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參數(shù)資料
| 型號： | SAA7712H |
| 廠商： | NXP SEMICONDUCTORS |
| 元件分類： | 數(shù)字信號處理 |
| 英文描述： | Sound effects DSP(聲音效應(yīng)數(shù)字信號處理器) |
| 中文描述： | 0-BIT, 32.544 MHz, OTHER DSP, PQFP80 |
| 文件頁數(shù)： | 13/44頁 |
| 文件大?。?/td> | 178K |
| 代理商： | SAA7712H |
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1999 Aug 05
13
Philips Semiconductors
Preliminary specification
Sound effects DSP
SAA7712H
8.1.5
P
ERFORMANCE
The signed-magnitude noise-shaped DAC has a dynamic
range in excess of 100 dB. The signal-to-noise ratio of the
audio output at full-scale is determined by the word length
of the converter. The noise at low outputs is fully
determined by the noise performance of the DAC. Since it
is a signed-magnitude type, the noise at digital silence is
also low. As a disadvantage, the total THD is higher than
conventional DACs. The typical total harmonic
distortion-plus-noise to signal ratio as a function of the
output level is shown in Fig.6.
Fig.6
Typical (THD + N)/S curve as a function of
the output level.
handbook, halfpage
80
60
40
0
MGS211
20
60
80
40
(THD
+
N)/S
(dB)
output level (dB)
8.1.6
P
OWER
-O
N
M
UTE
(POM)
To avoid any uncontrolled noise at the audio outputs after
power-on of the IC, the reference current source of the
DAC is switched off. The capacitor on pin POM
determines the time after which this current has a soft
switch-on. So at power-on the current audio signal outputs
are always muted. The loading of the external capacitor is
done in two stages via two different current sources.
The loading starts at a current level that is 9 times lower
than the current loading after the voltage on pin POM has
passed the 1 V level. This results in an almost dB linear
behaviour.
8.1.7
P
OWER
-
OFF PLOP SUPPRESSION
Power should still be provided to the analog part of the
DAC, while the digital part is switching off. As a result, the
output voltage will decrease gradually allowing the power
amplifier some extra time to switch-off without audible
plops. If a 5 V power supply is present, the supply voltage
of the analog part of the DAC can be fed from the 5 V
power supply via a 1.8 V zener diode. A capacitor,
connected to the 3.3 V power supply, provides power to
the analog part when the 5 V power supply is switching off
fast.
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