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Analog Devices Inc./Maxim Integrated MAX1400EAI+
- Part No.:
- MAX1400EAI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1400EAI+.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,068
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Product details
Overview
MAX1400EAI+ from Maxim Integrated is an 18-bit, low-power, multichannel sigma-delta ADC with three fully differential input channels (configurable as five pseudo-differential), programmable gain (1×–128×), on-chip digital decimation filter, and SPI/QSPI-compatible 3-wire serial interface. It operates from a +5V analog supply and +3V/+5V digital supply, achieving true 16-bit performance at up to 480 samples per second (sps) with no missing codes.
For engineers reviewing the MAX1400EAI+ datasheet, MAX1400EAI+ pinout, MAX1400EAI+ application, or MAX1400EAI+ equivalent, key selection considerations include its -40°C to +85°C industrial temperature range, integrated offset/gain calibration channels, 28-pin SSOP package, line-frequency rejection capability (50Hz/60Hz notch filtering), and ultra-low 250µA operating current - critical for portable instrumentation and loop-powered systems.
Technical Context
The MAX1400EAI+ employs a chopper-stabilized PGA followed by a sigma-delta modulator and a programmable digital decimation filter with user-selectable notch frequencies (50Hz or 60Hz). Its switching network supports independent channel configuration, and internal DACs compensate input-referred DC offset up to 117% of full-scale range.
It features dual calibration channels (CALGAIN±, CALOFF±) usable as auxiliary differential inputs when calibration is disabled, plus direct access to the multiplexer output (MUXOUT±) for external signal conditioning. The device supports both continuous conversion and command-triggered operation, with automatic channel scanning and interrupt-driven data ready signaling via the INT pin.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit sigma-delta architecture; delivers true 16-bit accuracy with no missing codes at ≤480 sps. |
| Input Channels | 3 fully differential or 5 pseudo-differential signal inputs; plus 2 dedicated calibration channels (CALGAIN±, CALOFF±). |
| Programmable Gain | 1× to 128× in discrete steps; enables high-precision measurement of mV-level sensor outputs without external amplification. |
| Power Consumption | 250 µA quiescent current (operating mode); 2 µA in power-down mode - suitable for battery-powered instruments. |
| Line Rejection | 150 dB normal-mode rejection at 50Hz/60Hz via programmable digital filter notch - eliminates need for external line-frequency filtering. |
| Reference Inputs | Fully differential REFIN±; accepts 2.50V reference voltage with ±5% tolerance for specified performance. |
| Operating Temperature | -40°C to +85°C (E-grade); qualified for industrial environments including pressure transducers and portable weigh scales. |
Pinout & Package
MAX1400EAI+ is housed in a 28-pin SSOP (Shrink Small Outline Package) with 0.635mm pitch, optimized for compact industrial PCB layouts and thermal stability across extended temperature ranges.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLKIN | Master clock input | Accepts 0.8–5.0 MHz CMOS clock or crystal (2.4576 MHz / 1.024 MHz standard); enables precise timing control of sigma-delta sampling. |
| 3 CS | Chip-select input | Active-low enable for 3-wire SPI/QSPI interface; allows multi-device bus sharing or frame synchronization in continuous-clock mode. |
| 5 MUXOUT+ | Positive multiplexer output | Provides buffered, unfiltered analog signal pre-ADC for external amplification or filtering before re-injection via ADCIN±. |
| 11–16 AIN1–AIN6 | Signal input terminals | Support flexible configuration: AIN1/AIN2, AIN3/AIN4, AIN5/AIN6 as differential pairs; AIN6 serves as common for pseudo-differential mode (AIN1–AIN5). |
| 17–22 CALGAIN±, CALOFF± | Calibration channel inputs | Dedicated fully differential inputs for system-level gain/offset error measurement; double as auxiliary signal inputs when calibration is disabled. |
| 25 INT | Interrupt output | Active-low flag indicating new conversion result ready in data register; synchronizes host MCU reads without polling overhead. |
Key Features
| Feature | Design Value |
|---|---|
| On-chip digital decimation filter | Programmable notch at 50Hz/60Hz with ±0.02×fNOTCH bandwidth - achieves 150dB line rejection without external hardware. |
| Offset compensation DAC | Adjusts input-referred DC offset up to 117% of selected full-scale range - corrects sensor/system offsets without external circuitry. |
| Flexible input architecture | Three differential channels configurable as five pseudo-differential inputs, plus two calibration channels usable as signal inputs - maximizes channel count in space-constrained designs. |
| Low-noise chopper-stabilized buffers | Isolates high-impedance sensors from PGA/modulator capacitance - preserves signal integrity for precision weigh-scale and transducer applications. |
| Multi-supply operation | +5V analog supply (V+) and +3V/+5V digital supply (VDD) - simplifies power design in mixed-voltage systems and reduces digital noise coupling. |
Applications
| Portable Weigh Scales | Pressure Transducers |
|---|---|
Use Scenario: Battery-powered handheld or platform scales measuring load cells with mV/V output. IC Role / Device Role / Timing Role: Primary sigma-delta ADC performing high-resolution, low-drift digitization of bridge sensor outputs with on-the-fly offset/gain correction. Use Value: 16-bit no-missing-codes performance at 480 sps and 250 µA operating current extend battery life while maintaining 0.0015% FSR INL for sub-gram resolution. |
Use Scenario: Industrial pressure sensing modules converting piezoresistive or capacitive sensor outputs in harsh environments. IC Role / Device Role / Timing Role: Precision front-end ADC with integrated 50Hz/60Hz line rejection and calibration channels for factory-trimmed sensor compensation. Use Value: 150 dB line rejection and ±0.3 µV/°C bipolar zero drift ensure stable readings in electrically noisy plants without external notch filters or recalibration. |
| Loop-Powered Systems | Portable Industrial Instruments |
Use Scenario: 4–20 mA loop-powered field transmitters with limited power budget (<4 mA total). IC Role / Device Role / Timing Role: Low-power ADC core enabling sensor digitization within strict loop-current constraints using dynamic power scaling modes. Use Value: 2 µA power-down current and 250 µA active current allow full functionality while leaving >3.7 mA for sensor excitation and output driver circuits. |
Use Scenario: Handheld multimeters, data loggers, and calibration tools requiring wide dynamic range and portability. IC Role / Device Role / Timing Role: Multichannel sigma-delta converter supporting simultaneous acquisition from multiple sensors (e.g., temperature, strain, humidity) via auto-scanning mode. Use Value: Automatic channel sequencing with minimal host interface overhead and SPI-compatible 3-wire interface reduce MCU firmware complexity and BOM count. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IPWR | 24-bit resolution, 125 kSPS max, 32-pin TSSOP; requires external reference and higher supply current (3.2 mA). | Better resolution/speed but higher power and larger footprint - suited for benchtop, not portable instruments. | Select when >16-bit resolution and faster throughput outweigh size/power constraints. |
| AD7798BRUZ | 16-bit, 4.17 Hz–470 Hz output rate, 16-pin TSSOP; integrated 2.5V reference, lower IDD (125 µA), no MUXOUT access. | Limited channel flexibility and no multiplexer output tap - simpler integration but no external signal conditioning path. | Choose for cost-sensitive, low-channel-count applications where MUXOUT and calibration channels are unnecessary. |
Compared with ADS1258IPWR and AD7798BRUZ, the MAX1400EAI+ uniquely balances 16-bit guaranteed performance, ultra-low 250 µA operating current, 28-pin SSOP compactness, and MUXOUT± accessibility - making it optimal for portable, battery- or loop-powered industrial sensors requiring embedded signal conditioning and line-noise immunity.
Availability
MAX1400EAI+ is available at Aetrix Electronics and suitable for portable industrial instruments, pressure transducers, and loop-powered systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1400EAI+ 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) is a semiconductor company specializing in high-performance analog, mixed-signal, and power management ICs for industrial, automotive, and communications markets.
The MAX1400EAI+ belongs to Maxim's precision sigma-delta ADC product line, designed specifically for low-power, high-accuracy sensor digitization in portable and loop-powered instrumentation where resolution, noise immunity, and thermal stability are critical.
FAQ
What is the operating temperature range of the MAX1400EAI+?
The MAX1400EAI+ is rated for operation from -40°C to +85°C, meeting industrial-grade environmental requirements. This E-grade specification ensures reliable performance in demanding applications such as pressure transducers deployed in outdoor or factory-floor environments, where ambient temperatures fluctuate widely. The device maintains specified INL, offset drift, and line-rejection performance across this full range.
Does the MAX1400EAI+ support 50Hz and 60Hz line-frequency rejection?
Yes, the MAX1400EAI+ supports programmable digital notch filtering at both 50Hz and 60Hz via its on-chip decimation filter. When configured with fCLKIN = 2.4576MHz and appropriate filter control bits (MF1/MF0), it achieves 150dB normal-mode rejection at 50Hz and 100dB at 60Hz - eliminating the need for external analog notch filters in AC-powered industrial equipment.
How many analog input channels does the MAX1400EAI+ provide?
The MAX1400EAI+ provides three fully differential input channels (AIN1/AIN2, AIN3/AIN4, AIN5/AIN6), configurable as five pseudo-differential channels using AIN6 as a common reference. Additionally, the CALGAIN± and CALOFF± pins serve as two extra fully differential inputs when system calibration is disabled - delivering up to seven usable analog input paths in auto-sequence mode.
What is the purpose of the MUXOUT± pins on the MAX1400EAI+?
The MUXOUT± pins on the MAX1400EAI+ provide buffered, unfiltered analog signals directly from the internal input multiplexer output. They enable external signal conditioning - such as amplification, filtering, or isolation - before the signal enters the PGA and sigma-delta modulator. This capability allows designers to implement custom front-end processing without adding external multiplexers or op-amp stages.
Can the MAX1400EAI+ operate from a 3.3V digital supply?
Yes, the MAX1400EAI+ supports a digital supply voltage (VDD) ranging from +2.7V to +5.25V, including standard 3.3V logic levels. Its SPI/QSPI-compatible 3-wire interface operates correctly with VDD = 3.3V, and all digital input thresholds (VIH/VIL) and output drive specifications (VOH/VOL) are guaranteed across this range - facilitating seamless integration into mixed-voltage systems with 3.3V microcontrollers.
MAX1400EAI+ 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:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- -40°C ~ 85°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1400EAI+ FAQ
1.How can I place an order for MAX1400EAI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1400EAI+ 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 MAX1400EAI+ reliable?
The price and inventory of MAX1400EAI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1400EAI+ is usually 5 days.
3.What payment methods are accepted for MAX1400EAI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1400EAI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1400EAI+?
MAX1400EAI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1400EAI+ 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 MAX1400EAI+?
For technical support, including MAX1400EAI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1400EAI+ requirements.
6.How does Aetrix verify that MAX1400EAI+ is sourced from the original manufacturer or authorized distributors?
All MAX1400EAI+ 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 MAX1400EAI+ meets industry standards.
7.What is the process for return or replacement of MAX1400EAI+?
All MAX1400EAI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1400EAI+, 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 MAX1400EAI+ part is unused and in its original packaging.
Return procedure for MAX1400EAI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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