Good evening,
I am getting inconsistent programming of registers on the LMX2492 and I was hoping you could offer some insight.
Below is the same command programmed twice, it is programming the gain register 0x1C as 0x1F from a previous value of 0x0. The sclk speed is 125 kHz.
CH1 - latch enable
CH2 - clock
CH3 - data
CH4 - gain output
They were done one after the other. As you can see, the programming "took" after the second command with the gain rising.
I don't appear to be violating any timing rules of the chip and sometimes it takes 3 or 4 commands to actually take. My slew rate is much faster than the recommended 30V/us (checked on a better oscilloscope). My voltage high levels are above the 1.4V minimum threshold.
Is there a register programming procedure I am not following here? The data sheet did not seem to indicate anything specific.
Thank you,
Nicholas