SPC21A1 데이터 시트보기 (PDF) - Unspecified
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SPC21A1 Datasheet PDF : 12 Pages
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Current Mode DAC Speaker Driver
C1: 0.1Á F ~ 1Á F
RB1: 680 ~ 1.5K
VDD
ÄÂÃ ~ 8Â
AUD
C1
RB1
8050
Figure 1
RB1: 2K~10K; C1: 1 Á F~10Á F
RB2: ~1K; C2: ~0.1 Á F
VDD
ÄÂÃ ~ 64Â
C2
AUD
RB2
RB1
C1
Figure 3
VDD
8050
RB1: ~ 360ÂÃ (Vol)
RB2: ~ 4.7Â
AUD
1N4148
RB1
Figure 5
ÄÂÃ ~ 64Â
8050
RE1
SPC21A1
RB1: 10K ~ 50K
RB2: 820 ~ 1.5K
C1: 0.1Á F ~ 1Á F
VDD
32ÂÃ ~ 64Â
AUD
RB2
RB1
C1
8050
Figure 2
RB1: 2K~10K; C1: 1 Á F~10Á F
RB2: ~1K; C2: ~0.1 Á F
VDD
Enable RB1
ÄÂÃ ~ 8Â
AUD
RB2
C2
C1
8050
Figure 4
AUDP
RB1
Power
3
6
220Á F
5
LM386
2
7
4
10
0.1Á F
20K
0.01Á F
Figure 6
Figure 1:The simplest CKT uses with low impedance speaker. It has high operation current, but low cost.
Figure 2:It is the same as Figure 1 but a high impedance speaker is used.
Figure 3:The CKT contains a low pass filter. It is capable of providing higher speech quality, but it takes higher
operation current.
Figure 4:Improved version of Figure 3. The standby current can be controlled by the enable pin.
Figure 5:The current mirror mode. It is able to control the volume. In addition, it is more stable and has lower
operation current than Figure 1-3.
Figure 6:High quality, low operation current CKT, but more expensive.
Sunplus Technology Co., Ltd.
10
Rev.: 1.1 1999.11.19
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