MAX134CPL+ - 3.75-Digit Dual-Slope ADC | Analog Devices
料号： MAX134CPL+ ✓ 量产中MAX134CPL+ 概述
A digital multimeter circuit is a specialized mixed-signal front end that converts an unknown analog input into a calibrated numeric representation suitable for a meter display. In the electronics hierarchy, the MAX134CPL+ belongs to the ADC family, combines analog measurement circuitry with digital processing, and ultimately belongs to the broader data-converter and signal-processing semiconductor category. Its 3.75-digit resolution and dual-slope operating principle are optimized for measuring direct-current voltage, resistance, and related quantities in a digital multimeter.
The primary feature set includes one analog input channel, a proprietary conversion method, a 20 samples-per-second conversion rate, and direct BCD-compatible output. The 3.75-digit format provides 3,999-count resolution, while the 40-pin PDIP package provides 40 accessible connections through-hole for straightforward instrumentation prototyping. Its commercial temperature grade and through-hole construction distinguish it from surface-mount-only mixed-signal converters and make it particularly accessible for laboratory and instrument development.
MAX134CPL+ is an application-specific converter rather than a conventional successive-approximation ADC. A dual-slope conversion averages the input over a defined integration interval, which is a common technique for suppressible noise in slowly changing measurements. The verified distributor information identifies the conversion method as proprietary and confirms single-channel operation, 20 sps performance, dual-slope operation, BCD output, and the 40-pin PDIP format.
Typical uses include handheld and bench-top digital multimeters, panel meters, production-line test equipment, and educational laboratory instruments. A designer can use the device where a readable three-and-three-quarter-digit result and a straightforward DIP footprint are more valuable than the channel count or resolution of a general-purpose ADC. Its 20 sps rate is suitable for slow-changing values but is not intended for high-speed waveform acquisition.
Designers should verify the complete electrical limits, recommended input network, reference circuit, display interface, and calibration procedure in the manufacturer datasheet before production. Because the supplied data does not expose a complete verified pin table or reference-design schematic, engineers should not infer pin functions from generic ADC layouts; the 40-pin package and device behavior must be checked directly against the official MAX134 documentation.
This page consolidates the verified manufacturer and distributor facts for the MAX134CPL+, including its 3.75-digit architecture, 20 sps conversion rate, BCD output, PDIP-40 mechanical format, current pricing references, same-family drop-in candidates, and practical design considerations. It is intended as an engineering selection aid that is more transparent than a distributor title or search-result summary.
直接替换替代料： MAX134CPL+ ——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： MAX134CPL+ （相同外形与封装尺寸） ——差异在于 Temperature Grade, Conversion Method, Device Type, Operating Temperature Range.
MAX134EPL+
✅ 直接替换联系询价
查看数据手册 →MAX134CPE+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX134EPE+
✅ 直接替换 ⚠️ 规格未核验📋 参考替代料（不在目录中）
MAX134CPL
✅ 直接替换📋 参考替代料（不在目录中）
MAX134EPL+
✅ 直接替换联系询价
查看数据手册 →MAX134CPL+ 最大额定值与电气特性
| Device Type | Specialized 3.75-digit digital multimeter ADC |
| Architecture | Proprietary method |
| Conversion Method | Dual-slope |
| Number of Channels | 1 channel |
| Conversion Rate | 20 samples/s |
| Output Format | BCD |
| Display Resolution | 3.75 digits |
| Temperature Grade | Commercial |
| Package Code | DIP |
| Package Type | 40-pin PDIP |
| Package Shape | Rectangular |
| Terminal Form | Through-hole |
| Number of Terminals | 40 |
| 安装类型 | Through-hole |
| Input Voltage Limit | 40 V maximum |
| Manufacturer Product Status | Production |
| List Price Starting From | $22.44 |
| LCSC Advertised Price Starting From | $13.8033 |
MAX134CPL+ rectangular 引脚配置指南
MAX134CPL+（rectangular 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： MAX134CPL+.
请参阅 数据手册 以查看完整引脚配置。
典型应用
MAX134CPL+ 适用于 6 应用s: Handheld Digital Multimeter, Bench-Top Panel Meter, Production-Line Test Equipment, Educational Electronics Measurement Trainer, Industrial Process Monitoring, Portable Measurement Instrument.
Handheld Digital Multimeter
The MAX134CPL+ fits a handheld digital multimeter that must present slow-changing readings as a stable 3.75-digit BCD value. Its one-channel, 20 samples/s proprietary dual-slope conversion is appropriate for instrument-style measurements rather than waveform capture, while the 40-pin PDIP package simplifies prototype-board assembly and through-hole serviceability. The design should use the manufacturer application circuit for the input attenuator, reference source, switching network, and display interface. The principal benefit is that the converter is purpose-built for DMM measurement rather than requiring a general-purpose ADC and its supporting firmware. Verify calibration, input protection, and accuracy limits in the MAX134 datasheet before production.
Bench-Top Panel Meter
The MAX134CPL+ can serve as the measurement core of a bench-top panel meter designed to display voltage or resistance in a 3.75-digit format. Its 20 samples/s rate is sufficient for values that change gradually, and the BCD output can support an instrument-oriented display interface when implemented according to the manufacturer reference design. The DIP-40 through-hole package also makes the converter practical for laboratory construction and replacement. Because the device is a specialized DMM circuit, designers should implement the documented input conditioning and calibration sequence rather than treating it as a general-purpose ADC. Its advantage is a dedicated measurement path with a manageable 40-terminal package.
Production-Line Test Equipment
The MAX134CPL+ is suitable for compact production-line test equipment that checks a limited number of slowly varying electrical conditions and needs a readable 3.75-digit result. The 1-channel dual-slope conversion path and 20 samples/s throughput provide enough measurement speed for bench-style verification without requiring a high-speed data-acquisition converter. Its 40-pin PDIP package is useful where instruments are assembled on through-hole boards and serviced manually. The system designer should add the appropriate switching, protection, reference, and display circuitry and follow the manufacturer's calibration procedure. Compared with a general-purpose ADC, the specialized BCD-oriented device can reduce the amount of numeric decoding required by the instrument controller.
Educational Electronics Measurement Trainer
The MAX134CPL+ is well suited to an electronics laboratory trainer because it implements a dedicated 3.75-digit DMM conversion function with a 20 samples/s rate in an inspectable PDIP-40 package. Students can study the relationship between analog input conditioning, reference voltage, conversion timing, and the displayed BCD result without introducing the pin count and acquisition complexity of a high-resolution general-purpose ADC. The through-hole package supports educational prototyping and replacement on perforated boards or conventional through-hole PCBs. It is best used with the manufacturer-recommended input network and test arrangement so that measurement behavior reflects the intended design. The educational value comes from a purpose-built dual-slope meter circuit presented at a manageable scale.
Industrial Process Monitoring
The MAX134CPL+ can be used in a simple industrial process-monitoring instrument when the target value changes slowly and a three-and-three-four-quarter-digit display is sufficient. Its 20 samples/s conversion rate is appropriate for supervisory measurements, while the one-channel architecture limits it to applications requiring one converted measurement at a time. The 40-pin through-hole package supports ruggedized instrument-board construction more readily than a fine-pitch surface-mount alternative. Signal conditioning, isolation, surge protection, calibration, and the input voltage limit of 40 V maximum must be addressed in the complete system. The primary advantage is a dedicated DMM measurement engine with a direct BCD-oriented output rather than a general-purpose conversion platform.
Portable Measurement Instrument
The MAX134CPL+ supports a portable battery-powered measurement instrument that measures slowly changing values and displays them in a 3.75-digit format. Its 20 samples/s conversion rate avoids the unnecessary complexity and power of a high-speed ADC, while the DIP-40 package is practical for a low-volume portable instrument assembled on a through-hole PCB. The designer must verify the complete supply-voltage requirements, reference behavior, and display interface because those values are not included in the supplied distributor summaries. Calibration stability and the 40 V maximum input condition should also be checked against the complete datasheet. The device's benefit is a focused DMM converter optimized for readable, low-speed measurements.
工程参考数据： MAX134CPL+ ——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 | MAX134EPL+ | MAX134CPE+ | MAX134EPE+ | MAX134CPL | MAX134EPL |
|---|---|---|---|---|---|---|
| Package | PDIP-40 | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same | PDIP-40 - same |
| Brand | Analog Devices / Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated | Maxim Integrated |
| Product Type | Specialized 3.75-digit DMM circuit | Specialized 3.75-digit DMM circuit | Specialized 3.75-digit DMM circuit | Specialized 3.75-digit DMM circuit | Specialized 3.75-digit DMM circuit | Specialized 3.75-digit DMM circuit |
| Number of Channels | 1 channel | 1 channel | 1 channel | 1 channel | 1 channel | 1 channel |
| Conversion Method | Dual-slope | Dual-slope | Dual-slope | Dual-slope | Dual-slope | Dual-slope |
| Conversion Rate | 20 samples/s | 20 samples/s | 20 samples/s | 20 samples/s | 20 samples/s | 20 samples/s |
| Output Format | BCD | BCD | BCD | BCD | BCD | BCD |
| Resolution | 3.75 digits | 3.75 digits | 3.75 digits | 3.75 digits | 3.75 digits | 3.75 digits |
| Terminal Form | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole | Through-hole |
关键差异点
- Purpose-built digital multimeter conversion function （对比 MAX134EPL+)
- Direct PCB reuse with the closest cross-reference candidate （对比 MAX134EPL+)
- Same core functional parameters across the listed family （对比 MAX134CPE+)
设计说明
Do not treat the MAX134CPL+ as a generic high-resolution ADC. The verified device is a one-channel, 20 samples/s converter optimized for a 3.75-digit digital multimeter. The input network, switching arrangement, reference source, grounding, and BCD display interface must follow the manufacturer application information. Using a conventional ADC interface assumption can produce incorrect results even when the 40-pin package appears electrically compatible.
Place the MAX134CPL+ in the same through-hole board layout specified by the manufacturer and preserve the pin numbering and orientation of the 40-pin PDIP package. The supplied results confirm 40 through-hole terminals but do not provide a verified terminal-by-terminal table. Before routing or soldering, download the official datasheet and check each signal, supply, ground, reference, and unused terminal rather than relying on a generic PDIP drawing or an unverified pinout preview.
The Analog Devices product page states that the evaluation-kit input voltage is limited to 40 V maximum for safety reasons. Treat 40 V as a verified maximum input condition, not as permission to apply it directly to every MAX134CPL+ input without checking the complete datasheet limits, protection topology, supply requirements, and reference range. Add the required overvoltage and fault-current protection rather than relying on the converter's analog input to withstand an accidental instrument fault.
The 20 samples/s conversion rate is appropriate for slow-changing DMM measurements, not high-speed waveform acquisition. Route measurement inputs using the manufacturer-recommended conditioning network and keep sensitive analog, reference, and ground paths compact and away from switching or display-driver noise sources. The proprietary dual-slope method may reduce sensitivity to some noise, but the actual accuracy still depends on correct input filtering, reference stability, layout, and calibration.
合规信息
The supplied manufacturer and distributor snippets do not explicitly state RoHS, REACH, AEC-Q100, lead-free, halogen-free, or conflict-minerals status. The '+' ordering suffix is not treated as proof of a specific compliance declaration.