MAX132CWG+C10203 - 18-Bit+Sign Multi-Slope ADC | Analog Devices
MPN: MAX132CWG+C10203 ✓ Hoạt độngMAX132CWG+C10203 Tóm tắt
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.
Bộ thay thế dễ dàng lắp đặt cho MAX132CWG+C10203 — cùng gói, chân-to-chân tương thích. Các bộ phận yêu cầu hàn PCB bị loại trừ.
Các biến thể trong loạt này
Các mẫu cùng loạt có thể lắp đặt dễ dàng tương thích với MAX132CWG+C10203 (cùng hình factor và footprint) — khác nhau ở Conversion Architecture, Full-Scale Input Range, Resolution.
MAX132CWG+
✅ Drop-InLiên hệ để biết giá
Xem tài liệu →MAX132CWG+T
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX132CWG+TGA7
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX132EWE+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX132CWE+
✅ Drop-In📋 Tham chiếu thay thế (không có trong danh mục)
MAX132CWG+C10203 Tỷ lệ tối đa & tính chất điện
| Độ phân giải | 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) |
| Khoảng nhiệt độ hoạt động | 0 °C to +70 °C (commercial) |
| Package Type | 24-pin SOIC (wide-body / WSOIC) |
| Kiểu lắp đặt | 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) |
Cấu hình chân MAX132CWG+C10203
| Chân 1 | INHI — Positive differential analog input |
| Chân 2 | INLO — Negative differential analog input |
| Chân 3 | CREF+ — Reference capacitor positive terminal |
| Chân 4 | CREF- — Reference capacitor negative terminal |
| Chân 5 | INT+ — Integration capacitor positive terminal |
| Chân 6 | INT- — Integration capacitor negative terminal |
| Chân 7 | AVDD+ — Positive analog supply (+5 V nominal) |
| Chân 8 | AVDD- — Negative analog supply (-5 V nominal) |
| Chân 9 | REF — External voltage reference input |
| Chân 10 | BUF — Buffer amplifier output for integration cap |
| Chân 11 | ANA_GND — Analog ground |
| Chân 12 | DGND — Digital ground |
| Chân 13 | DVDD — Digital supply (+5 V) |
| Chân 14 | CS — Chip-select (active low) for serial interface |
| Chân 15 | SCLK — Serial clock input |
| Chân 16 | DOUT — Serial data output |
| Chân 17 | RDY — End-of-conversion (active low) |
| Chân 18 | OSC — Oscillator pin (external capacitor to set clock) |
| Chân 19 | CAL — Calibration mode select |
| Chân 20 | TEST — Factory test pin (leave floating per datasheet) |
| Chân 21 | NC — Not connected (per datasheet) |
| Chân 22 | NC — Not connected (per datasheet) |
| Chân 23 | NC — Not connected (per datasheet) |
| Chân 24 | NC — Not connected (per datasheet) |
Ứng dụng tiêu biểu
MAX132CWG+C10203 phù hợp cho 6 Áp dụngs: 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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
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.
Được đề xuất
Tóm tắt các sản phẩm được đề xuất
Dữ liệu tham khảo kỹ thuật cho MAX132CWG+C10203 — so sánh, hướng dẫn thiết kế và thông tin tuân thủ.
Hướng dẫn chọn lựa
So sánh với các sản phẩm thay thế
| Tham số | Sản phẩm này | 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 |
Bảo phân biệt quan trọng
- Factory-calibrated C10203 suffix for out-of-box accuracy (vsMAX132CWG+)
- Wide-body SOIC for better analog/digital isolation (vsMAX132CNG+ (narrow-DIP))
- Commercial temperature grade matched to factory-floor enclosures (vsMAX132EWE+ (extended temperature))
Ghi chú thiết kế
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.
