LDC1614 Calculate actual sensor frequency

Andreas H

Other Parts Discussed in Thread: LDC1614

Hello,

in order to calculate the actual sensor frequency from the conversion result of a LDC1614, the formula provided in the datasheet (www.ti.com/.../ldc1614.pdf) in chapter 7.3.2 on page 11 (equation 2) is

F_SENSOR = DATA_CHx * F_REFx / (2^28)

Since the sensor frequency can also be divided, am I wrong assuming this equation should be

F_SENSOR = DATA_CHx * F_REFx * CHx_FIN_DIVIDER / (2^28),

just like equation 8 on page 14 would be if CHx_OFFSET was 0? Or does the LDC change the calculation if an offset is used?

Best regards,

Andreas H

over 9 years ago

0 Ben Kasemsadeh over 9 years ago

TI__Genius 13650 points

Hello Andreas,

I apologize if the datasheet is unclear. Equation 8 is the complete version of the equation. The first equation that you referenced is a simplified equation that assumes that the clock divider is set to 1 and that the offset is set to 0, as is the case in the majority of applications.

Please use equation 8.

0 Andreas H over 9 years ago in reply to Ben Kasemsadeh

Prodigy 160 points

Hello Mr Kasemsadeh,
thank you very much for clarifying this!
Best regards,
Andreas H

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LDC1614 Calculate actual sensor frequency