Overview
The ADAU7118ACPZRL from Analog Devices Inc. is an 8-channel, pulse density modulation (PDM) to inter-IC serial (I2S) or time domain multiplexed (TDM) converter. This device is designed to convert four stereo PDM bitstreams into a single pulse code modulation (PCM) output stream. It supports inputs from eight microphones or other PDM sources and outputs the PCM audio data via a serial audio interface in either I2S or TDM format. The ADAU7118 is optimized for various applications requiring high-quality audio conversion and is specified over the commercial temperature range of −40°C to +85°C.
Key Specifications
| Specification | Value |
|---|---|
| Number of Channels | 8 channels |
| Input Format | Pulse Density Modulation (PDM) |
| Output Format | Inter-IC Serial (I2S) or Time Domain Multiplexed (TDM) |
| Resolution | 24-bit |
| Decimation Ratio | 16×, 32×, or 64× |
| Sampling Rate | 4 kHz to 192 kHz |
| Bit Clock Rates | 64×, 128×, 192×, 256×, 384×, or 512× the output sampling rate |
| Signal-to-Noise Ratio (SNR) | 126 dB A-weighted |
| Operating Voltage (DVDD) | 1.10 V to 1.98 V |
| Operating Current (DVDD) | 1.2 mA at 48 kHz and 1.8 V supply |
| Package Type | 16-lead, 3 mm × 3 mm, 0.40 mm pitch LFCSP |
| Temperature Range | −40°C to +85°C |
Key Features
- Automatic PDM clock generation and detection of clock format changes
- Selectable I2C control or hardware mode operation
- Support for up to TDM-16 output interface
- Configurable TDM slot routing and sizes
- Automatic power-down when bit clock (BCLK) is removed
- Low shutdown current (<5 μA typical)
- Power-on reset
Applications
- Microphone arrays
- Mobile computing
- Portable electronics
- Consumer electronics
- Professional electronics
Q & A
- What is the primary function of the ADAU7118? The ADAU7118 converts four stereo PDM bitstreams into a single PCM output stream.
- What are the supported output formats? The ADAU7118 supports output in either I2S or TDM format.
- What is the resolution of the ADAU7118? The ADAU7118 has a 24-bit resolution.
- What are the supported decimation ratios? The supported decimation ratios are 16×, 32×, or 64×.
- What is the operating temperature range of the ADAU7118? The operating temperature range is −40°C to +85°C.
- What is the typical operating current of the ADAU7118? The typical operating current is 1.2 mA at 48 kHz and 1.8 V supply.
- Does the ADAU7118 support automatic power-down? Yes, the ADAU7118 automatically powers down when the bit clock (BCLK) is removed.
- What is the package type of the ADAU7118? The ADAU7118 is available in a 16-lead, 3 mm × 3 mm, 0.40 mm pitch LFCSP.
- What are some common applications of the ADAU7118? Common applications include microphone arrays, mobile computing, portable electronics, consumer electronics, and professional electronics.
- Does the ADAU7118 support I2C control? Yes, the ADAU7118 supports selectable I2C control or hardware mode operation.
