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Analog Devices Inc./Maxim Integrated MAX1237KEUA+
- Part No.:
- MAX1237KEUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1237KEUA+.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:1,646
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Product details
Overview
The MAX1237KEUA+ 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 <1µA shutdown current, targeting battery-powered portable instrumentation and system supervision.
For engineers reviewing the MAX1237KEUA+ datasheet, MAX1237KEUA+ pinout, MAX1237KEUA+ application, or MAX1237KEUA+ equivalent, this page provides verified electrical parameters, validated I²C timing modes (Fast and High-Speed), confirmed µMAX-8 package mapping, and real-world use context for handheld medical devices, solar-powered remote sensors, and RS-SI measurement circuits.
Technical Context
The MAX1237KEUA+ employs successive-approximation architecture with fully differential track/hold circuitry and a switched-capacitor DAC. Its analog input supports software-configurable unipolar/bipolar and single-ended/differential modes via setup and configuration registers.
It features dual-clock operation: internal 2.8MHz oscillator or external SCL-synchronized conversion clock. The I²C interface supports Fast Mode (400kHz) and High-Speed Mode (1.7MHz), with bus timing automatically configurable via master code handshake.
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 sampling of signals up to ~3 MHz bandwidth (Nyquist) |
| Supply Current | 670 µA at 94.4 ksps; 0.5 µA in AutoShutdown™ - extends battery life in intermittent-scan applications |
| Reference Voltage | 2.048 V internal (±40 mV tolerance at +25°C) - provides stable scaling without external components |
| I²C Clock Support | Up to 1.7 MHz (High-Speed Mode) - reduces data transfer time by >4× vs. standard 100 kHz I²C |
| Analog Input Range | 0 to VREF (unipolar, single-ended); ±VREF/2 (bipolar, differential) - supports both ground-referenced and floating sensor interfaces |
Pinout & Package
The MAX1237KEUA+ is housed in an 8-pin µMAX® package (2.1mm × 2.1mm, 0.5mm pitch), optimized for space-constrained portable designs. Thermal pad is not electrically connected.
| Pin | Circuit Role | Design Meaning |
|---|---|---|
| 1–3 | AIN0–AIN2 | Analog input channels 0–2; support single-ended or differential pairing with AIN3/REF |
| 4 | AIN3/REF | Configurable terminal: analog input channel 3 OR internal/external reference I/O (SEL[2:1]=11) |
| 5 | SCL | Serial clock input - controls I²C timing; must be pulled high; drives conversion clock in external mode |
| 6 | SDA | Serial data I/O - bidirectional; open-drain; requires external pull-up; carries setup/config/data bytes |
| 7 | GND | Analog/digital ground reference - must be low-impedance; decoupling capacitor placed adjacent to pin |
| 8 | VDD | Positive supply (2.7V–3.6V); bypassed with 0.1µF ceramic capacitor directly to GND |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces supply current to <1 µA between conversions - eliminates need for external power gating in low-duty-cycle sensing |
| Internal 2.048V Reference | 25 ppm/°C tempco, ±40 mV initial accuracy - enables precision measurements without external voltage reference IC |
| Software-Configurable Input Modes | Single-ended (4 ch) or fully differential (2 ch); unipolar/bipolar selection per setup byte - adapts to diverse sensor topologies without hardware change |
| Internal FIFO + Channel-Scan Mode | Automates sequential conversion across all 4 inputs - simplifies firmware for multi-sensor polling without host CPU intervention |
| 5 MHz Analog Input Bandwidth | Supports undersampling of RF/IF signals and accurate capture of fast transients - extends utility beyond baseband monitoring |
Applications
| Handheld Portable Medical Devices | Battery-Powered Test Equipment |
|---|---|
Use Scenario: Continuous vital sign acquisition (ECG, pulse oximetry) in palm-sized diagnostic tools with 24-hour battery life. IC Role / Device Role / Timing Role: Primary ADC capturing analog front-end outputs; synchronized to microcontroller via I²C; manages low-power scan cycles autonomously. Use Value: 670 µA active current and <1 µA shutdown enable extended runtime; 12-bit resolution supports clinical-grade SNR requirements. |
Use Scenario: Field-deployable multimeter or sensor calibrator operating from AA batteries or energy-harvesting sources. IC Role / Device Role / Timing Role: Signal digitizer for DC/AC voltage, current, and resistance measurement paths; configured for bipolar differential inputs to reject common-mode noise. Use Value: Internal 2.048V reference eliminates calibration drift from external references; ±1 LSB INL ensures traceable metrology-grade accuracy. |
| Solar-Powered Remote Monitoring Systems | Received-Signal-Strength Indicators (RSSI) |
Use Scenario: Wireless environmental node (temperature, humidity, light) powered by small solar panel + supercapacitor, transmitting hourly readings. IC Role / Device Role / Timing Role: Low-duty-cycle sensor hub ADC; wakes on timer interrupt, samples 4 sensors sequentially, then returns to AutoShutdown™. Use Value: 0.5 µA shutdown current minimizes quiescent drain; I²C High-Speed Mode cuts bus occupancy time, reducing RF transmission latency. |
Use Scenario: Real-time RF power level estimation in 2.4 GHz ISM-band receivers for link quality feedback. IC Role / Device Role / Timing Role: Digitizes detector diode output; operates in high-speed single-shot mode triggered by RSSI threshold crossing. Use Value: 94.4 ksps throughput captures fast AGC transients; 5 MHz input bandwidth preserves fidelity of pulsed RF envelope signals. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 12-bit, I²C-interfaced, low-power 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 host; lacks AutoShutdown™ and I²C compatibility | Select when SPI is preferred and board layout accommodates larger SOIC footprint |
| MAX11602EUA+ | 8-pin µMAX; 12-bit; I²C; 2.7–3.6V; 1.8V reference; 100ksps max; ±1 LSB INL | Lower reference voltage (1.8V) reduces dynamic range; identical package and pinout but different slave address (0x50 vs 0x34) | Use where lower full-scale range is acceptable and firmware can handle alternate I²C address |
Compared with ADS7822U and MAX11602EUA+, the MAX1237KEUA+ uniquely combines I²C High-Speed Mode, integrated 2.048V reference, and sub-µA shutdown in the compact µMAX-8 package-making it optimal for space- and power-constrained I²C-based sensor nodes requiring minimal BOM count.
Availability
The MAX1237KEUA+ is available at Aetrix Electronics and suitable for handheld portable medical devices, battery-powered test equipment, and solar-powered remote monitoring systems requiring stable component supply, long-term lifecycle support, and RoHS-compliant packaging.
Supply support for MAX1237KEUA+ 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 portable and energy-harvested systems-emphasizing integration (reference, T/H, clock), I²C efficiency, and guaranteed performance over –40°C to +85°C.
FAQ
What is the maximum sampling rate supported by the MAX1237KEUA+?
The MAX1237KEUA+ achieves a maximum throughput rate of 94.4 ksps when operating in I²C High-Speed Mode with external clock synchronization. This rate is sustained under full-load conditions (2.7V–3.6V supply, 2.048V reference, TA = –40°C to +85°C) and enables accurate digitization of signals with up to ~3 MHz bandwidth using undersampling techniques. The device defaults to slower Fast Mode (400 kHz) at power-up and requires explicit HS-mode master code handshake to enable 1.7 MHz operation.
Does the MAX1237KEUA+ require an external reference voltage?
No, the MAX1237KEUA+ does not require an external reference voltage-it integrates a factory-trimmed 2.048V internal reference with ±40 mV initial accuracy and 25 ppm/°C temperature coefficient. The AIN3/REF pin can be configured to output this reference for external circuit biasing, or accept an external reference from 1V to VDD. Using the internal reference eliminates BOM cost and PCB area while maintaining ±1 LSB INL performance across the industrial temperature range.
How many analog input channels does the MAX1237KEUA+ support?
The MAX1237KEUA+ supports four analog input channels (AIN0–AIN3). In single-ended mode, all four channels operate independently against GND. In fully differential mode, they pair as two differential inputs (AIN0–AIN1 and AIN2–AIN3). Channel selection is controlled via the CS[3:0] bits in the configuration register, and automatic channel-scan mode allows sequential conversion of all enabled inputs without host intervention.
What package type is used for the MAX1237KEUA+?
The MAX1237KEUA+ uses the 8-pin µMAX® package (2.1mm × 2.1mm body, 0.5mm lead pitch), a space-efficient surface-mount solution with exposed thermal pad (non-connected). This package matches the footprint of other MAX1236/MAX1237 variants and is compatible with standard reflow profiles. Pin 7 is GND and serves as the primary thermal and electrical reference plane; recommended layout includes direct connection to a solid ground plane beneath the device.
Can the MAX1237KEUA+ operate with a 5V supply?
No, the MAX1237KEUA+ is specified only for 2.7V to 3.6V single-supply operation. Applying 5V exceeds its absolute maximum VDD rating of +6V but violates the recommended operating condition and risks parametric degradation-including increased offset error, reduced reference stability, and potential damage to the internal 2.048V reference circuit. For 4.5V–5.5V operation, the pin-compatible MAX1236EUA+ (4-channel, 4.096V reference) or MAX1238EEE+ (12-channel) should be selected instead.
MAX1237KEUA+ 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:
- -
MAX1237KEUA+ FAQ
1.How can I place an order for MAX1237KEUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1237KEUA+ 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+ reliable?
The price and inventory of MAX1237KEUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1237KEUA+ is usually 5 days.
3.What payment methods are accepted for MAX1237KEUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1237KEUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1237KEUA+?
MAX1237KEUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1237KEUA+ 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+?
For technical support, including MAX1237KEUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1237KEUA+ requirements.
6.How does Aetrix verify that MAX1237KEUA+ is sourced from the original manufacturer or authorized distributors?
All MAX1237KEUA+ 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+ meets industry standards.
7.What is the process for return or replacement of MAX1237KEUA+?
All MAX1237KEUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1237KEUA+, 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+ part is unused and in its original packaging.
Return procedure for MAX1237KEUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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