PCM1804DBRG4

The PCM1804DBRG4 is a low-power, low-noise, 24-bit stereo audio CODEC. Its 24-bit A/D and D/A converters offer a sample rate of up to 192kHz. The ADC and DAC data interface is via a parallel 2’s compliment data format with 24-bit resolution and 24-bit alignment accuracy. The PCM1804DBRG4 features two low-noise analog microphone inputs with switches for digital/analog modes, and two low-noise analog line/headphone outputs, with a headphone amplifier and mute control. The CODEC also features low-power sleep mode.

The PCM1804DBRG4 operates by using a delta-sigma analog-to-digital converter, which is a type of feedback converter that uses a linear feedback shift register and a low-pass filter to convert an analog input signal into a digital output. In the delta-sigma converter, the analog input is sampled at a rate greater than the Nyquist frequency. This ensures that the output is accurately represented by the Nyquist sampling rate. The delta-sigma A/D converter then passes the sample through a series of low-pass filters, which reduces the amount of noise in the signal and allows for more accurate reproduction of the input signal.