Other Parts Discussed in Thread: PCM4220
I have a customer asking for additional information about how the overflow detection circuit works. Please comments below:
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We are beginning our design using the PCM4220 and I have a question about the overflow outputs. From page 23 of the spec sheet:
The PCM4220 includes two active-high digital overflow outputs, OVFL (pin 37) and OVFR (pin 38),
corresponding to the left and right channels, respectively. These outputs are functional when the PCM output
mode is enabled, as the overflow detection circuitry is incorporated into the digital filter engine. The overflow
indicators are forced high whenever a digital overflow is detected for a given channel.
My question relates to the nature of the overflow detection logic. Is a voltage > FS or < -FS being detected or is the fact that the digital filter saturates used to indicate an overflow condition? The reason for my question, in our application we are measuring narrow pulses that can clip the analog circuitry but not overflow the digital filters.
