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Analog Devices Inc./Maxim Integrated MAX1401EAI+
- Part No.:
- MAX1401EAI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1401EAI+.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:1,252
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Product details
Overview
MAX1401EAI+ from Maxim Integrated is an 18-bit, sigma-delta analog-to-digital converter optimized for low-power, high-precision industrial sensing. It delivers true 16-bit accuracy at up to 480 samples per second (sps), supports three fully differential or five pseudo-differential input channels with programmable gain (1×–128×), and operates from a single +3V supply. It is used in portable weigh scales and loop-powered pressure transducers requiring high noise immunity and on-chip calibration.
For engineers reviewing the MAX1401EAI+ datasheet, MAX1401EAI+ pinout, MAX1401EAI+ application, or MAX1401EAI+ equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (e.g., 480sps/16-bit, 50Hz/60Hz notch filtering), real-world use cases, and two rigorously cross-checked alternative ADCs for precision multichannel measurement systems.
Technical Context
The MAX1401EAI+ employs a sigma-delta modulator with a digital decimation filter whose user-selectable decimation factor trades resolution for output data rate - enabling true 16-bit performance at 480sps or higher throughput at reduced resolution. Its modulator sampling frequency is configurable for lowest power (250µA operating current) or highest throughput.
It integrates three fully differential signal input channels (expandable to five pseudo-differential via AIN6 common node) plus two dedicated fully differential calibration channels (CALOFF±, CALGAIN±). The device provides direct access to the internal multiplexer output (MUXOUT±) and ADC input terminals (ADCIN±), supporting external signal conditioning before digitization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit sigma-delta architecture with no missing codes guaranteed; delivers 16-bit effective accuracy at 480sps. |
| Input Channels | 3 fully differential or 5 pseudo-differential signal inputs + 2 auxiliary calibration channels (CALOFF±, CALGAIN±). |
| Programmable Gain | 1× to 128× in discrete steps; enables flexible sensor interface scaling without external amplifiers. |
| Power Consumption | 250µA quiescent current in active mode; 2µA in power-down mode - suitable for battery-operated instruments. |
| Line Rejection | 150dB normal-mode rejection at 50Hz/60Hz via programmable digital filter notches - eliminates need for external line-frequency filtering. |
| Reference Input | Full-scale reference range of ±1.25V (REFIN+ − REFIN−); fully differential, buffered inputs support stable ratiometric measurements. |
| Serial Interface | SPI™/QSPI™-compatible 3-wire interface (SCLK, DIN, DOUT) with interrupt-driven data ready signaling (INT pin). |
Pinout & Package
The MAX1401EAI+ is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN5 | Differential/pseudo-differential analog inputs | Support independent channel configuration; AIN6 serves as common node for pseudo-differential mode or negative input for AIN5/AIN6 pair. |
| CALOFF±, CALGAIN± | Calibration channel inputs | Enable system-level offset and gain error correction; double as additional differential inputs when calibration is disabled. |
| MUXOUT± | Internal multiplexer output | Provides raw differential mux output for external signal processing (e.g., amplification, filtering) before re-injection via ADCIN±. |
| ADCIN± | Direct ADC analog inputs | Bypass multiplexer for critical signals; required when using MUXOUT± path or for highest integrity analog paths. |
| REFIN± | Differential reference inputs | Accept external reference voltage (e.g., +1.25V) - determines full-scale range and enables ratiometric operation with sensors. |
| SCLK/DIN/DOUT/CS/INT | Digital serial interface | 3-wire SPI-compatible interface with interrupt flag; supports continuous scanning and command-triggered conversions. |
| V+/VDD, AGND/DGND | Analog/digital power rails | Separate analog (+2.7V to +3.6V) and digital (+2.7V to +3.6V) supplies reduce noise coupling; dual ground pins improve PSR. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip offset DAC | Compensates input-referred DC offset up to 117% of selected full-scale range - eliminates manual zero-adjust in field-deployed instruments. |
| Configurable filter notches | Enables 50Hz/60Hz line-frequency rejection without external hardware - critical for AC mains–powered industrial environments. |
| Auto-channel scanning | Sequential conversion across all enabled inputs with minimal host intervention - reduces firmware overhead in multi-sensor systems. |
| Low-noise analog front-end | 16-bit noise-free resolution with <±0.001%FSR INL - ensures high-fidelity digitization of low-level transducer outputs (e.g., strain gauges, RTDs). |
| Transducer burn-out detection | Integrated current sources detect open-circuit sensors - enhances reliability in safety-critical pressure or load-cell applications. |
Applications
| Portable Weigh Scales | Loop-Powered Pressure Transducers |
|---|---|
Use Scenario: Battery-powered handheld scales measuring 0.1g resolution over 30kg range using strain-gauge bridges. IC Role / Device Role / Timing Role: Primary ADC acquiring differential bridge outputs with programmable gain (64×), on-the-fly offset cancellation, and 50Hz line rejection. Use Value: Enables 16-bit effective resolution at 480sps while consuming only 250µA - extends battery life beyond 12 months on two AA cells. |
Use Scenario: 4–20mA loop-powered pressure sensor module for HVAC control, operating from 12–24V loop supply. IC Role / Device Role / Timing Role: High-accuracy ADC digitizing amplified bridge output with integrated burn-out detection and ratiometric reference tracking. Use Value: Delivers <±0.001%FSR integral nonlinearity and 150dB 50Hz rejection - meets IEC 61000-4-8 immunity requirements without external filters. |
| Portable Industrial Data Loggers | High-Accuracy Temperature Monitoring Systems |
Use Scenario: Ruggedized field logger recording thermocouple, RTD, and voltage inputs across 8 channels with 24-hour battery autonomy. IC Role / Device Role / Timing Role: Multichannel sigma-delta ADC performing automatic channel sequencing, gain switching, and digital filtering in continuous mode. Use Value: Single-chip solution replaces discrete mux + amplifier + ADC stack - reduces BOM count by 7 components and PCB area by 35%. |
Use Scenario: Medical-grade temperature monitor using Pt100 RTDs in 4-wire configuration, requiring <0.02°C accuracy over −20°C to +85°C. IC Role / Device Role / Timing Role: Precision ADC with programmable excitation current, offset calibration, and matched gain/offset drift compensation (0.3µV/°C). Use Value: Achieves 16-bit noise-free resolution with <0.3µV/°C bipolar zero drift - eliminates need for external cold-junction compensation or recalibration. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-precision, multichannel sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IPWR | 24-bit resolution, 125kSPS max, 8-channel mux, fixed 1× gain, no on-chip offset DAC or line-notch filtering. | Better resolution/speed but lacks integrated 50/60Hz rejection and programmable offset compensation - requires external DSP or filtering. | Select when ultra-high resolution (>20-bit) and speed >1kSPS are primary; avoid if line-noise immunity or field calibration is required. |
| AD7798BRUZ | 16-bit resolution, 480sps max, 3-channel diff input, 1×–128× gain, 25µA typical current, no MUXOUT/ADCIN bypass path. | Lower power and cost, but lacks direct mux output access and transducer burn-out detection - limited for advanced sensor conditioning. | Select for cost-sensitive, low-power applications where external signal conditioning is acceptable and burn-out detection is unnecessary. |
Compared with ADS1258IPWR and AD7798BRUZ, the MAX1401EAI+ uniquely combines 16-bit accuracy at 480sps, on-chip 50/60Hz notch filtering, accessible MUXOUT/ADCIN nodes, and integrated burn-out detection - making it optimal for compact, self-calibrating industrial sensor nodes where layout space and EMI robustness are constrained.
Availability
MAX1401EAI+ is available at Aetrix Electronics and suitable for portable industrial instruments, loop-powered systems, and high-accuracy pressure transducers requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1401EAI+ 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 MAX1401 product line targets high-accuracy, low-power data acquisition in space-constrained, battery- or loop-powered instrumentation - emphasizing integrated calibration, noise immunity, and multichannel flexibility without external support components.
FAQ
What is the maximum output data rate with guaranteed 16-bit accuracy for the MAX1401EAI+?
The MAX1401EAI+ achieves true 16-bit accuracy with no missing codes at an output data rate of up to 480 samples per second (sps). This performance is specified under standard conditions: V+ = VDD = +3.3V, fCLKIN = 2.4576MHz, and TA = −40°C to +85°C. Higher data rates are possible but reduce effective resolution below 16 bits due to decimation filter configuration.
Does the MAX1401EAI+ support both differential and pseudo-differential input configurations?
Yes, the MAX1401EAI+ supports three fully differential input channels (AIN1/AIN2, AIN3/AIN4, AIN5/AIN6) that can be reconfigured into five pseudo-differential channels using AIN6 as a shared common node. This flexibility allows direct connection of single-ended sensors while preserving common-mode rejection - confirmed in the Pin Description and Applications sections of the official datasheet.
How does the MAX1401EAI+ achieve 50Hz and 60Hz line-frequency rejection without external filters?
The MAX1401EAI+ uses a programmable digital decimation filter with notch frequencies placed precisely at 50Hz and 60Hz (and harmonics) when configured with fCLKIN = 2.4576MHz or 1.024MHz and appropriate MF1/MF0 control bits. This provides ≥150dB normal-mode rejection - eliminating the need for external analog notch filters or post-processing in AC-mains–noisy environments.
What is the function of the MUXOUT± and ADCIN± pins on the MAX1401EAI+?
MUXOUT± provides direct access to the differential output of the internal analog multiplexer, allowing external signal conditioning (e.g., amplification, filtering) before digitization. ADCIN± accepts processed signals back into the ADC core, bypassing the mux entirely. This dual-path architecture enables custom front-end design while retaining the MAX1401EAI+'s precision conversion engine.
Can the MAX1401EAI+ perform system-level offset and gain calibration?
Yes, the MAX1401EAI+ includes two dedicated fully differential calibration channels: CALOFF± for offset correction and CALGAIN± for gain correction. When calibration is disabled, these pins serve as additional analog input channels. The on-chip offset DAC further enables software-controlled DC offset compensation up to 117% of full-scale - verified in Electrical Characteristics Table 1.
MAX1401EAI+ Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tube
- Product Status:
- Active
- Number of Bits:
- 18
- Sampling Rate (Per Second):
- 480
- Number of Inputs:
- 3, 5
- Input Type:
- Differential, Pseudo-Differential
- Data Interface:
- SPI
- Configuration:
- MUX-PGA-ADC
- Ratio - S/H:ADC:
- -
- Number of A/D Converters:
- 1
- Architecture:
- Sigma-Delta
- Reference Type:
- External
- Voltage - Supply, Analog:
- 2.7V ~ 3.6V
- Voltage - Supply, Digital:
- 2.7V ~ 3.6V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1401EAI+ FAQ
1.How can I place an order for MAX1401EAI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1401EAI+ 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 MAX1401EAI+ reliable?
The price and inventory of MAX1401EAI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1401EAI+ is usually 5 days.
3.What payment methods are accepted for MAX1401EAI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1401EAI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1401EAI+?
MAX1401EAI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1401EAI+ 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 MAX1401EAI+?
For technical support, including MAX1401EAI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1401EAI+ requirements.
6.How does Aetrix verify that MAX1401EAI+ is sourced from the original manufacturer or authorized distributors?
All MAX1401EAI+ 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 MAX1401EAI+ meets industry standards.
7.What is the process for return or replacement of MAX1401EAI+?
All MAX1401EAI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1401EAI+, 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 MAX1401EAI+ part is unused and in its original packaging.
Return procedure for MAX1401EAI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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