Overview
The ADAU7118ACPZRL7, produced by Analog Devices Inc., is a sophisticated audio converter designed to convert pulse density modulation (PDM) signals into pulse code modulation (PCM) output streams. This device is capable of processing four stereo PDM bitstreams from sources such as digital microphones, converting them into a single PCM output stream. The PCM audio data is output via a serial audio interface in either inter-IC serial (I2S) or time domain multiplexed (TDM) format. The ADAU7118 is optimized for high-performance audio applications, offering features such as high sound pressure level (SPL) support and automatic PDM clock generation.
Key Specifications
| Parameter | Specification |
|---|---|
| Number of PDM Audio Channels | 8 channels |
| Decimation Ratio | 16×, 32×, or 64× |
| Resolution | 24-bit |
| Signal-to-Noise Ratio (SNR) | 126 dB A-weighted |
| Output Sampling Rate | 4 kHz to 192 kHz |
| Bit Clock Rates | 64×, 128×, 192×, 256×, 384×, or 512× the output sampling rate |
| PDM Clocks | Dual output PDM clocks with automatic generation |
| Operating Temperature Range | −40°C to +85°C |
| Package Type | 16-lead, 3 mm × 3 mm, 0.40 mm pitch LFCSP |
| DVDD Supply Voltage | 1.10 V to 1.98 V |
| IOVDD Supply Voltage | 1.70 V to 3.63 V |
| Operating Current (DVDD) | 1.2 mA at 48 kHz and 1.8 V supply |
| Shutdown Current (DVDD) | <5 μA typical |
Key Features
- 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
- Output sampling rates from 4 kHz to 192 kHz
- Bit clock rates of 64×, 128×, 192×, 256×, 384×, or 512× the output sampling rate
- Dual output PDM clocks with automatic generation
- Automatic power-down when BCLK is removed
- Selectable I2C control or hardware mode operation
- Slave I2S or TDM output interface, up to TDM-16 supported
- Configurable TDM slot routing and sizes
- Power-on reset
Applications
The ADAU7118ACPZRL7 is designed for various high-performance audio applications, including:
- Smart speakers and voice assistants
- Automotive audio systems
- Consumer electronics such as smartphones, tablets, and laptops
- Industrial audio monitoring systems
- Medical devices requiring high-quality audio input
Q & A
- What is the primary function of the ADAU7118?
The ADAU7118 converts four stereo pulse density modulation (PDM) bitstreams into one pulse code modulation (PCM) output stream.
- What are the supported decimation ratios for the ADAU7118?
The ADAU7118 supports 16×, 32×, or 64× decimation ratios of PDM to PCM audio data.
- What is the resolution of the ADAU7118?
The ADAU7118 has a 24-bit resolution.
- What is the signal-to-noise ratio (SNR) of the ADAU7118?
The SNR is 126 dB A-weighted.
- What are the supported output sampling rates for the ADAU7118?
The output sampling rates range from 4 kHz to 192 kHz.
- How does the ADAU7118 handle power-down?
The ADAU7118 automatically powers down when the bit clock (BCLK) is removed.
- What are the package dimensions of the ADAU7118?
The ADAU7118 is available in a 16-lead, 3 mm × 3 mm, 0.40 mm pitch LFCSP package.
- What is the operating current of the ADAU7118?
The operating current is 1.2 mA at 48 kHz and 1.8 V supply.
- Can the ADAU7118 be controlled via I2C?
Yes, the ADAU7118 can be controlled via an I2C interface or in hardware mode.
- What is the typical shutdown current of the ADAU7118?
The typical shutdown current is less than 5 μA.
