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Analog Devices Inc./Maxim Integrated MAX1236KEUA+
- Part No.:
- MAX1236KEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1236KEUA+.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,111
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Product details
Overview
The MAX1236KEUA+ from Maxim Integrated is a low-power, 12-bit, 4-channel analog-to-digital converter with integrated track/hold, 4.096V internal reference, I²C-compatible 2-wire serial interface, and operation from 4.5V to 5.5V supply. It delivers 94.4ksps throughput, ±1 LSB INL, and consumes only 670µA at max rate-enabling precision sensing in space-constrained, battery-sensitive industrial monitoring systems.
For engineers reviewing the MAX1236KEUA+ datasheet, MAX1236KEUA+ pinout, MAX1236KEUA+ application, or MAX1236KEUA+ equivalent, this page provides verified technical context, real-world design meaning for key specs, validated pin functions, confirmed alternative options, and supply-chain support details specific to the 8-pin µMAX package variant.
Technical Context
The MAX1236KEUA+ employs successive-approximation architecture with fully differential track/hold circuitry, supporting software-configurable unipolar single-ended (4 channels) or fully differential (2 channels) input modes. Its internal 4.096V reference sets full-scale range, while external reference support (1V to VDD) enables system-level voltage scaling.
It operates exclusively in I²C Fast Mode (400kHz) or High-Speed Mode (1.7MHz), with slave address 0110100 (7-bit). AutoShutdown™ reduces current to <1µA between conversions, and internal clocking eliminates need for external timing components-critical for compact, low-noise embedded data acquisition.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization in sensor and control loops. |
| INL / DNL | ±1 LSB / ±1 LSB - ensures monotonicity and ≤0.024% full-scale linearity error across temperature (−40°C to +85°C). |
| Throughput Rate | 94.4 ksps - supports real-time sampling of dynamic signals up to ~3 MHz bandwidth (full-linear BW = 5 MHz). |
| Supply Current | 670 µA at 94.4 ksps - enables multi-second battery life in portable instrumentation without sacrificing speed. |
| Reference Voltage | 4.096 V internal - matches standard 12-bit full-scale resolution (1 LSB = 1 mV), simplifying calibration and firmware scaling. |
| I²C Interface | Up to 1.7 MHz High-Speed Mode - reduces conversion readout time to <13 µs per sample, easing CPU load in microcontroller-based systems. |
| Input Configuration | 4 single-ended or 2 fully differential channels - allows flexible signal routing for thermocouple, RTD, or bridge-sensor interfaces. |
Pinout & Package
MAX1236KEUA+ is housed in an 8-pin µMAX® package (2.1mm × 2.1mm, 0.5mm pitch), optimized for high-density PCB layouts and thermal performance in compact industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | AIN0–AIN2 | Analog input channels 0–2; support unipolar single-ended or differential pairing with AIN3/REF in software-configured mode. |
| 4 | AIN3/REF | Configurable terminal: analog input channel 3 (single-ended) or reference I/O (internal/external ref selection via setup register). |
| 5 | SCL | I²C clock input; accepts 400kHz (Fast Mode) or 1.7MHz (High-Speed Mode) timing; requires external pull-up resistor. |
| 6 | SDA | I²C bidirectional data line; open-drain output; shares bus with other I²C slaves; requires external pull-up resistor. |
| 7 | GND | Analog/digital ground reference; must be connected to low-impedance system ground plane to maintain DC accuracy and noise immunity. |
| 8 | VDD | Positive supply (4.5V–5.5V); bypass with 0.1µF ceramic capacitor placed adjacent to pin to suppress switching noise and ensure stable conversion. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <1 µA during idle intervals-eliminates need for external power-gating logic in intermittent-sampling applications. |
| Internal 4.096V Reference | Provides stable, factory-trimmed reference with 25 ppm/°C tempco-removes external reference IC and associated layout area/cost. |
| Software-Configurable Inputs | Single-ended/differential and unipolar/bipolar modes selected via I²C register writes-enables one hardware design to serve multiple sensor types. |
| Track/Hold Acquisition | 800 ns acquisition time with ≤1.5 kΩ source impedance-supports direct connection to resistive sensors without buffer amplifiers. |
| Small µMAX Package | 8-pin, 2.1mm × 2.1mm footprint-fits within tight spacing constraints of handheld test equipment and modular PLC I/O cards. |
Applications
| Industrial Sensor Monitoring | Battery-Powered Data Loggers |
|---|---|
|
Use Scenario: Continuous voltage/current measurement from 4-channel analog sensors (e.g., pressure transducers, thermistors) in remote field nodes. IC Role / Device Role / Timing Role: Primary ADC capturing synchronized samples at up to 94.4 ksps with internal clock and I²C streaming to MCU. Use Value: 12-bit resolution and ±1 LSB INL enable detection of sub-millivolt drift in calibrated industrial sensors over extended temperature range. |
Use Scenario: Intermittent environmental logging (temperature, humidity, light) powered by coin-cell or Li-SOCl₂ batteries. IC Role / Device Role / Timing Role: Low-duty-cycle ADC activated on timer interrupt; AutoShutdown™ holds quiescent current below 1 µA between readings. Use Value: 670 µA active current and <1 µA shutdown current extend battery life to >5 years in 1-sample-per-minute operation. |
| Portable Medical Instrumentation | Programmable Logic Controller (PLC) I/O Modules |
|
Use Scenario: Signal conditioning for ECG front-end or blood glucose meter analog inputs requiring precise, low-noise digitization. IC Role / Device Role / Timing Role: 4-channel single-ended ADC interfacing to op-amp buffers; internal 4.096V reference ensures consistent gain calibration. Use Value: Fully differential T/H input stage rejects common-mode noise from body-coupled interference, improving SNR in clinical-grade measurements. |
Use Scenario: Analog input expansion for DIN-rail mounted PLCs handling 4–20 mA loop signals and thermocouple inputs. IC Role / Device Role / Timing Role: Compact ADC subsystem providing isolated 4-channel acquisition with I²C backplane interface to main controller. Use Value: 8-pin µMAX package enables dense channel packing (e.g., 8 channels per 25mm width) while maintaining isolation creepage requirements. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, multichannel, I²C ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-bit resolution, SPI interface, 2.7–5.25V supply, no internal reference - requires external ref and level-shifting for 5V systems. | Lower resolution limits use in precision sensor applications; SPI interface increases GPIO count vs. I²C's 2-wire simplicity. | Select only if 8-bit resolution suffices and SPI infrastructure already exists; not suitable for drop-in replacement. |
| MAX11602EEE+ | 12-bit, 4-channel, I²C, but 2.7–3.6V only supply and 2.048V internal reference - incompatible with 5V VDD and different full-scale scaling. | Designed for 3.3V systems; 2.048V ref yields 0.5 mV/LSB, requiring firmware re-scaling and limiting headroom for 5V-sourced signals. | Valid alternative only in 3.3V designs where 2.048V reference aligns with system architecture; not electrically compatible with MAX1236KEUA+. |
Compared with ADS7822U and MAX11602EEE+, the MAX1236KEUA+ uniquely combines 5V operation, integrated 4.096V reference, and I²C compatibility in an ultra-small µMAX package-making it optimal for space-constrained, high-accuracy 5V industrial data acquisition where pin count, power, and calibration simplicity are critical.
Availability
MAX1236KEUA+ is available at Aetrix Electronics and suitable for industrial sensor monitoring, battery-powered data loggers, and portable medical instrumentation requiring stable component supply and long-term production continuity.
Supply support for MAX1236KEUA+ 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 communications applications.
The MAX1236–MAX1239 family targets low-power, multichannel data acquisition in size- and energy-constrained systems-emphasizing integration (T/H, ref, clock, I²C), wide supply range, and guaranteed performance across −40°C to +85°C.
FAQ
What is the operating supply voltage range for the MAX1236KEUA+?
The MAX1236KEUA+ operates from a single supply of 4.5V to 5.5V. This range is fixed per its internal 4.096V reference architecture and absolute maximum ratings-operation below 4.5V or above 5.5V is not supported and may cause functional failure or damage. The MAX1236KEUA+ is not compatible with 3.3V systems.
Does the MAX1236KEUA+ support differential input mode?
Yes, the MAX1236KEUA+ supports fully differential input mode across two channels (e.g., AIN0–AIN1, AIN2–AIN3/REF) when configured via the SGL/DIF bit in the setup register. In this mode, it delivers true differential acquisition with common-mode rejection, and output coding is two's complement for bipolar operation or binary for unipolar.
What is the purpose of the AIN3/REF pin on the MAX1236KEUA+?
The AIN3/REF pin on the MAX1236KEUA+ is a dual-function terminal: it serves as analog input channel 3 in single-ended mode, or as the reference input/output when SEL[2:1] = 11 in the setup register. When used as REF, it can source or sink up to 2mA and must be decoupled with a 0.1µF capacitor and 2kΩ series resistor per the typical operating circuit.
How does AutoShutdown™ function in the MAX1236KEUA+?
AutoShutdown™ in the MAX1236KEUA+ automatically powers down the ADC core, reference, and oscillator between conversions when no I²C activity is detected. This reduces supply current to less than 1µA at low throughput rates-enabling ultra-low-power operation without requiring host MCU intervention or external enable control signals.
Is the MAX1236KEUA+ pin-compatible with other devices in the MAX1236–MAX1239 family?
No-the MAX1236KEUA+ uses an 8-pin µMAX package and is pin-compatible only with MAX1237EUA+ (same package, 2.7–3.6V, 2.048V ref). It is not pin-compatible with the 16-pin QSOP variants (MAX1238/MAX1239), which have different pin counts, layouts, and channel configurations.
MAX1236KEUA+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tube
- Product Status:
- Obsolete
- Number of Bits:
- 12
- Sampling Rate (Per Second):
- 94.4k
- Number of Inputs:
- 2, 4
- Input Type:
- Differential, Single Ended
- Data Interface:
- I2C
- Configuration:
- S/H-ADC
- Ratio - S/H:ADC:
- 1:1
- Number of A/D Converters:
- 1
- Architecture:
- SAR
- Reference Type:
- External, Internal
- Voltage - Supply, Analog:
- 5V
- Voltage - Supply, Digital:
- 5V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1236KEUA+ FAQ
1.How can I place an order for MAX1236KEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1236KEUA+ 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 MAX1236KEUA+ reliable?
The price and inventory of MAX1236KEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1236KEUA+ is usually 5 days.
3.What payment methods are accepted for MAX1236KEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1236KEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1236KEUA+?
MAX1236KEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1236KEUA+ 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 MAX1236KEUA+?
For technical support, including MAX1236KEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1236KEUA+ requirements.
6.How does Aetrix verify that MAX1236KEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX1236KEUA+ 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 MAX1236KEUA+ meets industry standards.
7.What is the process for return or replacement of MAX1236KEUA+?
All MAX1236KEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1236KEUA+, 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 MAX1236KEUA+ part is unused and in its original packaging.
Return procedure for MAX1236KEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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