Overview
The AD1837AASZ-REEL, produced by Analog Devices Inc., is a high-performance single-chip codec that integrates multiple audio functions into a single device. This codec features four stereo digital-to-analog converters (DACs) and one stereo analog-to-digital converter (ADC). It is designed to provide high-quality audio conversion and is suitable for a variety of professional and consumer audio applications.
Key Specifications
| Parameter | Specification |
|---|---|
| ADC Channels | 2 (stereo pair) |
| ADC Sample Rate | Up to 96 kHz |
| ADC Resolution | 24-bit |
| DAC Channels | 8 (four stereo pairs) |
| DAC Sample Rate | Up to 192 kHz (DAC 1), 96 kHz (other DACs) |
| DAC Resolution | 24-bit |
| Interface | SPI compatible control port, TDM data pin |
| Package Type | 52-MQFP (10x10) |
| Power Supply | Analog and digital supplies, with recommendation for separate supplies or isolation using ferrite beads |
| Internal Voltage Reference | Provided on FILTR pin, bypassed with 10 μF and 100 nF capacitors |
Key Features
- High-performance digital interpolation filters and decimation filters with 120 dB stop-band attenuation and linear phase response.
- Independently programmable attenuators for each DAC channel, adjustable in 1024 linear steps.
- Stereo replicate feature to copy audio data from the first DAC pair to other DACs.
- Flexible serial interface for glueless connection to DSP chips, AES/EBU receivers, and sample rate converters.
- On-board digital decimation filters with oversampling ratios of 128 (for 48 kHz) or 64 (for 96 kHz).
- Peak level information for each ADC channel available through dedicated registers.
Applications
The AD1837AASZ-REEL is suitable for various professional and consumer audio applications, including:
- Professional audio equipment such as mixers, audio interfaces, and digital recorders.
- Consumer audio devices like home theaters, soundbars, and high-end audio players.
- Automotive audio systems requiring high-quality audio conversion.
- Industrial audio applications where reliability and performance are critical.
Q & A
- What is the maximum sample rate of the ADCs in the AD1837AASZ-REEL? The ADCs can operate at a sample rate of up to 96 kHz.
- How many DAC channels does the AD1837AASZ-REEL have? The device has eight DAC channels, configured as four stereo pairs.
- What is the resolution of the ADC and DAC in the AD1837AASZ-REEL? Both the ADC and DAC have a 24-bit resolution.
- What type of interface does the AD1837AASZ-REEL use for control and data transfer? The device uses an SPI compatible control port and supports TDM data transfer.
- How should the power supplies for the analog and digital sections be managed? It is recommended to use separate supplies for the analog and digital sections or isolate them using ferrite beads if separate supplies are not possible.
- What is the purpose of the internal voltage reference provided on the FILTR pin? The internal voltage reference is used to bias external op-amps to the common-mode voltage of the analog input and output signals and should be bypassed with a parallel combination of 10 μF and 100 nF capacitors.
- Can the AD1837AASZ-REEL be used in cascaded configurations? Yes, the device can be used in cascaded configurations where one device acts as a master and the other as a slave, ensuring synchronized operation.
- What is the stereo replicate feature in the AD1837AASZ-REEL? The stereo replicate feature allows the DAC data sent to the first DAC pair to be copied to the other DACs.
- How are the peak levels of the ADC channels monitored? The peak levels of the ADC channels can be read from the ADC Peak 0 and ADC Peak 1 registers.
- What is the recommended capacitor value for the bulk aluminum electrolytic capacitor on the same PC board as the codec? A bulk aluminum electrolytic capacitor of at least 22 μF should be provided on the same PC board as the codec.
