MCP3423T-E/UN - 18-Bit Dual-Channel Delta-Sigma ADC | Microchip Technology
料号： MCP3423T-E/UN ✓ 量产中MCP3423T-E/UN 概述
The MCP3423 is part of the MCP342X family of delta-sigma ADCs designed for precision signal acquisition. A delta-sigma ADC converts an analog input by oversampling and digital filtering, which is useful when the application requires high resolution and good noise performance at relatively low conversion rates. The MCP3423 supports up to 18 bits of resolution and conversion rates up to 240 SPS, according to the manufacturer product information.
Key features include two differential channels, a 2.048 V onboard reference, automatic calibration, power-on reset, and a two-wire I²C-compatible interface. The differential input architecture helps reject common-mode noise when measuring low-level sensor outputs. The internal reference establishes a nominal differential input range of ±2.048 V, while the converter's low-noise architecture is intended for applications requiring accurate measurement of slowly changing analog quantities.
The device uses an I²C-compatible serial interface to transfer conversion results to a microcontroller or other digital controller. Configuration registers control the conversion cycle, input channel selection, gain, and operating mode. Because the converter is designed for low-rate precision measurement rather than high-speed waveform capture, its conversion timing should be considered in applications where latency or dynamic signal bandwidth is important.
Typical applications include pressure and temperature sensor interfaces, current sensing, bridge-transducer measurement, industrial process monitoring, and low-rate instrumentation. Differential inputs are particularly useful with resistive sensors whose outputs are referenced around a common midpoint. The internal reference is advantageous in compact systems where space, component count, and calibration complexity are constrained.
When laying out the circuit, route the analog inputs away from digital switching nodes and keep the input connections short. The supply and ground pins require effective bypassing close to the device, and the exposed-pad or thermal considerations should follow the package-specific land pattern in the manufacturer datasheet. Verify the conversion time, gain, reference configuration, and I²C address before finalizing the firmware. This page also organizes the device specifications, replacement considerations, and application guidance for faster engineering evaluation.
直接替换替代料： MCP3423T-E/UN ——相同封装，引脚兼容。需要 PCB 改动的不同封装料号已排除。
本系列中的变体
可与以下型号直接替换的同系列型号： MCP3423T-E/UN （相同外形与封装尺寸） ——差异在于 Digital Interface, Number of Input Channels.
MCP3423-E/UN
✅ 直接替换联系询价
查看数据手册 →MCP3423T-E/UN 最大额定值与电气特性
| 分辨率 | 18 bits |
| Number of Input Channels | 2 differential channels |
| Converter Architecture | Delta-sigma |
| Maximum Conversion Rate | 240 SPS |
| Onboard Reference Voltage | 2.048 V |
| Differential Input Range | ±2.048 V |
| 电源电压 | 3.3 V to 5 V |
| Digital Interface | I²C-compatible, 2-wire serial |
| Input Type | Differential |
| Automatic Calibration | Yes |
| Power-On Reset | Yes |
| 工作温度范围 | -40°C to +125°C |
| 封装 | 10-MSOP |
| 安装类型 | Surface mount |
| Packaging | Tape and reel |
| 采样率 | 3.75 SPS to 240 SPS |
| Data Interface | I²C, serial |
| RoHS 状态 | Not stated in the retrieved product information |
| REACH Status | Not stated in the retrieved product information |
| AEC-Q100 Qualification | Not applicable or not stated |
MCP3423T-E/UN 10-msop 引脚配置指南
MCP3423T-E/UN（10-msop 封装）的引脚配置。 该模拟元件具有输入、输出和电源引脚。请参阅制造商数据手册以了解失调调零、补偿和使能引脚配置。适用于信号调理和放大器电路。
暂无详细引脚数据： MCP3423T-E/UN.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MCP3423T-E/UN 适用于 6 应用s: Temperature Sensor Acquisition, Pressure and Bridge Transducer Measurement, Industrial Process Monitoring, Current Sensing and Load Monitoring, Battery-Powered Instrumentation, Precision Sensor Interface Module.
Temperature Sensor Acquisition
The MCP3423T-E/UN fits temperature sensing with RTDs, thermistors, or resistive bridges because its two differential channels can monitor sensor outputs while rejecting common-mode noise. The 18-bit resolution provides fine digital code spacing, and the 240 SPS maximum rate is more than adequate for typical thermal time constants. Connect the sensor to the differential inputs, use the internal 2.048 V reference where appropriate, and place input filtering close to the converter to preserve accuracy.
推荐
Pressure and Bridge Transducer Measurement
Pressure cells and strain-gauge bridges commonly produce small differential signals riding on a common-mode voltage, making the MCP3423T-E/UN's differential inputs a practical fit. Its 18-bit delta-sigma conversion and onboard 2.048 V reference support high-resolution readings without an external reference device. For best results, keep the bridge excitation and analog input routing quiet, verify the selected gain against the sensor output, and allow time for the conversion filter to settle before reading each result.
推荐
Industrial Process Monitoring
The MCP3423T-E/UN can monitor two slow-changing process variables such as tank level, valve position, or analog pressure in an industrial controller. Its 240 SPS maximum conversion rate is appropriate for supervisory measurements, while the differential inputs help reject noise coupled into long sensor cables. Use the I²C-compatible interface to read results from a microcontroller, implement timeout and status checks in firmware, and isolate analog inputs from motor, relay, and switching-power stages.
推荐
Current Sensing and Load Monitoring
A shunt amplifier or differential current sensor can feed the MCP3423T-E/UN to create a compact high-resolution current measurement channel. The two differential inputs allow the controller to monitor two related currents, such as load current and return current, while the 18-bit resolution helps detect small changes. A 240 SPS rate is sufficient for energy-management and protection functions that do not require waveform capture. Keep shunt and amplifier paths away from high-current edges to prevent conversion errors.
推荐
Battery-Powered Instrumentation
The low-rate precision conversion profile of the MCP3423T-E/UN makes it useful in portable measurement systems that periodically sample sensors rather than continuously capture waveforms. Its two differential channels, onboard 2.048 V reference, and I²C-compatible interface reduce the number of external support components in a compact embedded instrument. Firmware can power the converter, wait for the specified conversion sequence, read the result, and return the bus to an idle state to reduce system energy use.
推荐
Precision Sensor Interface Module
The MCP3423T-E/UN can serve as the conversion element in a dedicated sensor-interface module exposing two high-resolution differential measurements to a host controller. The onboard reference simplifies module-level design, while the I²C-compatible interface allows straightforward connection to embedded Linux, PLC, or microcontroller peripherals. Provide protection against sensor-cable transients, use a stable low-noise supply, and validate the full calibration chain from sensor excitation through conversion if long-term measurement accuracy is critical.
推荐
工程参考数据： MCP3423T-E/UN ——对比、设计指导和合规信息。
选型指南
与替代料对比
| 参数 | 本产品 | MCP3423-E/UN |
|---|---|---|
| Package | 10-MSOP | 10-MSOP |
| Brand | Microchip Technology | Microchip Technology |
| Resolution | 18 bits | 18 bits |
| Input Channels | 2 differential channels | 2 differential channels |
| Maximum Conversion Rate | 240 SPS | 240 SPS |
| Onboard Reference | 2.048 V | 2.048 V |
| Differential Input Range | ±2.048 V | ±2.048 V |
| Interface | I²C-compatible 2-wire serial | I²C-compatible 2-wire serial |
关键差异点
- Two differential inputs in a compact 10-MSOP footprint （对比 MCP3424T-E/ST)
- Onboard precision reference simplifies the analog system （对比 MCP3426A7T-E/MS)
- Direct same-family ordering alternative （对比 MCP3423-E/UN)
设计说明
Keep the MCP3423T-E/UN analog input traces short, guarded by a ground reference, and separated from switching-node copper. Place input filtering capacitors at the ADC pins and place supply bypass capacitors immediately across the device supply pins. A quiet analog ground return path is particularly important because the converter resolves low-level differential signals. Follow the package-specific land pattern and exposed-pad connection guidance in the manufacturer datasheet.
Configure the converter for a conversion rate that matches the signal bandwidth. The MCP3423T-E/UN supports up to 240 SPS, so high-frequency or transient content should be filtered before the inputs rather than relying on the ADC to reject it. Differential routing with matched impedance and symmetrical sensor connections improves common-mode rejection. Validate the analog filter and acquisition timing together in firmware to avoid aliasing or incomplete settling.
Do not treat the MCP3423T-E/UN as a high-speed sampling ADC: its 240 SPS maximum rate is intended for slow-changing sensor measurements. Check the channel-selection, gain, conversion-cycle, and status-register sequence in the manufacturer documentation before writing firmware. Also verify that the external supply and reference arrangement respects the absolute maximum ratings, and do not assume that the onboard 2.048 V reference removes the need for calibration or analog protection.
合规信息
The retrieved product information does not state RoHS, REACH, lead-free, halogen-free, conflict-minerals, or automotive-qualification status for this exact MPN. Confirm the current declarations with Microchip or the authorized supply chain before regulatory submission.
