ice40fpga达到常用的类比功能-CommonAnalogFunctions.PDFVIP

TM Common Analog Functions Using an iCE40 FPGA Integrate discrete analog devices into the iCE40 Ultra-Low Density FPGA Analog Functions in an FPGA FPGA designers are familiar with implementing digital designs by Symbol Description VCCIO=1.8V VCCIO=1.8V Units using FPGAs to glue together various processors, memories, and VcmH Common mode voltage high VCCIO/2 + 0.2 VCCIO/2+ 0.3 V standard functions. In addition to these digital functions, FPGAs Vcm Common mode voltage VCCIO/2 VCCIO/2 V can also be used to implement some common analog functions. VcmL Common mode voltage Low VCCIO/2 - 0.2 VCCIO/2-0.3 V By using an LVDS input, a simple resistor capacitor (RC) circuit Icomp ICCIO per comparator 160 160 µA and some FPGA digital logic elements, designers can create a Table 1: Common mode operating ranges comparator, Analog-to-Digital Converter (ADC), Digital-to-Analog Converter (DAC), or simple temperature monitoring system. generated by photo diode current, IN_P. When infrared light is Basic Comparator applied, OUT will switch from low to high. The iCE40™ FPGA family offers 2 to 23 Low Voltage Differential Within the specified common mode range described in Table 1, Signal (LVDS) I/O pairs depending on density and package