SPC41A Sunplus Technology Co., Ltd., SPC41A Datasheet - Page 12

• Manufacturer Part Number: SPC41A
• Description: 40KB SOUND CONTROLLER
• Manufacturer: Sunplus Technology Co., Ltd.

8.3. Current Mode DAC Speaker Driver
Figure 1:The simplest CKT uses a low impedance speaker. It has high operation current, but lowest 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 always 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 has more stable and lower operation current than Figure 1-3.
Figure 6: High quality, low operation current CKT, but more expensive.
© Sunplus Technology Co., Ltd.
Proprietary & Confidential
C1: 0.1 µ F ~ 1 µF
RB2: ~ 1K
RB1: 2K~10K C1: 1 µ F~10 µF
RB1: 680 ~ 1.5K
RB1: ~ 360 Ω (Vol)
RE1: ~ 4.7 Ω
AUD
RB2
1N4148
AUD
AUD
C1
C1
Figure 3
Figure 5
Figure 1
C2: ~ 0.1 µF
RB1
C2
4Ω ~ 8Ω
4Ω~64 Ω
RB1
VDD
RB1
8050
RE1
VDD
4Ω ~64 Ω
VDD
8050
8050
AUDP
RB2: ~ 1K
RB1: 2K~10K C1: 1 µF~10 µF
12
C1: 0.1 µ F ~ 1 µF
RB1: 10K ~ 50K
RB2: 820 ~ 1.5K
RB1
AUD
Enable
AUD
RB2
RB2
C2: ~ 0.1 µF
20K
RB1
3
2
Figure 6
Figure 4
Figure 2
C1
LM386
RB1
Power
32Ω ~ 64 Ω
C1
4
6
7
4Ω~8Ω
5
0.1µF
C2
0.01 µF
220 µF
VDD
10
8050
VDD
SPC41A
8050
SEP. 04, 2001
Version: 1.8