The values for attenuation in the data sheet are above, at each of the four TRQ levels. I am not clear on what these mean and how I can use them. Can someone explain/clarify?
Charles,
Please see equation 1 in section 7.3.4 of the datasheet. Av is substituted into this equation from the table you see above. 6.6 is used in equation 1 as an approximation. You can directly plug in the vales from the electrical characteristics table for the TRQ settings you plan to use to get the most accurate representation.
Regards,
Ryan
Thanks Ryan, makes sense. Next related questions:
Figure 10 seems to imply that there is a minimum VREF for each TRQ configuration. True? This seems to be related to the recommended operating range for VREF of 0.3V? We use the device with an 8 bit DAC on VREF, and we also can toggle between 100% and 25% TRQ levels using GPIO. Rsense is 0.25 ohms. We are trying to see what will give us more accurate performance at, lets say, 50mA-150mA levels: using only 100% TRQ and vary the DAC, or switching between the 100% and 25% switch (along with appropriate DAC setting).
