On Monday, March 21, 2011 5:46 PM, Christophe Aeschlimann wrote: [...] > > The symptoms were slightly different on our custom board which > uses a > TLV320AIC3107 codec : > > After every cold boot the system would take ~7 seconds to > start recording. Recording a second time just after the first > time would behave normally (without delay). > > This delay was because the ADC (audio input) starts working > when the volts reach 1.35V (common mode) on the ADC. But a > 10uF series capacitor was delaying the ramp-up by 7 seconds. > Reducing the capacitor size changed the delay to something > more reasonable (ms range). > > This "issue" is described in the TLV320AIC3107 codec under > "INPUT IMPEDANCE AND VCM CONTROL" the 2nd paragraph. (they > also offer a workaround but this was not of a practical use in > our case). >
Thanks for the info. Regards, Vaibhav _______________________________________________ Davinci-linux-open-source mailing list [email protected] http://linux.davincidsp.com/mailman/listinfo/davinci-linux-open-source
