Four-ADC, Two-DAC, Low Power Codec with Audio Processor

The ADAU1777 is a codec with four inputs and two outputs that incorporates a digital processing engine to perform filtering, level control, signal level monitoring, and mixing. The path from the analog input to the DSP core to the analog output is optimized for low latency and is ideal for noise canceling headsets. With the addition of just a few passive components, a crystal, and an EEPROM for booting, the ADAU1777 provides a complete headset solution.

Note that throughout this data sheet, multifunction pins, such as SCL/SCLK, are referred to either by the entire pin name or by a single function of the pin, for example, SCLK, when only that function is relevant.

Applications

* Noise canceling handsets, headsets, and headphones

* Bluetooth® active noise cancelling (ANC) handsets, headsets, and headphones

* Personal navigation devices

* Digital still and video cameras

* Programmable audio processing engine

* Fast (up to 768 kHz) and slow processing paths

* Biquad filters, limiters, volume controls, and mixing

* Low latency, 24-bit ADCs and DACs

* 102 dB SNR (through PGA and ADC with A weighted filter)

* 108 dB combined SNR (through DAC and headphone with A weighted filter)

* Serial port sampling rate from 8 kHz to 192 kHz

* 5 μs analog-to-analog latency

* 4 single-ended analog inputs, configurable as microphone or line inputs

* Dual stereo digital microphone inputs

* Stereo analog audio output, single-ended or differential,

* configurable as either line output or headphone driver

* PLL supporting any input clock rate from 8 MHz to 27 MHz

* Full duplex, asynchronous sample rate converters (ASRCs)

* Power supplies

* Analog and digital input/output of 1.8 V to 3.3 V

* Digital signal processing (DSP) core of 1.1 V to 1.8 V

* Low power

* I2C and SPI control interfaces, self boot from I2C EEPROM

* 7 multipurpose (MPx) pins for digital controls and outputs