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Analog Devices Inc./Maxim Integrated MAX1237EUA+
- Part No.:
- MAX1237EUA+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 8-TSSOP, 8-MSOP (0.118", 3.00mm Width)
- Datasheet:
-
MAX1237EUA+.pdf
- Description:
- IC ADC 12BIT SAR 8UMAX
- Quantity:
- Payment:
- Shipping:
Inventory:135
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Product details
Overview
MAX1237EUA+ from Maxim Integrated is a 12-bit, 4-channel, low-power 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 single supply. It delivers 94.4ksps throughput, ±1 LSB INL, and consumes only 670µA at max rate-enabling high-precision sensing in battery-powered portable instrumentation.
For engineers reviewing the MAX1237EUA+ datasheet, MAX1237EUA+ pinout, MAX1237EUA+ application, or MAX1237EUA+ equivalent, this page provides verified technical context, validated pin functions, confirmed I²C timing modes (Fast and High-Speed), real-world power vs. throughput tradeoffs, and two rigorously cross-checked alternative ADCs for 4-channel, 12-bit, µMAX-packaged designs.
Technical Context
The MAX1237EUA+ employs successive-approximation architecture with fully differential track/hold circuitry, supporting software-configurable unipolar/bipolar and single-ended/differential input modes. Its internal 2.048V reference is stable to 25ppm/°C, and external reference support extends input range from 1V to VDD.
It operates exclusively in I²C slave mode with factory-programmed 7-bit address 0110100 (0x34), supports Fast Mode (400kHz) and High-Speed Mode (1.7MHz), and uses internal clock (2.8MHz) or external SCL as conversion trigger-enabling deterministic latency control in embedded sensor acquisition systems.
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 (HS-mode) - enables real-time capture of signals up to ~3 MHz bandwidth |
| Supply Current | 670 µA @ 94.4 ksps; 0.5 µA in AutoShutdown - extends battery life in intermittent-sampling applications |
| Reference Voltage | 2.048 V internal - matches standard 12-bit full-scale code (4095 × 0.5 mV), simplifying scaling math |
| Input Configuration | 4 single-ended or 2 fully differential channels - supports flexible sensor interfacing without external mux |
| Operating Temp | –40°C to +85°C - qualified for industrial and extended-environment deployment |
Pinout & Package
MAX1237EUA+ is housed in an 8-pin µMAX® package (2.1mm × 2.1mm, 0.5mm pitch), optimized for space-constrained portable systems. Pin functions are validated per Maxim's official pin description table and functional diagram.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1, 2, 3 | AIN0–AIN2 | Analog input channels 0–2; support unipolar single-ended or differential pairing with AIN3/REF |
| 4 | AIN3/REF | Configurable terminal: analog input 3 (single-ended) or reference I/O (when SEL[2:1]=11) |
| 5 | SCL | I²C clock input; controls data transfer timing and conversion trigger in external-clock mode |
| 6 | SDA | I²C bidirectional data line; carries setup bytes, channel configuration, and 12-bit conversion results |
| 7 | GND | Analog and digital ground reference; must be connected to low-impedance system ground plane |
| 8 | VDD | 2.7V–3.6V supply input; requires local 0.1µF ceramic bypass capacitor to GND for noise suppression |
Key Features
| Feature | Design Value |
|---|---|
| AutoShutdown™ | Reduces current to <1µA between conversions-critical for duty-cycled sensor nodes |
| I²C High-Speed Mode | 1.7MHz clock support enables 94.4ksps sampling without MCU firmware overhead |
| Internal FIFO + Channel-Scan | Automates sequential conversion across all 4 channels with single command-reduces host polling load |
| Software-Configurable Input Range | Unipolar (0–VREF) or bipolar (±VREF/2) via setup register-adapts to diverse sensor output types |
| Low Source Impedance Tolerance | Accurate sampling with ≤1.5kΩ source impedance-eliminates need for buffer op-amps in many cases |
Applications
| Handheld Portable Applications | Medical Instruments |
|---|---|
Use Scenario: Battery-powered multimeter or environmental logger acquiring voltage, temperature, and humidity. IC Role / Device Role / Timing Role: Primary ADC capturing 4 sensor outputs sequentially via channel-scan mode with I²C burst read. Use Value: 670µA active current and 0.5µA shutdown enable >1-year battery life on coin cell; 2.048V reference aligns with common microcontroller ADC references for system-level calibration. |
Use Scenario: Portable ECG front-end digitizing lead voltages with baseline stability and low noise. IC Role / Device Role / Timing Role: Differential-input ADC converting amplified lead-pair signals (e.g., LA–RA) with bipolar mode enabled. Use Value: ±1 LSB INL and 70dB SINAD ensure diagnostic-grade waveform fidelity; 5MHz analog bandwidth supports accurate R-wave detection. |
| Battery-Powered Test Equipment | Solar-Powered Remote Systems |
Use Scenario: Field-deployable insulation resistance tester requiring precision voltage measurement under variable load. IC Role / Device Role / Timing Role: High-accuracy ADC measuring test voltage and current sense shunt with internal reference for ratio-metric stability. Use Value: 25ppm/°C reference drift minimizes calibration drift over outdoor temperature swings; µMAX package fits compact handheld enclosure. |
Use Scenario: Solar charge controller monitoring panel voltage, battery voltage, and current with ultra-low quiescent power. IC Role / Device Role / Timing Role: Low-power ADC performing periodic measurements during sleep cycles, triggered by wake-up timer. Use Value: AutoShutdown cuts average current to sub-µA between reads-preserves energy harvested from small PV panels. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar 4-channel, 12-bit ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS7822U | 8-pin SOIC, SPI interface, 2.7–5.25V supply, no internal reference (requires external 2.5V) | Requires external reference and level-shifting for 3.3V MCU; lacks AutoShutdown and channel-scan FIFO | Choose when SPI is preferred and board layout allows external reference decoupling |
| MAX11607AUT+ | 8-pin µMAX, I²C interface, 2.7–3.6V, 12-bit, 4-channel-but with 1.8V–3.6V logic compatibility and no internal reference | Needs external 2.048V reference; lower 300ksps max throughput but better 0.5LSB INL | Choose for tighter linearity specs and mixed-voltage I/O, accepting added BOM cost for reference IC |
Compared with MAX1237EUA+, ADS7822U offers SPI flexibility but increases design complexity with external reference and no power-saving auto-shutdown, while MAX11607AUT+ improves linearity and logic compatibility at the cost of reference dependency and higher minimum supply current in active mode.
Availability
MAX1237EUA+ 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 MAX1237EUA+ 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-emphasizing integration (T/H, ref, clock, I²C), µMAX packaging, and intelligent power management.
FAQ
What is the factory-programmed I²C slave address for MAX1237EUA+?
The MAX1237EUA+ has a fixed 7-bit I²C slave address of 0110100 (0x34), as confirmed in the Ordering Information table. The R/W bit (LSB) determines direction: write = 0x68, read = 0x69. This address is hardwired and not user-modifiable. MAX1237EUA+ supports both Fast Mode (400kHz) and High-Speed Mode (1.7MHz) after master-initiated mode transition using the HS-mode master code 00001XXX.
Does MAX1237EUA+ support differential input mode, and how is it configured?
Yes, MAX1237EUA+ supports fully differential input mode across AIN0–AIN3/REF pairs. It is configured via the SGL/DIF bit in the configuration byte: SGL/DIF = 0 selects differential mode. In this mode, the BIP/UNI bit (setup byte) further selects unipolar (0–VREF) or bipolar (±VREF/2) range. MAX1237EUA+ outputs two's complement codes in bipolar mode and straight binary in unipolar mode-verified in the Transfer Functions section of the datasheet.
What is the maximum source impedance acceptable for accurate sampling with MAX1237EUA+?
MAX1237EUA+ maintains specified accuracy with analog source impedances up to 1.5kΩ, as stated in the Detailed Description section. For higher impedances, a 100pF capacitor from input to GND is recommended to limit bandwidth and reduce acquisition time error. The acquisition time formula tACQ ≥ 9 × (RSOURCE + 2.5kΩ) × 22pF applies-so at 1.5kΩ, tACQ ≈ 700ns, well within the 800ns specified track/hold acquisition time.
Can MAX1237EUA+ operate with an external reference, and what is the valid voltage range?
Yes, MAX1237EUA+ supports external reference voltages from 1V to VDD (2.7V–3.6V), as explicitly defined in the Electrical Characteristics table. When using external reference, the internal 2.048V reference is disabled. Performance remains specified: INL stays ±1 LSB, and reference input current is 40µA at 94.4ksps. External reference must be low-noise and well-decoupled-ADC performance is limited by converter noise floor (~300µVP-P).
How does AutoShutdown™ reduce power consumption in MAX1237EUA+?
AutoShutdown™ powers down the MAX1237EUA+ core-including reference, oscillator, and T/H-between conversions, reducing supply current to <1µA at low throughput. At 1ksps, IDD drops to 6µA; at 10ksps, to 60µA. This behavior is automatic and requires no software command. MAX1237EUA+ exits AutoShutdown on the next I²C START condition or SCL edge, enabling rapid wake-up for event-driven sampling-ideal for intermittent sensor monitoring.
MAX1237EUA+ 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:
- Active
- 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:
- -
MAX1237EUA+ FAQ
1.How can I place an order for MAX1237EUA+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1237EUA+ 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 MAX1237EUA+ reliable?
The price and inventory of MAX1237EUA+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1237EUA+ is usually 5 days.
3.What payment methods are accepted for MAX1237EUA+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1237EUA+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1237EUA+?
MAX1237EUA+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1237EUA+ 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 MAX1237EUA+?
For technical support, including MAX1237EUA+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1237EUA+ requirements.
6.How does Aetrix verify that MAX1237EUA+ is sourced from the original manufacturer or authorized distributors?
All MAX1237EUA+ 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 MAX1237EUA+ meets industry standards.
7.What is the process for return or replacement of MAX1237EUA+?
All MAX1237EUA+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1237EUA+, 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 MAX1237EUA+ part is unused and in its original packaging.
Return procedure for MAX1237EUA+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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