UDA1321 datasheet(2/44 Pages) PHILIPS

2 / 44 page

1998 Oct 06

Philips Semiconductors

Preliminary speciﬁcation

Universal Serial Bus (USB)

Digital-to-Analog Converter (DAC)

UDA1321

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.

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 I2S-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.

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 bus, performs an

extensive error detection and separates control

information (input and output) and audio information (input

only).

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