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Analog Devices Inc./Maxim Integrated MAX1401EAI+T
- Part No.:
- MAX1401EAI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1401EAI+T.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,908
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Product details
Overview
MAX1401EAI+T from Maxim Integrated is an 18-bit, sigma-delta analog-to-digital converter optimized for low-power, multichannel 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-resolution DC measurement with line-frequency rejection.
For engineers reviewing the MAX1401EAI+T datasheet, MAX1401EAI+T pinout, MAX1401EAI+T application, or MAX1401EAI+T equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (continuous/commanded conversion), real-world noise performance (0.5 µVRMS), and precise decimation filter behavior-including 50/60Hz notch capability at 2.4576MHz clock-enabling direct design-in without datasheet cross-checking.
Technical Context
The MAX1401EAI+T implements a sigma-delta modulator with on-chip digital decimation filtering, where the user-selectable decimation factor trades resolution for output data rate. Its modulator sampling frequency is configurable for lowest power (250µA operating current) or highest throughput (480sps at 16-bit accuracy).
It integrates a flexible input multiplexer supporting three independent fully differential channels (or five pseudo-differential), two dedicated calibration channels (CALOFF±, CALGAIN±), and direct access to MUXOUT± and ADCIN± for external signal conditioning. The SPI/QSPI-compatible 3-wire serial interface enables seamless integration with microcontrollers in space-constrained embedded systems.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit native; 16-bit guaranteed no-missing-codes performance at ≤480sps |
| Supply Voltage | +2.7V to +3.6V analog/digital supplies-supports single +3V operation with rail-to-rail compatibility |
| Input Channels | 3 fully differential or 5 pseudo-differential signal inputs + 2 calibration channels (CALOFF±, CALGAIN±) |
| Programmable Gain | 1×, 2×, 4×, 8×, 16×, 32×, 64×, 128×-enables direct interface with mV-level sensor outputs |
| Quiescent Current | 250µA in active mode; 2µA in power-down-critical for battery-powered instrumentation |
| Line Rejection | 150dB NMR at 50Hz/60Hz with built-in digital filter notch-eliminates need for external analog notch filters |
| Reference Input | Full-scale ±1.25V differential reference (REFIN+ to REFIN−)-supports ratiometric or absolute measurements |
Pinout & Package
MAX1401EAI+T is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, suitable for automated PCB assembly and compact industrial modules.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN6 | Differential/pseudo-differential analog inputs | Support configurable channel mapping: AIN1/AIN2, AIN3/AIN4, AIN5/AIN6 as differential pairs; AIN6 serves as common for pseudo-diff mode |
| CALOFF±, CALGAIN± | Calibration auxiliary inputs | Enable system-level offset/gain error correction; double as extra differential channels when calibration unused |
| MUXOUT±, ADCIN± | Internal mux output / direct ADC input | MUXOUT± allows external amplification pre-ADC; ADCIN± bypasses mux for direct signal injection |
| SCLK, DIN, DOUT, CS, INT | SPI/QSPI-compatible serial interface | 3-wire interface with interrupt-driven readout; CS enables multi-device bus sharing or frame sync |
| CLKIN/CLKOUT | Master clock interface | Accepts 1.024MHz or 2.4576MHz external clock; supports crystal oscillator connection between CLKIN–CLKOUT |
| V+, VDD, AGND, DGND | Analog/digital power and ground | Separate analog/digital supplies and grounds minimize noise coupling in precision measurement |
Key Features
| Feature | Design Value |
|---|---|
| Programmable decimation filter | Enables trade-off between resolution (up to 18-bit) and data rate (480sps max at 16-bit), with selectable 50/60Hz notch placement |
| Offset DAC with ±117% FSR compensation | Corrects system-level DC offsets (e.g., sensor bias, amplifier drift) without external circuitry |
| Low-noise analog front-end | 0.5 µVRMS output noise and 16-bit noise-free resolution ensure stable digitization of µV-level signals |
| Flexible input configuration | Three differential channels reconfigurable as five pseudo-differential inputs-maximizes channel count in space-limited designs |
| Integrated burn-out detection | Transducer open-wire detection via programmable current sources-reduces BOM count in pressure/strain systems |
Applications
| Portable Weigh Scales | Loop-Powered Pressure Transducers |
|---|---|
Use Scenario: Battery-operated handheld scale measuring load cells with mV/V output under variable temperature. IC Role / Device Role / Timing Role: Primary sigma-delta ADC performing high-precision DC measurement with auto-calibration and line-frequency rejection. Use Value: 16-bit accuracy at 480sps and 250µA quiescent current extend battery life while maintaining repeatability within ±0.001% FSR. | Use Scenario: 4–20mA loop-powered industrial pressure sensor with integrated signal conditioning. IC Role / Device Role / Timing Role: Multichannel ADC digitizing bridge output and temperature compensation signal in a single chip. Use Value: Dual calibration channels (CALOFF±, CALGAIN±) enable factory-trimmed offset/gain correction, reducing calibration labor by >40%. |
| Portable Industrial Data Loggers | High-Accuracy Temperature Monitoring Systems |
Use Scenario: Field-deployable logger acquiring thermocouple, RTD, and voltage signals over extended periods. IC Role / Device Role / Timing Role: Central oversampling ADC with programmable gain and automatic channel scanning across five pseudo-differential inputs. Use Value: Configurable 1–128× gain and 50/60Hz notch filtering eliminate external amplifiers and analog filters-cutting board area by 35%. | Use Scenario: Medical-grade temperature monitor using platinum RTD with cold-junction compensation. IC Role / Device Role / Timing Role: Precision ADC capturing low-drift, low-noise RTD voltage with integrated offset compensation and reference buffering. Use Value: ±0.3 µV/°C bipolar zero drift and 150dB CMR ensure <0.01°C measurement stability over –40°C to +85°C operating range. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IRTCR | 24-bit resolution, 125kSPS max, fixed 1× gain, no on-chip calibration channels | Better resolution/speed but lacks programmable gain and system calibration support | Prefer for high-speed, single-channel metrology; avoid when multi-sensor offset correction is required |
| AD7798BRUZ | 16-bit resolution, 480sps max, 3 differential inputs, 2.7–5.25V supply, no MUXOUT access | Lower power (110µA) but missing MUXOUT± pins and 50/60Hz notch programming | Prefer for ultra-low-power, single-supply systems without external signal conditioning needs |
Compared with ADS1258IRTCR and AD7798BRUZ, the MAX1401EAI+T uniquely combines 18-bit resolution, programmable gain (1×–128×), dual calibration channels, and MUXOUT± accessibility-making it the only option among the three that supports both high-accuracy sensor interfacing and in-system calibration without external components.
Availability
MAX1401EAI+T is available at Aetrix Electronics and suitable for portable industrial instruments, loop-powered systems, and high-accuracy temperature monitoring requiring stable component supply across extended temperature ranges (–40°C to +85°C).
Supply support for MAX1401EAI+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 industrial, medical, and communications applications.
The MAX1401 product line targets low-power, high-resolution data acquisition in space- and energy-constrained instrumentation-emphasizing integrated calibration, line-rejection, and flexible input architecture for sensor front-ends.
FAQ
What is the maximum output data rate with guaranteed 16-bit accuracy for the MAX1401EAI+T?
The MAX1401EAI+T 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 with a 2.4576MHz master clock, FS1 = 0, and MF1/MF0 settings enabling the normal mode decimation filter. Higher data rates reduce effective resolution below 16 bits.
Does the MAX1401EAI+T support both differential and pseudo-differential input configurations?
Yes, the MAX1401EAI+T supports three fully differential input channels (AIN1/AIN2, AIN3/AIN4, AIN5/AIN6) that can be reconfigured as five pseudo-differential channels using AIN6 as a shared common node. This flexibility is controlled via on-chip registers and enables efficient use of limited PCB real estate in multi-sensor systems.
How does the MAX1401EAI+T achieve 50Hz and 60Hz line-frequency rejection?
The MAX1401EAI+T uses its programmable digital decimation filter to place notches precisely at 50Hz or 60Hz and their harmonics when operated with a 2.4576MHz or 1.024MHz master clock. This is achieved through internal filter coefficient selection (MF1/MF0 bits), delivering 150dB normal-mode rejection without external analog filtering components.
What is the purpose of the MUXOUT± and ADCIN± pins on the MAX1401EAI+T?
MUXOUT± provides access to the internal multiplexer's differential output before the ADC stage, allowing external amplification or filtering. ADCIN± accepts externally conditioned signals directly into the ADC core, bypassing the mux. Together, they enable advanced signal conditioning architectures-such as remote gain/offset adjustment-without adding discrete op-amps or layout complexity.
Can the MAX1401EAI+T perform system-level offset and gain calibration?
Yes, the MAX1401EAI+T includes dedicated CALOFF± and CALGAIN± pins for full-system calibration. These inputs accept external zero-reference and full-scale reference voltages, enabling software-controlled correction of sensor and front-end amplifier errors. When unused in auto-sequence mode, they function as additional differential input channels.
MAX1401EAI+T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 28-SSOP (0.209", 5.30mm Width)
- Packaging:
- Tape & Reel (TR)
- 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+T FAQ
1.How can I place an order for MAX1401EAI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1401EAI+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 MAX1401EAI+T reliable?
The price and inventory of MAX1401EAI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1401EAI+T is usually 5 days.
3.What payment methods are accepted for MAX1401EAI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1401EAI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1401EAI+T?
MAX1401EAI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1401EAI+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 MAX1401EAI+T?
For technical support, including MAX1401EAI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1401EAI+T requirements.
6.How does Aetrix verify that MAX1401EAI+T is sourced from the original manufacturer or authorized distributors?
All MAX1401EAI+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 MAX1401EAI+T meets industry standards.
7.What is the process for return or replacement of MAX1401EAI+T?
All MAX1401EAI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1401EAI+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 MAX1401EAI+T part is unused and in its original packaging.
Return procedure for MAX1401EAI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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