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Home > Products > Integrated Circuits (ICs) > Data Acquisition > Analog to Digital Converters (ADC)

Analog Devices Inc./Maxim Integrated MAX132EWG+

Name: MAX132EWG+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX132EWG+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX132EWG+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Analog to Digital Converters (ADC)

Package:: 24-SOIC (0.295", 7.50mm Width)

Datasheet:: MAX132EWG+.pdf

Description:: IC ADC 18BIT MULTI-SLOPE 24SOIC

Quantity:: RFQ Add To RFQ list

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Product details

Overview

The MAX132EWG+ from Maxim Integrated is an 18-bit plus sign, multi-slope integrating analog-to-digital converter (ADC) with serial interface, ±512mV full-scale input range (2µV/LSB), 16 conversions/sec guaranteed accuracy, and 50Hz/60Hz line rejection. It operates from ±5V supplies, draws only 60µA typical supply current, and supports user-programmable digital outputs (P0–P3) for external multiplexer or PGA control. Ideal for high-precision battery-powered instrumentation and industrial data acquisition.

For engineers reviewing the MAX132EWG+ datasheet, MAX132EWG+ pinout, MAX132EWG+ application, or MAX132EWG+ equivalent, key selection considerations include its ±18-bit resolution with averaging, 15µV_RMS noise floor, 60Hz/50Hz rejection timing modes, low-leakage ±2pA input, and compatibility with 32.768kHz crystal-based timing for stable metrology-grade conversion.

Technical Context

The MAX132EWG+ uses multi-slope integration architecture with fixed-integration time followed by deintegration of a known reference voltage, enabling high-resolution measurement without successive approximation or sigma-delta modulation. Its 50Hz/60Hz mode selection bit configures integration periods to exactly one AC line cycle (20ms or 16.67ms), achieving inherent line-frequency rejection without external filtering.

Conversion data is output in two's-complement format via a 4-wire serial interface (CS, SCLK, DIN, DOUT), supporting register-selectable reads of 18-bit result split across Output Register 0 (B3–B10) and Register 1 (B11–B18). Four programmable digital outputs (P0–P3) are controlled via Command Input Register 1 and retain state between conversions.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	±18-bit (including sign bit), achieved via multi-slope integration and averaging - delivers 2µV/LSB at ±512mV full scale
Accuracy	±0.006% FSR at 16 conv/sec - guarantees linearity and zero error over temperature for metrology-grade measurements
Input Range	±512mV pseudo-differential across IN HI/IN LO - optimized for sensor interfaces with high source impedance
Supply Current	60µA typical (normal), 1µA in sleep mode - enables multi-year battery life in portable instruments
Line Rejection	50Hz/60Hz rejection via selectable integration period - eliminates need for external notch filters in noisy industrial environments
Input Leakage	±2pA typical at +25°C - preserves signal integrity when measuring from high-impedance transducers (e.g., strain gauges, thermocouples)
Output Interface	4-wire SPI-compatible serial (CS, SCLK, DIN, DOUT) with register-mapped access - simplifies microcontroller integration without parallel bus overhead

Pinout & Package

The MAX132EWG+ is housed in a 24-pin wide SO (Small Outline) package, 7.5mm body width, with standard JEDEC MS-013AC footprint and gull-wing leads.

Pin/Terminal	Circuit Role	Design Meaning
IN HI / IN LO (14, 15)	Pseudo-differential analog input	Accepts ±512mV full-scale differential voltage; high-impedance CMOS inputs enable direct connection to sensors without buffering
REF+ / REF− (18, 17)	Differential reference inputs	Set full-scale range; require external 545mV (60Hz) or 655mV (50Hz) reference; REF− tied to AGND minimizes rollover error
CREF+ / CREF− (19, 20)	Reference capacitor terminals	Connect 0.1µF low-leakage capacitor (e.g., polypropylene); critical for scale-factor stability during deintegration phase
INT IN / INT OUT (21, 22)	Integrator node interface	Connect external 602kΩ resistor and 4.7nF capacitor; INT OUT drives capacitor outer foil to reduce dielectric absorption effects
OSC1 / OSC2 (6, 5)	Crystal oscillator terminals	Drive 32.768kHz tuning-fork crystal; internal oscillator sets conversion rate and enables precise 50/60Hz rejection timing
CS / SCLK / DIN / DOUT (1, 4, 2, 3)	Serial interface control and data	4-wire synchronous serial port; CS rising edge latches commands, falling edge loads output data, DOUT three-states when CS high
P0–P3 (7, 8, 9, 10)	User-programmable digital outputs	Configurable via Command Register 1; used to control external multiplexers, PGAs, or calibration switches without MCU GPIO overhead
EOC (11)	End-of-conversion indicator	Active-high open-drain output signals completion; can be polled or used to trigger interrupt-driven data read
V+ / V− (24, 13)	Analog power supplies	±5V nominal dual supplies; must remain within ±0.3V of rails to avoid damage; supports ±512mV input swing
AGND / DGND (16, 12)	Analog and digital ground returns	Separate ground pins minimize digital switching noise coupling into sensitive analog integrator path
BUF OUT (23)	Buffer amplifier output	Drives integrator resistor; internal buffer isolates integrator from input stage, improving common-mode rejection
INT OUT (22)	Integrator output	Direct connection point for integrator capacitor; routing to capacitor outer foil reduces dielectric absorption-induced nonlinearity

Key Features

Feature	Design Value
Multi-slope integration architecture	Enables 18-bit resolution with low noise (15µV_RMS) and inherent 50/60Hz line rejection - no external filter components required
Programmable digital outputs (P0–P3)	Four user-configurable pins controlled via serial command register - eliminate need for external I/O expanders in multi-channel systems
Read-zero calibration function	Internally shorts IN HI/IN LO on command - enables real-time offset correction for drift compensation in weigh scales and panel meters
Sleep mode with active interface	Reduces supply current to 1µA while retaining serial port accessibility - allows wake-on-command without full power-up delay
Two's-complement serial output coding	Direct bipolar measurement support - simplifies software handling of signed values in microcontroller firmware

Applications

Remote Data Acquisition	Battery-Powered Instruments
Use Scenario: Long-term environmental monitoring using solar-charged sensors deployed in unattended field locations. IC Role / Device Role / Timing Role: Primary ADC digitizing thermistor, pressure, and humidity sensor outputs with metrology-grade accuracy and ultra-low power consumption. Use Value: 1µA sleep current extends multi-year operation; 50Hz/60Hz rejection ensures clean readings near AC infrastructure without hardware filtering.	Use Scenario: Portable handheld multimeter or calibration standard requiring precision DC voltage/current measurement. IC Role / Device Role / Timing Role: High-resolution ADC core with integrated reference scaling and programmable gain control via P0–P3 outputs. Use Value: ±0.006% FSR accuracy and ±2pA input leakage preserve fidelity across decades of input impedance; serial interface reduces MCU pin count.
Industrial Process Control	Transducer-Signal Measurement
Use Scenario: Analog input module in PLC rack measuring 4–20mA loop signals and RTD/thermocouple outputs. IC Role / Device Role / Timing Role: Isolated ADC front-end with programmable gain and digital output control for channel multiplexing and sensor excitation. Use Value: P0–P3 outputs directly drive analog multiplexers and current sources; ±512mV input range matches standard industrial signal conditioning stages.	Use Scenario: Strain gauge bridge readout in load cells and pressure transducers where microvolt-level resolution is critical. IC Role / Device Role / Timing Role: Precision integrating ADC with low-noise input stage and read-zero calibration for thermal drift compensation. Use Value: 15µV_RMS noise and ±2pA leakage prevent signal corruption from high-Z bridges; rollover error <0.01% FSR ensures stable zero-point over temperature.

Remote Data Acquisition

Battery-Powered Instruments

Use Scenario: Long-term environmental monitoring using solar-charged sensors deployed in unattended field locations.

IC Role / Device Role / Timing Role: Primary ADC digitizing thermistor, pressure, and humidity sensor outputs with metrology-grade accuracy and ultra-low power consumption.

Use Value: 1µA sleep current extends multi-year operation; 50Hz/60Hz rejection ensures clean readings near AC infrastructure without hardware filtering.

Use Scenario: Portable handheld multimeter or calibration standard requiring precision DC voltage/current measurement.

IC Role / Device Role / Timing Role: High-resolution ADC core with integrated reference scaling and programmable gain control via P0–P3 outputs.

Use Value: ±0.006% FSR accuracy and ±2pA input leakage preserve fidelity across decades of input impedance; serial interface reduces MCU pin count.

Industrial Process Control

Transducer-Signal Measurement

Use Scenario: Analog input module in PLC rack measuring 4–20mA loop signals and RTD/thermocouple outputs.

IC Role / Device Role / Timing Role: Isolated ADC front-end with programmable gain and digital output control for channel multiplexing and sensor excitation.

Use Value: P0–P3 outputs directly drive analog multiplexers and current sources; ±512mV input range matches standard industrial signal conditioning stages.

Use Scenario: Strain gauge bridge readout in load cells and pressure transducers where microvolt-level resolution is critical.

IC Role / Device Role / Timing Role: Precision integrating ADC with low-noise input stage and read-zero calibration for thermal drift compensation.

Use Value: 15µV_RMS noise and ±2pA leakage prevent signal corruption from high-Z bridges; rollover error <0.01% FSR ensures stable zero-point over temperature.

Equivalent & Alternatives

The following parts are listed as comparable options for similar high-resolution integrating ADC applications.

Alternative Part	Technical Difference	Application Difference	Selection Advice
ADS1258IRHBT	24-bit delta-sigma ADC, 125kSPS max, single-ended input, internal PGA, no 50/60Hz rejection mode	Higher resolution but lacks built-in line-frequency rejection; requires external digital filtering for AC noise suppression	Choose for higher speed or greater resolution where line rejection is handled digitally or not required
LTC2440CGN#PBF	24-bit delta-sigma ADC, 10SPS, built-in 50/60Hz rejection, differential input, 1.2µA typical supply current	Lower power and same line-rejection capability, but slower throughput (10 vs 16 conv/sec) and no programmable digital outputs	Choose for ultra-low-power applications where P0–P3 functionality is unnecessary and 10SPS suffices

Compared with ADS1258IRHBT and LTC2440CGN#PBF, the MAX132EWG+ uniquely combines 18-bit integrating accuracy, hardware 50/60Hz rejection, four programmable outputs, and 16 conv/sec throughput in a single SO-24 package - making it optimal for compact, self-contained industrial metering designs.

Availability

The MAX132EWG+ is available at Aetrix Electronics and suitable for remote data acquisition, battery-powered instrumentation, and industrial process control requiring stable component supply and long-term production continuity.

Supply support for MAX132EWG+ 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 MAX132EWG+ belongs to Maxim's high-accuracy integrating ADC product line, engineered specifically for metrology-grade applications including weigh scales, panel meters, and data loggers where line-frequency rejection and low power are essential.

FAQ

What is the guaranteed accuracy specification for the MAX132EWG+ at its rated conversion rate?

The MAX132EWG+ is guaranteed to deliver ±0.006% of full-scale range (FSR) integral nonlinearity at 16 conversions per second, tested across the −40°C to +85°C operating temperature range. This specification includes zero error, rollover error, and linearity deviation under defined conditions (V+ = 5V, V− = −5V, f_CLK = 32.768kHz, 60Hz mode). Accuracy degrades to approximately ±0.012% FSR at 100 conv/sec, where the MAX132EWG+ operates in high-speed mode without line rejection.

How does the MAX132EWG+ achieve 50Hz and 60Hz line-frequency rejection?

The MAX132EWG+ achieves hardware-based 50Hz/60Hz rejection by configuring its multi-slope integration period to exactly one AC line cycle: 20ms for 50Hz (655 clock counts) or 16.67ms for 60Hz (545 clock counts), both synchronized to a 32.768kHz crystal. This eliminates common-mode noise before digitization, removing the need for external analog filters or digital post-processing. The mode is selected via the 50Hz/60Hz bit in Command Input Register 0.

What are the recommended external components for the MAX132EWG+ reference and integrator circuits?

The MAX132EWG+ requires a 0.1µF low-leakage reference capacitor (polypropylene or polystyrene), a 602kΩ metal-film integrator resistor, and a 4.7nF integrator capacitor - all specified for use with a 32.768kHz crystal. REF+ should be driven with 545mV (60Hz mode) or 655mV (50Hz mode) from a low-noise source like the MAX872. CREF− must connect to AGND to minimize rollover error, and INT OUT must drive the outer foil of the integrator capacitor to reduce dielectric absorption effects.

Can the MAX132EWG+ operate from a single supply, or does it require dual rails?

The MAX132EWG+ requires dual analog supplies: V+ nominally at +5V and V− nominally at −5V. It cannot operate from a single supply because its ±512mV pseudo-differential input range and internal integrator architecture depend on symmetric rail-to-rail headroom. Supply voltages must stay within absolute maximum ratings: V+ between −0.3V and +6.0V relative to DGND, and V− between +0.3V and −9.0V relative to DGND. Operation outside these ranges risks permanent damage.

What is the function of the P0–P3 pins on the MAX132EWG+, and how are they controlled?

The P0–P3 pins on the MAX132EWG+ are user-programmable digital outputs controlled exclusively via Command Input Register 1. Bits D4–D7 of that register set the logic states of P0–P3 respectively. These outputs retain their programmed state between conversions and can drive external devices such as analog multiplexers, programmable-gain amplifiers, or calibration switches - reducing system-level component count and MCU GPIO usage. They are not affected by conversion activity or sleep mode entry/exit.

MAX132EWG+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 24-SOIC (0.295", 7.50mm Width)

Packaging:: Tube

Product Status:: Active

Number of Bits:: 18

Sampling Rate (Per Second):: 100

Number of Inputs:: 1

Input Type:: Pseudo-Differential

Data Interface:: SPI

Configuration:: ADC

Ratio - S/H:ADC:: -

Number of A/D Converters:: 1

Architecture:: Multi-Slope

Reference Type:: External

Voltage - Supply, Analog:: ±5V

Voltage - Supply, Digital:: ±5V

Features:: PGA

Operating Temperature:: -40°C ~ 85°C

Supplier Device Package:: 24-SOIC

Mounting Type:: Surface Mount

Grade:: -

Qualification:: -

MAX132EWG+ FAQ

1.How can I place an order for MAX132EWG+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX132EWG+ 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 MAX132EWG+ reliable?

The price and inventory of MAX132EWG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX132EWG+ is usually 5 days.

3.What payment methods are accepted for MAX132EWG+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX132EWG+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX132EWG+?

MAX132EWG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX132EWG+ 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 MAX132EWG+?

For technical support, including MAX132EWG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX132EWG+ requirements.

6.How does Aetrix verify that MAX132EWG+ is sourced from the original manufacturer or authorized distributors?

All MAX132EWG+ 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 MAX132EWG+ meets industry standards.

7.What is the process for return or replacement of MAX132EWG+?

All MAX132EWG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX132EWG+, 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 MAX132EWG+ part is unused and in its original packaging.

Return procedure for MAX132EWG+:

1.Submit a request within 90 days.

2.Obtain a Return Material Authorization (RMA) from Aetrix.

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