Original question:
Other Parts Discussed in Thread: TLV320ADC3120, PCM1820, PCM4202, OPA1637, OPA1632
Hello,
I have an analog audio source which I want to convert to I2S Audio.
Most of the ADCs from TI are made for small input voltages for microphones and so.
But I want to capture audio from an professional pro audio amplifier with 23 dBu and 560 Ohms output.
Is there a reference design for that?
What would you recommend to use?
Best regards
Hi Christopher,
Sorry I misunderstood before, in this situation you would need an attenuator of sorts to scale down the voltage. Here is a reference design for one to work with the PCM4202 ADC, where the voltage of circuit is scaled down by 3.7 with high impedance output.
You don't have to use exact part shown in picture but it should have equivalent audio precision qualities.
Using voltage divider is not a stable solution.
Best Regards,
Carson
Used OPA1637 because Input Swing may exceed the max. +/- 15V limit of the OPA1632 ...
23 dBu is nearly 31V p-p, so +15.5 to -15.5 Volts. As OP1632 is not Rail-Rail and needs 1 V headroom but max. V+ is 16,0V (and would require at least 16.5V).
Is this correct?
