ADI ADL5304高速200dB对数转换解决方案

ADI 公司的确ADL5304是高速200dB测量范围的对数转换器,具有快速响应和低噪音,正常对数斜率10 mV/dB(200 mV/decade),单电源工作的输入电流在1pA到3mA,双电源工作的输入电流可扩展至10mA,输入电流大于1uA时的带宽大于4MHz,主要用在高精度光功率测量,宽范围基带对数压缩和高速APC回路的检测.本文介绍了ADL5304主要特性,简化方框图,多种参数测量电路图以及单电源工作基本连接图,评估板电路图和PCB布局图.

The ADL5304 is a high speed logarithmic converter with fast response and low noise over a 200 dB (1 pA to 10 mA) measurement range. The ADL5304 provides a nominal logarithmic slope of 10 mV/dB (200 mV/decade); other values are easily configured. Logarithmic intercept can be programmed over a wide range with the internal 100 nA current source or externally for log ratio applications. The default intercept value of 3.162 fA places the midpoint of the measurement range of 100 nA at VLOG = 1.5 V.

A single positive supply of 5 V is all that is required for operation over a specified 1 pA to 3 mA input range. Dual-supply operation extends the specified input current range to 10 mA.
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