UDA1350AH

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.

FEATURES

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.

Control

• Controlled either by means of static pins or via the L3 microcontroller interface.

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).

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.

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.

APPLICATIONS

• Digital audio systems.