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Analog Devices Inc./Maxim Integrated MAX1237MEUA+
- Part No.:
- MAX1237MEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1237MEUA+.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:3,334
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Product details
Overview
The MAX1237MEUA+ from Maxim Integrated is a low-power, 12-bit, 4-channel analog-to-digital converter 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, and consumes only 670µA at max rate-enabling precision sensing in battery-powered portable instrumentation.
For engineers reviewing the MAX1237MEUA+ datasheet, MAX1237MEUA+ pinout, MAX1237MEUA+ application, or MAX1237MEUA+ equivalent, this page provides verified electrical parameters, µMAX® package layout, I²C timing modes (Fast/High-Speed), unipolar/bipolar software configuration, and real-world use cases in handheld medical devices and solar-powered remote monitoring systems.
Technical Context
The MAX1237MEUA+ employs successive-approximation architecture with fully differential track/hold circuitry and a switched-capacitor DAC. Its analog input multiplexer supports four single-ended or two fully differential channels, configurable via setup register bits SGL/DIF and BIP/UNI.
It operates in two clock modes: internal oscillator (2.8MHz) or external SCL-driven conversion; supports I²C Fast Mode (400kHz) and High-Speed Mode (1.7MHz); and features AutoShutdown™ reducing current to <1µA between conversions-critical for intermittent-sampling applications.
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 - enables real-time capture of signals up to 3 MHz bandwidth (SINAD >68dB) |
| Supply Current | 670 µA @ 94.4ksps - allows continuous high-speed sampling on coin-cell or Li-ion sources |
| Reference Voltage | 2.048 V internal - provides stable, factory-trimmed scaling with 25 ppm/°C tempco |
| I²C Interface | Supports Fast Mode (400kHz) and High-Speed Mode (1.7MHz) - reduces host MCU overhead and latency |
| Operating Temp | –40°C to +85°C - qualified for industrial and outdoor embedded deployment |
Pinout & Package
MAX1237MEUA+ is housed in an 8-pin µMAX® package (3mm × 3mm, 0.5mm pitch), optimized for space-constrained PCB layouts. Pin functions are validated per Maxim's official datasheet Rev 7 (19-2333).
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | AIN0–AIN2 | Analog input channels 0–2; support unipolar single-ended or differential configurations |
| 4 | AIN3/REF | Configurable as fourth analog input or reference voltage source/sink (2.048V) |
| 5 | SCL | I²C clock input - controls data transfer timing and mode selection (F/S or HS) |
| 6 | SDA | I²C bidirectional data line - carries setup bytes, channel scan commands, and 12-bit results |
| 7 | GND | Analog/digital ground reference - must be star-connected and decoupled with 0.1µF capacitor |
| 8 | VDD | Positive supply (2.7V–3.6V) - requires local 0.1µF ceramic bypass to GND near pin |
Key Features
| Feature | Design Value |
|---|---|
| Software-configurable input mode | Single-ended (4 ch) or fully differential (2 ch) via SGL/DIF bit - eliminates external mux or op-amp rework |
| AutoShutdown™ power management | Reduces IDD to <1µA between conversions - extends battery life in duty-cycled sensor nodes |
| Internal FIFO with channel-scan mode | Enables automatic round-robin sampling across all 4 inputs without host intervention - simplifies firmware |
| External reference support | Accepts 1V to VDD reference - permits system-level calibration or higher-precision external references |
| Low acquisition time | 800 ns track/hold acquisition - supports accurate sampling of fast transients with minimal settling delay |
Applications
| Handheld Portable Instruments | Medical Vital Sign Monitors |
|---|---|
Use Scenario: Battery-powered blood glucose meters and portable ECG recorders requiring compact, low-drain ADCs with clinical-grade linearity. IC Role / Device Role: Primary analog front-end digitizer for biopotential and electrochemical sensor signals. Use Value: ±1 LSB INL and 2.048V reference enable direct 12-bit resolution without external calibration; 670µA max current extends single-charge operation beyond 72 hours. |
Use Scenario: Wearable pulse oximeters and ambulatory BP cuffs needing reliable, low-noise conversion of weak analog biosignals. IC Role / Device Role: Signal acquisition engine interfacing photodiode and pressure transducer outputs to microcontroller. Use Value: Fully differential input mode rejects common-mode noise from body coupling; 5MHz analog bandwidth preserves pulse waveform fidelity. |
| Battery-Powered Test Equipment | Solar-Powered Remote Systems |
Use Scenario: Pocket-sized multimeters and insulation testers operating from AA batteries with multi-year shelf life. IC Role / Device Role: Core measurement ADC handling voltage, current, and resistance ranges via programmable gain stages. Use Value: Internal 2.048V reference eliminates external voltage reference IC; AutoShutdown cuts quiescent current to 0.5µA in standby - critical for energy harvesting sleep cycles. |
Use Scenario: Off-grid environmental sensors (temperature, humidity, irradiance) deployed in remote locations with solar charging. IC Role / Device Role: Low-power analog digitizer for multiple sensor inputs in ultra-low-duty-cycle telemetry nodes. Use Value: 4-channel capability consolidates sensor inputs onto one IC; 2.7V min supply ensures operation during low-battery brownout conditions. |
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, 200ksps, no internal reference | Requires external reference and SPI host; higher speed but less integration | Choose when SPI is preferred and board space allows external reference |
| MCP3221-AI/P | 8-pin PDIP, 12-bit, I²C, 1-channel, 188ksps, 2.7–5.5V, no internal ref | Single-input only; lacks channel scan, FIFO, and internal reference | Choose for simple single-sensor systems where cost and footprint are primary constraints |
Compared with ADS7822U and MCP3221-AI/P, the MAX1237MEUA+ uniquely integrates 4-channel multiplexing, 2.048V reference, AutoShutdown, and I²C High-Speed Mode-reducing BOM count and firmware complexity in multi-sensor, battery-sensitive designs.
Availability
MAX1237MEUA+ is available at Aetrix Electronics and suitable for handheld portable instruments, medical vital sign monitors, and battery-powered test equipment requiring stable component supply and long-term production continuity.
Supply support for MAX1237MEUA+ 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 was engineered for ultra-low-power, multi-channel data acquisition in space- and energy-constrained systems-emphasizing integrated references, I²C efficiency, and extended temperature reliability.
FAQ
What is the maximum sampling rate of the MAX1237MEUA+ and under what conditions?
The MAX1237MEUA+ achieves a maximum throughput rate of 94.4 ksps when operating in I²C High-Speed Mode (1.7 MHz SCL) with external clocking and internal reference enabled. This rate is confirmed in the Electrical Characteristics table under "Throughput Rate" with fSAMPLE = 94.4 ksps, and requires proper bus capacitance (≤400 pF) and master-mode initialization using the HS-mode master code (0000 1XXX).
Does the MAX1237MEUA+ support differential input mode, and how is it configured?
Yes, the MAX1237MEUA+ supports fully differential input mode across two channels (e.g., AIN0–AIN1, AIN2–AIN3/REF). Configuration is performed via the SGL/DIF bit in the setup byte: setting SGL/DIF = 0 selects differential operation. The BIP/UNI bit further determines unipolar (0 to VREF) or bipolar (±VREF/2) range, with two's complement output in bipolar mode.
What is the function of the AIN3/REF pin on the MAX1237MEUA+?
The AIN3/REF pin on the MAX1237MEUA+ serves a dual role: it functions as the fourth analog input (AIN3) in standard operation, or as a reference voltage source/sink (2.048 V) when selected via SEL[2:1] = 11 in the setup register. When used as REF, it must be decoupled to GND with a 0.1 µF capacitor and 2 kΩ series resistor per the Typical Operating Circuit.
How does AutoShutdown™ reduce power consumption in the MAX1237MEUA+?
AutoShutdown™ powers down the MAX1237MEUA+ between conversions, reducing supply current to less than 1 µA at low throughput rates. At 1 ksps, IDD drops to 6 µA; at 10 ksps, it is 60 µA. This dynamic power scaling is automatic and requires no host command-making it ideal for event-triggered or periodic sampling in battery-powered systems.
Is the MAX1237MEUA+ pin-compatible with other devices in the MAX1236–MAX1239 family?
Yes, the MAX1237MEUA+ shares identical 8-pin µMAX® pinout and register map with MAX1236EUA+, enabling direct substitution where supply voltage (2.7–3.6V vs. 4.5–5.5V) and reference (2.048V vs. 4.096V) requirements align. However, MAX1238/MAX1239 use 16-pin QSOP packages and are not pin-compatible.
MAX1237MEUA+ 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:
- 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:
- -
MAX1237MEUA+ FAQ
1.How can I place an order for MAX1237MEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1237MEUA+ 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 MAX1237MEUA+ reliable?
The price and inventory of MAX1237MEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1237MEUA+ is usually 5 days.
3.What payment methods are accepted for MAX1237MEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1237MEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1237MEUA+?
MAX1237MEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1237MEUA+ 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 MAX1237MEUA+?
For technical support, including MAX1237MEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1237MEUA+ requirements.
6.How does Aetrix verify that MAX1237MEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX1237MEUA+ 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 MAX1237MEUA+ meets industry standards.
7.What is the process for return or replacement of MAX1237MEUA+?
All MAX1237MEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1237MEUA+, 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 MAX1237MEUA+ part is unused and in its original packaging.
Return procedure for MAX1237MEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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