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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:2,032
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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, multichannel precision measurement in portable industrial instruments and loop-powered systems. It delivers true 16-bit accuracy at up to 480 samples per second (sps), features three fully differential input channels (programmable gain 1–128 V/V), supports 50/60Hz line-frequency rejection via digital filter notch configuration, and operates from a single +3V supply.
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 (continuous/command-triggered conversion), real-world noise-free resolution (16 bits), and precise power consumption data (250µA active, 2µA power-down) - all critical for battery-powered sensor interface design and high-accuracy weigh-scale signal chains.
Technical Context
The MAX1401CAI+ employs a sigma-delta modulator with a programmable digital decimation filter that enables trade-offs between resolution and output data rate - e.g., full 18-bit oversampling resolution at lower rates or 16-bit accuracy at 480sps. Its modulator sampling frequency is configurable for lowest power (250µA) or highest throughput, and internal clocking supports 2.4576MHz or 1.024MHz master clocks.
Three differential analog input channels can be reconfigured as five pseudo-differential inputs using AIN6 as common; two additional calibration channels (CALOFF±, CALGAIN±) support system-level offset/gain error correction. The device provides direct access to the multiplexer output (MUXOUT±) and ADC input terminals (ADCIN±), enabling external signal conditioning before digitization.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit oversampling sigma-delta architecture; guarantees no missing codes at 16-bit level |
| Accuracy | True 16-bit accuracy at up to 480sps output data rate |
| Input Channels | 3 fully differential or 5 pseudo-differential signal inputs; plus 2 dedicated calibration channels |
| Gain Range | Programmable gain of +1V/V to +128V/V per channel |
| Power Consumption | 250µA quiescent current in operating mode; 2µA in power-down mode |
| Supply Voltage | +2.7V to +3.6V analog (V+) and digital (VDD) supplies - single +3V operation supported |
| Line Rejection | Digital filter programmable for 50Hz/60Hz notch rejection without external post-filtering |
Pinout & Package
MAX1401CAI+ is housed in a 28-pin SSOP (Shrink Small Outline Package) with exposed pad, rated for 0°C to +70°C operating temperature range.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| AIN1–AIN5 | Analog input terminals | Support differential or pseudo-differential configurations; AIN6 serves as common reference for pseudo-differential mode |
| AIN6 | Common analog input / differential pair negative | Enables 5-channel pseudo-differential operation or forms AIN5/AIN6 differential pair |
| CALOFF±, CALGAIN± | Calibration channel inputs | Provide dedicated fully differential paths for system offset and gain error correction |
| MUXOUT± | Multiplexer output terminals | Expose pre-ADC analog signal for external amplification/conditioning before feeding back to ADCIN± |
| ADCIN± | Direct ADC input terminals | Bypass internal mux; accept conditioned signals from MUXOUT± or external sources |
| REFIN± | Differential reference inputs | Accept external reference voltage (e.g., +1.25V) to set full-scale range and improve ratiometric accuracy |
| SCLK, DIN, DOUT, CS | Serial interface signals | 3-wire SPI™/QSPI™-compatible interface for register access and data readout |
| INT | Interrupt output | Active-low flag indicating new conversion result ready in data register |
| CLKIN/CLKOUT | Master clock interface | Support crystal (2.4576MHz/1.024MHz) or external CMOS clock; X2CLK bit enables doubled frequencies |
Key Features
| Feature | Design Value |
|---|---|
| Programmable decimation filter | Enables user-selectable trade-off between resolution (up to 18-bit) and output data rate (max 480sps) |
| On-chip offset DAC | Compensates input-referred DC offset up to ±117% of selected full-scale range |
| Flexible input configuration | 3 differential or 5 pseudo-differential channels + 2 calibration channels - all independently programmable |
| Low-noise analog front-end | 16-bit noise-free resolution; >150dB common-mode rejection (CMR); >100dB normal-mode rejection (NMR) at 50/60Hz |
| Buffered/unbuffered operation | Selectable input buffering affects input leakage (<10nA buffered, <40pA unbuffered) and dynamic range |
Applications
| Portable Weigh Scales | Loop-Powered Transmitter Systems |
|---|---|
Use Scenario: High-precision load cell signal acquisition in handheld or benchtop weighing instruments with battery operation. IC Role / Device Role / Timing Role: Primary sigma-delta ADC performing low-noise, low-drift digitization of millivolt-level bridge outputs with on-chip gain and offset calibration. Use Value: 16-bit accuracy at 480sps enables sub-gram resolution; 250µA operating current extends battery life; 50/60Hz rejection eliminates mains interference without external filters. |
Use Scenario: Analog sensor signal conditioning and digitization in 4–20mA loop-powered field transmitters for pressure, temperature, or flow sensing. IC Role / Device Role / Timing Role: Precision ADC core interfacing directly to sensor front-end, providing calibrated digital output for HART or microcontroller communication. Use Value: Single +3V operation simplifies power design within tight loop budget; programmable gain (1–128) accommodates diverse sensor sensitivities; calibration channels enable factory trim compensation. |
| Portable Industrial Data Loggers | Pressure Transducer Signal Conditioning |
Use Scenario: Multi-sensor monitoring in battery-operated field instruments requiring long-term stability and low self-heating. IC Role / Device Role / Timing Role: Multichannel ADC scanning up to five inputs sequentially with automatic channel sequencing and continuous serial output. Use Value: 2µA power-down mode minimizes standby drain; temperature drift specs (e.g., 0.3µV/°C bipolar zero drift) ensure stable readings across environmental ranges. |
Use Scenario: High-accuracy digitization of piezoresistive or capacitive pressure sensor outputs in medical or process control equipment. IC Role / Device Role / Timing Role: Precision analog front-end with differential inputs, programmable gain, and system-level offset correction for ratiometric sensor interfaces. Use Value: Fully differential REFIN± inputs preserve common-mode immunity; CALOFF±/CALGAIN± channels allow end-of-line calibration to correct sensor nonlinearity and amplifier errors. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar precision sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IRHBT | 24-bit resolution, higher power (3.2mA), fixed 32kSPS max, no built-in 50/60Hz notch | Better resolution but unsuitable for ultra-low-power portable use; requires external filtering for line rejection | Choose when absolute resolution >16-bit is required and power budget allows >10× higher current draw |
| AD7798BRUZ | 16-bit sigma-delta, 470µA typical current, 4-channel differential, no MUXOUT access or calibration channels | Lacks direct mux output access and dedicated calibration inputs; simpler feature set for cost-sensitive designs | Choose for basic multichannel measurement where system-level calibration is handled externally |
Compared with ADS1258IRHBT and AD7798BRUZ, MAX1401CAI+ uniquely balances ultra-low power (250µA), integrated 50/60Hz rejection, on-chip calibration resources, and flexible input routing - making it optimal for portable, battery-constrained, high-accuracy sensor systems requiring minimal external components.
Availability
MAX1401CAI+ is available at Aetrix Electronics and suitable for portable industrial instruments, loop-powered transmitter systems, and pressure transducer signal conditioning requiring stable component supply and long-term production continuity.
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 high-performance analog, mixed-signal, and power management ICs for demanding industrial, automotive, and communications applications.
The MAX1401CAI+ belongs to Maxim's precision data acquisition product line, engineered specifically for low-power, multichannel, high-resolution measurement in portable and loop-powered instrumentation where accuracy, noise immunity, and supply efficiency are critical.
FAQ
What is the maximum output data rate with guaranteed 16-bit accuracy for MAX1401CAI+?
The MAX1401CAI+ achieves true 16-bit accuracy at an output data rate of up to 480 samples per second (sps). This specification is confirmed in the Electrical Characteristics table under "16-Bit Accuracy with No Missing Codes" and applies with FS1 = 0 and appropriate filter settings. Higher data rates reduce effective resolution due to decimation filter constraints.
Does MAX1401CAI+ support 50Hz and 60Hz line-frequency rejection without external hardware?
Yes, MAX1401CAI+ supports built-in 50Hz and 60Hz line-frequency rejection through its programmable digital decimation filter. When configured with a 2.4576MHz or 1.024MHz master clock and appropriate MF1/MF0 bits, the filter places notches at line frequency and harmonics - delivering >100dB normal-mode rejection without requiring external analog filters or DSP post-processing.
How many analog input channels does MAX1401CAI+ support, and how are they configured?
MAX1401CAI+ supports three fully differential input channels (AIN1–AIN2, AIN3–AIN4, AIN5–AIN6), configurable as five pseudo-differential channels using AIN6 as common. Additionally, CALOFF± and CALGAIN± provide two dedicated fully differential calibration channels - totaling seven usable analog input paths, all accessible via on-chip registers and independent gain/offset programming.
What is the power consumption of MAX1401CAI+ in active and power-down modes?
MAX1401CAI+ draws 250µA typical quiescent current in active operating mode and only 2µA in power-down mode (with PD bit = 1 and external clock stopped). These values are measured at V+ = VDD = +3.3V and are specified across the full 0°C to +70°C temperature range - enabling multi-year battery life in portable instrumentation.
Can MAX1401CAI+ perform system-level offset and gain calibration?
Yes, MAX1401CAI+ includes dedicated CALOFF± and CALGAIN± terminals for system-level calibration. These fully differential inputs allow users to inject known zero- and full-scale references to measure and correct system offset and gain errors in software or firmware - eliminating the need for external calibration DACs or manual trimming in final assembly.
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:
- 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:
- 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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