Part Number: LM97937
Hi team,
My customer wants to understand the how much is the max DC level LM97937 could make on ADC output, both in burst-mode and SNR-Boost mode.
Could you kindly help?
Thanks!
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Part Number: LM97937
Hi team,
My customer wants to understand the how much is the max DC level LM97937 could make on ADC output, both in burst-mode and SNR-Boost mode.
Could you kindly help?
Thanks!
Hey Luke,
To find the max DC offset i used the absolute maximum ratings in the datasheet.
Given that Vcm is a recommended 1.6V and full scale range is a differential 1.7Vpp, you can derive the maximum offset by using the highlighted absolute maximum voltage for the input signals A & B.
Absolute minimum input pin voltage is Vcm -1V = 0.6V
Absolute max input pin voltage is Vcm + 0.75V = 2.35V
At full scale range of 1.7Vpp differential, the maximum DC offset is at least 2*( 2.35 - (1/4FSR+1.6V)) = 0.65V. Now convert to dBFs. 20log(.65/1.7) = -8.35dBFs for max DC at output with a common mode voltage of 1.6V