ADAU1977WBCPZ quad ADC with integrated diagnostics
The ADAU1977 integrates four high performance analog-to-digital converters (ADCs) with directly coupled inputs with 10 V rms performance. The ADC uses a multi-bit sigma-delta architecture with a continuous-time front end that enables low EMI performance. It can be connected directly to an electret microphone (ECM) and provides the required bias to power the microphone. Built-in diagnostic circuitry detects faults on the input line, including comprehensive diagnostics for microphone input faults. The following faults can be reported: short to battery, short to microphone bias, short to ground, short between positive and negative input pins, and open input pins. In addition, each diagnostic fault can be indicated by the IRQ logo to facilitate system design. At the same time, it also has a built-in I2C/SPI control port. The ADAU1977 operates from a single 3.3 V supply. A microphone bias voltage can be generated inside the device. The microphone bias can be programmed in several steps from 5 V to 9 V. The low-power architecture reduces the power consumption of the device. The on-chip PLL can derive the master clock from an external clock input or frame clock (sample rate clock). When using a frame clock, there is no need to use a separate high-frequency master clock in the system due to the presence of the PLL. The ADAU1977 is available in a 40-lead LFCSP package.
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- Automotive audio systems
- Active noise cancellation system
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Features and benefits
Programmable microphone bias with diagnostics (5 V to 9 V)
Four 10 V rms directly coupled differential inputs
The on-chip PLL is used to obtain the master clock
Low electromagnetic radiation design
ADC dynamic range: 106 dB
THD + N：-95 dB
Optional digital high-pass filter
24-bit ADC with 8 kHz to 192 kHz sample rate