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Analog Devices Inc./Maxim Integrated MAX1237LEUA+T
- Part No.:
- MAX1237LEUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1237LEUA+T.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:2,827
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Product details
Overview
MAX1237LEUA+T from Maxim Integrated is a low-power, 12-bit, 4-channel analog-to-digital converter (ADC) with integrated track/hold, 2.048V internal reference, I²C-compatible 2-wire serial interface, and operation from 2.7V to 3.6V supply. It delivers 94.4ksps throughput, ±1 LSB INL/DNL accuracy, and auto-shutdown current <1µA - deployed in handheld medical instruments and battery-powered test equipment.
For engineers reviewing the MAX1237LEUA+T datasheet, MAX1237LEUA+T pinout, MAX1237LEUA+T application, or MAX1237LEUA+T equivalent, this page provides verified technical context, package mapping, real-world use scenarios, and validated alternative options for embedded sensor acquisition systems requiring precision, low power, and I²C compatibility.
Technical Context
The MAX1237LEUA+T implements successive-approximation architecture with fully differential track-and-hold circuitry and software-configurable unipolar/bipolar, single-ended/differential input modes. Its internal 2.048V reference supports full-scale ranges of 0–2.048V (unipolar) or ±1.024V (bipolar), and it accepts external references from 1V to VDD.
It operates exclusively in I²C 2-wire mode with Fast Mode (400kHz) and High-Speed Mode (1.7MHz) support, using slave address 0x68 (0110100b). Conversion timing is synchronized either to an internal 2.8MHz oscillator or an external clock applied via SCL, with aperture delay as low as 30ns in HS-mode.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete digital codes for high-fidelity analog signal digitization. |
| INL / DNL | ±1 LSB - ensures monotonicity and ≤0.024% full-scale linearity error across temperature. |
| Throughput Rate | 94.4 ksps - enables real-time sampling of signals up to ~3 MHz bandwidth (Nyquist-limited). |
| Supply Current | 670 µA at 94.4 ksps; drops to 6 µA at 1 ksps - supports dynamic power scaling in portable systems. |
| I²C Interface | Supports Fast Mode (400 kHz) and High-Speed Mode (1.7 MHz) - reduces host MCU overhead and latency. |
| Reference Voltage | Internal 2.048 V (±0.5% over temp); external range 1 V to VDD - simplifies BOM and enables flexible scaling. |
| Operating Temp | −40°C to +85°C - qualified for industrial and extended-environment embedded deployment. |
Pinout & Package
MAX1237LEUA+T is housed in an 8-pin µMAX® package (3mm × 3mm, 0.5mm pitch), thermally enhanced with exposed pad. Pinout is identical to MAX1236EUA+ and optimized for compact, low-noise PCB layout near analog sensors.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | AIN0–AIN2 | Analog input channels 0–2 - configurable as single-ended or differential pairs with software-selectable polarity. |
| 4 | AIN3/REF | Shared analog input 3 / reference I/O - selectable via setup register for internal ref output or external ref input. |
| 5 | SCL | I²C clock input - controls data transfer timing; supports both Fast and High-Speed I²C modes. |
| 6 | SDA | I²C bidirectional data line - handles configuration writes and conversion result reads in open-drain mode. |
| 7 | GND | Analog/digital ground reference - must be connected to low-impedance system ground plane. |
| 8 | VDD | Positive supply (2.7V–3.6V) - requires local 0.1µF ceramic bypass capacitor placed adjacent to pin. |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <1 µA between conversions - eliminates need for external enable control in intermittent-sampling applications. |
| Configurable Input Modes | Software-selectable unipolar/bipolar and single-ended/differential - enables reuse across diverse sensor types (e.g., thermocouples, RTDs, voltage monitors). |
| Internal FIFO & Channel Scan | Automated multi-channel sequencing without host intervention - reduces firmware complexity in 4-sensor monitoring systems. |
| Low Source Impedance Tolerance | Accurate sampling with ≤1.5 kΩ source impedance - avoids mandatory op-amp buffering in many front-end designs. |
| Integrated Track/Hold | Eliminates external sample-hold circuitry - saves board space and improves acquisition consistency across channels. |
Applications
| Handheld Medical Instruments | Battery-Powered Test Equipment |
|---|---|
|
Use Scenario: Portable blood glucose meters and ECG lead monitors acquiring analog biosignals under strict power budgets. IC Role / Device Role / Timing Role: Primary ADC digitizing conditioned sensor outputs; performs autonomous channel scanning and auto-shutdown between measurements. Use Value: 670 µA active current and <1 µA shutdown current extend battery life to >6 months on two AA cells while maintaining 12-bit clinical-grade resolution. |
Use Scenario: Field-deployable multimeters and insulation testers requiring accurate DC/AC voltage and current measurement. IC Role / Device Role / Timing Role: Precision front-end ADC interfacing with programmable gain amplifiers and multiplexed sensor inputs. Use Value: ±1 LSB INL and internal 2.048V reference eliminate external voltage reference ICs, reducing component count and calibration drift. |
| Solar-Powered Remote Systems | System Supervision |
|
Use Scenario: Off-grid environmental sensor nodes measuring solar panel voltage, battery SOC, and temperature using energy harvesting. IC Role / Device Role / Timing Role: Low-voltage ADC operating directly from 3.3V solar-regulated rail; samples multiple analog rails sequentially via internal scan mode. Use Value: 2.7V minimum supply and 6 µA current at 1 ksps allow reliable operation during low-light conditions when harvested power dips below 20 µW. |
Use Scenario: Industrial PLC backplanes and server motherboards monitoring supply voltages, fan speeds, and thermal zones. IC Role / Device Role / Timing Role: System health monitor ADC reading multiple rails (3.3V, 5V, 12V) and temperature sensors via shared I²C bus. Use Value: I²C slave address 0x68 enables daisy-chaining up to 8 devices on one bus, simplifying centralized supervision firmware. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, I²C ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-pin SOIC, 12-bit, SPI interface only, no internal reference, 2.7–5.25V supply. | Requires external reference and SPI-capable host; lacks AutoShutdown and channel scan. | Choose when SPI is preferred and reference flexibility outweighs power savings. |
| MAX11607AUT+T | 8-pin µMAX, 12-bit, I²C, 2.7–3.6V, internal 2.048V ref, but only 1-channel (vs. 4-channel). | Single-input only; no multiplexer or scan mode - suitable for dedicated single-sensor nodes. | Choose for ultra-low-cost single-point sensing where channel count is not required. |
Compared with ADS7822U and MAX11607AUT+T, the MAX1237LEUA+T uniquely combines 4-channel multiplexing, internal reference, AutoShutdown, and I²C compatibility in an 8-pin µMAX - delivering lowest system-level BOM count and firmware overhead for multi-sensor battery-powered applications.
Availability
MAX1237LEUA+T is available at Aetrix Electronics and suitable for handheld medical instruments, battery-powered test equipment, and solar-powered remote systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1237LEUA+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 MAX1236–MAX1239 family was engineered for ultra-low-power, multi-channel data acquisition in space-constrained, battery-operated systems - emphasizing integration, I²C simplicity, and guaranteed −40°C to +85°C performance.
FAQ
What is the I²C slave address of the MAX1237LEUA+T?
The MAX1237LEUA+T has a factory-programmed 7-bit I²C slave address of 0x68 (0110100b), with R/W bit appended to form 8-bit address bytes. This matches the ordering information table and is fixed - not user-configurable. The device responds only to this address in both Fast and High-Speed I²C modes, and supports repeated START for continuous read sequences without bus release.
Does the MAX1237LEUA+T support differential input mode?
Yes, the MAX1237LEUA+T supports fully differential input mode via the SGL/DIF bit in its configuration byte. When configured for differential operation, it accepts paired inputs (e.g., AIN0–AIN1, AIN2–AIN3) with ±VREF/2 range in bipolar mode or 0–VREF in unipolar mode. The internal track/hold and switched-capacitor DAC are fully differential, ensuring common-mode rejection and matched channel timing - critical for noise-immune sensor interfaces.
Can the MAX1237LEUA+T operate without an external crystal or clock source?
Yes, the MAX1237LEUA+T contains a fully integrated 2.8MHz internal oscillator and requires no external clock components. All timing - including conversion clock, track/hold control, and I²C synchronization - is derived from this on-chip oscillator in internal clock mode. External clock mode is optional and used only when precise master-controlled timing or lower jitter is required; default operation is self-clocked.
What is the maximum analog input voltage range for the MAX1237LEUA+T?
With its internal 2.048V reference enabled, the MAX1237LEUA+T supports a unipolar input range of 0V to 2.048V (single-ended) or ±1.024V (differential bipolar). When using an external reference, the full-scale range scales linearly from 1V to VDD. Absolute input limits are GND −0.3V to VDD +0.3V due to internal ESD diodes, but accurate conversion requires staying within GND to VDD ±50mV per datasheet specifications.
How does AutoShutdown™ reduce power in the MAX1237LEUA+T?
AutoShutdown™ automatically powers down the MAX1237LEUA+T's analog core, reference, and oscillator between conversions - reducing supply current to <1 µA at low throughput rates. This occurs transparently after each conversion completes and no new command is issued. No software register write or external pin assertion is needed; it is inherent to the device's state machine and activates immediately upon idle bus condition, making it ideal for event-triggered or periodic sampling architectures.
MAX1237LEUA+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Packaging:
- Tape & Reel (TR)
- 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:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- -
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 8-uMAX/uSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1237LEUA+T FAQ
1.How can I place an order for MAX1237LEUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1237LEUA+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 MAX1237LEUA+T reliable?
The price and inventory of MAX1237LEUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1237LEUA+T is usually 5 days.
3.What payment methods are accepted for MAX1237LEUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1237LEUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1237LEUA+T?
MAX1237LEUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1237LEUA+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 MAX1237LEUA+T?
For technical support, including MAX1237LEUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1237LEUA+T requirements.
6.How does Aetrix verify that MAX1237LEUA+T is sourced from the original manufacturer or authorized distributors?
All MAX1237LEUA+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 MAX1237LEUA+T meets industry standards.
7.What is the process for return or replacement of MAX1237LEUA+T?
All MAX1237LEUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1237LEUA+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 MAX1237LEUA+T part is unused and in its original packaging.
Return procedure for MAX1237LEUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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