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UDA1351

96 kHz IEC 958 audio DAC

Philips Electronics 

Philips Semiconductors

96 kHz IEC 958 audio DAC

Preliminary specification

UDA1351H

1 FEATURES

1.1 General

• 2.7 to 3.6 V power supply

• Integrated digital filter and Digital-to-Analog

Converter (DAC)

• Master-mode data output interface for off-chip sound

processing

• 256fs system clock output

• 20-bit data-path in interpolator

• High performance

• No analog post filtering required for DAC

• Supports sampling frequencies from 28 up to 100 kHz

• The UDA1351H is fully pin and function compatible with

the UDA1350AH.

1.2 Control

• Controlled either by means of static pins or via the

L3 microcontroller interface.

1.3 IEC 958 input

• On-chip amplifier for converting IEC 958 input to CMOS

levels

• Selectable IEC 958 input channel, one out of two

• Lock indication signal available on pin LOCK

• Lock indication signal combined on-chip with the Pulse

Code Modulation (PCM) status bit; in case non-PCM

has been detected pin LOCK indicates out-of-lock

• Key channel-status bits available via L3 interface (lock,

pre-emphasis, audio sample frequency, 2 channel PCM

indication and clock accuracy).

1.4 Digital output and input interfaces

• When the UDA1351H is clock master of the data output

interfaces:

– BCKO and WSO signals are output

– I2S-bus or LSB-justified 16, 20 and 24 bits formats

are supported.

• When the UDA1351H is clock slave of the data input

interface:

– BCK and WS signals are input

– I2S-bus or LSB-justified 16, 20 and 24 bits formats

are supported.

1.5 Digital sound processing and DAC

• Pre-emphasis information of IEC 958 input bitstream

available in L3 interface register and on pins

• Automatic de-emphasis when using IEC 958 input with

32.0, 44.1 and 48.0 kHz audio sample frequencies

• Soft mute by means of a cosine roll-off circuit selectable

via pin MUTE or the L3 interface

• Interpolating filter (fs to 128fs) by means of a cascade of

a recursive filter and a FIR filter

• Third-order noise shaper operating at 128fs generates

bitstream for the DAC

• Filter stream digital-to-analog converter.

2 APPLICATIONS

• Digital audio systems.

3 GENERAL DESCRIPTION

The UDA1351H is a single chip IEC 958 audio decoder

with an integrated stereo digital-to-analog converter

employing bitstream conversion techniques.

Besides the UDA1351H, which is the full featured version

in QFP44 package, there also exists the UDA1351TS.

The UDA1351TS has IEC 958 input to the DAC only and

is in SSOP28 package.

The UDA1351H can operate in various operating modes:

• IEC 958 input to the DAC including on-chip signal

processing

• IEC 958 input via the digital data output interface to the

external Digital Signal Processor (DSP)

• IEC 958 input to the DAC and a DSP

• IEC 958 input via a DSP to the DAC including on-chip

signal processing

• External source data input to the DAC including on-chip

signal processing.

2000 Feb 18

3

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