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Analog Devices Inc./Maxim Integrated MAX132EWG
- 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:
- Payment:
- Shipping:
Inventory:2,164
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Product details
Overview
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 1µA sleep-mode current. It delivers ±0.006% FSR integral nonlinearity at 16 conv/sec and supports 50Hz/60Hz line rejection for precision transducer-signal measurement in industrial process control systems.
For engineers reviewing the MAX132EWG datasheet, MAX132EWG pinout, MAX132EWG application, or MAX132EWG equivalent, this page provides verified technical context, validated pin functions, confirmed resolution and noise performance, real-world application mappings, and two rigorously cross-checked alternative parts for weigh-scale and battery-powered data-acquisition designs.
Technical Context
The MAX132EWG implements a dual-integration architecture: fixed-time input integration followed by reference deintegration, enabling high-resolution conversion without external calibration. Its 32.768kHz crystal-driven oscillator sets integration time to exactly one 50Hz (655 counts) or 60Hz (545 counts) cycle, delivering guaranteed 50Hz/60Hz rejection.
It uses a 4-wire serial interface (CS, SCLK, DIN, DOUT) with twos-complement output coding and four user-programmable digital outputs (P0–P3) for external multiplexer or PGA control. Input leakage is ±2pA typical, common-mode rejection exceeds ±3.1% FSR, and zero-error drift is specified over –40°C to +85°C.
Key Specifications
| Parameter | Value and Actual Design Meaning |
|---|---|
| Resolution | ±18-bit plus sign - delivers 2µV/LSB quantization step over ±512mV full scale. |
| Conversion Rate | 16 conv/sec guaranteed accuracy; up to 100 conv/sec with reduced linearity (±0.012% FSR). |
| RMS Noise | 15µV - enables stable readings in low-noise industrial sensor interfaces. |
| Supply Current | 60µA normal operation; 1µA sleep mode - suitable for battery-powered instruments. |
| Input Leakage | ±2pA typical - preserves signal integrity from high-impedance transducers like strain gauges. |
| Line Rejection | 50Hz/60Hz rejection via programmable integration timing - eliminates mains-induced offset in panel meters. |
| Accuracy | ±0.006% FSR integral nonlinearity at 16 conv/sec - meets Class I weigh-scale requirements. |
Pinout & Package
The MAX132EWG is housed in a 24-pin wide SO (Small Outline) package, RoHS-compliant, with 0.300-inch body width and standard JEDEC MS-013AC footprint.
| Pin/Terminal | Circuit Role | Design Meaning |
|---|---|---|
| 1 (CS) | Chip Select | Active-low serial interface enable; rising edge latches command data, falling edge loads output register. |
| 2 (DIN) | Serial Data Input | Accepts 8-bit command packets on SCLK rising edge; controls register selection and P0–P3 states. |
| 3 (DOUT) | Serial Data Output | Three-state output; shifts 18-bit twos-complement result LSB-first on SCLK falling edge. |
| 4 (SCLK) | Serial Clock | Drives synchronous data transfer; rising edge clocks DIN, falling edge clocks DOUT. |
| 7 (P0), 8 (P1), 9 (P2), 10 (P3) | User-Programmable Outputs | Configurable via serial port to control external MUX or PGA - no additional GPIO required. |
| 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 ±4.5V to ±5.5V operating range with rail-to-rail input capability. |
| 14 (IN HI), 15 (IN LO) | Differential Analog Inputs | Pseudo-differential inputs accepting ±512mV full-scale swing; high-Z CMOS gates minimize loading. |
| 17 (REF−), 18 (REF+) | Differential Reference Inputs | Accept 545mV (60Hz) or 655mV (50Hz) reference voltage; CREF+ and CREF− pins stabilize reference charge. |
| 21 (INT IN), 22 (INT OUT) | Integrator Interface | Connect external RINT (602kΩ) and CINT (4.7nF); INT OUT drives capacitor outer foil to reduce noise. |
| 23 (BUF OUT) | Buffer Amplifier Output | Drives integrator resistor; optimized for low distortion and minimal offset drift. |
Key Features
| Feature | Design Value |
|---|---|
| Multi-slope integration architecture | Enables 18-bit resolution with single-chip implementation and no external calibration components. |
| Programmable 50Hz/60Hz rejection | Eliminates need for external notch filters in AC-coupled industrial environments. |
| Four serially controlled digital outputs | Reduces system component count by replacing discrete logic or microcontroller GPIO for MUX/PGA sequencing. |
| 1µA sleep-mode current | Extends battery life in portable data loggers beyond 5 years with periodic wake-up sampling. |
| ±2pA input bias current | Maintains accuracy when interfacing directly to high-Z sensors such as piezoresistive pressure elements. |
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, RTD, and humidity sensor outputs with integrated line-rejection and ultra-low power management. Use Value: 1µA sleep current and 16 conv/sec throughput enable >3-year deployment without maintenance while rejecting 50Hz grid interference. |
Use Scenario: Handheld multimeter with auto-ranging, true RMS, and data logging to internal flash memory. IC Role / Device Role / Timing Role: High-accuracy front-end ADC acquiring DC voltage, current, and resistance measurements with programmable gain control via P0–P3. Use Value: ±0.006% FSR INL and ±2pA input current ensure Class II accuracy without external zero-calibration circuitry. |
| Industrial Process Control | Transducer-Signal Measurement |
Use Scenario: PLC analog input module measuring 4–20mA loop signals across multiple channels with cold-junction compensation. IC Role / Device Role / Timing Role: Precision ADC performing synchronized conversions across distributed sensor nodes with deterministic 16 conv/sec timing. Use Value: Guaranteed 50Hz/60Hz rejection and ±512mV input range match standard industrial transducer output spans without scaling amplifiers. |
Use Scenario: Load-cell-based weigh scale requiring sub-gram resolution under varying ambient temperature and EMI conditions. IC Role / Device Role / Timing Role: Core ADC executing read-zero calibration before each weight measurement to cancel thermal drift and common-mode offset. Use Value: Built-in read-zero bit and ±0.006% FSR accuracy eliminate need for external zero-offset DAC or trimming resistors. |
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; requires external reference and clock; no built-in 50/60Hz rejection logic. | Higher resolution but lacks integrated line-rejection - demands external digital filtering or firmware compensation. | Choose for higher speed and resolution where board space allows external support components and software overhead. |
| LTC2440CGN#PBF | 24-bit delta-sigma ADC; 10SPS typ; integrated oscillator; 50/60Hz rejection via internal digital filter; 3.3V single supply. | Lower power (350µA active) and simpler supply scheme, but slower and incompatible pinout/package. | Prefer for new 3.3V designs prioritizing ease of use and lowest possible BOM count over conversion rate. |
Compared with MAX132EWG, ADS1258IRHBT offers greater resolution and speed but increases system complexity with external timing and filtering, while LTC2440CGN#PBF simplifies power design and embeds rejection digitally but sacrifices throughput and cannot replace MAX132EWG without PCB redesign.
Availability
MAX132EWG 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 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 automotive applications.
The MAX132EWG belongs to Maxim's high-accuracy integrating ADC product line, engineered specifically for low-noise, low-power, line-rejected measurements in weigh scales, panel meters, and data loggers.
FAQ
What is the guaranteed accuracy specification for MAX132EWG at its rated conversion rate?
The MAX132EWG guarantees ±0.006% FSR integral nonlinearity at 16 conversions per second, tested and specified over the full –40°C to +85°C operating temperature range. This accuracy level is achieved using the internal 50Hz or 60Hz rejection mode with a 32.768kHz crystal, and applies to the ±512mV full-scale input range. The MAX132EWG datasheet confirms this value under "Electrical Characteristics" with Note 2 defining it as maximum deviation from best straight-line fit.
Does MAX132EWG support both 50Hz and 60Hz line-frequency rejection, and how is it configured?
Yes, MAX132EWG supports both 50Hz and 60Hz line-frequency rejection via a dedicated bit (D6) in Command Input Register 0. When set to 0, integration time is set to 545 clock cycles for 60Hz rejection; when set to 1, it is 655 cycles for 50Hz rejection - both synchronized to a 32.768kHz crystal. This configuration is performed through the serial interface and does not require external hardware changes. The MAX132EWG functional description explicitly states that this feature achieves "good line rejection" by matching integration time to one complete line cycle.
What are the supply voltage requirements for MAX132EWG, and is single-supply operation possible?
MAX132EWG requires dual analog supplies: V+ = +4.5V to +5.5V and V− = –4.5V to –5.5V, with absolute maximum ratings of +6.0V and –9.0V respectively. Single-supply operation is not supported - the architecture relies on symmetric bipolar rails to accommodate ±512mV differential input and internal integrator swing. The datasheet specifies DGND = AGND = IN LO = REF− = 0V as the reference point, confirming mandatory dual-rail operation. Operating outside these ranges risks permanent damage or undefined behavior.
How does the read-zero function work in MAX132EWG, and when should it be used?
The read-zero function in MAX132EWG is activated by setting the read-zero bit (D4 in Command Input Register 0) to 1, which internally shorts IN HI to IN LO before conversion. This captures system offset including amplifier drift and reference errors. The resulting value must be subtracted from subsequent measurements. It is recommended before each critical measurement, after ambient temperature shifts >5°C, or when reference voltage or common-mode voltage changes significantly. The MAX132EWG datasheet states that "averaging 2 or 3 read-zero measurements provides the most accurate read-zero value," and notes periodic recalibration improves long-term stability.
What external components are mandatory for basic operation of MAX132EWG?
Four external components are mandatory for basic operation of MAX132EWG: a 32.768kHz crystal (or external clock) connected to OSC1/OSC2; a 602kΩ metal-film integrator resistor (RINT) between BUF OUT and INT IN; a 4.7nF integrator capacitor (CINT) between INT IN and INT OUT; and a 0.1µF reference capacitor (CREF) between CREF+ and CREF−. These values are specified in the "Electrical Characteristics" table and "Analog Design Procedure" section of the MAX132EWG datasheet for guaranteed 16 conv/sec operation with 50/60Hz rejection.
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:
- 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 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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