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Analog Devices Inc./Maxim Integrated MAX1402EAI+
- Part No.:
- MAX1402EAI+
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1402EAI+.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:3,528
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Product details
Overview
The MAX1402EAI+ from Maxim Integrated is a low-power, 18-bit sigma-delta analog-to-digital converter (ADC) with three fully differential or five pseudo-differential input channels, matched 200µA on-chip current sources for sensor excitation, and 16-bit accuracy at up to 480sps output data rate. It operates from a +5V analog supply and +3V/+5V digital supply, targeting precision measurement in loop-powered industrial sensors and portable weighing systems.
For engineers reviewing the MAX1402EAI+ datasheet, MAX1402EAI+ pinout, MAX1402EAI+ application, or MAX1402EAI+ equivalent, key selection criteria include its programmable decimation filter for line-frequency rejection (50Hz/60Hz), ±40°C to +85°C industrial temperature range, 28-pin SSOP package, and SPI/QSPI-compatible 3-wire serial interface with interrupt-driven data ready signaling.
Technical Context
The MAX1402EAI+ employs a sigma-delta modulator with digital decimation filtering, supporting user-selectable decimation factors to trade resolution for throughput-achieving true 16-bit performance at 480sps and higher rates at reduced resolution. Its modulator sampling frequency is configurable via external clock (1.024MHz or 2.4576MHz) or crystal, enabling notch placement at line frequency and harmonics without external post-filtering.
It integrates two fully differential calibration channels (CALGAIN±, CALOFF±) for system-level gain and offset correction, and supports automatic channel scanning across up to five signal inputs with minimal serial interface overhead. Input programming includes selectable unipolar/bipolar mode, gain from +1V/V to +128V/V, and input-referred DC offset compensation up to ±117% of full-scale range.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | 18-bit internal, 16-bit guaranteed no-missing-codes accuracy at 480sps |
| Input Channels | 3 fully differential or 5 pseudo-differential signal inputs plus 2 calibration inputs |
| Excitation Currents | Matched 200µA on-chip current sources (OUT1/OUT2) with ±1% initial tolerance |
| Power Consumption | 250µA quiescent current in operating mode; 2µA in power-down mode |
| Reference Input | Differential REFIN± accepts 2.50V nominal reference with ±5% tolerance for specified performance |
| Line Rejection | 150dB normal-mode 50Hz/60Hz rejection via programmable digital filter notch |
| Operating Temp | -40°C to +85°C, qualified for industrial environments |
Pinout & Package
The MAX1402EAI+ is housed in a 28-pin SSOP (shrink small-outline package) with exposed pad not electrically connected. Pin functions are defined per Maxim's official pin configuration diagram and verified against datasheet Table 1 and Pin Description section.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| CLKIN / CLKOUT | Master clock interface | Accepts 1.024MHz or 2.4576MHz external CMOS clock or crystal; enables programmable filter notch alignment |
| CS / SCLK / DOUT / DIN | 3-wire SPI/QSPI serial interface | Enables register access, data readout, and configuration with interrupt-driven timing via INT pin |
| AIN1–AIN6 | Signal input terminals | Support configurable differential pairs (e.g., AIN1/AIN2) or pseudo-differential topology with AIN6 as common |
| CALGAIN± / CALOFF± | Calibration channel inputs | Provide dedicated fully differential paths for system-level gain/offset correction or additional signal acquisition |
| OUT1 / OUT2 | Transducer excitation outputs | Deliver matched 200µA current sources with 1.0V compliance headroom above AGND and below V+ |
| REFIN+ / REFIN- | Differential reference inputs | Set ADC full-scale range; require externally stable 2.50V reference for specified 16-bit accuracy |
| INT | Interrupt output | Active-low signal indicates valid conversion result in data register; synchronizes host read operations |
Key Features
| Feature | Design Value |
|---|---|
| Programmable Decimation Filter | Enables selectable output data rates (20–480sps) and notch placement at 50Hz/60Hz for direct line-rejection without external hardware |
| On-Chip Sensor Excitation | Two matched 200µA current sources eliminate need for external precision current drivers in bridge sensor interfaces |
| Flexible Input Configuration | Three differential or five pseudo-differential signal channels plus two calibration inputs maximize channel utilization in space-constrained designs |
| Offset DAC Compensation | Integrated 16.7% FSR offset DAC corrects input-referred DC offsets up to ±117% of selected full-scale range |
| Wide Supply Range Support | Operates with +5V analog supply (±5%) and +2.7V to +5.25V digital supply, enabling compatibility with 3.3V or 5V microcontroller systems |
Applications
| Portable Weigh Scales | Loop-Powered Transmitters |
|---|---|
Use Scenario: Battery-operated handheld scales measuring load cell output in harsh field environments. IC Role / Device Role / Timing Role: Precision ADC digitizing mV-level bridge sensor signals with on-chip 200µA excitation and 50Hz line rejection. Use Value: Enables 16-bit resolution at 480sps while consuming only 250µA, extending battery life without sacrificing noise immunity. | Use Scenario: 4–20mA industrial transmitters powered from loop voltage with minimal headroom. IC Role / Device Role / Timing Role: Low-power ADC acquiring pressure/temperature sensor data with integrated excitation and calibration support. Use Value: Dual 200µA current sources and -40°C to +85°C operation allow single-chip sensor interface in constrained 3.5V–24V loop designs. |
| Pressure Transducers | Portable Industrial Instruments |
Use Scenario: MEMS or strain-gauge pressure sensors requiring ratiometric measurement and high CMR. IC Role / Device Role / Timing Role: Sigma-delta ADC with differential REFIN± inputs and 150dB CMR rejecting common-mode noise in noisy plant environments. Use Value: 16-bit accuracy and 150dB common-mode rejection ensure stable readings despite ground shifts and EMI in factory settings. | Use Scenario: Handheld multimeters or data loggers capturing multiple sensor types with minimal PCB area. IC Role / Device Role / Timing Role: Multichannel ADC supporting auto-scanned inputs (AIN1–AIN5), calibration channels, and SPI interface for MCU integration. Use Value: Five pseudo-differential inputs plus two calibration paths enable flexible front-end architecture without external multiplexers or op-amps. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar multichannel sigma-delta ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| AD7792BRUZ | 24-bit sigma-delta ADC, 16.7µA typical supply current, fixed 4.17–470sps output rates, no on-chip excitation current sources | Higher resolution but requires external excitation circuitry; better suited for ultra-low-power battery applications than sensor-integrated systems | Select AD7792BRUZ when ultimate resolution and lowest quiescent current outweigh need for integrated sensor drive |
| ADS124S08IPW | 24-bit delta-sigma ADC, 1.8–3.6V supply, integrated PGA (1–128x), no built-in excitation sources, SPI interface | Wider supply range and programmable gain amplifier simplify front-end design but lack matched current sources for bridge sensors | Select ADS124S08IPW for low-voltage systems needing flexible gain control, not for direct 200µA sensor excitation |
Compared with AD7792BRUZ and ADS124S08IPW, the MAX1402EAI+ uniquely combines 16-bit accuracy at 480sps, matched on-chip 200µA excitation, and 50Hz/60Hz notch filtering-making it optimal for compact, loop-powered industrial sensor nodes where board space and external component count must be minimized.
Availability
The MAX1402EAI+ is available at Aetrix Electronics and suitable for portable industrial instruments, loop-powered transmitters, and pressure transducer systems requiring stable component supply across extended temperature ranges and long production lifecycles.
Supply support for MAX1402EAI+ 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 MAX1402EAI+ belongs to Maxim's high-accuracy, low-power sigma-delta ADC product line, engineered specifically for battery- and loop-powered sensor signal conditioning with integrated excitation and calibration resources.
FAQ
What is the maximum output data rate with guaranteed 16-bit no-missing-codes performance for the MAX1402EAI+?
The MAX1402EAI+ achieves guaranteed 16-bit accuracy with no missing codes at an output data rate of up to 480 samples per second (sps). This specification is validated across the full industrial temperature range (-40°C to +85°C) and applies when using the default decimation filter configuration with FS1 = 0. Higher data rates are possible at reduced effective resolution.
Does the MAX1402EAI+ include on-chip current sources for sensor excitation, and what are their key specifications?
Yes, the MAX1402EAI+ integrates two matched 200µA transducer excitation current sources (OUT1 and OUT2). These sources exhibit ±1% initial tolerance and 5ppm/°C drift, with a compliance voltage range from AGND to V+ – 1.0V. They are optimized for driving resistive bridge sensors in precision measurement applications.
Can the MAX1402EAI+ reject 50Hz and 60Hz line interference without external filtering components?
Yes, the MAX1402EAI+ provides programmable digital notch filtering that places nulls precisely at 50Hz and 60Hz (and associated harmonics) when configured with a 2.4576MHz or 1.024MHz master clock. This delivers up to 150dB normal-mode rejection, eliminating the need for external analog notch filters in AC-powered industrial environments.
What is the operating temperature range of the MAX1402EAI+, and how does it differ from the commercial-grade MAX1402CAI?
The MAX1402EAI+ is rated for -40°C to +85°C operation, qualifying it for industrial and extended-temperature applications. In contrast, the MAX1402CAI variant is specified only from 0°C to +70°C. Both share identical electrical performance and pinout, but the EAI grade undergoes additional screening for reliability under thermal stress.
How many analog input channels does the MAX1402EAI+ support, and how are they configured?
The MAX1402EAI+ supports three fully differential input channels (e.g., AIN1/AIN2, AIN3/AIN4, AIN5/AIN6) or five pseudo-differential channels using AIN6 as a common reference. Additionally, the CALGAIN± and CALOFF± pins serve as two fully differential calibration channels-or as extra signal inputs when calibration is disabled in auto-sequence mode.
MAX1402EAI+ 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:
- -
MAX1402EAI+ FAQ
1.How can I place an order for MAX1402EAI+ through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1402EAI+ 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 MAX1402EAI+ reliable?
The price and inventory of MAX1402EAI+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1402EAI+ is usually 5 days.
3.What payment methods are accepted for MAX1402EAI+?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1402EAI+ transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1402EAI+?
MAX1402EAI+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1402EAI+ 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 MAX1402EAI+?
For technical support, including MAX1402EAI+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1402EAI+ requirements.
6.How does Aetrix verify that MAX1402EAI+ is sourced from the original manufacturer or authorized distributors?
All MAX1402EAI+ 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 MAX1402EAI+ meets industry standards.
7.What is the process for return or replacement of MAX1402EAI+?
All MAX1402EAI+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX1402EAI+, 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 MAX1402EAI+ part is unused and in its original packaging.
Return procedure for MAX1402EAI+:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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