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Analog Devices Inc./Maxim Integrated MAX1401CAI
- Part No.:
- MAX1401CAI
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1401CAI.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,097
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Product details
Overview
MAX1401CAI 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, supports three fully differential or five pseudo-differential input channels with programmable gain (1×–128×), and operates from a single +3V supply across 0°C to +70°C. It is used in portable weigh scales and loop-powered pressure transducers requiring high line-rejection without external filtering.
For engineers reviewing the MAX1401CAI datasheet, MAX1401CAI pinout, MAX1401CAI application, or MAX1401CAI equivalent, this page provides verified technical context, validated pin functions, confirmed operating modes (e.g., 480sps/16-bit mode, 50Hz/60Hz notch filter), real-world supply current values (250µA active, 2µA power-down), and two rigorously cross-checked alternative ADCs for multichannel precision measurement.
Technical Context
The MAX1401CAI implements a sigma-delta modulator with on-chip digital decimation filtering, enabling user-selectable decimation factors to trade resolution for data rate-achieving 16-bit no-missing-codes performance at 480sps. Its modulator sampling frequency is configurable for lowest power (250µA) or highest throughput (480sps), and it supports both continuous and command-triggered conversion.
It integrates a flexible analog front-end: three differential input channels (reconfigurable as five pseudo-differential), two dedicated calibration channels (CALOFF±, CALGAIN±), full-scale offset compensation up to ±117% of selected range, and direct access to mux output (MUXOUT±) and ADC input (ADCIN±) for external signal conditioning. Reference inputs are fully differential and support 1.25V nominal reference voltage.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit sigma-delta architecture with 16-bit guaranteed no-missing-codes accuracy at 480sps |
| Input Channels | 3 fully differential or 5 pseudo-differential signal inputs plus 2 dedicated calibration channels |
| Programmable Gain | 1× to 128× in discrete steps; enables wide dynamic range for mV-level sensor outputs |
| Supply Voltage | +2.7V to +3.6V analog (V+) and digital (VDD) supplies; single +3V operation supported |
| Quiescent Current | 250µA in active mode; 2µA in power-down mode-critical for battery-powered instruments |
| Line Rejection | 150dB at 50Hz/60Hz via programmable digital filter notch-eliminates need for external analog notch filters |
| Reference Input | Differential REFIN± accepts 1.25V nominal; supports unbuffered or buffered (BUFF=1) configurations |
Pinout & Package
MAX1401CAI is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.65mm lead pitch, rated for 0°C to +70°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN6 | Analog input terminals | Support 3 differential pairs (AIN1/AIN2, AIN3/AIN4, AIN5/AIN6) or 5 pseudo-differential inputs sharing AIN6 as common |
| CALOFF±, CALGAIN± | Calibration channel inputs | Enable system-level offset/gain error correction; double as auxiliary differential inputs when unused |
| MUXOUT±, ADCIN± | Internal multiplexer and ADC core interface | Provide direct access to pre-ADC signal path for external amplification or filtering before digitization |
| REFIN± | Differential reference input | Accepts 1.25V nominal reference; common-mode range extends from AGND to V+ (±30mV tolerance) |
| SCLK/DIN/DOUT/CS/INT | SPI/QSPI-compatible serial interface | 3-wire interface with interrupt-driven data ready signaling; supports frame-sync (CS) or continuous clock modes |
Key Features
| Feature | Design Value |
|---|---|
| Programmable decimation filter | Enables selectable output data rates (20–480sps) and 50Hz/60Hz notch placement without hardware changes |
| Offset DAC with ±117% FSR range | Compensates system-level DC offsets (e.g., sensor bias, PCB leakage) before digitization |
| Low-noise analog front-end | Input referred noise ≤0.5µVRMS; INL ±0.001%FSR; CMR ≥150dB ensures integrity in noisy industrial environments |
| Flexible power management | 2µA standby current with external clock stopped; supports rapid wake-up for event-triggered acquisition |
| Direct MUX and ADC access | MUXOUT± and ADCIN± pins allow insertion of external instrumentation amplifiers or anti-aliasing filters |
Applications
| Portable Weigh Scales | Loop-Powered Pressure Transducers |
|---|---|
Use Scenario: Battery-operated handheld scale measuring load cells with mV-level output and ambient temperature variation. IC Role / Device Role / Timing Role: Precision ADC acquiring differential bridge signals at 60–240sps with integrated offset/gain calibration and 50Hz line rejection. Use Value: 250µA active current extends battery life; programmable gain (1–128×) accommodates multiple load cell sensitivities; on-chip offset DAC eliminates manual zero-adjust potentiometers. |
Use Scenario: 4–20mA loop-powered smart pressure transmitter in hazardous industrial zones with strict power budget (<4mA). IC Role / Device Role / Timing Role: Low-power sigma-delta ADC digitizing conditioned pressure sensor output while maintaining loop compliance. Use Value: 2µA power-down mode minimizes quiescent draw; 16-bit accuracy at 480sps meets HART protocol timing; differential inputs reject common-mode noise from long sensor cables. |
| Portable Industrial Data Loggers | Multi-Sensor Environmental Monitoring |
Use Scenario: Field-deployable logger recording temperature, humidity, and strain with >16-bit fidelity over 0°C–70°C range. IC Role / Device Role / Timing Role: Multichannel ADC scanning up to five pseudo-differential sensors sequentially with automatic channel sequencing. Use Value: Single-chip solution reduces BOM count; internal calibration channels enable in-field sensor drift correction; SPI interface simplifies microcontroller integration. |
Use Scenario: Compact environmental node measuring thermocouples, RTDs, and gas sensors with varying output ranges and noise profiles. IC Role / Device Role / Timing Role: High-PSR (≥85dB) ADC rejecting supply ripple and EMI in shared PCB layouts with RF modules and switching regulators. Use Value: 85dB PSR at gain ≥8× prevents supply noise from corrupting µV-level thermocouple readings; 28-pin SSOP footprint enables dense sensor fusion designs. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel precision ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IDBT | 24-bit delta-sigma ADC; 12-channel scan; fixed 30ksps max rate; requires external reference; higher power (3.2mA active) | Better resolution for lab-grade instruments; less suitable for battery operation due to current draw | Select when absolute 24-bit resolution and 12-channel count outweigh power constraints |
| AD7798BRUZ | 16-bit sigma-delta ADC; 8-channel scan; 480sps max; 1.15mA active current; no programmable notch filter | Lacks 50/60Hz digital notch; simpler register map but requires external line-rejection filtering | Select for cost-sensitive, lower-complexity designs where external RC filtering is acceptable |
Compared with ADS1258IDBT and AD7798BRUZ, the MAX1401CAI uniquely balances 16-bit no-missing-codes accuracy at 480sps, ultra-low 250µA active current, and integrated 50/60Hz notch filtering-making it optimal for portable, loop-powered, and battery-constrained precision measurement systems where power, size, and line immunity are co-constrained.
Availability
MAX1401CAI is available at Aetrix Electronics and suitable for portable industrial instruments, loop-powered systems, and pressure transducer designs requiring stable component supply across commercial temperature range (0°C to +70°C).
Supply support for MAX1401CAI 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 MAX1401CAI belongs to Maxim's high-accuracy, low-power sigma-delta ADC product line, engineered specifically for battery-operated and loop-powered instrumentation requiring 16-bit integrity without external line-rejection circuitry.
FAQ
What is the maximum output data rate with guaranteed 16-bit no-missing-codes performance for the MAX1401CAI?
The MAX1401CAI achieves true 16-bit accuracy with no missing codes at up to 480 samples per second. This is confirmed in the Electrical Characteristics table under "16-Bit Accuracy with No Missing Codes to 480sps" and validated across the full 0°C to +70°C temperature range specified for the MAX1401CAI ordering option. Higher data rates reduce effective resolution below 16 bits.
Does the MAX1401CAI support 50Hz and 60Hz line-frequency rejection without external components?
Yes, the MAX1401CAI includes a programmable digital decimation filter that can place notches at 50Hz and 60Hz (and their harmonics) when configured with a 2.4576MHz or 1.024MHz master clock. The datasheet specifies 150dB rejection at both frequencies-guaranteed by design-eliminating the need for external analog notch filters in the MAX1401CAI signal chain.
How many analog input channels does the MAX1401CAI support, and how are they configured?
The MAX1401CAI supports three fully differential input channels (AIN1/AIN2, AIN3/AIN4, AIN5/AIN6), which can be reconfigured as five pseudo-differential channels using AIN6 as a shared common. Additionally, CALOFF± and CALGAIN± serve as two auxiliary fully differential calibration channels, usable as signal inputs when calibration is disabled-yielding up to seven total analog input paths in flexible configurations.
What is the power consumption of the MAX1401CAI in active and power-down modes?
The MAX1401CAI draws 250µA typical quiescent current in active operation (V+ = VDD = +3.3V, fCLKIN = 2.4576MHz) and only 2µA in power-down mode with the external clock stopped. These values are explicitly listed in the "Features" section and confirmed in the Electrical Characteristics tables for the MAX1401CAI temperature grade, making it suitable for energy-constrained portable instrumentation.
Can the MAX1401CAI perform system-level offset and gain calibration, and how is it implemented?
Yes, the MAX1401CAI integrates dedicated calibration channels: CALOFF± for offset correction and CALGAIN± for gain correction. Its on-chip offset DAC compensates input-referred DC offset up to ±117% of the selected full-scale range. Calibration is performed digitally via register writes-no external components required-and the same pins double as auxiliary differential inputs when calibration is inactive.
MAX1401CAI 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:
- Obsolete
- 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:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1401CAI FAQ
1.How can I place an order for MAX1401CAI through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1401CAI 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 MAX1401CAI reliable?
The price and inventory of MAX1401CAI are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1401CAI is usually 5 days.
3.What payment methods are accepted for MAX1401CAI?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1401CAI transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1401CAI?
MAX1401CAI orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1401CAI 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 MAX1401CAI?
For technical support, including MAX1401CAI datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1401CAI requirements.
6.How does Aetrix verify that MAX1401CAI is sourced from the original manufacturer or authorized distributors?
All MAX1401CAI 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 MAX1401CAI meets industry standards.
7.What is the process for return or replacement of MAX1401CAI?
All MAX1401CAI units undergo pre-shipment inspection (PSI). If there is an issue with MAX1401CAI, 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 MAX1401CAI part is unused and in its original packaging.
Return procedure for MAX1401CAI:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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