MAX132CWG+C10203 - 18-Bit+Sign Multi-Slope ADC | Analog Devices
MPN: MAX132CWG+C10203 ✓ Active| Qty | Unit Price | Extended |
|---|---|---|
| 1 | $17.5 | $17.50 |
| 10 | $15.8 | $158.00 |
| 100 | $14.2 | $1,420.00 |
| 500 | $12.85 | $6,425.00 |
| 1,000 | $11.4 | $11,400.00 |
MAX132CWG+C10203 Overview
Background: an analog-to-digital converter (ADC) translates continuous analog waveforms into discrete digital codes. Integrating ADCs such as the dual-slope and multi-slope families average input noise over a fixed integration window, naturally rejecting 50 Hz / 60 Hz mains interference. Multi-slope integration is a refined variant that adds auxiliary run-up and run-down phases to reduce conversion time while preserving the inherent noise-rejection characteristics of dual-slope designs. The MAX132 family sits in the precision slow-speed ADC segment of the data-converter hierarchy: ADC -> data converter -> signal-chain IC -> semiconductor.
Key features of the MAX132CWG+C10203 include: 18-bit + sign resolution with 2 µV/LSB scaling, ±512 mV true bipolar input range, 100 SPS conversion rate, simple 4-wire (clock, data, CS, RDY) synchronous serial interface, ±5 V analog supply operation, low conversion noise, on-chip oscillator, and integrated digital filtering. The wide 24-pin SO footprint gives generous analog/digital isolation on the integrated PCB, and the +C10203 suffix denotes factory programming of the calibration constants for the specific lot.
Typical applications include precision weigh scales, industrial data loggers, panel meters, temperature measurement systems, and bench-top digital multimeters. Because the MAX132 natively rejects line-frequency noise and provides ±18-bit resolution over the ground, it is the classic fit for load-cell signal chains and process-control front ends.
Design consideration: the MAX132 requires external integration capacitors, reference capacitors, and a clock source as documented in the Maxim datasheet. Decouple AVDD and DVDD with 10 µF / 0.1 µF pairs near the IC and route the analog input traces differentially to preserve CMRR at the 2 µV/LSB level.
Unique value: this page consolidates Analog Devices and Maxim distributor pricing, drop-in same-package alternatives (MAX132 family tape-and-reel variants), and practical weigh-scale design notes not duplicated in the merged datasheet.
Drop-in alternatives for MAX132CWG+C10203 — same package, pin-to-pin compatible. Different-package parts requiring PCB rework are excluded.
Quick Comparison Tool — Select alternative parts for side-by-side comparison:
MAX132CWG+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX132CWG+T
✅ Drop-In📋 Reference alternative (not in catalog)
MAX132CWG+TGA7
✅ Drop-In📋 Reference alternative (not in catalog)
MAX132EWE+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX132CWE+
✅ Drop-In📋 Reference alternative (not in catalog)
MAX132CWG+C10203 Maximum Ratings & Electrical Characteristics
| Resolution | 18 bit + sign (±18-bit equivalent) |
| Conversion Architecture | Multi-slope integrating |
| Conversion Rate | 100 SPS (max) |
| Input Channels | 1 differential |
| Full-Scale Input Range | ±512 mV (2 µV/LSB) |
| Output Interface | 4-wire synchronous serial |
| Analog Supply Voltage | ±5 V (dual supply) |
| Digital Supply Voltage | +5 V |
| Conversion Noise | Low (integrating architecture) |
| Operating Temperature Range | 0 °C to +70 °C (commercial) |
| Package Type | 24-pin SOIC (wide-body / WSOIC) |
| Mounting Type | Surface Mount |
| Input Common-Mode Range | Within AVDD rails (per datasheet) |
| On-Chip Reference | No (requires external reference) |
| Calibration | Factory-trimmed (C10203 suffix denotes calibration code) |
MAX132CWG+C10203 Pin Configuration
| Pin 1 | INHI — Positive differential analog input |
| Pin 2 | INLO — Negative differential analog input |
| Pin 3 | CREF+ — Reference capacitor positive terminal |
| Pin 4 | CREF- — Reference capacitor negative terminal |
| Pin 5 | INT+ — Integration capacitor positive terminal |
| Pin 6 | INT- — Integration capacitor negative terminal |
| Pin 7 | AVDD+ — Positive analog supply (+5 V nominal) |
| Pin 8 | AVDD- — Negative analog supply (-5 V nominal) |
| Pin 9 | REF — External voltage reference input |
| Pin 10 | BUF — Buffer amplifier output for integration cap |
| Pin 11 | ANA_GND — Analog ground |
| Pin 12 | DGND — Digital ground |
| Pin 13 | DVDD — Digital supply (+5 V) |
| Pin 14 | CS — Chip-select (active low) for serial interface |
| Pin 15 | SCLK — Serial clock input |
| Pin 16 | DOUT — Serial data output |
| Pin 17 | RDY — End-of-conversion (active low) |
| Pin 18 | OSC — Oscillator pin (external capacitor to set clock) |
| Pin 19 | CAL — Calibration mode select |
| Pin 20 | TEST — Factory test pin (leave floating per datasheet) |
| Pin 21 | NC — Not connected (per datasheet) |
| Pin 22 | NC — Not connected (per datasheet) |
| Pin 23 | NC — Not connected (per datasheet) |
| Pin 24 | NC — Not connected (per datasheet) |
Typical Applications
MAX132CWG+C10203 is suitable for 6 applications: Precision Weigh Scales, Industrial Data Loggers, Digital Panel Meters, Process Control Front Ends, Bench-Top Digital Multimeters, Temperature Measurement Bridges.
Precision Weigh Scales
The MAX132CWG+C10203 is purpose-built for precision weigh-scale signal chains. Its multi-slope integrating architecture delivers ±18-bit effective resolution at 100 SPS over a true ±512 mV bipolar input - the natural fit for a 4-wire load-cell bridge excited at 5 V with 2 mV/V output. The 2 µV/LSB code width resolves sub-gram weight changes, while the integrating conversion window inherently rejects 50 Hz/60 Hz mains pickup that dominates industrial shop-floor environments. Placed directly at the load-cell differential output with proper guarding, it produces a clean digital code with no external PGA. Unlike sigma-delta alternatives, it requires no digital filter configuration, simplifying firmware. Pair with the MAX6325 voltage reference and the MAX4475 low-noise op-amp for a complete weigh-scale front end.
Recommended
Industrial Data Loggers
For multi-channel industrial data loggers, the MAX132CWG+C10203 provides 18-bit-plus-sign resolution with 4-wire serial interface that multiplexes easily with external analog switches. At 100 SPS, it can sample 8-16 channels sequentially through a CD4067 mux with 1-2 SPS per channel, suitable for temperature, pressure, and flow logging. The integrating topology rejects mains-borne noise on long industrial cable runs - critical for factory-floor installations where 480 V three-phase inverters pollute signal lines. The wide ±512 mV bipolar input accepts both thermocouple-mV outputs and 4-20 mA shunts with no extra signal conditioning. Its commercial 0/+70 °C temperature grade matches most indoor industrial enclosures.
Recommended
Digital Panel Meters
Digital panel meters for industrial front panels are a textbook MAX132 application. The MAX132CWG+C10203 drives a multiplexed 7-segment or LCD readout through the 4-wire synchronous serial port, with the RDY-bar pin signaling end-of-conversion to the display controller. Its ±18-bit resolution over ±512 mV input makes it ideal for 3.5-digit (1999 count) or 4.5-digit (19999 count) panel meters that must resolve microvolt-level process signals. The integrating conversion inherently averages display-update flicker caused by mains noise. Pair with a MAX7219 7-segment driver for the LED display and a MAX232 for isolated RS-232 readout.
Recommended
Process Control Front Ends
In PLC and DCS analog input modules, the MAX132CWG+C10203 provides the precision, multi-slope conversion needed for process variables such as pH, conductivity, and strain. The ±512 mV true bipolar input directly digitizes pH-electrode mV outputs and load-cell strain-gauge bridges with no AC excitation. At 100 SPS with integrating noise rejection, it tolerates the electrically noisy 24 V loop-powered environments typical of process plants. The 4-wire serial interface allows multiple ADCs to share an SPI bus through individual CS-bar chip-selects, scaling to 16-bit / 32-bit analog input density per rack-mount card.
Recommended
Bench-Top Digital Multimeters
Bench-top 6.5-digit and 7.5-digit DMMs historically rely on multi-slope ADCs such as the MAX132 family. The MAX132CWG+C10203 provides the resolution, the bipolar input, and the integrating noise rejection required for accurate DC voltage and resistance measurements on the calibration lab bench. With proper input attenuation and a precision DC reference, it resolves microvolt-level DC signals even in the presence of USB and line-frequency interference. The 4-wire serial interface allows the meter controller to issue integration-start, calibration, and readback commands through a simple SPI bus.
Recommended
Temperature Measurement Bridges
Precision temperature-measurement systems using platinum RTDs or thermistor bridges benefit from the MAX132CWG+C10203's ±512 mV bipolar input and 100 SPS integrating conversion. An RTD bridge excited at 5 V produces a few mV of differential signal over the 0-500 °C range - exactly matched to the ADC's 2 µV/LSB code resolution. The integrating conversion window averages thermal-EMF noise generated by thermocouple effects at PCB junctions, accounting for more repeatable temperature readings than successive-approximation ADCs in the same role. Pair with a MAX31865 RTD-to-digital companion for digital-output redundancy.
Recommended
Recommended Products Summary
Engineering reference data for MAX132CWG+C10203 — comparison, design guidance, and compliance information.
Selection Guide
Comparison with Alternatives
| Parameter | This Product | MAX132CWG+ | MAX132CWG+T | MAX132CWG+TGA7 | MAX132EWE+ | MAX132CWE+ |
|---|---|---|---|---|---|---|
| Package | 24-pin WSOIC | 24-pin WSOIC - same | 24-pin WSOIC - same | 24-pin WSOIC - same | 24-pin WSOIC - same | 24-pin WSOIC - same |
| Brand | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices | Analog Devices |
| Resolution | 18-bit + sign | 18-bit + sign - same | 18-bit + sign - same | 18-bit + sign - same | 18-bit + sign - same | 18-bit + sign - same |
| Conversion Rate | 100 SPS | 100 SPS | 100 SPS | 100 SPS | 100 SPS | 100 SPS |
| Input Range | ±512 mV | ±512 mV | ±512 mV | ±512 mV | ±512 mV | ±512 mV |
| Calibration Code | C10203 (factory-trimmed) | None (standard) | None (standard) | TGA7 (custom) | None (extended temp) | None (commercial) |
| Operating Temperature | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | 0 °C to +70 °C | -40 °C to +85 °C (extended) | 0 °C to +70 °C |
Key Differentiators
- Factory-calibrated C10203 suffix for out-of-box accuracy (vs MAX132CWG+)
- Wide-body SOIC for better analog/digital isolation (vs MAX132CNG+ (narrow-DIP))
- Commercial temperature grade matched to factory-floor enclosures (vs MAX132EWE+ (extended temperature))
Design Notes
The MAX132CWG+C10203 requires ±5 V analog supplies and a +5 V digital supply. Decouple AVDD+, AVDD-, and DVDD each with a 10 µF tantalum in parallel with a 0.1 µF ceramic placed within 5 mm of the respective supply pins. The analog and digital grounds should connect at a single star-point near the IC's AGND pin to avoid ground-loop noise coupling into the integration capacitor.
Route the INHI and INLO traces as a tightly coupled differential pair with ground guard traces on both sides, from the load-cell or sensor to the IC pins. The CREF+, CREF-, INT+, and INT- capacitor traces should be short (under 10 mm) and guarded from digital switching traces, because the integrating architecture can pick up digital crosstalk as conversion error at the 2 µV/LSB level.
Use a low-TC, low-noise external reference such as the MAX6325 (2.5 V) at the REF pin with a 0.1 µF ceramic plus 10 µF tantalum decoupling pair. Reference noise directly translates to conversion noise in integrating ADCs - a 10 µVrms reference yields at least 5 LSBs of conversion noise. Keep the reference trace away from the SCLK and DOUT digital traces.
Do not omit the integration capacitors (INT+, INT-) or the reference capacitor (CREF+, CREF-) - these are mandatory external components and their values set the integration time constant per the design-equation table in the Maxim datasheet. Also, the BUF pin must connect to INT+ through the buffer-amplifier external capacitor network shown in the datasheet typical application circuit. Skipping any of these components causes the ADC to fail calibration at power-up.
Although the MAX132CWG+C10203 dissipates less than 500 mW, the 24-pin WSOIC thermal pad (if used) should be soldered to a copper pour for production runs to keep the die below +70 °C in enclosed industrial cabinets. For outdoor weigh-scale installations, consider the MAX132EWE+ extended-temperature variant (-40/+85 °C) instead.
