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Analog Devices Inc./Maxim Integrated MAX132EWG-T
- Part No.:
- MAX132EWG-T
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Category:
- Analog to Digital Converters (ADC)
- Package:
- 24-SOIC (0.295", 7.50mm Width)
- Datasheet:
-
MAX132EWG-T.pdf
- Description:
- IC ADC 18BIT MULTI-SLOPE 24SOIC
- Quantity:
- Payment:
- Shipping:
Inventory:2,997
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Product details
Overview
MAX132EWG-T from Maxim Integrated is an 18-bit plus sign, multi-slope integrating analog-to-digital converter (ADC) with serial interface, ±512mV input range (2µV/LSB), 100 conversions/sec max throughput, and 15µVRMS noise. It operates from ±5V supplies, draws 60µA typical supply current, and supports 50Hz/60Hz line rejection for precision transducer-signal measurement in industrial process control systems.
For engineers reviewing the MAX132EWG-T datasheet, MAX132EWG-T pinout, MAX132EWG-T application, or MAX132EWG-T equivalent, this page delivers verified technical context, real-world design meaning of key specs, validated pin functions, confirmed alternatives, and supply support for embedded instrumentation and battery-powered data acquisition.
Technical Context
The MAX132EWG-T uses multi-slope integration architecture with fixed-integration time followed by deintegration of a known reference voltage, enabling high resolution without sacrificing speed. Its 50Hz/60Hz mode selection bit configures integration periods to exactly one AC line cycle (20ms or 16.67ms) using a 32.768kHz crystal, achieving guaranteed ±0.006% FSR accuracy at 16 conv/sec.
Dual differential reference inputs (REF+, REF−) and dedicated CREF+ / CREF− terminals enable precise rollover error control; integrator inputs (INT IN / INT OUT) require external RINT = 602kΩ and CINT = 4.7nF for nominal operation. Four user-programmable digital outputs (P0–P3) are serially controlled and usable for multiplexer or PGA sequencing.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | ±18-bit + sign (262,144 counts), delivering 2µV/LSB at ±512mV full-scale input range |
| Accuracy | ±0.006% FSR integral nonlinearity at 16 conv/sec - ensures <±32ppm error in weigh-scale or panel-meter calibration |
| Conversion Rate | Up to 100 conv/sec (reduced accuracy); 16 conv/sec guaranteed with 50Hz/60Hz rejection enabled |
| Input Range | ±512mV pseudo-differential across IN HI/IN LO - compatible with low-level sensor outputs without gain stage |
| Supply Current | 60µA typical active; 1µA sleep-mode - enables >1-year battery life in remote data loggers |
| Input Leakage | ±2pA max at +25°C - preserves signal integrity from high-impedance sources like thermocouples or strain gauges |
| Reference Rejection | 50Hz/60Hz rejection via programmable integration timing - eliminates need for external notch filters in noisy industrial environments |
Pinout & Package
The MAX132EWG-T is housed in a 24-pin wide SO (Small Outline) package, 7.5mm body width, gull-wing leads, RoHS-compliant, rated for −40°C to +85°C operation.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| IN HI / IN LO | Pseudo-differential analog input | Accepts ±512mV input; high-impedance CMOS inputs enable direct connection to sensors without loading |
| REF+ / REF− | Differential reference voltage inputs | Set full-scale range; REF− tied to AGND minimizes rollover error; supports 500–700mV reference voltages |
| CREF+ / CREF− | Reference capacitor terminals | Connect 0.1µF low-leakage capacitor (e.g., polypropylene) to stabilize reference during deintegration phase |
| INT IN / INT OUT | Integrator node connections | External 602kΩ resistor and 4.7nF capacitor form integrator; INT OUT drives capacitor outer foil to reduce noise |
| SCLK / DIN / DOUT / CS | 4-wire serial interface | CMOS-compatible; D7-first MSB-serial protocol; CS rising edge latches commands, falling edge loads output data |
| P0–P3 | User-programmable digital outputs | Configured via serial port; used to control external multiplexers, PGAs, or status indicators without MCU GPIO overhead |
| EOC | End-of-conversion flag | Active-high open-drain output signals conversion completion; used for interrupt-driven or polled data capture |
| V+ / V− / AGND / DGND | Power and ground rails | Separate analog/digital grounds required; ±5V nominal supplies; V− must be ≤ −4.5V for specified performance |
Key Features
| Feature | Design Value |
|---|---|
| Multi-slope integration architecture | Enables 18-bit resolution with faster conversion than dual-slope ADCs - achieves 100 conv/sec while maintaining low noise |
| Programmable 50Hz/60Hz rejection | Integration period auto-adjusts to 655 or 545 clock cycles (32.768kHz) - eliminates 50/60Hz interference without external filtering components |
| Four serially controlled digital outputs | P0–P3 pins eliminate need for external I/O expanders when sequencing multi-channel sensor arrays or gain stages |
| Twos-complement serial output coding | Simplifies bipolar measurement processing in microcontrollers - no software sign-extension or offset correction required |
| Low-power sleep mode | 1µA quiescent current with oscillator disabled - ideal for intermittent-read applications like environmental monitoring nodes |
Applications
| Remote Data Acquisition | Battery-Powered Instruments |
|---|---|
Use Scenario: Long-term environmental monitoring using solar-charged batteries and wireless telemetry. IC Role / Device Role / Timing Role: Precision ADC digitizing thermistor, RTD, and pressure sensor outputs with minimal power draw between readings. Use Value: 1µA sleep current and ±2pA input leakage preserve battery life and sensor signal fidelity over multi-year deployments. | Use Scenario: Portable handheld multimeter with autoranging and 6½-digit display capability. IC Role / Device Role / Timing Role: Core 18-bit ADC performing high-resolution DC voltage, current, and resistance measurements. Use Value: ±0.006% FSR accuracy and 15µVRMS noise ensure metrology-grade readings without external calibration hardware. |
| Industrial Process Control | Transducer-Signal Measurement |
Use Scenario: PLC analog input module acquiring 4–20mA loop signals from flow, level, and temperature transmitters. IC Role / Device Role / Timing Role: Isolated front-end ADC converting conditioned transducer outputs with high common-mode rejection. Use Value: 50Hz/60Hz rejection and ±0.25% CMRR suppress noise from motor drives and variable-frequency inverters. | Use Scenario: Strain-gauge-based load cell interface in commercial weighing systems. IC Role / Device Role / Timing Role: High-resolution ADC capturing microvolt-level bridge outputs with integrated zero-calibration (Read-Zero bit). Use Value: Read-Zero function enables on-command offset nulling - critical for drift compensation during thermal cycling. |
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 |
|---|---|---|---|
| ADS1258IDBT | 24-bit delta-sigma ADC; SPI interface; 30kSPS max; requires external reference and clock | Higher resolution but lacks built-in 50/60Hz rejection; needs more external components for same noise immunity | Choose ADS1258IDBT for higher throughput or when system already includes precision reference and clock sources |
| LTC2440CGN#PBF | 24-bit delta-sigma ADC; 7.5SPS typ; internal oscillator; 100dB 50/60Hz rejection; no programmable outputs | Slower but simpler integration; no P0–P3 control pins; lower supply current (350nA sleep) | Choose LTC2440CGN#PBF for ultra-low-power, single-channel applications where digital output control is unnecessary |
Compared with ADS1258IDBT and LTC2440CGN#PBF, the MAX132EWG-T uniquely combines 18-bit resolution, 100 conv/sec speed, integrated 50/60Hz rejection, and four programmable outputs in a single 24-pin SO package - making it optimal for compact, self-contained industrial data loggers requiring both precision and peripheral control.
Availability
MAX132EWG-T is available at Aetrix Electronics and suitable for industrial process control, battery-powered instrumentation, and remote data acquisition requiring stable component supply across extended temperature ranges (−40°C to +85°C).
Supply support for MAX132EWG-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) designs precision analog, mixed-signal, and power-management ICs for industrial, medical, and communications applications.
The MAX132EWG-T belongs to Maxim's high-accuracy integrating ADC product line, engineered specifically for low-noise, low-power, line-rejected measurement of low-level transducer signals in harsh electrical environments.
FAQ
What is the guaranteed accuracy specification for the MAX132EWG-T at its rated conversion rate?
The MAX132EWG-T is guaranteed for ±0.006% FSR integral nonlinearity at 16 conversions per second under standard operating conditions (V+ = 5V, V− = −5V, fCLK = 32.768kHz, 60Hz mode). This corresponds to ±15.7ppm error over full scale and is tested across the −40°C to +85°C temperature range. Accuracy degrades to approximately ±0.012% FSR when operated at 100 conv/sec.
Does the MAX132EWG-T require external passive components to operate, and if so, which ones?
Yes, the MAX132EWG-T requires four external passive components: a 602kΩ metal-film integrator resistor (RINT), a 4.7nF integrator capacitor (CINT), a 0.1µF low-leakage reference capacitor (CREF), and a 32.768kHz crystal (or external clock source). These are mandatory for proper multi-slope integration, reference stability, and oscillator operation - no internal equivalents are provided.
How does the MAX132EWG-T achieve 50Hz and 60Hz line frequency rejection?
The MAX132EWG-T achieves 50Hz/60Hz rejection by configuring its integration period to exactly one AC line cycle: 20ms for 50Hz (655 clock counts) or 16.67ms for 60Hz (545 clock counts), using a 32.768kHz crystal. This is controlled by the 50Hz/60Hz mode bit in Command Input Register 0. The architecture inherently averages out interference over the full cycle, eliminating need for external notch filters.
Can the MAX132EWG-T operate from a single supply, or does it require dual supplies?
The MAX132EWG-T requires dual supplies: a positive supply (V+) and a negative supply (V−). The datasheet specifies V+ = +4.5V to +5.5V and V− = −5.5V to −4.5V, with absolute maximum ratings up to +6V and −9V respectively. Single-supply operation is not supported - the analog input range (±512mV) and internal integrator topology depend on true bipolar rail capability.
What is the function of the P0–P3 pins on the MAX132EWG-T, and how are they configured?
The P0–P3 pins on the MAX132EWG-T are user-programmable digital outputs controlled exclusively via Command Input Register 1. Bits D4–D7 of that register set the logic state of P0–P3 respectively. They are designed to drive external devices such as analog multiplexers or programmable-gain amplifiers, reducing MCU GPIO usage. Configuration occurs through the same 4-wire serial interface used for data readback.
MAX132EWG-T Specifications
- Product attributes
- Attribute value
- Manufacturer:
- Analog Devices Inc./Maxim Integrated
- Series:
- -
- Package/Case:
- 24-SOIC (0.295", 7.50mm Width)
- Packaging:
- Tape & Reel (TR)
- Product Status:
- Obsolete
- 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-T FAQ
1.How can I place an order for MAX132EWG-T through Aetrix?
Please submit a Request for Quotation (RFQ) for MAX132EWG-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 MAX132EWG-T reliable?
The price and inventory of MAX132EWG-T are updated periodically and may fluctuate due to market conditions. Stock and pricing data are typically refreshed every 24 hours. Quotation validity for MAX132EWG-T is usually 5 days.
3.What payment methods are accepted for MAX132EWG-T?
We accept Wire Transfer, PayPal, Credit Card, Western Union, MoneyGram, and Escrow for MAX132EWG-T transactions.
Note: Certain payment methods may incur a processing fee.
4.How is shipping managed for MAX132EWG-T?
MAX132EWG-T orders can be shipped via leading logistics carriers, including DHL, UPS, FedEx, TNT, or Registered Mail.
Once your MAX132EWG-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 MAX132EWG-T?
For technical support, including MAX132EWG-T datasheets, pinout diagrams, or application guidance, please contact our engineering support team. They can provide detailed documentation and assistance for your MAX132EWG-T requirements.
6.How does Aetrix verify that MAX132EWG-T is sourced from the original manufacturer or authorized distributors?
All MAX132EWG-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 MAX132EWG-T meets industry standards.
7.What is the process for return or replacement of MAX132EWG-T?
All MAX132EWG-T units undergo pre-shipment inspection (PSI). If there is an issue with MAX132EWG-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 MAX132EWG-T part is unused and in its original packaging.
Return procedure for MAX132EWG-T:
1.Submit a request within 90 days.
2.Obtain a Return Material Authorization (RMA) from Aetrix.
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