My Inquiry
My Account
Analog Devices Inc./Maxim Integrated MAX1402CAI+T
- Part No.:
- MAX1402CAI+T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 28-SSOP (0.209", 5.30mm Width)
- Datasheet:
-
MAX1402CAI+T.pdf
- Description:
- IC ADC 18BIT SIGMA-DELTA 28SSOP
- Quantity:
- Payment:
- Shipping:
Inventory:4,570
Please send an inquiry. Send us your inquiry, and we will respond immediately.
Product details
Overview
MAX1402CAI+T 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 MAX1402CAI+T datasheet, MAX1402CAI+T pinout, MAX1402CAI+T application, or MAX1402CAI+T equivalent, this device supports programmable gain (1–128V/V), automatic channel scanning, line-frequency rejection (50/60Hz notch filtering), and SPI/QSPI-compatible 3-wire serial interface - all in a 28-pin SSOP package rated for 0°C to +70°C operation.
Technical Context
The MAX1402CAI+T employs a sigma-delta modulator with digital decimation filtering, enabling selectable decimation factors to trade resolution for throughput - achieving true 16-bit performance at 480sps or higher rates with reduced resolution. Its modulator sampling frequency is configurable for lowest power dissipation or highest throughput, and it supports master clock inputs of 1.024MHz or 2.4576MHz.
It integrates two fully differential calibration channels (CALGAIN±, CALOFF±) for system-level gain and offset correction, and features an offset DAC with ±116.7% FSR range for input-referred DC offset compensation. Input common-mode voltage range spans AGND to V+ − 1.5V, with absolute AIN voltage limits of AGND − 30mV to V+ + 200mV.
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 + 2 calibration inputs |
| Gain Range | Programmable 1× to 128× (V/V), nominal gain = 0.98 to prevent saturation |
| Current Sources | Matched 200µA transducer excitation outputs (OUT1/OUT2), ±1% initial tolerance |
| Power Consumption | 250µA operating current (V+), 2µA in power-down mode; 26.7mW typical at 480sps |
| Line Rejection | 150dB common-mode rejection, 100dB normal-mode 50/60Hz rejection via programmable digital filter notch |
| Reference Input | Differential REFIN± accepts 2.50V nominal (±5% for specified performance) |
Pinout & Package
MAX1402CAI+T is housed in a 28-pin SSOP (shrink small-outline package) with 0.635mm pitch, JEDEC MO-153 compliant, footprint code A28-2. Thermal pad not present; exposed die attach pad absent.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 CLKIN | Master clock input | Accepts 0.8–5.0MHz CMOS clock; enables crystal oscillator mode when paired with CLKOUT |
| 3 CS | Chip-select input | Active-low enable for 3-wire SPI/QSPI interface; allows continuous SCLK operation when tied low |
| 8 OUT1 / 7 OUT2 | Transducer excitation outputs | Matched 200µA current sources with ±1% initial tolerance and ±100ppm/°C drift |
| 11–14, 16 AIN1–AIN6 | Analog signal inputs | Support 3 differential (AIN1/2, AIN3/4, AIN5/6) or 5 pseudo-differential configurations using AIN6 as common |
| 17–18 CALGAIN± | System gain calibration inputs | Provide auxiliary fully differential input channel when calibration unused in auto-scan mode |
| 21–22 CALOFF± | System offset calibration inputs | Enable offset correction up to ±116.7% of selected full-scale range; also serve as auxiliary inputs |
| 19–20 REFIN± | Differential reference inputs | Set conversion scale; require 2.50V differential, biased between AGND and V+ |
| 24 VDD | Digital supply | +2.7V to +5.25V operation; supports 3V or 5V logic interfaces independently of analog supply |
| 10 V+ | Analog supply | +4.75V to +5.25V; supplies modulator, analog front-end, and excitation current sources |
| 25 INT | Interrupt output | Active-low flag indicating new conversion result ready; pulses high after full-word read completion |
Key Features
| Feature | Design Value |
|---|---|
| Programmable decimation filter | Selectable notch frequencies (50/60Hz) eliminate need for external line-frequency post-filtering |
| On-chip sensor excitation | Two matched 200µA current sources reduce BOM count and improve ratiometric accuracy in bridge sensor interfaces |
| Auto-channel scanning mode | Hardware-sequenced conversion across all inputs minimizes host MCU intervention and serial overhead |
| Offset DAC with wide range | ±116.7% FSR adjustment compensates large input-referred DC offsets without external op-amps |
| Dual-supply flexibility | Independent +5V analog (V+) and +3V/+5V digital (VDD) rails simplify mixed-voltage system integration |
Applications
| Portable Weigh Scales | Loop-Powered 4–20mA Transmitters |
|---|---|
|
Use Scenario: Battery-operated handheld scales measuring load cells with mV/V output under variable temperature. IC Role / Device Role / Timing Role: Precision ADC digitizing low-level differential bridge signals while rejecting 50/60Hz ambient noise and compensating thermal offset drift. Use Value: 16-bit no-missing-codes accuracy at 480sps enables <1g resolution in 10kg full-scale designs; matched excitation currents ensure ratiometric stability. |
Use Scenario: Two-wire field transmitter converting pressure/temperature sensor output into 4–20mA loop current with HART modulation capability. IC Role / Device Role / Timing Role: Low-power ADC providing high-resolution sensor digitization within strict 3.5mA loop budget, interfacing directly to loop driver IC. Use Value: 250µA operating current (V+) and 2µA power-down mode extend battery life; 28-pin SSOP fits compact PCB layouts with minimal external components. |
| Industrial Pressure Transducers | Portable Multifunction Data Loggers |
|
Use Scenario: DIN-rail mounted pressure sensor module with integrated temperature compensation and digital output via RS-485. IC Role / Device Role / Timing Role: Primary ADC acquiring conditioned bridge and RTD signals, performing on-chip gain/offset calibration before SPI transmission. Use Value: CALGAIN± and CALOFF± inputs enable one-time system calibration during manufacturing, eliminating field recalibration labor and improving long-term accuracy. |
Use Scenario: Handheld environmental monitor logging temperature, humidity, and gas concentration using multiple analog sensor types. IC Role / Device Role / Timing Role: Multichannel front-end ADC supporting flexible input configuration (differential/pseudo-differential) and automatic sequencing across diverse sensor outputs. Use Value: Five pseudo-differential channels allow simultaneous connection of 5 single-ended sensors with shared AIN6 reference, reducing external multiplexer complexity. |
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 |
|---|---|---|---|
| ADS1258IRTCR | 24-bit resolution, 125kSPS max, 8-channel, requires external reference and excitation; no on-chip current sources | Better resolution/speed but higher power (4.1mA); lacks integrated 200µA excitation for direct bridge drive | Choose ADS1258IRTCR for ultra-high-resolution lab-grade instruments where external excitation is acceptable |
| AD7798BRUZ | 16-bit, 4-channel, 480sps, 250µA excitation, SPI interface, 16-pin TSSOP; no pseudo-differential mode or CAL inputs | Smaller footprint and lower cost, but limited to 4 inputs and no system calibration channel support | Choose AD7798BRUZ for space-constrained, cost-sensitive 4-channel applications without calibration requirements |
Compared with ADS1258IRTCR and AD7798BRUZ, the MAX1402CAI+T uniquely combines on-chip matched excitation, five pseudo-differential inputs, and dedicated calibration channels - making it optimal for portable, self-calibrating industrial sensor nodes requiring minimal external components and robust line-noise immunity.
Availability
MAX1402CAI+T is available at Aetrix Electronics and suitable for portable industrial instruments, loop-powered transmitters, and pressure transducer modules requiring stable component supply across extended production lifecycles.
Supply support for MAX1402CAI+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) is a U.S.-based semiconductor company specializing in high-performance analog, mixed-signal, and power-management ICs for industrial, medical, and communications markets.
The MAX1402CAI+T belongs to Maxim's precision data-acquisition product line, designed specifically for low-power, high-accuracy sensor interfacing in battery-operated and loop-powered industrial measurement systems.
FAQ
What is the operating temperature range for the MAX1402CAI+T?
The MAX1402CAI+T is specified for commercial temperature operation from 0°C to +70°C. This range is confirmed by the 'CAI' suffix in the part number and matches the ordering information table, which lists MAX1402CAI with 0°C to +70°C range and A28-2 SSOP packaging. It is not rated for extended industrial or automotive temperature ranges.
Does the MAX1402CAI+T support both 3V and 5V digital I/O interfaces?
Yes, the MAX1402CAI+T supports dual digital supply operation: VDD accepts +2.7V to +5.25V, allowing direct interfacing with either 3.3V or 5V microcontrollers. Logic thresholds scale with VDD (VIH = 0.7×VDD, VIL = 0.3×VDD), and output drive strength is specified for both 3.3V and 5V conditions - ensuring reliable SPI/QSPI communication across mixed-voltage systems.
How does the MAX1402CAI+T achieve 50Hz/60Hz line-frequency rejection?
The MAX1402CAI+T achieves 100dB normal-mode and 150dB common-mode 50/60Hz rejection through its programmable digital decimation filter. When configured with a 2.4576MHz or 1.024MHz master clock and appropriate filter control bits (MF1/MF0), the filter places precise notches at line frequency and harmonics - eliminating the need for external analog notch filters or software-based digital post-processing.
Can the MAX1402CAI+T be used with single-ended sensors?
Yes, the MAX1402CAI+T supports pseudo-differential operation: five single-ended inputs (AIN1–AIN5) can share AIN6 as a common reference node, effectively enabling single-ended sensor connections. This configuration is explicitly documented in the Pin Description and General Description sections, and does not require external level-shifting circuitry.
What is the purpose of the CALGAIN± and CALOFF± pins on the MAX1402CAI+T?
The CALGAIN± and CALOFF± pins on the MAX1402CAI+T serve dual roles: they provide dedicated inputs for system-level gain and offset calibration during manufacturing, and - when calibration is disabled in auto-sequence mode - function as two additional fully differential analog input channels. This design maximizes channel utilization without requiring external switches or muxes.
MAX1402CAI+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:
- 5V
- Voltage - Supply, Digital:
- 2.7V ~ 5.25V
- Features:
- PGA
- Operating Temperature:
- 0°C ~ 70°C
- Supplier Device Package:
- 28-SSOP
- Mounting Type:
- Surface Mount
- Grade:
- -
- Qualification:
- -
MAX1402CAI+T FAQ
1.How can I place an order for MAX1402CAI+T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX1402CAI+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 MAX1402CAI+T reliable?
The price and inventory of MAX1402CAI+T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX1402CAI+T is usually 5 days.
3.What payment methods are accepted for MAX1402CAI+T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX1402CAI+T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX1402CAI+T?
MAX1402CAI+T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX1402CAI+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 MAX1402CAI+T?
For technical support, including MAX1402CAI+T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX1402CAI+T requirements.
6.How does Aetrix verify that MAX1402CAI+T is sourced from the original manufacturer or authorized distributors?
All MAX1402CAI+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 MAX1402CAI+T meets industry standards.
7.What is the process for return or replacement of MAX1402CAI+T?
All MAX1402CAI+T units undergo pre-shipment inspection (PSI). If there is an issue with MAX1402CAI+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 MAX1402CAI+T part is unused and in its original packaging.
Return procedure for MAX1402CAI+T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
MAX1402CAI+T Tags
-
ADC081C021CIMKX/NOPB
Texas Instruments
-
MCP3021A5T-E/OT
Microchip Technology
-
TLA2024IRUGR
Texas Instruments
-
MCP3221A5T-E/OT
Microchip Technology
-
MCP3221A5T-I/OT
Microchip Technology
-
MCP3221A4T-E/OT
Microchip Technology
-
MCP3221A6T-E/OT
Microchip Technology
-
MCP3221A0T-E/OT
Microchip Technology
-
MCP3221A1T-E/OT
Microchip Technology
-
ADC121S021CIMFX/NOPB
Texas Instruments
-
MCP3001-I/MS
Microchip Technology
-
MCP3001-I/SN
Microchip Technology
Tech Hub
A practical engineering guide to 3.3V and 5V logic compatibility, input thresholds, resistor dividers, translator ICs, MOSFET level shifting, I2C pull-ups, timing limits and power-sequencing risks.
The 74HC595 uses push-pull logic outputs, while the TPIC6B595 uses 50 V open-drain DMOS sinks for higher-power loads. This guide compares timing, current limits, 3.3 V interfacing, load wiring, thermal…
The 74HC595 converts serial data into eight stable parallel outputs. This guide covers pin functions, shift and storage timing, OE and MR behavior, drive-current limits, cascading, voltage compatibilit…
A technical comparison of level-sensitive latches and edge-triggered flip-flops, covering timing windows, setup and hold limits, master–slave operation, time borrowing, race-through, HDL inference and…
A D latch stores one bit while Enable controls when data can pass. This reference covers gate-level operation, truth tables, transparency, setup and hold timing, LE versus OE, common ICs and practical …
An SR latch stores one bit through cross-coupled feedback. This engineering reference covers NOR and NAND implementations, truth tables, forbidden-state recovery, gated operation, switch debouncing, fa…
Latch circuits retain one bit through feedback. This technical reference covers SR and D latches, truth tables, transparency, timing limits, latch-versus-flip-flop behavior, applications and common log…
An engineering guide to LED driver operation, constant-current and constant-voltage outputs, linear and switching topologies, dimming, IC selection, calculations, replacement compatibility, and fault c…
Operational amplifier guide covering op amp basics, feedback, ideal vs real op amps, common configurations, buffer circuits, offset, bias current, gain-bandwidth, slew rate, rail-to-rail limits and sel…
Jumper cables guide covering safe connection order, red and black clamp placement, final ground connection, cable gauge, length, clamp quality, copper vs CCA cables, jump starter comparison and battery…
