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Analog Devices Inc./Maxim Integrated MAX1286EKA+T
- Part No.:
- MAX1286EKA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
MAX1286EKA+T.pdf
- Description:
- IC ADC 12BIT SAR SOT23-8
- Quantity:
- Payment:
- Shipping:
Inventory:1,974
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Product details
Overview
MAX1286EKA+T from Maxim Integrated is a 12-bit, 2-channel single-ended successive-approximation analog-to-digital converter (SAR ADC) in an 8-pin SOT23 package, operating from a +5V supply. It delivers 150ksps sampling rate, ±1.0 LSB INL, and 70dB SINAD at 10kHz input, with AutoShutdown current of 0.2µA between conversions-ideal for portable battery-powered data acquisition systems requiring precision and ultra-low power.
For engineers reviewing the MAX1286EKA+T datasheet, MAX1286EKA+T pinout, MAX1286EKA+T application, or MAX1286EKA+T equivalent, key selection considerations include its 2-channel single-ended topology, 5V-only operation (not 3V-compatible), SPI/QSPI/MICROWIRE interface timing, and true differential capability being exclusive to MAX1288/MAX1289 variants-not applicable to this part.
Technical Context
The MAX1286EKA+T implements a SAR architecture with integrated track-and-hold, using an internal 4MHz oscillator (±10%) to achieve fixed 3.7µs conversion time. Its analog front-end accepts two single-ended inputs (AIN1, AIN2) referenced to GND, with input range 0 to VREF (up to +4.096V), and features channel selection via CNVST pulse sequencing.
Digital interface compliance includes SPI Mode 0 (CPOL=0, CPHA=0), QSPI, and MICROWIRE protocols, supporting up to 8MHz SCLK with MSB-first output on DOUT. Power management relies entirely on CNVST-triggered AutoShutdown, eliminating external control logic for low-duty-cycle operation.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes over full-scale range |
| Sampling Rate | 150ksps - supports real-time monitoring of signals up to ~75kHz Nyquist bandwidth |
| INL | ±1.0 LSB - ensures monotonicity and <0.025% full-scale linearity error after calibration |
| Supply Voltage | +4.75V to +5.25V - requires stable 5V rail; not compatible with 3V systems |
| Power Consumption | 245µA at 150ksps - enables >4-year battery life in 1ksps wake-up sensor nodes |
| SINAD | 70dB at 10kHz - supports accurate digitization of audio-band and industrial sensor signals |
| Aperture Jitter | <50ps - minimizes sampling uncertainty for high-frequency signal fidelity |
Pinout & Package
Package: 8-pin SOT23 (3.0mm × 1.6mm × 1.1mm), RoHS-compliant, exposed pad optional (not electrically connected by default).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (VDD) | Positive supply input | Must be bypassed with 0.1µF capacitor to GND; powers internal reference, T/H, and SAR core |
| 2 (AIN1) | Analog input channel 1 | Single-ended input referenced to GND; selected when CNVST pulse is high-only |
| 3 (AIN2) | Analog input channel 2 | Single-ended input referenced to GND; selected by CNVST low-high sequence |
| 4 (GND) | Analog/digital ground | Common return for VDD, REF, and all analog/digital signals; star-point grounding required |
| 5 (REF) | External reference voltage | Accepts 1.0V to VDD+50mV; sets full-scale range (e.g., 4.096V → 1mV/LSB) |
| 6 (CNVST) | Conversion start/control | Rising edge initiates track mode; falling edge triggers hold & conversion; also selects channel |
| 7 (DOUT) | Serial data output | 3-state output; presents 12-bit MSB-first data after 3.7µs; high-impedance post-read |
| 8 (SCLK) | Serial clock input | Accepts 0–8MHz clock; data valid on falling edge; controls read timing for µP synchronization |
Key Features
| Feature | Design Value |
|---|---|
| Single-supply +5V operation | Eliminates need for dual-rail supplies or level shifters in 5V microcontroller systems |
| AutoShutdown between conversions | Reduces average current to 0.2µA during idle, enabling energy harvesting compatibility |
| True 2-channel single-ended topology | Allows independent sampling of two sensors without external multiplexer or reconfiguration delay |
| SPI/QSPI/MICROWIRE compatibility | Direct interface to common MCU peripherals without protocol translation or glue logic |
| Internal conversion clock | Relieves host processor from generating precise SAR timing; simplifies firmware design |
Applications
| Portable Temperature Monitors | Flowmeters |
|---|---|
Use Scenario: Battery-powered handheld thermometers measuring thermistor or RTD outputs in field service tools. IC Role / Device Role / Timing Role: Single-ended ADC digitizing two temperature channels (ambient + probe) with 12-bit resolution and sub-0.1°C accuracy. Use Value: 245µA active current and 0.2µA shutdown enable multi-year operation on coin-cell batteries. | Use Scenario: Ultrasonic or turbine-based flow sensors in smart water/gas meters requiring dual analog inputs. IC Role / Device Role / Timing Role: Simultaneous sampling of flow transducer voltage and temperature compensation signal. Use Value: Channel-selectable CNVST control allows synchronized dual acquisition without added timing complexity. |
| Touch Screens | Low-Power Data Acquisition |
Use Scenario: Resistive touch panel controllers in medical handhelds where EMI immunity and low standby power are critical. IC Role / Device Role / Timing Role: Digitizing X/Y electrode voltages in rapid succession using AIN1/AIN2 switching via CNVST. Use Value: 1.4µs acquisition time supports >100Hz touch update rates while maintaining 12-bit linearity. | Use Scenario: Wireless sensor nodes collecting vibration, pressure, or humidity data at 1–10ksps duty cycles. IC Role / Device Role / Timing Role: Core ADC in ultra-low-power data logger with automatic sleep/wake triggered by external event. Use Value: AutoShutdown eliminates software-controlled power gating, reducing firmware overhead and leakage risk. |
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 |
|---|---|---|---|
| ADS7822U | 8-pin SOIC; 12-bit, 200ksps; requires external reference; no AutoShutdown | Higher speed but higher quiescent current (1.2mA); needs external power control logic | Select when throughput >150ksps is mandatory and board space allows SOIC |
| MAX11131AUT+T | 8-pin SOT23; 12-bit, 500ksps; +2.7V to +3.6V only; built-in reference | 3V-only supply; incompatible with 5V systems; integrates 2.048V reference | Select for 3V battery designs needing higher speed and reference integration |
Compared with ADS7822U and MAX11131AUT+T, the MAX1286EKA+T uniquely balances 5V compatibility, ultra-low shutdown current (0.2µA), and compact SOT23 footprint-making it optimal for legacy 5V sensor interfaces where power budget and PCB area are constrained.
Availability
MAX1286EKA+T is available at Aetrix Electronics and suitable for portable temperature monitors, flowmeters, touch screens, and low-power data-acquisition systems requiring stable component supply across extended production lifecycles.
Supply support for MAX1286EKA+T 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
Maxim Integrated (now part of Analog Devices) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX1286–MAX1289 family targets portable, battery-constrained systems demanding high-resolution ADC performance with micropower operation and minimal board area-specifically optimized for sensor interfacing in handheld and remote instrumentation.
FAQ
What is the maximum sampling rate of the MAX1286EKA+T?
The MAX1286EKA+T achieves a maximum sampling rate of 150ksps, corresponding to a fixed 3.7µs conversion time driven by its internal 4MHz oscillator. This rate is sustained under full-load conditions (VDD = +5V, fSCLK = 8MHz) and supports anti-aliasing filter design for signals up to 75kHz. The device maintains specified INL and SINAD performance at this rate.
Does the MAX1286EKA+T support true-differential input operation?
No, the MAX1286EKA+T does not support true-differential input. It is a 2-channel single-ended ADC-AIN1 and AIN2 are both referenced to GND. True-differential operation (AIN+ vs. AIN−) is exclusive to the MAX1288EKA+T and MAX1289EKA+T variants within the same family.
Can the MAX1286EKA+T operate from a 3V supply?
No, the MAX1286EKA+T is rated only for +4.75V to +5.25V operation. For 3V-compatible operation, engineers must select the MAX1287EKA+T or MAX1289EKA+T-these are functionally identical but specified for +2.7V to +3.6V supply rails.
How is channel selection implemented on the MAX1286EKA+T?
Channel selection on the MAX1286EKA+T is controlled solely by the CNVST pin timing: a single high pulse selects AIN1; a low-high-low-high sequence selects AIN2. No register writes or external logic is needed-this hardware-based method ensures deterministic, low-latency switching between inputs.
What reference voltage should be used with the MAX1286EKA+T?
The MAX1286EKA+T requires an external reference voltage applied to the REF pin, typically +4.096V for optimal 1mV/LSB scaling. The device accepts 1.0V to VDD+50mV; a 0.1µF ceramic capacitor must be placed directly at the REF pin to GND to ensure stable conversion accuracy and low noise.
MAX1286EKA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 150k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- 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:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1286EKA+T FAQ
1.How can I place an order for MAX1286EKA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1286EKA+T 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 MAX1286EKA+T reliable?
The price and inventory of MAX1286EKA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1286EKA+T is usually 5 days.
3.What payment methods are accepted for MAX1286EKA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1286EKA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1286EKA+T?
MAX1286EKA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1286EKA+T 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 MAX1286EKA+T?
For technical support, including MAX1286EKA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1286EKA+T requirements.
6.How does Aetrix verify that MAX1286EKA+T is sourced from the original manufacturer or authorized distributors?
All MAX1286EKA+T 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 MAX1286EKA+T meets industry standards.
7.What is the process for return or replacement of MAX1286EKA+T?
All MAX1286EKA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1286EKA+T, 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 MAX1286EKA+T part is unused and in its original packaging.
Return procedure for MAX1286EKA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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