dac3555a Micronas, dac3555a Datasheet - Page 8

• Manufacturer Part Number: dac3555a
• Description: Stereo Audio Dac
• Manufacturer: Micronas

DAC 3555A
Fig. 2–2: 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:
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 10...47-
both channels. If a loudspeaker is connected to these
outputs, 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 amplifi-
ers 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. 2–2. Never use
a separate connector for the speaker, because electro-
static discharge could damage the output transistors.
8
AVSS
75 dB... 54 dB:
54 dB...+18 dB: 1.5 dB step size
from switch matrix
+
VREF
AGNDC
3.3 F/100 nF
3 dB step size
FOUTL
FOUTR
DEEML
DEEMR
For external components
see section “Applications”
For external components
see section “Applications”
serial resistors in
FOPL
FOPR
-
-
optional line-out
,
,
FINR
FINL
Table 2–1: Volume Control
-
-
Volume/dB
18.0
16.5
15.0
13.5
0.0
Mute
54.0
57.0
75
1.5
10
10
+
+
OUTL
OUTR
…
…
47
47
1.5 k
1.5 k
PRELIMINARY DATA SHEET
to mC (HP-switch)
AVOL
111000
110111
110110
110101
101100 (default)
101011
001000
000111
000001
000000
AVDD
Speaker
Headphones
>16
>10
@5 V
@3 V
16
Micronas
…
32
AVDD
AVDD