Philips Semiconductors
Preliminary specification
Stereo audio codec with SPDIF interface
UDA1355H
• Programmable digital silence detector
which can generate level II output signals with CMOS
levels. In microcontroller mode the UDA1355H offers a
large variety of possibilities for defining signal flows
through the IC, offering a flexible analog, digital and SPDIF
converter chip with possibilities for off-chip sound
processing via the digital input and output interface.
• Interpolating filter (fs to 64fs or fs to 128fs) comprising a
recursive and a FIR filter in cascade
• Selectable fifth-order noise shaper operating at 64fs or
third-order noise shaper operating at 128fs (specially for
low sampling frequencies, e.g. 16 kHz) generating
bitstream for DAC
A lock indicator is available on pin LOCK when the
IEC 60958 decoder and the clock regeneration
mechanism is in lock. By default the DAC output and the
digital data interface output are muted when the decoder
is not in lock.
• Filter Stream DAC (FSDAC)
• In microcontroller mode:
– Left and right volume control (for balance control)
0 to −78 dB and −∞
The UDA1355H contains two clock systems which can run
at independent frequencies, allowing to lock-on to an
incoming SPDIF or digital audio signal, and in the mean
time generating a stable signal by means of the crystal
oscillator for driving, for example, the ADC or SPDIF
output signal.
– Left and right bass boost and treble control
– Optional resonant bass boost control
– Mixing possibility of two data streams.
2
GENERAL DESCRIPTION
Using the crystal oscillator (which requires a 12.288 MHz
crystal) and the on-chip low jitter PLL, all standard audio
sampling frequencies (fs = 32, 44.1 and 48 kHz including
half and double these frequencies) can be generated.
The UDA1355H is a single-chip IEC 60958 decoder and
encoder with integrated stereo digital-to-analog converters
and analog-to-digital converters employing bitstream
conversion techniques.
The UDA1355H has a selectable one-of-four SPDIF input
(accepting level I, II and III timing) and one SPDIF output
3
ORDERING INFORMATION
TYPE
PACKAGE
NUMBER
NAME
DESCRIPTION
VERSION
UDA1355H
QFP44
plastic quad flat package; 44 leads (lead length 1.3 mm); body
SOT307-2
10 × 10 × 1.75 mm
2003 Apr 10
4
NXP [ NXP ]
