Hi all, I am asking about the SPI timing of the AD5270/AD5271 for write operation.Please tell me about tRDAC_R - PERF and tRDAC_NORMAL written in the data sheet.
We thought as follows:
Which is the right choice?
①Write command execution time of RDAC register
The value that determines 16-bit command transmission time as follows: R-PERF:2 us max NORMAL:600 ns max
②Specified time of SYNC
The value that determines High time of SYNC^ as follows: 500 ns or more, Less than each time
③Clerical error of min time(Minimum SYNC^ high time for register write)
Although R-PERF is described as 2 us max and NORMAL as 600 ns max, This is a clerical error of min.
④Clerical error of min time(Let the command transmission time be t8 + Trdac_r - perf)
I am not clear as to what you are asking. Could be please elaborate your concerns?
I'm sorry I didn't make it clear enough.
In Table 7 of the data sheet P.7,There are parameters tRDAC_R - PERF and tRDAC_NORMAL.And the following comments are stated.
tRDAC_R - PERF :2 us max / RDAC register write command execute timetRDAC_NORMAL :600 ns max / RDAC register write command execute time
I want to know the details of this parameter.Regards,
AD5270/1 has two modes of operation:
1. R-Performance mode: where the resistor tolerance can be upto 1% based on table 2 and 3 in the Datasheet.
2. Normal Mode: where the typical resistor tolerance is 15%.
By default the R-performance is enabled in AD5270/1
I would like to do the following operation in performance mode.[Write contents of serial register data to RDAC] -> [Write contents of serial register data to RDAC]
For this should i wait for tRDAC_R-PERF:RDAC register write command execute time (2 us max ) or is it fine with t8:Minimum SYNC high time (500 ns min).
I would like to know the min SYNC high time after i write to RDAC .
I apologize for the urgency, I am still expecting your response regarding that.I would appreciate it if you could give your response.
You will have to wait for 2ms for the write operation to complete and then do the next SPI transaction.
In your reply, it is stated that I have to wait 2ms.In Table 7 of the data sheet P.7, the following comment are stated.tRDAC_R-PERF:RDAC register write command execute time (2 us max )
Is it correct with the understanding that I have to wait 2 us?
Let me elaborate it for you. When you are in R-performance mode you will have to wait 2us for the RDAC write command to be executed.