GENERAL DESCRIPTION
The UDA1321 is a stereo CMOS digital-to-analog bitstream converter designed for USB-compliant audio playback devices and multimedia audio applications.The UDA1321 is an adaptive asynchronous  sink USB audio device with a continuous sampling frequency (fs) range from 5 to 55 kHz. It contains a USB interface, an embedded microcontroller and an Asynchronous Digital-to-Analog Converter (ADAC).

FEATURES
General
• Universal Serial Bus (USB) stereo Digital-to-Analog Converter (DAC) system with adaptive (5 to 55 kHz) 20-bits digital-to-analog conversion and filtering
• USB-compliant audio and Human Interface Device(HID)
• Supports 12 Mbits/s full-speed serial data transmission
• Supports multiple audio data formats (8, 16 and 24 bits)
• Supports headphone and line output
• Fully automatic ‘Plug-and-Play’ operation
• High linearity
• Wide dynamic range
• Superior signal-to-noise ratio (typical 95 dB)
• Low total harmonic distortion (typical 90 dB)
• 3.3 V power supply
• Efficient power management
• Low power consumption
• On-chip master clock oscillator, only an external crystal is required
• Partly programmable USB descriptors and configuration via I2C-bus.