Arduino based SPI programming of LT1257 not working
I read the LT1257 data-sheet more carefully. There is a pull down nmos at the output of the DAC. So when uninitialized, the output of LT1257 should be ~0V. So the output I was measuring (~1.02V) is spurious. I suspect I damaged the IC. I tried the same code on a different LT1257 and it worked. I can confirm now that this code is working.