The TAC5142 ADC signal chain is comprised of very-low-noise, high-performance, and low-power analog blocks and highly flexible and programmable digital processing blocks. The high performance and flexibility combined with an integrated low noise stereo DAC and compact package makes the TAC5142 optimized for a variety of end-equipments and applications that require low noise multichannel audio record and playback. Figure 8-6 shows a conceptual block diagram for the TAC5142 that highlights the various building blocks used in the signal chain, and how the blocks interact in the signal chain.

Figure 8-6 ADC Signal-Chain Processing Flowchart

The ADC front-end in the TAC5142 is very low noise, with a 118-dB dynamic range performance. This enables the TAC5142 to record a far-field audio signal with very high fidelity, both in quiet and loud environments. Moreover, the ADC architecture has inherent antialias filtering with a high rejection of out-of-band frequency noise around multiple modulator frequency components. Therefore, the device prevents noise from aliasing into the audio band during ADC sampling. Further on in the signal chain, an integrated, high-performance multistage digital decimation filter sharply cuts off any out-of-band frequency noise with high stop-band attenuation. The TAC5142 supports sample rates of up to 192KSPS in both controller and target mode of operation.