UDA1321

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).

The USB interface is the interface between the USB, the ADAC and the microcontroller. The USB interface consists of an analog front-end and a USB processor. The analog front-end transforms the differential USB data to a digital data stream. The USB processor buffers the input and output data from the analog front-end and handles all low-level USB protocols. The USB processor selects the relevant data from the universal serial busperforms an extensive error detection and separates control information (input and output) and audio information (input only).

The control information becomes accessible at the microcontroller. The audio information becomes available at the digital I/O output or is fed directly to the ADAC.

The microcontroller handles the high-level USB protocols translates the incoming control requests and manages the user interface via General Purpose (GP) pins and an I²C-bus.

The ADAC enables the wide and continuous range of input sampling frequencies. By means of a Sample Frequency Generator (SFG)the ADAC is able to reconstruct the average sample frequency from the incoming audio samples. The ADAC also performs the sound processing.

The ADAC consists of FIFO registersa unique audio feature processing DSPthe SFGdigital up-sampling filtersa variable hold registera Noise Shaper (NS) and a Filter Stream DAC (FSDAC) with integrated filter and line output drivers. The audio information is applied to the ADAC via the USB processor or via the digital I/O input.

An external DSP can be used for adding extra sound processing features via the digital I/O-bus.

The UDA1321 supports the standard I²S-bus data input format and the LSB-justified serial data input format with word lengths of 1618 and 20 bits.

The wide dynamic range of the bitstream conversion technique used in the UDA1321 guarantees a high audio sound quality.

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 I²PC-bus.

Sound processing

• Separate digital volume control for left and right channel
• Soft mute
• Digital bass and treble tone control
• External Digital Sound Processor (DSP) option possible via standard I²PS-bus or Japanese digital I/O format
• Selectable clipping prevention
• Selectable Dynamic Bass Boost (DBB)
• On-chip digital de-emphasis.

Document references

• USB Specification
• USB Common Class Specification
• USB Device Class Definition for Audio Devices
• Device Class Definition for Human Interface Devices (HID)
• USB HID Usage Table.

Applications

• USB monitors
• USB speakers
• USB headsets
• USB telephone/answering machines
• USB links in consumer audio devices.

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