Features and Benefits
- 8 channels of PDM audio inputs from digital microphones
- 16×, 32×, or 64× decimation ratio of PDM to PCM audio data
- 24-bit resolution to support high sound pressure level (SPL) microphones
- 126 dB A-weighted SNR
- 4 kHz to 192 kHz output sampling rate
- Bit clock rates of 64×, 128×, 192×, 256×, 384×, or 512× the output sampling rate
- Dual output PDM clocks
- Automatic PDM clock generation
- Automatic power-down when BCLK removed
- Selectable I2C control or hardware mode operation
- 1.2 mA DVDD operating current for 8 channels at 48 kHz frequency sampling rate and 1.8 V supply
- Slave I2S or TDM output interface
- Up to TDM-16 supported
- Configurable TDM slot routing and sizes
- I/O supply voltage from 1.70 V to 3.63 V
- DVDD supply voltage from 1.10 V to 1.98 V
- <5 μA typical DVDD shutdown current
- 16-lead, 3 mm × 3 mm, 0.50 mm pitch LFCSP
- Power-on reset
The ADAU7118 converts four stereo pulse density modulation (PDM) bitstreams into one pulse code modulation (PCM) output stream. The source for the PDM data can be eight microphones or other PDM sources. The PCM audio data is output on a serial audio interface port in either inter-IC serial (I2S) or time domain multiplexed (TDM) format.
The ADAU7118 is specified over the commercial temperature range (−40°C to +85°C). The ADAU7118 is available in a 16-lead, 3 mm × 3 mm, 0.40 mm pitch, lead frame chip scale package (LFCSP).
Note that throughout this data sheet, multifunction pins, such as ADDR/CONFIG, are referred to either by the entire pin name or by a single function of the pin, for example, ADDR, when only that function is relevant.
- Microphone arrays
- Mobile computing
- Portable electronics
- Consumer electronics
- Professional electronics
Product Lifecycle Recommended for New Designs
This product has been released to the market. The data sheet contains all final specifications and operating conditions. For new designs, ADI recommends utilization of these products.
Evaluation Kits (1)
The ADAU7118 is a converter that takes in a Pulse Density Modulation signal from a MEMS (Micro Electromechanical System) microphone and converts it into an I2S (Inter IC Serial bus) signal or a time domain multiplexed (TDM) serial communication bus. The EVAL-ADAU7118Z can be set to operate in hardware mode or configured to control the ADAU7118 via I2C communication interface. An I2S serial interface is accessible via header pins spaced at 0.1 inches. Pulse density modulation (PDM) data and the clock interface are available on these headers. The evaluation board can be connected to an external 5 V dc power supply and ground or can be powered from the USB interface. On-board regulators derive supplies of 3.3 V, 1.8 V, and 1.2 V. The evaluation board can be configured to operate fully from external power supplies bypassing the on-board regulators. Current measurements of the ADAU7118 are made with the supplied header pins.
The ADAU7118 can be controlled through an I2C interface. A small, external interface board, EVAL-ADUSB2EBZ, (USBi) connects to a PC USB port and provides I2C access to the evaluation board through a ribbon cable. The USBi is not required to control the evaluation board from a user supplied I2C master controller. The EVAL-ADUS2EBZ is supplied with the EVAL-ADAU7118Z evaluation board and does not require a seperate purchase.
The Automated Register Window Builder graphical user interface (GUI) simplifies programming the device in a Windows® PC environment. The SigmaStudio GUI can also be used to control the ADAU7118. The evaluation board allows demonstration and performance testing of the features of the ADAU7118.
Software & Systems Requirements
Software Development Tools
ADI has always placed the highest emphasis on delivering products that meet the maximum levels of quality and reliability. We achieve this by incorporating quality and reliability checks in every scope of product and process design, and in the manufacturing process as well. "Zero defects" for shipped products is always our goal.
Sample & Buy
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