UDA1351TS データシートの表示（PDF） - Philips Electronics
部品番号
コンポーネント説明
メーカー
UDA1351TS Datasheet PDF : 28 Pages
| |||
Philips Semiconductors
96 kHz IEC 958 audio DAC
Preliminary specification
UDA1351TS
handbook, halfpage
75 Ω
10 nF SPDIF 13
180 pF
UDA1351TS
MGU034
Fig.4 IEC 958 input circuit and typical application.
The extracted key parameters are:
• Pre-emphasis
• Audio sample frequency
• Two-channel PCM indicator
• Clock accuracy.
Both the lock indicator and the key channel status bits are
accessible via the L3 interface.
The UDA1351TS supports the following sample
frequencies and data bit rates:
fs = 32.0 kHz, resulting in a data rate of 2.048 Mbits/s
fs = 44.1 kHz, resulting in a data rate of 2.8224 Mbits/s
fs = 48.0 kHz, resulting in a data rate of 3.072 Mbits/s
fs = 64.0 kHz, resulting in a data rate of 4.096 Mbits/s
fs = 88.2 kHz, resulting in a data rate of 5.6448 Mbits/s
fs = 96.0 kHz, resulting in a data rate of 6.144 Mbits/s.
The UDA1351TS supports timing levels I, II and III, as
specified by the IEC 958 standard.
8.4.2 AUDIO FEATURE PROCESSOR
The audio feature processor automatically provides
de-emphasis for the IEC 958 data stream in the static pin
control mode and default mute at start-up in the L3 control
mode.
When used in the L3 control mode, it provides the
following additional features:
• Volume control, using 6 bits
• Bass boost control, using 4 bits
• Treble control, using 2 bits
• Mode selection of the sound processing bass boost and
treble filters: flat, minimum and maximum
• Soft mute control with raised cosine roll-off
• De-emphasis selection of the incoming data stream for
fs = 32.0, 44.1 and 48.0 kHz.
8.4.3 INTERPOLATOR
The UDA1351TS includes an on-board interpolating filter
which converts the incoming data stream from 1fs to 128fs
by cascading a recursive filter and a FIR filter.
Table 2 Interpolator characteristics
PARAMETER CONDITIONS
Pass-band ripple
Stop band
Dynamic range
DC gain
0 to 0.45fs
>0.65fs
0 to 0.45fs
−
VALUE (dB)
±0.03
−50
115
−3.5
8.4.4 NOISE SHAPER
The third-order noise shaper operates at 128fs. It shifts
in-band quantization noise to frequencies well above the
audio band. This noise shaping technique enables high
signal-to-noise ratios to be achieved. The noise shaper
output is converted to an analog signal using a filter stream
DAC.
8.4.5 THE FILTER STREAM DAC (FSDAC)
The FSDAC is a semi-digital reconstruction filter that
converts the 1-bit data stream of the noise shaper to an
analog output voltage. The filter coefficients are
implemented as current sources and are summed at
virtual ground of the output operational amplifier. In this
way, very high signal-to-noise performance and low clock
jitter sensitivity is achieved. A post-filter is not needed due
to the inherent filter function of the DAC. On-board
amplifiers convert the FSDAC output current to an output
voltage signal capable of driving a line output.
The output voltage of the FSDAC is scaled proportionally
with the power supply voltage.
2000 Mar 28
9
Share Link: 