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UDA1350AH

IEC 958 audio DAC

Philips Electronics 

Philips Semiconductors

IEC 958 audio DAC

Preliminary specification

UDA1350AH

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.

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, two channel

PCM indication and clock accuracy).

1.4 Digital output and input interfaces

• When the UDA1350AH is clock master of the data

output interface:

– BCKO and WSO signals are output

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

are supported.

• When the UDA1350AH 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

Available in two versions:

• UDA1350AH:

– Full featured version in QFP44 package.

• UDA1350ATS:

– Only IEC 958 input to DAC in SSOP28 package.

The UDA1350AH is a single chip IEC 958 audio decoder

with an integrated stereo digital-to-analog converter

employing bitstream conversion techniques.

1999 Dec 16

3

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