I read the AD2S80A's datasheet, and I have questions about the Digital Timing. 1. When BUSY Pin is low, I can read the conversion data. How long BUSY Pin hold low, then I can read the data? Because if the input to the converter changes continuously, then there will be pulses in the BUSY Pin, then when I can read the data. 2. If ByteSelect is high, and if the position Data is Data0~Data15, then whether these data will occur in the data bus like below shown: Bus DB1 DB2 DB3 DB4 DB5 DB6 DB7 DB8 DB9 DB10 DB11 DB12 DB13 DB14 DB15 DB16 Position Data Data15 Data14 Data13 Data12 Data11 Data10 Data9 Data8 Data7 Data6 Data5 Data4 Data3 Data2 Data1 Data0 3. DATA LOAD Pin is LO, DB1~DB16 is input pin. When DB1~DB16 is input pin, how should I use them?
1. The Busy output is initiated each time the internally generated position data changes by 1 LSB. It means that the frequency of the Busy pulses depends on the rotation speed of a resolver. In situation when resolver is rotating continuously you may control /INHIBIT input to stop data transfer from the up-down counter to the output latches to provide enough time to the micro/dsp/fpga to read the data. 2. Yes, the order you have shown is correct. 3. The Data Load mode should be used when the AD2S80A works as the Control Transformer and the Data input pins are used to feed the ratio multiplier of the AD2S80A. Please find more information on how to feed ratio multiplier in the AN-203 application note: http://www.analog.com/media/en/technical-documentation/application-notes/AN-203. pdf