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參數(shù)資料
| 型號： | UAC3552A |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | 消費家電 |
| 英文描述： | Universal Serial Bus |
| 中文描述： | SPECIALTY CONSUMER CIRCUIT, PQFP44 |
| 封裝： | METRIC, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 13/28頁 |
| 文件大?。?/td> | 337K |
| 代理商： | UAC3552A |
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PRELIMINARY DATA SHEET
UAC 3552A
Micronas
13
2.2.2.5. Bass Boost Control
The bass boost algorithm provides an additional 12-dB
gain for the low-frequency components. The character-
istic is shown in Fig. 2
–
6.
Fig. 2
–
6:
Bass boost
The bass boost works on both channels and can be
switched on and off under USB control.
2.2.2.6. Parametric Equalizer
The parametric equalizer is a non-USB audio feature.
It allows the compensation of unwanted frequency
responses of a speaker. Alternatively, frequency
responses can be set to suit individual tastes. The
equalizer consists of 5 individually adjustable bands.
The control parameters and the parameter range for
each band is shown in Table 2
–
6.
The adjustment of the equalizer is supported by an
application program that allows to set up frequency
responses and to download the corresponding filter
coefficients into the UAC 3552A. When the frequency
response fits the target, it can be programmed into the
on-chip EEPROM. The UAC 3552A is shipped with a
flat frequency response.
2.2.2.7. Volume and Balance Control
The volume and balance control operate separately on
the left and right channel.
The volume control is realized in the analog back-end.
This preserves high audio quality (SNR) at low volume
settings because signal and noise are attenuated in
the same way, which is not the case for pure digital vol-
ume control. The UAC 3552A uses digital volume con-
trol only for the fine tuning of the 0.5 dB step size. The
volume setting is smoothed by an internal ramping
algorithm in order to avoid audible clicks during volume
change.
The splitting between analog and digital volume is han-
dled by the UAC 3552A automatically.
2.2.3. Mute Control
The mute control is part of the volume system in the
UAC 3552A. It functions simultaneously on both chan-
nels and can be switched on and off under USB con-
trol. As with the volume control, clicks are avoided by a
ramping algorithm.
2.2.3.1. Oversampling
The oversampling filter increases the audio sampling
rate by a factor of 4. The final upsampling to the noise-
shaping rate is handled by a sample and hold circuit.
The pass-band characteristic of the oversampling filter
is shown in Fig. 2
–
7.
Fig. 2
–
7:
1 to 4 Oversampling filter, pass-band
Table 2
–
6:
Equalizer Parameters
Parameter
Min
Max
center frequency
50 Hz
15 kHz
gain/attenuation
6 dB
+6 dB
filter quality (Q)
0.5
3
Hz
dB
10.
20.
50.
100.
200.
500.
1000.
0
2
4
6
8
10
12
14
Table 2
–
7:
Volume and Balance Control
Min
Max
Step
75 dB
0 dB
0.5 dB
0
5000
10000
15000
20000
-0.5
-0.4
-0.3
-0.2
-0.1
0
kHz
dB
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