Multichannel ADCs integrate audio codec features

Powered from a single 3.3V supply, the PCM1865 audio ADC removes the traditional requirement for a dedicated analogue 5V rail, making smaller, more efficient products possible. Each device in the family solves many system-level design headaches, including hum and ground noise, input-signal level sensitivity, and attenuation, all with a single device. This integration is particularly beneficial for end equipment such as personal computers, sound bars, audio docks, Bluetooth speakers and video-security systems, as well as automotive infotainment equipment including after-market head units, amplifiers and active noise-cancellation systems.

The PCM1865 family consists of six pin-to-pin compatible devices offering two- and four-channel options, with software- and hardware-controlled variants. Three of the six devices in the PCM1865 family can achieve up to 110dB performance. No other audio ADCs on the market can achieve a performance level of 110dB with a single 3.3V power supply.

With direct, high-voltage 2.1V_RMS support, the devices optimise audio quality and allow for a higher SNR. Additionally, the software-controlled devices’ automatic clipping-suppression feature helps designers optimise input sensitivity for maximum SNR. The audio ADCs can deliver the same performance as competing solutions while potentially eliminating as many as 20 components. The devices integrate a clock-generating PLL, programmable gain amplifier and universal front end, which supports various inputs from low-level microphones to 4.2V_RMS differential inputs. Designers can easily configure single-ended and differential inputs to cancel hum and ground noise.

The integration of TI’s patent-pending Energysense technology helps designers meet operating requirements set by the EU's Ecodesign Directive. By using the on-chip secondary ADC, designers can easily set both sleep and wake-up thresholds, which can help equipment achieve the energy efficiency levels required by this directive.

Designers can start developing with the PCM1865 family through easy-to-use EVMs including the PCM1865EVM, which can be purchased in the TI store for $149. Support is also available in the TI E2E Community Audio Converters forum, where engineers can search for solutions, get help, share knowledge and solve problems with fellow engineers and TI experts.

Available in 7.8x4.4mm, 30-pin TSSOP packages, the devices are claimed to be up to 45% smaller than competing devices. Pricing starts at $1.40 in 1,000 unit quantities.