I want to know the difference, relative to the programming time, between the AD9910 andthe AD9858 by making a comparison in the first case serial and in the second caseparallel and serial.
thanks a lot,
In serial mode, the programming time is a function of the SCLK speed and the number of bits to be written. So, multiple 1/SCLK * the number of bits in the register(s) to be addressed. Don't forget to include the instruction byte or 8-bits. The max SCLK speed for the AD9910 is 70MHz and 10MHz for the AD9858.
The AD9910 only has a SPI interface. However, the device can be configured via SPI to accept 16 bit parallel data (frequency, phase, or amplitude) on the 16 pins provided for this function. In this mode, the parallel pins provides FSK, PSK or ASK modulation capability. It cannot write to the internal registers like the SPI. The max data rate for this modualtion mode equals the SYNC_CLK rate. The SYNC_CLK rate runs at 1/4th the internal system clock rate. So, the max SYNC_CLK rate is 1GHz/4 or 250MSPS.
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