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Analog Devices Inc./Maxim Integrated MAX1237KEUA+T
- Part No.:
- MAX1237KEUA+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1237KEUA+T.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,711
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Product details
Overview
The MAX1237KEUA+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-enabling high-precision sensing in battery-powered handheld instruments and portable medical devices.
For engineers reviewing the MAX1237KEUA+T datasheet, MAX1237KEUA+T pinout, MAX1237KEUA+T application, or MAX1237KEUA+T equivalent, this page provides verified electrical parameters, µMAX® package layout, I²C timing modes (Fast/High-Speed), unipolar/bipolar input configuration, and real-world use cases in solar-powered remote systems and system supervision circuits.
Technical Context
The MAX1237KEUA+T employs successive-approximation architecture with fully differential track-and-hold circuitry, supporting software-configurable single-ended (4-channel) or fully differential (2-channel) analog inputs. Its internal 2.048V reference enables precise 12-bit conversion across the full -40°C to +85°C industrial temperature range.
It features dual I²C operating modes: Fast Mode (400kHz) for basic control and High-Speed Mode (1.7MHz) for maximum 94.4ksps throughput. The device uses an internal oscillator or external clock, with aperture delay as low as 30ns in HS mode and acquisition time optimized for source impedances ≤1.5kΩ.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 12-bit - delivers 4096 discrete output codes for high-fidelity signal digitization |
| Sampling Rate | 94.4ksps (HS mode) - supports real-time monitoring of fast transients in sensor interfaces |
| INL / DNL | ±1 LSB - ensures monotonicity and end-point linearity critical for closed-loop control |
| Supply Current | 670µA at 94.4ksps; <1µA in AutoShutdown™ - extends battery life in portable applications |
| Reference Voltage | 2.048V internal (±0.04V over temp) - enables ratiometric measurements without external reference |
| I²C Interface | Supports Fast Mode (400kHz) and High-Speed Mode (1.7MHz) - reduces host MCU polling overhead |
| Analog Input Range | Unipolar 0–VREF or bipolar ±VREF/2 - configurable per channel for mixed-signal system flexibility |
Pinout & Package
The MAX1237KEUA+T is housed in an 8-pin µMAX® package (3mm × 3mm, 0.5mm pitch), optimized for space-constrained portable designs. Pin functions are validated per Maxim's official pin description table and typical operating circuit.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | AIN0–AIN2 | Analog input channels 0–2 - support single-ended or differential configurations via setup register |
| 4 | AIN3/REF | Configurable analog input 3 or reference I/O - selectable as internal ref output or external ref input |
| 5 | SCL | I²C clock input - controls data transfer timing; supports 400kHz/1.7MHz modes |
| 6 | SDA | I²C bidirectional data line - handles setup byte, conversion results, and acknowledge signaling |
| 7 | GND | Analog/digital ground reference - requires low-inductance connection to minimize noise coupling |
| 8 | VDD | Positive supply (2.7V–3.6V) - must be bypassed with 0.1µF ceramic capacitor near the pin |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <1µA between conversions - eliminates need for external power gating in intermittent sampling |
| Internal 2.048V Reference | 25ppm/°C tempco, ±0.04V tolerance - enables stable, self-contained measurement without external precision reference |
| Software-Configurable Inputs | Single-ended (4 ch) or fully differential (2 ch), unipolar/bipolar - adapts to diverse sensor topologies without hardware change |
| I²C High-Speed Mode | 1.7MHz clock rate with 30ns aperture delay - achieves 94.4ksps while minimizing bus occupancy vs. SPI alternatives |
| Low Source Impedance Tolerance | Accurate sampling with ≤1.5kΩ source impedance - avoids mandatory op-amp buffering in many sensor front-ends |
Applications
| Handheld Portable Applications | Medical Instruments |
|---|---|
|
Use Scenario: Battery-powered multimeter or environmental sensor node acquiring voltage, temperature, and humidity signals. IC Role / Device Role / Timing Role: Primary ADC converting analog sensor outputs to digital for microcontroller processing and wireless transmission. Use Value: 670µA active current and <1µA shutdown current extend single-cell Li-ion battery life to >1 year in sleep-wake cycles. |
Use Scenario: Portable ECG or pulse oximeter requiring accurate, low-noise analog front-end digitization. IC Role / Device Role / Timing Role: Signal-conditioning ADC capturing biopotential waveforms with ±1 LSB linearity and 5MHz input bandwidth. Use Value: Fully differential input mode rejects common-mode interference from body-coupled noise sources. |
| Battery-Powered Test Equipment | Solar-Powered Remote Systems |
|
Use Scenario: Field-deployable calibration tool measuring DC voltage/current with traceable accuracy. IC Role / Device Role / Timing Role: Precision measurement core using internal 2.048V reference for ratiometric scaling against known shunt resistors. Use Value: ±1 LSB INL and 25ppm/°C reference drift ensure calibration validity across industrial temperature ranges. |
Use Scenario: Off-grid telemetry unit monitoring solar panel voltage, battery SOC, and environmental conditions. IC Role / Device Role / Timing Role: Multi-channel sensor hub digitizing photovoltaic output, battery voltage, and temperature sensors. Use Value: 4-channel single-ended capability allows concurrent sampling of 4 independent analog sources with one IC. |
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, 2.7V–5.25V supply | Requires external reference and SPI host; lacks I²C compatibility and AutoShutdown™ | Choose when SPI is preferred and board already supports external reference routing |
| MAX11602EEE+ | 12-bit, 4-channel, I²C, 2.7V–3.6V, but 10ksps max rate and no internal reference | Lower throughput and external reference dependency limit use in high-speed or compact designs | Choose for cost-sensitive, low-throughput applications where reference is shared across multiple ICs |
Compared with ADS7822U and MAX11602EEE+, the MAX1237KEUA+T uniquely integrates I²C, 2.048V reference, and AutoShutdown™ in an 8-pin µMAX®, enabling faster development of ultra-low-power, space-constrained sensor nodes without reference or interface compromises.
Availability
The MAX1237KEUA+T is available at Aetrix Electronics and suitable for handheld portable applications, medical instruments, and battery-powered test equipment requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1237KEUA+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 demanding industrial, medical, and portable applications.
The MAX1236–MAX1239 family targets low-power, multi-channel data acquisition in space- and energy-constrained systems-delivering integrated references, I²C interfaces, and extended temperature operation without sacrificing resolution or accuracy.
FAQ
What is the maximum sampling rate supported by the MAX1237KEUA+T?
The MAX1237KEUA+T achieves up to 94.4ksps when operating in I²C High-Speed Mode (1.7MHz clock). This requires the bus master to issue the HS-mode master code (00001XXX) followed by a repeated START and slave address. In standard Fast Mode (400kHz), the maximum throughput drops to 22.2ksps. The MAX1237KEUA+T internal clock or external clock selection directly determines achievable rate.
Does the MAX1237KEUA+T require an external reference voltage?
No-the MAX1237KEUA+T includes a factory-trimmed 2.048V internal reference with ±0.04V tolerance and 25ppm/°C temperature coefficient, eliminating the need for external reference components in most applications. However, it also supports external reference voltages from 1V to VDD, allowing system-level ratiometric calibration or higher-accuracy reference substitution if required.
How many analog input channels does the MAX1237KEUA+T support?
The MAX1237KEUA+T supports four analog input channels (AIN0–AIN3), configurable in single-ended mode (four independent inputs) or fully differential mode (two differential pairs). Channel selection is controlled via the CS[3:0] bits in the configuration register, and AIN3/REF serves as either channel 3 or reference I/O depending on setup register settings.
What package type is used for the MAX1237KEUA+T?
The MAX1237KEUA+T is packaged in an 8-pin µMAX® (3mm × 3mm, 0.5mm pitch), a lead(Pb)-free/RoHS-compliant surface-mount package. Its compact footprint and thermal performance make it ideal for portable and space-constrained PCB layouts, and it shares pin compatibility with other MAX1236/MAX1237 variants in the same family.
Can the MAX1237KEUA+T operate in bipolar input mode?
Yes-but only in differential input mode. When SGL/DIF = 0, the BIP/UNI bit in the setup register selects bipolar operation, setting the input range to ±VREF/2 with two's complement output coding. In single-ended mode (SGL/DIF = 1), the MAX1237KEUA+T operates exclusively in unipolar mode (0V to VREF), regardless of BIP/UNI setting. This behavior is confirmed in the device's transfer function and configuration tables.
MAX1237KEUA+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:
- -
MAX1237KEUA+T FAQ
1.How can I place an order for MAX1237KEUA+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1237KEUA+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 MAX1237KEUA+T reliable?
The price and inventory of MAX1237KEUA+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1237KEUA+T is usually 5 days.
3.What payment methods are accepted for MAX1237KEUA+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1237KEUA+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1237KEUA+T?
MAX1237KEUA+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1237KEUA+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 MAX1237KEUA+T?
For technical support, including MAX1237KEUA+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1237KEUA+T requirements.
6.How does Aetrix verify that MAX1237KEUA+T is sourced from the original manufacturer or authorized distributors?
All MAX1237KEUA+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 MAX1237KEUA+T meets industry standards.
7.What is the process for return or replacement of MAX1237KEUA+T?
All MAX1237KEUA+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1237KEUA+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 MAX1237KEUA+T part is unused and in its original packaging.
Return procedure for MAX1237KEUA+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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