumentation, and battery-operated environmental sensors requiring stable component supply across extended product lifecycles.
Supply support for ADS1286PC 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 including the ADS12xx series. TI is a global leader in analog IC design, manufacturing, and long-term product support.
The ADS1286PC belongs to TI's legacy micropower SAR ADC family, engineered specifically for low-power, isolated, and remote sensing applications where serial interface simplicity and guaranteed monotonicity are essential.
FAQ
What is the operating temperature range of the ADS1286PC?
The ADS1286PC is rated for continuous operation from –40°C to +85°C. This industrial-grade temperature range is confirmed in the official TI datasheet Package/Ordering Information table, where ADS1286PC is explicitly listed under the "–40°C to +85°C" column for the Plastic DIP package. It meets specifications across this full range without derating.
Does the ADS1286PC support true differential input operation?
Yes, the ADS1286PC supports true differential input operation between pins 2 (+In) and 3 (–In). The datasheet specifies "Full-Scale Input Range: +In – (–In)" and confirms differential linearity of ±0.5 LSB typical. This allows rejection of common-mode noise and direct connection to bridge-based transducers without external instrumentation amplifiers.
What is the minimum reference voltage supported by the ADS1286PC?
The ADS1286PC supports a minimum reference voltage of 1.25 V, as stated in the REFERENCE INPUT section of the datasheet. Operation below this voltage is not guaranteed - the device may exhibit degraded linearity or increased offset error. At 1.25 V reference, LSB size is 305 µV, demanding careful attention to noise and offset calibration.
Can the ADS1286PC be used with a 3.3 V microcontroller?
Yes, the ADS1286PC can interface directly with 3.3 V microcontrollers. Its digital inputs accept VIH ≥3 V and VIL ≤0.8 V, fully compatible with 3.3 V CMOS logic. DOUT output VOH ≥3 V and VOL ≤0.4 V at 250 µA load ensure robust signal integrity without level-shifting circuitry.
How does the CS/SHDN pin affect power consumption in the ADS1286PC?
When CS/SHDN is held high (≥VCC), the ADS1286PC enters full shutdown mode, drawing only 3 µA supply current. When pulled low, it powers up bias circuits and enables conversion and serial output. The auto-shutdown feature further reduces average current between conversions - e.g., at 1.6 kHz sampling, typical current drops to ~150 µA.
ADS1286PC 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:
- -
ADS1286PC FAQ
1.How can I place an order for ADS1286PC through Aetrix?
Please submit a Request for Quotation (RFQ) for ADS1286PC 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 ADS1286PC reliable?
The price and inventory of ADS1286PC are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for ADS1286PC is usually 5 days.
3.What payment methods are accepted for ADS1286PC?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for ADS1286PC transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for ADS1286PC?
ADS1286PC orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your ADS1286PC 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 ADS1286PC?
For technical support, including ADS1286PC datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your ADS1286PC requirements.
6.How does Aetrix verify that ADS1286PC is sourced from the original manufacturer or authorized distributors?
All ADS1286PC 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 ADS1286PC meets industry standards.
7.What is the process for return or replacement of ADS1286PC?
All ADS1286PC units undergo pre-shipment inspection (PSI). If there is an issue with ADS1286PC, 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 ADS1286PC part is unused and in its original packaging.
Return procedure for ADS1286PC:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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