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NS公司的M73201是16位50-250kSPS取樣差分輸入微功耗的ADC,在溫度−40℃到+85℃的范圍內信號精度優于± 0.003%,共模信號抑制比(CMRR)為85dB,主要用于太陽能電池PV DC Arc檢測系統,傳感器接口,I/O模塊,太陽能數據采集,馬達控制和儀表和控制系統.本文介紹了SM73201主要特性, 方框圖和典型應用電路圖,以及低功耗低成本數據采集系統框圖,SolarMagic SM73201 DC Arc 檢測評估板主要特性,框圖,模擬前端以及材料清單(BOM). SM73201:16-Bit, 50 to 250 kSPS, Differential Input, MicroPower ADC The SM73201 is a 16-bit successive-approximation register (SAR) Analog-to-Digital converter (ADC) with a maximum sampling rate of 250 kSPS. The SM73201 has a minimum signal span accuracy of ± 0.003% over the temperate range of −40℃ to +85℃. The converter features a differential analog input with an excellent common-mode signal rejection ratio of 85 dB, making the SM73201 suitable for noisy environments. The SM73201 operates with a single analog supply (VA) and a separate digital input/output (VIO) supply. VA can range from +4.5V to +5.5V and VIO can range from +2.7V to +5.5V. This allows a system designer to maximize performance and minimize power consumption by operating the analog portion of the ADC at a VA of +5V while interfacing with a +3.3V controller. The serial data output is binary 2’s complement and is SPI™ compatible. The performance of the SM73201 is guaranteed over temperature at clock rates of 1 MHz to 5 MHz and reference voltages of +2.5V to +5.5V. The SM73201 is available in a small 10-lead MSOP package. The high accuracy, differential input, low power consumption, and small size make the SM73201 ideal for direct connection to bridge sensors and transducers in battery operated systems or remote data acquisition applications. SM73201主要特性： ■ Renewable Energy Grade ■ Guaranteed performance from 50 to 250 kSPS ■ ±0.003% signal span accuracy ■ Separate Digital Input/Output Supply ■ True differential input ■ External voltage reference range of +0.5V to VA ■ Wide input common-mode voltage range of 0V to VA ■ SPI™/QSPI™/MICROWIRE™ compatible Serial Interface ■ Operating temperature range of −40℃ to +85℃ ■ Small MSOP-10 package SM73201主要指標： ■ Conversion Rate 50 kSPS to 250 kSPS ■ Offset Error Temp Drift 2.5 μV/℃ ■ Gain Error Temp Drift 0.3 ppm/℃ ■ SNR 93.2 dBc ■ THD − 104 dBc ■ Power Consumption ■ — 200 kSPS, 5V 5.3 mW — 250 kSPS, 5V 5.8 mW — Power-Down, 5V 10 μW SM73201應用： ■ PV DC Arc Detect System ■ Direct Sensor Interface ■ I/O Modules ■ Solar Data Acquisition ■ Motor Control ■ Instrumentation and Control Systems 
圖1。SM73201方框圖
圖2。SM73201典型應用電路圖
圖3。SM73201低功耗低成本數據采集系統框圖 SolarMagic參考設計RD-195:SolarMagic SM73201 DC Arc 檢測評估板 The SolarMagic™ reference design kit RD-195 includes the SM73201-ARC-EV PCB which is a UL1699B compliant Photo-Voltaic Arc Detect System with a minimal footprint of less than 50 mm x 30 mm. The reference design utilizes National Semiconductor`s advanced Analog technology along with an innovative dynamic filtering technique to effectively detect the signature of Arcing conductors in the presence of highly noisy real world environments. Implemented with National Semiconductor`s PowerWise® technology, the Analog path requires less than 50 mW of power to implement the active filtering. The operation range of the device covers the industrial temperature range of -40℃ to +125℃. SolarMagic™ technology is an overall solution that works in existing and new installations, residential, commercial, and utility scale projects. National Semiconductor`s 50 years of experience in the electronics industry delivers unsurpassed manufacturing, design, and development technology.
圖4。SolarMagic SM73201 DC Arc 檢測評估板外形圖 主要特性： • 1,000V isolation • Maximum DC string current=15A • Simple LED arc detection flag • Industrial Temperature Range (-40℃ to +125℃) • Small PCB footprint of less than 50mm x 30mm. • Low power requirement <400mW
圖5。SolarMagic SM73201 DC Arc 檢測評估系統框圖
圖6。模擬前端
圖7。A/D轉換器 SolarMagic SM73201 DC Arc 檢測評估板材料清單：
詳情請見： http://www.national.com/ds/SM/SM73201.pdf 和 http://www.national.com/an/AN/AN-2154.pdf |
