Overview
The STA120DJ, produced by STMicroelectronics, is a monolithic CMOS digital audio interface receiver. This device is designed to receive and decode audio data according to various professional and consumer digital audio interface standards, including AES/EBU, IEC 958, S/PDIF, and EIAJ CP-340/1201. The STA120DJ features on-chip clock recovery and synchronization, de-multiplexing of audio and digital data, and extensive error reporting capabilities. It supports both differential and single-ended inputs and provides dedicated output pins for channel status, user data, and validity information.
Key Specifications
| Parameter | Value | Unit |
|---|---|---|
| Power Supply Voltage (VD+, VA+) | 3.3V ± 10% | V |
| Input Voltage (excluding pins 9, 10) | -0.3 to VD+ + 0.3 | V |
| Ambient Operating Temperature | -30 to +85 | °C |
| Storage Temperature | -40 to 150 | °C |
| Clock Frequencies | MCK (256xFS), SCK (64xFS), FSYNC (FS or 2xFS) | - |
| Package Type | SO28 | - |
Key Features
- Supports AES/EBU, IEC 958, S/PDIF, and EIAJ CP-340/1201 interface standards
- On-chip clock recovery and synchronization using Phase-Locked Loops (PLL)
- De-multiplexes audio, channel status, user, and validity data to serial output pins
- Differential or single-ended input decoding
- Extensive error reporting and repeat last sample on error option
- Configurable serial port supporting 14 different formats
- Low-jitter clock generation and jitter attenuation
- Multifunction pins for error and frequency information or channel status information
Applications
- Digital audio equipment such as professional audio mixers, audio interfaces, and digital audio workstations
- Consumer audio devices like CD players, DVD players, and home theater systems
- Audio transmission and reception systems in broadcasting and live events
- Audio storage and playback devices requiring precise clock recovery and synchronization
Q & A
- What are the supported digital audio interface standards for the STA120DJ?
The STA120DJ supports AES/EBU, IEC 958, S/PDIF, and EIAJ CP-340/1201 interface standards.
- What is the typical power supply voltage for the STA120DJ?
The typical power supply voltage is 3.3V ± 10% for both the digital and analog sections.
- How does the STA120DJ handle clock recovery and synchronization?
The STA120DJ uses on-chip Phase-Locked Loops (PLL) for clock recovery and synchronization.
- What types of input signals can the STA120DJ decode?
The STA120DJ can decode both differential and single-ended input signals.
- What is the purpose of the multifunction pins on the STA120DJ?
The multifunction pins can be used to display either error and received frequency information or channel status information, selectable by the SEL pin.
- How does the STA120DJ handle errors in the audio data stream?
The STA120DJ provides extensive error reporting and can repeat the last valid audio sample if an error occurs.
- What is the significance of the FSYNC, SCK, and SDATA pins in the audio serial port?
FSYNC delineates the serial data, SCK is the clock signal, and SDATA is the serial data output. These pins are configurable to support various serial port formats.
- Can the STA120DJ operate without a microprocessor?
Yes, the STA120DJ does not require a microprocessor to handle non-audio data, as it has dedicated pins for the most important channel status bits.
- What is the role of the RS422 line receiver in the STA120DJ?
The RS422 line receiver decodes differential inputs and includes a Schmitt trigger to prevent noisy signals from corrupting the phase detector.
- What are some common applications of the STA120DJ?
The STA120DJ is commonly used in digital audio equipment, consumer audio devices, audio transmission and reception systems, and audio storage and playback devices.
