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NAU85L40B
NAU85L40B
Quad Audio ADC with Integrated FLL and Microphone Preamplifier
Description
The NAU85L40B is a low power, high quality, 4-channel ADC for microphone array application. The NAU85L40B integrates programmable gain preamplifiers for quad differential microphones, significantly reducing external component requirements. A fractional FLL is available to accurately generate any audio sample rate using any commonly available system clock source from 8KHz through 33MHz. Audio data can be directed to two I2S data out lines or onto a single time division multiplexed (TDM) PCM data output.
The NAU85L40B operates with analog supply voltages from 1.6V to 2V, while the digital core can operate down to
1.2V to conserve power. Internal register controls enable flexible power saving modes by powering down sub-
sections of the chip under software control. The NAU85L40B is specified for operation from -40°C to +85°C, and is
available in a 28-lead QFN package.
Features
103dB.