The automotive industry is experiencing a major transformation focused on comfortable driving experience without compromising fuel-efficiency and manufacturing cost. Car OEMs are constantly refreshing their audio system architecture to accommodate user-rich experience and better safety by incorporating several new audio technologies. These audio technologies such as active noise cancellation (ANC), in-cabin communication (ICC), and hands-free voice beam-forming use several microphones, amplifiers, and loudspeakers along with advanced digital signal processing techniques to enable background noise reduction, clear voice communication between passengers and hands-free calling. ANC is often incorporated in multiple end-equipments such as head-unit (or digital cockpit processing unit) or external amplifiers or can have it's own standalone module. To make the system implementation simple and cost-effective, the audio inputs from ANC microphones can be combined with hands-free microphones or other auxiliary line inputs. This paper highlights the several use-case of PCM6xx0-Q1 for microphone and line input applications.

To accommodate the short- and long-term vision of OEMs and TIer1s in most cost-optimized and space-constrained manner, Texas Instrument’s developed a highly-integrated, package- and software- compatible multi-channel audio ADC family called PCM6xx0-Q1. These devices support microphone (analog and digital) and line inputs and integrate a programmable high-voltage microphone bias and input fault diagnostics. These devices provide a very flexible digital filtering scheme with linear-phase and low-latency filters, multiple biquads per channel, and high-pass filters. PCM6xx0-Q1 family support a very flexible data output and control interface, allowing several devices to use the same output data and control interface bus. In addition, these devices have GPIOs, fine phase and gain calibration schemes, and a digital mixer and summer, to optimize the system performance to a whole new level. The different offerings of this audio ADC family are shown in Table 3-1.