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

Analog Devices Inc./Maxim Integrated MAX132ENG+

Name: MAX132ENG+
Brand: Analog Devices Inc./Maxim Integrated
SKU: MAX132ENG+
Price: 2.40 USD
Availability: InStock
Rating: 5 (2 reviews)

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Part No.:: MAX132ENG+

Manufacturer:: Analog Devices Inc./Maxim Integrated

Category:: Analog to Digital Converters (ADC)

Package:: 24-DIP (0.300", 7.62mm)

Datasheet:: MAX132ENG+.pdf

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

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Product details

Overview

MAX132ENG+ 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), 100 conversions/sec max throughput, and 15µV_RMS noise. It operates from ±5V supplies, draws 60µA typical supply current, and supports 50Hz/60Hz line rejection for precision measurement in battery-powered instrumentation.

For engineers reviewing the MAX132ENG+ datasheet, MAX132ENG+ pinout, MAX132ENG+ application, or MAX132ENG+ equivalent, this page delivers verified technical context, validated pin functions, real-world use scenarios, and confirmed alternative options - all grounded in Maxim's official documentation and electrical specifications.

Technical Context

The MAX132ENG+ uses multi-slope integration architecture to achieve ±18-bit resolution with guaranteed ±0.006% FSR accuracy at 16 conv/sec, leveraging a fixed integration time synchronized to 50Hz or 60Hz line cycles via internal oscillator control. Its twos-complement output coding enables direct bipolar signal processing without external sign handling.

It features four user-programmable digital outputs (P0–P3), a 4-wire serial interface (CS/DIN/SCLK/DOUT), and integrated sleep mode reducing current to 1µA. Input leakage is ±2pA typical, common-mode rejection exceeds ±3.1% FSR, and reference inputs (REF+/REF−) support differential configuration to minimize rollover error.

Key Specifications

Parameter	Value and Actual Design Meaning
Resolution	±18-bit (including sign bit); delivers 2µV/LSB step size over ±512mV full-scale range
Accuracy	±0.006% FSR integral nonlinearity at 16 conv/sec; tested and guaranteed per datasheet
Conversion Rate	Up to 100 conv/sec (reduced accuracy); 16 conv/sec with full 50Hz/60Hz rejection enabled
Input Noise	15µV_RMS; measured under standard conditions (f_CLK = 32.768kHz, 60Hz mode)
Supply Current	60µA typical active; 1µA in sleep mode - enables multi-year battery life in portable instruments
Input Leakage	±2pA typical at +25°C; supports high-impedance sensor interfaces without loading error
Common-Mode Rejection	±3.1% FSR minimum; critical for stable readings in noisy industrial environments

Pinout & Package

MAX132ENG+ is supplied in a 24-pin narrow plastic DIP package (0.300" width), RoHS-compliant and rated for -40°C to +85°C operation.

Pin/Terminal	Circuit Role	Design Meaning
1 CS	Chip Select	3-function control: enables serial communication, loads command registers on rising edge, latches output data on falling edge
2 DIN	Serial Data Input	Accepts 8-bit command packets on SCLK rising edge; D7 first; controls register selection and P0–P3 states
3 DOUT	Serial Data Output	Outputs conversion data (B18–B3) on SCLK falling edge; high-impedance when CS high
4 SCLK	Serial Clock	Master clock for synchronous serial I/O; rising edge clocks DIN, falling edge clocks DOUT
7 P0	User-Programmable Output	Configurable via serial port to drive external multiplexer or PGA enable lines
8 P1	User-Programmable Output	Same control mechanism as P0; supports dynamic gain or channel switching
9 P2	User-Programmable Output	Third programmable bit; used for system-level sequencing or calibration control
10 P3	User-Programmable Output	Fourth independent output; extends flexibility for multi-channel or multi-range designs
11 EOC	End-of-Conversion Flag	Active-high open-drain signal indicating completion of conversion cycle
12 DGND	Digital Ground	Separate ground return for digital section; must be tied to AGND at single point
13 V−	Negative Supply	Nominally −5V; absolute max −9V; required for dual-supply operation and bipolar input range
14 IN HI	Positive Analog Input	Pseudo-differential input pin; accepts voltage up to 2V below V+ or above V−
15 IN LO	Negative Analog Input	Paired with IN HI; defines differential input span; referenced to AGND
16 AGND	Analog Ground	Reference for analog section; isolation from DGND reduces digital noise coupling
17 REF−	Negative Reference Input	Differential reference terminal; connect to AGND to minimize rollover error
18 REF+	Positive Reference Input	Accepts 500–700mV reference voltage; sets full-scale input range (e.g., 545mV for 60Hz mode)
19 CREF+	Positive Reference Capacitor	Connects to 0.1µF low-leakage capacitor (polypropylene/teflon) for stable scale factor
20 CREF−	Negative Reference Capacitor	Completes reference capacitor connection; ties to REF− for optimal charge retention
21 INT IN	Integrator Input	Connects integrator capacitor (4.7nF typical) between INT IN and INT OUT
22 INT OUT	Integrator Output	Drives outside foil of integrator capacitor to reduce dielectric absorption effects
23 BUF OUT	Buffer Amplifier Output	Drives integrator resistor (602kΩ typical); provides low-impedance source for integration
24 V+	Positive Supply	Nominally +5V; absolute max +6V; powers analog and digital sections

Key Features

Feature	Design Value
Multi-slope integration	Enables 18-bit resolution with faster conversion than dual-slope ADCs while maintaining linearity
50Hz/60Hz line rejection	Configurable integration period (545 or 655 clock counts) eliminates power-line interference without external filters
Four programmable outputs (P0–P3)	Eliminates need for external GPIO expanders when controlling multiplexers or PGAs in compact systems
Sleep mode (1µA)	Extends battery life in portable data loggers by powering down oscillator and analog core while retaining serial interface readiness
Twos-complement serial output	Simplifies firmware implementation for bipolar measurements - no software sign extension or offset correction needed
±2pA input leakage	Preserves signal integrity from high-Z sources like strain gauges or thermocouples without external buffering

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 capturing low-drift voltage outputs from pressure, temperature, and humidity transducers. Use Value: 15µV_RMS noise and 1µA sleep current enable >5-year deployment without maintenance or battery replacement.	Use Scenario: Handheld multimeter with auto-ranging and 6½-digit display requiring high DC accuracy and low power. IC Role / Device Role / Timing Role: Precision front-end ADC performing 16 conv/sec measurements with 50Hz/60Hz rejection in AC-coupled environments. Use Value: ±0.006% FSR accuracy and ±512mV input range eliminate need for external gain stages or calibration offsets.
Industrial Process Control	Transducer-Signal Measurement
Use Scenario: PLC analog input module measuring 4–20mA loop signals across multiple channels with shared reference. IC Role / Device Role / Timing Role: High-resolution ADC interfacing to isolated current-to-voltage converters with programmable gain control via P0–P3. Use Value: Four programmable outputs directly switch external PGAs, enabling automatic range scaling without FPGA or microcontroller overhead.	Use Scenario: Weigh scale electronics converting mV-level bridge outputs from load cells into digital weight values. IC Role / Device Role / Timing Role: Integrating ADC rejecting 50Hz/60Hz noise from nearby motors and lighting ballasts while resolving sub-microvolt signals. Use Value: Multi-slope architecture achieves 18-bit resolution with <1ppm drift, meeting OIML R76 Class III accuracy requirements.

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 capturing low-drift voltage outputs from pressure, temperature, and humidity transducers.

Use Value: 15µV_RMS noise and 1µA sleep current enable >5-year deployment without maintenance or battery replacement.

Use Scenario: Handheld multimeter with auto-ranging and 6½-digit display requiring high DC accuracy and low power.

IC Role / Device Role / Timing Role: Precision front-end ADC performing 16 conv/sec measurements with 50Hz/60Hz rejection in AC-coupled environments.

Use Value: ±0.006% FSR accuracy and ±512mV input range eliminate need for external gain stages or calibration offsets.

Industrial Process Control

Transducer-Signal Measurement

Use Scenario: PLC analog input module measuring 4–20mA loop signals across multiple channels with shared reference.

IC Role / Device Role / Timing Role: High-resolution ADC interfacing to isolated current-to-voltage converters with programmable gain control via P0–P3.

Use Value: Four programmable outputs directly switch external PGAs, enabling automatic range scaling without FPGA or microcontroller overhead.

Use Scenario: Weigh scale electronics converting mV-level bridge outputs from load cells into digital weight values.

IC Role / Device Role / Timing Role: Integrating ADC rejecting 50Hz/60Hz noise from nearby motors and lighting ballasts while resolving sub-microvolt signals.

Use Value: Multi-slope architecture achieves 18-bit resolution with <1ppm drift, meeting OIML R76 Class III accuracy requirements.

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; 30kSPS max; requires external reference; no built-in 50/60Hz rejection logic	Higher resolution but lacks integrated line-rejection timing; needs DSP post-processing for AC noise suppression	Choose ADS1258IRHBT when >18-bit resolution is mandatory and system has processing headroom for digital filtering
LTC2440CGN#PBF	24-bit delta-sigma ADC; 1.5SPS typ; built-in 50/60Hz rejection; 1.2µV_RMS noise; SPI interface	Lower speed (1.5SPS vs 100SPS), superior noise floor, but no P0–P3 programmable outputs	Choose LTC2440CGN#PBF for ultra-low-noise, low-speed metrology where GPIO control is handled externally

Compared with MAX132ENG+, ADS1258IRHBT offers higher raw resolution but demands external filtering for line-frequency rejection, while LTC2440CGN#PBF delivers lower noise at much lower throughput and omits the integrated programmable outputs essential for autonomous multiplexer control.

Availability

MAX132ENG+ is available at Aetrix Electronics and suitable for remote data acquisition, battery-powered instrumentation, and industrial process control applications requiring stable component supply, long-lifecycle support, and guaranteed extended-temperature performance.

Supply support for MAX132ENG+ 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, medical, and communications systems.

The MAX132ENG+ belongs to Maxim's precision data-acquisition ADC family, designed specifically for low-power, high-accuracy measurement in harsh or resource-constrained environments where line-frequency immunity and minimal external components are critical.

FAQ

What is the guaranteed accuracy specification for MAX132ENG+ at its maximum conversion rate?

The MAX132ENG+ is tested and guaranteed at ±0.006% FSR integral nonlinearity at 16 conversions per second with 50Hz/60Hz rejection enabled. At its maximum rate of 100 conv/sec, accuracy degrades to approximately ±0.012% FSR (±13-bit effective resolution), as documented in the datasheet's "Increased Speed" section. This trade-off reflects reduced integration time and increased susceptibility to noise - users must validate system-level accuracy against their specific timing and filtering constraints. The MAX132ENG+ does not guarantee 18-bit performance above 16 conv/sec.

Does MAX132ENG+ support true differential input, or is it pseudo-differential?

The MAX132ENG+ implements a pseudo-differential input architecture: the analog input is applied across IN HI and IN LO pins, but IN LO is internally referenced to AGND and not actively driven. The device measures the voltage difference (IN HI – IN LO), yet IN LO must remain within 2V of either supply rail and cannot swing independently like a fully differential input stage. This architecture simplifies sensor interfacing while retaining high CMRR (±3.1% FSR) - confirmed in the Electrical Characteristics table and Functional Diagram. True differential input capability is not supported by the MAX132ENG+.

How does the read-zero function operate in MAX132ENG+, and when should it be used?

The read-zero function in MAX132ENG+ is activated by setting the read-zero bit (D6 in Command Input Register 0) to 1, which internally shorts IN HI to IN LO before conversion. This captures system offset error (zero drift, reference drift, amplifier offset) for subtraction from subsequent measurements. It should be performed periodically - especially after ambient temperature shifts >5°C, reference voltage changes, or common-mode voltage variations - and averaging 2–3 read-zero conversions improves accuracy. The MAX132ENG+ datasheet explicitly recommends this procedure in the "Digital Interface" section and Figure 9 timing diagram.

Can MAX132ENG+ operate with a single +5V supply, or does it require dual supplies?

The MAX132ENG+ requires dual supplies: nominally +5V on V+ and −5V on V−, as specified in Absolute Maximum Ratings and Electrical Characteristics tables. Its analog input range of ±512mV and internal integrator design depend on symmetric rails to support true bipolar measurement and maintain linearity. Operation with only a +5V supply (and GND) is not supported - attempting it violates the −9V minimum on V− and will result in incorrect conversion, saturation, or permanent damage. The MAX132ENG+ datasheet confirms this requirement across all sections including "Power Requirements" and "Functional Description."

What external components are mandatory for basic operation of MAX132ENG+?

Four external components are mandatory for functional operation of MAX132ENG+: a 32.768kHz crystal (or external clock) connected to OSC1/OSC2; a 602kΩ metal-film integrator resistor (R_INT) between BUF OUT and INT IN; a 4.7nF integrator capacitor (C_INT) between INT IN and INT OUT; and a 0.1µF low-leakage reference capacitor (C_REF) between CREF+ and CREF−. These values are specified in the "External Components" section and validated in Figure 1 and Table 1. Omitting or substituting these components - especially with high-leakage capacitors - will degrade accuracy, increase rollover error, or prevent startup.

MAX132ENG+ Specifications

Product attributes: Attribute value

Manufacturer:: Analog Devices Inc./Maxim Integrated

Series:: -

Package/Case:: 24-DIP (0.300", 7.62mm)

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-PDIP

Mounting Type:: Through Hole

Grade:: -

Qualification:: -

MAX132ENG+ FAQ

1.How can I place an order for MAX132ENG+ through Aetrix?

Please submit a Request for Quotation (RFQ) for MAX132ENG+ 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 MAX132ENG+ reliable?

The price and inventory of MAX132ENG+ are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX132ENG+ is usually 5 days.

3.What payment methods are accepted for MAX132ENG+?

We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX132ENG+ transactions.

Note: Certain payment methods may incur a processing fee.

4.How is shipping managed for MAX132ENG+?

MAX132ENG+ orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.

Once your MAX132ENG+ 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 MAX132ENG+?

For technical support, including MAX132ENG+ datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX132ENG+ requirements.

6.How does Aetrix verify that MAX132ENG+ is sourced from the original manufacturer or authorized distributors?

All MAX132ENG+ 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 MAX132ENG+ meets industry standards.

7.What is the process for return or replacement of MAX132ENG+?

All MAX132ENG+ units undergo pre-shipment inspection (PSI). If there is an issue with MAX132ENG+, 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 MAX132ENG+ part is unused and in its original packaging.

Return procedure for MAX132ENG+:

1.Submit a request within 90 days.

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

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