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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:
- ADC, SUCCESSIVE APPROXIMATION, 1
- Quantity:
- Payment:
- Shipping:
Inventory:24,099
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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 single +5V supply. It delivers 150ksps sampling rate, ±1.0 LSB INL, and 70dB SINAD at 10kHz input, with AutoShutdown current of 0.2µA - optimized for portable battery-powered data acquisition where space and power are critical.
For engineers reviewing the MAX1286EKA-T datasheet, MAX1286EKA-T pinout, MAX1286EKA-T application, or MAX1286EKA-T equivalent, this page provides verified electrical parameters, confirmed SOT23 pin mapping, real-world use cases in low-power sensing, and two validated alternative parts with documented functional and interface differences.
Technical Context
The MAX1286EKA-T implements a SAR architecture with on-chip track-and-hold, internal conversion clock (±10% accuracy), and SPI/QSPI/MICROWIRE-compatible 3-wire serial interface. Its CNVST-controlled channel selection enables AIN1/AIN2 switching via pulse-width sequencing, while DOUT outputs MSB-first 12-bit straight-binary data synchronized to SCLK's falling edge.
It features true single-ended analog inputs (0 to VREF), 1.4µs acquisition time, 3.7µs conversion time, and operates across –40°C to +85°C. Reference voltage is externally supplied (4.096V typical), requiring 0.1µF bypassing at REF and VDD pins for specified DC and dynamic performance.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization in sensor interfaces. |
| Sampling Rate | 150ksps - supports real-time capture of fast transients up to ~75kHz Nyquist bandwidth. |
| INL / DNL | ±1.0 LSB / ±1.0 LSB - ensures monotonicity and end-point linearity suitable for precision measurement without calibration. |
| Supply Current | 245µA at 150ksps, 0.2µA in AutoShutdown - enables multi-year battery life in intermittent-sampling applications. |
| SINAD | 70dB at 10kHz - provides >11.6 effective bits for clean signal reconstruction in noise-sensitive environments. |
| Interface | SPI/QSPI/MICROWIRE-compatible 3-wire serial - interoperates with common microcontrollers without level-shifting or protocol translation. |
| Input Range | 0V to VREF (unipolar, single-ended) - simplifies front-end design with rail-to-rail compatible external references. |
Pinout & Package
MAX1286EKA-T is housed in an 8-pin SOT23 package (JEDEC MO-178AA), with exposed pad not connected or grounded per design. Pin functions are electrically validated and match Maxim's official pinout diagram for MAX1286 variants.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| VDD (Pin 1) | Positive supply input | +4.75V to +5.25V operation; requires local 0.1µF ceramic bypass to GND for stable reference and comparator performance. |
| AIN1 (Pin 2) | Analog input channel 1 | Single-ended input referenced to GND; selected when CNVST pulse sequence configures first channel. |
| AIN2 (Pin 3) | Analog input channel 2 | Second single-ended input; selected via dual-edge CNVST timing; shares same VREF and gain path as AIN1. |
| GND (Pin 4) | Analog/digital ground reference | Common return for VDD, REF, and analog inputs; must be star-connected to minimize noise coupling. |
| REF (Pin 5) | External reference voltage input | Accepts 1.0V to VDD+50mV; sets full-scale range (e.g., 4.096V → 1 LSB = 1mV); bypassed with 0.1µF capacitor. |
| CNVST (Pin 6) | Conversion start and mode control | Rising edge powers up device and initiates track mode; falling edge triggers hold and conversion; pulse width selects AIN1 vs. AIN2. |
| DOUT (Pin 7) | Serial data output | 3-state output presenting 12-bit MSB-first straight-binary data; transitions on SCLK falling edge; high-impedance after full read. |
| SCLK (Pin 8) | Serial clock input | Accepts up to 8MHz clock (30–70% duty cycle); controls data timing; no internal clock generation required for interface. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown between conversions | Reduces quiescent current to 0.2µA, enabling µA-level average power in duty-cycled systems. |
| Internal conversion clock | Eliminates need for external timing source; allows host processor to initiate conversion and read back data at its own pace. |
| True single-ended 2-channel input | Supports independent sampling of two sensors (e.g., temperature + pressure) without multiplexer or reconfiguration overhead. |
| Low acquisition time | 1.4µs tACQ enables accurate sampling of signals with source impedances ≤300Ω, reducing external buffering requirements. |
| SOT23 footprint compatibility | 8-pin SOT23 (2.9mm × 1.6mm) allows drop-in replacement in space-constrained PCB layouts designed for similar ADCs. |
Applications
| Portable Temperature Monitors | Flowmeters |
|---|---|
Use Scenario: Battery-operated handheld thermometers measuring thermistor or RTD outputs in field service tools. IC Role / Device Role / Timing Role: Digitizes analog temperature signals at 1–10ksps with <1µA average current during sleep cycles. Use Value: Enables >5-year battery life using CR2032 while maintaining ±0.1°C measurement resolution via 12-bit linearity. | Use Scenario: Ultrasonic or turbine-based flow sensors in smart water/gas meters requiring periodic analog sampling. IC Role / Device Role / Timing Role: Converts differential pressure or pulse-count analog equivalents into digital values synchronized to metering intervals. Use Value: Delivers stable 70dB SNR at 10kHz input, ensuring accurate volumetric calculation under variable pipeline noise conditions. |
| Touch Screens | Low-Power Data Acquisition |
Use Scenario: Resistive touch overlay controllers in industrial HMIs where ESD robustness and low standby power are mandatory. IC Role / Device Role / Timing Role: Reads X/Y electrode voltages sequentially via AIN1/AIN2 switching, triggered by pen-down interrupt. Use Value: Achieves sub-2µs channel switching latency and <0.2µA shutdown current, minimizing system wake-up delay and background drain. | Use Scenario: Wireless sensor nodes collecting vibration, humidity, or ambient light data at 1–100Hz for predictive maintenance. IC Role / Device Role / Timing Role: Front-end ADC interfacing with ultra-low-power MCU; samples only on scheduled wake-up events. Use Value: Reduces total node power budget by 40% versus comparable 10-bit ADCs due to 0.2µA AutoShutdown and 245µA active current at 150ksps. |
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 (1.2mA active) | Higher speed but higher power; lacks integrated shutdown; needs external ref buffer for precision | Select for cost-sensitive industrial designs where board area is less constrained than power budget. |
| MAX1110EKA-T | Same SOT23-8 package; 10-bit, 125ksps; 1.8–5.25V supply; 1.5µA shutdown; no true differential option | Lower resolution and speed; wider supply range; simpler interface; lower cost | Choose when 10-bit resolution suffices and extended voltage tolerance (1.8V) is required for mixed-supply systems. |
Compared with ADS7822U and MAX1110EKA-T, MAX1286EKA-T uniquely balances 12-bit precision, 150ksps throughput, 0.2µA shutdown, and SOT23 size - making it optimal for space- and energy-constrained portable instrumentation where missing codes or drift cannot be tolerated.
Availability
MAX1286EKA-T 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-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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX1286–MAX1289 family was designed for ultra-low-power, space-constrained data-acquisition systems - delivering 12-bit accuracy with micropower consumption and minimal PCB footprint.
FAQ
What supply voltage range does the MAX1286EKA-T support?
The MAX1286EKA-T operates from a single +4.75V to +5.25V supply. It is not rated for 3V operation - that applies only to the MAX1287/MAX1289 variants. Using voltages outside this range may cause permanent damage or violate Absolute Maximum Ratings, including VDD-to-GND stress limits of –0.3V to +6V. Always bypass VDD with a 0.1µF capacitor placed near the MAX1286EKA-T pin.
Does the MAX1286EKA-T support true-differential input mode?
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. Attempting differential connections on MAX1286EKA-T will result in incorrect conversion results or saturation.
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 high–low–high pulse sequence (≥30ns each) selects AIN2. The device does not use register writes or SPI commands for channel switching - it relies entirely on edge-triggered CNVST state transitions, as defined in the MAX1286–MAX1289 functional description.
What is the maximum allowed SCLK frequency for the MAX1286EKA-T?
The MAX1286EKA-T supports a maximum serial clock frequency of 8MHz, with a required duty cycle between 30% and 70%. This allows full 12-bit readout in ≤1.5µs. Exceeding 8MHz violates timing specifications and risks data corruption on DOUT, especially under temperature extremes or varying load capacitance.
Can the MAX1286EKA-T operate without an external reference voltage?
No, the MAX1286EKA-T requires an external reference voltage applied to the REF pin. It has no internal reference. The reference must be stable, low-noise, and within 1.0V to VDD+50mV (i.e., 1.0V to 5.3V for +5V operation). A 0.1µF ceramic capacitor must be placed directly at the REF pin to ensure specified INL, DNL, and dynamic performance.
MAX1286EKA-T 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):
- 150k
- Number of Inputs:
- 2
- Input Type:
- Single Ended
- Data Interface:
- SPI
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- -
- 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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