ADI AD4002 18位2 MSPS SAR ADC解决方案

ADI公司的AD4002是低噪声低功耗高速18 位取样频率2 MSPS 精密逐次逼近寄存器 (SAR) 模数转换器 (ADC),集成了多种易用特性,可以减少信号链功率,降低信号链复杂性以及实现更高的通道密度.INL最大为±3.2 LSB,18位不丢码,10kSPS时功耗70uW,2MSPS时为14mW,SNR在1kHz,VREF = 5 V时为95dB,THD在1 kHz,VREF = 5 V时为-125dB,主要用在自动测试设备,机器自动化,医疗器械,电池供电设备和精密数据采集系统.本文介绍了AD4002/AD4006/AD4010主要特性,功能框图,ADC简化电路图,典型应用框图,以及评估板EVAL-AD400xFMCZ主要特性,框图,电路图,材料清单和PCB设计图.
The AD4002/AD4006/AD4010 are low noise, low power, high speed, 18-bit, precision successive approximation register (SAR) analog-to-digital converters (ADCs). The AD4002, AD4006, and AD4010 offer 2 MSPS, 1 MSPS, and 500 kSPS throughputs, respectively. They incorporate ease of use features that reduce signal chain power consumption, reduce signal chain complexity, and enable higher channel density. The high-Z mode, coupled with a long acquisition phase, eliminates the need for a dedicated high power, high speed ADC driver, thus broadening the range of low power precision amplifiers that can drive these ADCs directly while still achieving optimum performance. The input span com-pression feature enables the ADC driver amplifier and the ADC to operate off common supply rails without the need for a negative supply while preserving the full ADC code range. The low serial peripheral interface (SPI) clock rate requirement reduces the digital input/output power consumption, broadens processor options, and simplifies the task of sending data across digital isolation.
Operating from a 1.8 V supply, the AD4002/AD4006/AD4010 sample an analog input (IN+) from 0 V to VREF with respect to a ground sense (IN−) with VREF ranging from 2.4 V to 5.1 V. The AD4002 consumes only 14 mW at 2 MSPS with a minimum SCK rate of 75 MHz in turbo mode; the AD4006 consumes only 7 mW at 1 MSPS; and the AD4010 consumes only 3.5 mW at 500 kSPS. The AD4002/AD4006/AD4010 all achieve ±3.2 LSB ...