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Analog Devices Inc./Maxim Integrated MAX1236LEUA+
- Part No.:
- MAX1236LEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1236LEUA+.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:4,268
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Product details
Overview
The MAX1236LEUA+ 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/DNL accuracy, and auto-shutdown current below 1µA-designed for precision sensing in battery-constrained industrial monitoring systems.
For engineers reviewing the MAX1236LEUA+ datasheet, MAX1236LEUA+ pinout, MAX1236LEUA+ application, or MAX1236LEUA+ equivalent, this page provides verified electrical specifications, validated package mapping, confirmed I²C timing modes (Fast/High-Speed), real-world power consumption curves across sampling rates, and precise analog input configuration options (unipolar/bipolar, single-ended/differential).
Technical Context
The MAX1236LEUA+ employs successive-approximation architecture with fully differential track-and-hold circuitry and an internal 4.096V reference. Its 2-wire interface supports both Fast Mode (400kHz) and High-Speed Mode (1.7MHz), requiring explicit HS-mode master code (00001XXX) activation for full 94.4ksps throughput.
Analog input multiplexing supports four single-ended channels or two fully differential pairs, software-configurable via setup and configuration registers. Acquisition time depends on source impedance and clock mode: tACQ = 2/fSCL in external clock mode, with 5MHz small-signal bandwidth enabling undersampling of transient signals.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization |
| INL / DNL | ±1 LSB - ensures monotonicity and ≤0.024% full-scale linearity error across temperature |
| Throughput Rate | 94.4 ksps - maximum conversion rate achievable only in High-Speed I²C mode (1.7MHz) |
| Supply Current | 670 µA at 94.4ksps; drops to 6 µA at 1ksps - enables ultra-low-power operation in duty-cycled systems |
| Reference Voltage | 4.096 V internal - matches common microcontroller ADC reference domains and simplifies system-level scaling |
| Input Range | 0 to VREF (unipolar, single-ended); ±VREF/2 (bipolar, differential) - supports both ground-referenced and floating sensor interfaces |
| Operating Temp | -40°C to +85°C - qualified for extended industrial environments without derating |
Pinout & Package
The MAX1236LEUA+ is housed in an 8-pin µMAX® package (3mm × 3mm, 0.5mm pitch), optimized for space-constrained PCB layouts while maintaining thermal performance up to +85°C ambient.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1–3 | AIN0–AIN2 | Analog input channels 0–2; support unipolar single-ended or differential pair configurations |
| 4 | AIN3/REF | Configurable terminal: analog input channel 3 OR reference voltage output/input (SEL[2:1]=11) |
| 5 | SCL | I²C serial clock input - controls data transfer timing; must be pulled high externally |
| 6 | SDA | I²C bidirectional data line - requires external pull-up; supports Fast (400kHz) and High-Speed (1.7MHz) modes |
| 7 | GND | Analog/digital ground reference - must be connected to low-impedance system ground plane |
| 8 | VDD | Positive supply (4.5V–5.5V); bypass with 0.1µF ceramic capacitor placed adjacent to pin |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <1µA between conversions - eliminates need for external enable control in intermittent sampling |
| Internal 4.096V Reference | 25 ppm/°C tempco, 3.936V–4.256V tolerance - eliminates external reference component and associated layout area |
| Software-Configurable Input Modes | Single-ended/unipolar, differential/unipolar, or differential/bipolar via register writes - enables one hardware design to serve multiple sensor topologies |
| Track/Hold Acquisition | 800 ns acquisition time with ≤1.5kΩ source impedance - supports direct connection to resistive sensors and basic op-amp buffers |
| I²C Address Flexibility | Factory-programmed slave address 0110100 (7-bit) - allows coexistence with other I²C peripherals on shared bus |
Applications
| Industrial Sensor Node | Portable Data Logger |
|---|---|
|
Use Scenario: Remote temperature/humidity/pressure monitoring in factory-floor equipment using 4–20mA or mV-output transducers. IC Role / Device Role / Timing Role: Primary ADC capturing analog sensor outputs at 1–10ksps, interfacing directly to low-power MCU over I²C. Use Value: Internal 4.096V reference and ±1 LSB linearity ensure calibrated readings without calibration firmware; AutoShutdown cuts average current to ~60µA at 10ksps. |
Use Scenario: Battery-powered environmental logger recording thermocouple, RTD, and analog gas sensor outputs over multi-day deployments. IC Role / Device Role / Timing Role: Low-quiescent ADC managing four analog inputs with programmable scan sequence and FIFO buffering. Use Value: 670µA max active current and sub-1µA shutdown extend CR2032 battery life beyond 6 months; 8-pin µMAX fits compact enclosure footprints. |
| Medical Vital Sign Monitor | Energy Meter Front-End |
|
Use Scenario: Portable pulse oximeter or ECG front-end digitizing low-amplitude biopotential signals with high SNR requirements. IC Role / Device Role / Timing Role: Precision ADC configured for differential bipolar input to reject common-mode noise from electrode interfaces. Use Value: 70dB SINAD and 78dB SFDR meet clinical-grade signal fidelity; 5MHz input bandwidth supports accurate R-wave detection. |
Use Scenario: Residential smart meter measuring AC voltage/current waveforms via shunt or CT sensors for kWh calculation. IC Role / Device Role / Timing Role: Isolated analog input conditioner feeding into metrology MCU; operates in unipolar single-ended mode with external anti-alias filter. Use Value: 4.5–5.5V supply range aligns with isolated DC-DC rails; ±1 LSB INL ensures <0.1% energy measurement error across temperature. |
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-pin SOIC, 12-bit, SPI interface, 200ksps, 2.7–5.25V supply, no internal reference | Requires external reference and SPI host; higher speed but less integrated power management | Select when SPI interface is preferred and external reference is already present in design |
| MAX11607AUT+ | 8-pin µMAX, 12-bit, I²C, 94.4ksps, 2.7–3.6V supply, 2.048V internal reference | Lower supply voltage range and 2.048V reference - incompatible with 5V systems without level shifting | Select for 3.3V-only designs where 2.048V reference simplifies scaling with 3.3V MCUs |
Compared with ADS7822U and MAX11607AUT+, the MAX1236LEUA+ uniquely combines 5V operation, integrated 4.096V reference, and AutoShutdown in an 8-pin µMAX - reducing BOM count and PCB area while maintaining compatibility with legacy 5V industrial controllers.
Availability
MAX1236LEUA+ is available at Aetrix Electronics and suitable for industrial sensor nodes, portable data loggers, medical vital sign monitors, and energy meter front-ends requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1236LEUA+ 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, automotive, and communications markets.
The MAX1236–MAX1239 family was designed for low-power, multichannel data acquisition in space- and energy-constrained embedded systems - emphasizing integration (reference, T/H, clock), flexible I²C communication, and guaranteed performance across -40°C to +85°C.
FAQ
What is the correct I²C slave address for the MAX1236LEUA+?
The MAX1236LEUA+ has a factory-programmed 7-bit I²C slave address of 0110100 (0x34 in hexadecimal). The eighth bit is the R/W flag: write = 0x68, read = 0x69. This address is fixed and cannot be modified via pins or registers. Always verify bus arbitration and acknowledge behavior during initialization, especially when multiple I²C peripherals share the same bus.
Can the MAX1236LEUA+ operate with an external reference voltage?
Yes, the MAX1236LEUA+ supports external reference voltages from 1V to VDD (4.5V–5.5V). When using an external reference, configure SEL[2:1] = 00 in the setup register and apply the reference to the AIN3/REF pin. Note that internal reference must be disabled, and external reference stability directly impacts overall ADC accuracy - typical noise floor is 300µVP-P.
How does AutoShutdown™ work on the MAX1236LEUA+?
AutoShutdown™ automatically powers down the MAX1236LEUA+ between conversions when no I²C activity is detected, reducing supply current to less than 1µA. It activates after the conversion result is read and remains active until the next START condition is issued. No software command or register write is required - it is inherent to the device's I²C protocol handling.
What analog input configurations does the MAX1236LEUA+ support?
The MAX1236LEUA+ supports four single-ended inputs (AIN0–AIN3) or two fully differential pairs (e.g., AIN0–AIN1, AIN2–AIN3), selectable via the SGL/DIF bit. In differential mode, BIP/UNI configures unipolar (0 to VREF) or bipolar (±VREF/2) ranges. Single-ended mode is always unipolar and referenced to GND.
Is the MAX1236LEUA+ pin-compatible with other devices in the MAX1236–MAX1239 family?
No - the MAX1236LEUA+ (8-pin µMAX) is not pin-compatible with the 12-channel MAX1238/MAX1239 (16-pin QSOP). However, it shares identical pin functions and register map with the MAX1237LEUA+ (same package, 2.048V reference), enabling hardware reuse when switching reference voltage requirements.
MAX1236LEUA+ 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:
- -
MAX1236LEUA+ FAQ
1.How can I place an order for MAX1236LEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1236LEUA+ 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 MAX1236LEUA+ reliable?
The price and inventory of MAX1236LEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1236LEUA+ is usually 5 days.
3.What payment methods are accepted for MAX1236LEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1236LEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1236LEUA+?
MAX1236LEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1236LEUA+ 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 MAX1236LEUA+?
For technical support, including MAX1236LEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1236LEUA+ requirements.
6.How does Aetrix verify that MAX1236LEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX1236LEUA+ 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 MAX1236LEUA+ meets industry standards.
7.What is the process for return or replacement of MAX1236LEUA+?
All MAX1236LEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1236LEUA+, 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 MAX1236LEUA+ part is unused and in its original packaging.
Return procedure for MAX1236LEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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