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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:1,971
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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 full-scale input range (2µV/LSB), 100 conversions/sec maximum throughput, and 15µVRMS noise. It delivers ±0.006% FSR accuracy at 16 conv/sec and operates from ±5V supplies with 60µA typical supply current - ideal for high-precision battery-powered instrumentation and industrial panel meters.
For engineers reviewing the MAX132EWG+T datasheet, MAX132EWG+T pinout, MAX132EWG+T application, or MAX132EWG+T equivalent, this page provides verified technical context, validated pin functions, confirmed resolution and line-rejection performance, real-world application mappings, and two rigorously cross-checked alternative parts for precision measurement systems requiring low-noise, high-accuracy DC voltage digitization.
Technical Context
The MAX132EWG+T implements a dual-slope integration architecture with programmable 50Hz/60Hz rejection via fixed-integration timing synchronized to a 32.768kHz crystal. Its internal integrator uses external RINT (602kΩ) and CINT (4.7nF) to achieve ±512mV full-scale with 2µV/LSB resolution and ±2pA input bias current.
Digital control is handled via a 4-wire SPI-compatible serial interface (CS, SCLK, DIN, DOUT), supporting twos-complement output coding and four user-programmable digital outputs (P0–P3). Sleep mode reduces supply current to 1µA while retaining serial interface responsiveness.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | ±18-bit + sign bit - delivers 2µV/LSB quantization step over ±512mV full-scale range |
| Accuracy | ±0.006% FSR integral nonlinearity at 16 conv/sec - guarantees <±1 LSB error in calibrated systems |
| Conversion Rate | Up to 100 conv/sec - achievable with reduced accuracy (±0.012% FSR) when 50/60Hz rejection is disabled |
| Input Noise | 15µVRMS - enables stable 16-bit effective resolution without external averaging |
| Supply Current | 60µA typical (normal), 1µA (sleep) - supports >1-year battery life in portable data loggers |
| Line Rejection | 50Hz/60Hz - achieved by integer-cycle integration (655/545 clocks) using 32.768kHz crystal |
| Input Bias Current | ±2pA typical - preserves signal integrity from high-impedance transducers (e.g., strain gauges, thermistors) |
Pinout & Package
MAX132EWG+T is housed in a 24-pin wide SO (Small Outline) package, 7.5mm body width, with gull-wing leads and standard JEDEC MO-013AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-low serial interface enable; rising edge latches command register, falling edge loads output register |
| 2 (DIN) | Serial Data Input | Accepts 8-bit command packets on SCLK rising edge; controls mode, start, P0–P3, sleep, and 50/60Hz selection |
| 3 (DOUT) | Serial Data Output | Three-state output; shifts 18-bit conversion result (B18–B3) on SCLK falling edge; high-Z when CS high |
| 4 (SCLK) | Serial Clock | Master clock for synchronous serial I/O; rising edge samples DIN, falling edge outputs DOUT |
| 7 (P0), 8 (P1), 9 (P2), 10 (P3) | User-Programmable Outputs | Configurable via command register 1; drive external multiplexers, PGAs, or status indicators |
| 11 (EOC) | End-of-Conversion Flag | Active-high open-drain signal indicating completion of conversion and data readiness |
| 13 (V−), 24 (V+) | Analog Supplies | ±5V nominal dual supplies; supports ±512mV input range with 2µV/LSB resolution |
| 14 (IN HI), 15 (IN LO) | Differential Analog Inputs | Pseudo-differential inputs with ±2pA bias; accept ±512mV full-scale across 14–15 with AGND reference |
| 16 (AGND), 12 (DGND) | Analog/Digital Grounds | Separate ground returns minimize digital switching noise coupling into analog path |
| 17 (REF−), 18 (REF+) | Differential Reference Inputs | Accept 545mV (60Hz) or 655mV (50Hz) reference; set full-scale input range and rollover error |
| 19 (CREF+), 20 (CREF−) | Reference Capacitor Terminals | Connect 0.1µF low-leakage capacitor (e.g., polypropylene) to stabilize reference during deintegration |
| 21 (INT IN), 22 (INT OUT) | Integrator Interface | External integrator node; connect 602kΩ resistor and 4.7nF capacitor between INT IN and INT OUT |
| 23 (BUF OUT) | Buffer Amplifier Output | Drives integrator resistor; connects to RINT to minimize noise injection into integrator node |
| 5 (OSC1), 6 (OSC2) | Crystal Oscillator Terminals | Drive 32.768kHz crystal; define conversion timing and 50/60Hz rejection capability |
Key Features
| Feature | Design Value |
|---|---|
| Multi-slope integration architecture | Enables 18-bit resolution with <15µVRMS noise and guaranteed 50/60Hz line rejection without external filtering |
| Programmable 50Hz/60Hz rejection | Configured via single bit; sets integration period to exact 20ms (50Hz) or 16.67ms (60Hz) using 32.768kHz clock |
| Four user-programmable digital outputs | P0–P3 controlled via serial command register; eliminate need for external GPIO expanders in sensor-mux designs |
| Sleep mode with serial interface active | Reduces supply current to 1µA while preserving CS/DIN/SCLK/DOUT functionality for wake-on-command operation |
| Twos-complement serial output coding | Simplifies bipolar measurement processing in microcontrollers; eliminates software sign-extension logic |
| ±2pA input bias current | Preserves accuracy when digitizing signals from high-impedance sources such as load cells and RTDs |
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 18-bit resolution and 50Hz line rejection. Use Value: 1µA sleep current extends battery life beyond 2 years; ±2pA input bias prevents drift in high-Z sensor bridges. |
Use Scenario: Portable handheld multimeter with autoranging and true RMS capability. IC Role / Device Role / Timing Role: High-accuracy DC voltage digitizer with programmable gain control via P0–P3 outputs driving external PGA. Use Value: ±0.006% FSR accuracy ensures Class 0.01 meter compliance; serial interface minimizes MCU pin count. |
| Industrial Process Control | Transducer-Signal Measurement |
Use Scenario: PLC analog input module acquiring 4–20mA loop signals from flow and temperature transmitters. IC Role / Device Role / Timing Role: Isolated front-end ADC converting conditioned current-loop voltages with integrated line-frequency rejection. Use Value: 50/60Hz rejection eliminates need for external notch filters; separate AGND/DGND pins reduce ground-loop errors. |
Use Scenario: Precision weigh scale using strain-gauge bridge with 100mV/V sensitivity. IC Role / Device Role / Timing Role: Low-noise, high-resolution ADC interfacing directly to bridge amplifier output with read-zero calibration. Use Value: 15µVRMS noise enables 1:100,000 dynamic range; read-zero bit allows on-demand offset compensation. |
Equivalent & Alternatives
The following parts are listed as comparable options for similar high-accuracy integrating ADC applications.
| Alternative Part | Technical Difference | Application Difference | Selection Advice |
|---|---|---|---|
| ADS1258IRHBT | 24-bit delta-sigma ADC; 130kSPS max; no built-in 50/60Hz rejection; requires external digital filter configuration | Higher resolution but lacks hardware-based line rejection; needs FPGA or MCU firmware for notch filtering | Choose for higher speed and resolution where line rejection can be implemented digitally |
| LTC2440CGN#PBF | 24-bit delta-sigma ADC; 100SPS; integrated 50/60Hz rejection; 350nVRMS noise; SPI interface | Superior noise performance and auto-zeroing; wider supply range (2.7–5.5V); no dual-supply requirement | Choose for single-supply systems needing lower noise and simpler power design |
Compared with MAX132EWG+T, ADS1258IRHBT offers higher speed and resolution but shifts line-rejection burden to system firmware, while LTC2440CGN#PBF provides better noise and single-supply operation but lacks user-programmable outputs (P0–P3) for peripheral control.
Availability
MAX132EWG+T is available at Aetrix Electronics and suitable for remote data acquisition, battery-powered instruments, and industrial process control applications requiring stable component supply, long-lifecycle support, and guaranteed parametric performance across extended temperature ranges.
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) is a semiconductor company specializing in 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, designed specifically for low-power, high-stability DC measurement systems where line-frequency interference must be rejected without external filtering or complex digital processing.
FAQ
What is the full-scale input voltage range supported by the MAX132EWG+T?
The MAX132EWG+T supports a ±512mV full-scale differential input range across pins IN HI (14) and IN LO (15), delivering 2µV/LSB resolution at 18 bits. This range is guaranteed with 545mV reference voltage in 60Hz mode or 655mV in 50Hz mode. Operation outside ±470mV to ±660mV may degrade linearity per the datasheet's common-mode error curves.
How does the MAX132EWG+T achieve 50Hz and 60Hz line rejection?
The MAX132EWG+T achieves hardware-based 50Hz/60Hz rejection by configuring its integration time to exactly one AC line cycle: 20ms for 50Hz (655 clock counts) or 16.67ms for 60Hz (545 clock counts), synchronized to a 32.768kHz crystal. This is controlled by a dedicated bit in command register 0 and requires no external filtering or digital post-processing.
Can the MAX132EWG+T operate from a single supply?
No - the MAX132EWG+T requires dual analog supplies: V+ = +5V and V− = −5V, as specified in Absolute Maximum Ratings and Electrical Characteristics. Its ±512mV input range, integrator topology, and internal reference architecture depend on symmetric dual-rail operation. Single-supply alternatives like LTC2440CGN#PBF exist but are not pin- or functionally compatible.
What are the recommended external components for the MAX132EWG+T?
The MAX132EWG+T requires: a 32.768kHz crystal between OSC1/OSC2; 602kΩ metal-film integrator resistor (RINT) between BUF OUT and INT IN; 4.7nF polypropylene integrator capacitor (CINT) between INT IN and INT OUT; and 0.1µF low-leakage polypropylene reference capacitor (CREF) between CREF+ and CREF−. These values are validated for 16 conv/sec with 50/60Hz rejection.
Does the MAX132EWG+T include an internal oscillator or require an external crystal?
The MAX132EWG+T requires an external 32.768kHz crystal connected between OSC1 (pin 5) and OSC2 (pin 6) for precise timing and guaranteed 50/60Hz rejection. While it supports external clock input (to OSC1 only), the crystal configuration is mandatory for production use - the internal oscillator has no standalone mode and cannot generate accurate line-rejection timing without external frequency reference.
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:
- 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+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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