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參數(shù)資料
| 型號： | DAC3550A |
| 廠商： | MICRONAS SEMICONDUCTOR HOLDING AG |
| 元件分類： | DAC |
| 英文描述： | ECONOLINE: RSZ/P - 1kVDC |
| 中文描述： | 32-BIT DAC, PQFP44 |
| 封裝： | METRIC, PLASTIC, QFP-44 |
| 文件頁數(shù)： | 7/35頁 |
| 文件大?。?/td> | 626K |
| 代理商： | DAC3550A |
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DAC 3550A
Micronas
7
Fig. 2
–
5:
Postfilter op amps, deemphasis op amps, and line-out
2.8. Analog Volume
The analog volume control covers a range from
+18 dB to
75 dB. The lowest step is the mute posi-
tion.
Step size is split into a 3-dB and a 1.5-dB range:
75 dB...
54 dB:
54 dB...+18 dB:1.5 dB step size
3 dB step size
2.9. Headphone Amplifier
The headphone amplifier output is provided at the
OUTL and OUTR pins connected either to stereo
headphones or a mono loudspeaker. The stereo head-
phones require external 47-
serial resistors in both
channels. If a loudspeaker is connected to these out-
puts, the power amplifier for the right channel must be
switched to inverse polarity. In order to optimize the
available power, the source of the two output amplifiers
should be identical, i.e. a monaural signal.
Please note, that if a speaker is connected, it should
strictly be connected as shown in Fig. 2
–
5. Never use
a separate connector for the speaker, because electro-
static discharge could damage the output transistors.
FOPL
A
FINL
FOPR
A
I
-
-
-
-
AGNDC
+
VREF
Speaker
Headphones
OUTL
OUTR
1
F
1.5 k
47
1
F
FOUTL
FOUTR
from switch matrix
3.3
μ
F/100 nF
+
+
AVSS
AVDD
32
to
μ
C (HP-switch)
1.5 k
47
optional line-out
DEEML
For external components
,
see section
“
Applications
”
DEEMR
16-32
FINR
For external components
,
see section
“
Applications
”
Table 2
–
1:
Volume Control
Volume/dB
AVOL
18.0
111000
16.5
110111
15.0
110110
13.5
110101
0.0
101100 (default)
1.5
101011
54.0
001000
57.0
000111
75
000001
Mute
000000
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