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Analog Devices Inc./Maxim Integrated MAX1286EKA
- Part No.:
- MAX1286EKA
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- SOT-23-8
- Datasheet:
-
MAX1286EKA.pdf
- Description:
- 12-BIT TRUE-DIFFERENTIAL ADC
- Quantity:
- Payment:
- Shipping:
Inventory:533
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Product details
Overview
MAX1286EKA from Maxim Integrated is a 12-bit, 150ksps successive-approximation ADC in an 8-pin SOT23 package, operating from a single +5V supply. It supports 2-channel single-ended analog inputs (0 to VREF), features AutoShutdown™ (0.2µA), 3.7µs conversion time, and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface-ideal for portable battery-powered data acquisition systems.
For engineers reviewing the MAX1286EKA datasheet, MAX1286EKA pinout, MAX1286EKA application, or MAX1286EKA equivalent, this page delivers verified technical context, real-world use cases, pin-level design meaning, and validated alternative options for low-power, space-constrained embedded sensing designs.
Technical Context
The MAX1286EKA implements a SAR architecture with integrated track-and-hold, enabling precise sampling of two single-ended channels (AIN1/AIN2 vs. GND) using CNVST edge sequencing. Its internal 4MHz oscillator (±10%) eliminates external clock dependency while supporting up to 8MHz SCLK for data readout.
Conversion is initiated by a rising CNVST edge (power-up + track), followed by falling edge (hold + start). The device automatically enters shutdown after conversion completion, achieving 0.2µA quiescent current between conversions-critical for intermittent-sampling applications like portable temperature monitors.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 1 LSB = VREF/4096 quantization step for high-fidelity sensor digitization |
| Sampling Rate | 150ksps - supports real-time capture of signals up to ~100kHz full-linear bandwidth |
| Supply Voltage | +4.75V to +5.25V - compatible with standard 5V logic rails and industrial power domains |
| Power Consumption | 245µA at 150ksps (VDD = +5V) - enables >1-year battery life in 1ksps wake-up cycles |
| INL / DNL | ±1.0 LSB / ±1.0 LSB - ensures monotonicity and <0.025% end-point linearity error |
| Reference Input | VREF = +4.096V typical - matches 12-bit resolution with 1mV LSB scale for precision measurement |
| Interface Compatibility | SPI/QSPI/MICROWIRE - interoperates with common microcontroller peripherals without protocol translation |
Pinout & Package
Package: 8-pin SOT23 (K8F-4), footprint-compatible with industry-standard 8-lead SOT packages; thermal resistance θJA = 103°C/W.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | Must be bypassed with 0.1µF capacitor to GND; powers internal T/H, SAR core, and digital interface |
| AIN1 (Pin 2) | Analog input channel 1 | Single-ended input referenced to GND; selected when CNVST pulse width ≥ tACQ after rising edge |
| AIN2 (Pin 3) | Analog input channel 2 | Single-ended input referenced to GND; selected via dual-edge CNVST sequence (high→low→high) |
| GND (Pin 4) | Analog/digital ground reference | Star-point connection required; separates analog and digital return paths to minimize noise coupling |
| REF (Pin 5) | External reference voltage input | Accepts +1V to VDD+50mV; sets full-scale range; requires 0.1µF local bypass for stability |
| CNVST (Pin 6) | Conversion start control | Rising edge powers up and initiates track mode; falling edge triggers hold and conversion; also selects input channel |
| DOUT (Pin 7) | Serial data output | MSB-first, SCLK-falling-edge aligned; tri-states after 12-bit read; sinks 2mA max at VOL = 0.4V |
| SCLK (Pin 8) | Serial clock input | Accepts 0–8MHz clock; duty cycle 30–70%; controls timing of DOUT bit transitions and data capture |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ between conversions | Reduces average current to 0.2µA during idle periods-enables µA-level system sleep modes |
| True single-supply +5V operation | Eliminates need for negative or split supplies-simplifies power design in portable instrumentation |
| Internal conversion clock | Removes external clock source dependency-reduces BOM count and layout complexity |
| 1.4µs acquisition time (tACQ) | Supports signal sources with RS ≤ 300Ω without performance degradation-minimizes external buffering |
| 3-wire SPI/QSPI/MICROWIRE interface | Direct compatibility with ARM Cortex-M, PIC, and DSP serial peripherals-no glue logic required |
Applications
| Portable Temperature Monitors | Flowmeters |
|---|---|
Use Scenario: Battery-powered handheld thermometers measuring NTC/RTD sensors in field service environments. IC Role / Device Role / Timing Role: Digitizes conditioned analog outputs from precision temperature front-ends at 1–10ksps, synchronizing acquisition to button press or timer interrupt. Use Value: 245µA active current and 0.2µA shutdown enable multi-year coin-cell operation; 12-bit resolution resolves 0.025°C steps with 4.096V reference. | Use Scenario: Ultrasonic or turbine-based flow sensors in smart water/gas meters requiring periodic burst-mode sampling. IC Role / Device Role / Timing Role: Captures differential pressure or rotational pulse signals at sub-100ksps rates, triggered by flow event detection logic. Use Value: Single-ended dual-channel support allows simultaneous monitoring of upstream/downstream sensors; AutoShutdown cuts average power by >99% between readings. |
| Touch Screens | Low-Power Data Acquisition |
Use Scenario: Resistive touch overlay on industrial HMIs where power budget limits continuous scanning. IC Role / Device Role / Timing Role: Reads X/Y electrode voltages sequentially via AIN1/AIN2 selection using CNVST edge control-no external MUX needed. Use Value: 3.7µs conversion time enables <1ms per coordinate pair; 8-pin SOT23 minimizes PCB area in tight bezel designs. | Use Scenario: Remote environmental sensor nodes logging temperature, humidity, and light over LoRaWAN or NB-IoT links. IC Role / Device Role / Timing Role: Provides high-accuracy analog digitization for multi-sensor analog front-ends, synchronized to ultra-low-power MCU wake cycles. Use Value: ±1.0 LSB INL ensures calibrated accuracy across -40°C to +85°C; 0.1µF REF bypass enables stable reference under varying load conditions. |
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 only; no SOT23 option; 125ksps max; requires external reference; no AutoShutdown | Lacks integrated power management-requires external enable control for low-duty-cycle use | Select when board space permits SOIC and external reference is already available |
| AD7476ARTZ-REEL7 | 6-pin SOT23; 1MSPS; +2.35V to +5.25V supply; SPI-only interface; no dual-channel input mux | Single-input architecture-requires external analog switch for multi-channel use | Select when higher speed and smaller footprint are prioritized over channel count and autonomous shutdown |
Compared with ADS7822U and AD7476ARTZ-REEL7, the MAX1286EKA uniquely integrates dual single-ended input selection, AutoShutdown, and SOT23 packaging-reducing component count, PCB area, and average system power in portable sensing nodes.
Availability
MAX1286EKA is available at Aetrix Electronics and suitable for portable temperature monitors, flowmeters, and touch screens requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1286EKA 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 demanding industrial, medical, and portable applications.
The MAX1286–MAX1289 family targets ultra-low-power, space-constrained data acquisition-delivering 12-bit accuracy with micropower consumption and minimal external components.
FAQ
What supply voltage range does the MAX1286EKA support?
The MAX1286EKA operates from +4.75V to +5.25V DC. This 5V nominal range ensures compatibility with standard logic supplies and industrial power rails. Operation outside this range may cause permanent damage, as specified in the Absolute Maximum Ratings. The device draws 245µA at full 150ksps throughput when powered at +5V, making it suitable for regulated 5V battery or wall-adapter systems.
How does the MAX1286EKA select between its two analog input channels?
The MAX1286EKA uses the CNVST pin to select between AIN1 and AIN2. A single rising edge followed by ≥1.4µs high time selects AIN1; a high→low→high pulse sequence (each ≥30ns) selects AIN2. This hardware-based channel selection eliminates the need for external multiplexers or GPIO-controlled switches, simplifying layout and reducing bill-of-materials cost in dual-sensor applications.
Does the MAX1286EKA require an external reference voltage?
Yes, the MAX1286EKA requires an external reference voltage applied to the REF pin. Typical operation uses +4.096V to match its 12-bit resolution (1 LSB = 1mV). The REF input accepts +1V to VDD+50mV and must be bypassed with a 0.1µF capacitor to GND for optimal noise rejection and linearity. No internal reference is provided-this design choice maximizes flexibility and accuracy across varying system reference architectures.
What is the conversion time and acquisition time for the MAX1286EKA?
The MAX1286EKA has a fixed conversion time (tCONV) of 3.7µs and a maximum acquisition time (tACQ) of 1.4µs. tCONV is measured from CNVST falling edge to MSB validity at DOUT; tACQ is the minimum high-time required on CNVST for full signal settling. These values are guaranteed over the full -40°C to +85°C temperature range and enable deterministic timing in interrupt-driven or DMA-based acquisition firmware.
Is the MAX1286EKA pin-compatible with other devices in the MAX1286–MAX1289 family?
Yes, the MAX1286EKA shares identical 8-pin SOT23 pinout and function mapping with MAX1287EKA, MAX1288EKA, and MAX1289EKA. However, supply voltage (3V vs. 5V), input configuration (single-ended vs. true-differential), and unipolar/bipolar mode capability differ across variants. Pin compatibility enables shared PCB footprints but requires firmware and reference voltage adjustments when substituting between families.
MAX1286EKA Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- SOT-23-8
- Packaging:
- Bulk
- Product Status:
- Active
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 150
- Number of Inputs:
- 1
- Input Type:
- Differential, Single Ended
- Data Interface:
- 3-Wire Serial, Microwire, QSPI, 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:
- 4.75V ~ 5.25V
- Voltage - Supply, Digital:
- 4.75V ~ 5.25V
- Features:
- Internal Oscillator
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- SOT-23-8
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1286EKA FAQ
1.How can I place an order for MAX1286EKA through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1286EKA 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 reliable?
The price and inventory of MAX1286EKA are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1286EKA is usually 5 days.
3.What payment methods are accepted for MAX1286EKA?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1286EKA transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1286EKA?
MAX1286EKA orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1286EKA 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?
For technical support, including MAX1286EKA datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1286EKA requirements.
6.How does Aetrix verify that MAX1286EKA is sourced from the original manufacturer or authorized distributors?
All MAX1286EKA 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 meets industry standards.
7.What is the process for return or replacement of MAX1286EKA?
All MAX1286EKA units undergo pre-shipment inspection (PSI). If there is an issue with MAX1286EKA, 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 part is unused and in its original packaging.
Return procedure for MAX1286EKA:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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