SPC41B2 Sunplus Technology Co., Ltd., SPC41B2 Datasheet - Page 11

• Manufacturer Part Number: SPC41B2
• Description: 40KB SOUND CONTROLLER
• Manufacturer: Sunplus Technology Co., Ltd.

8.2. Current Mode DAC Speaker Driver
Figure 1: The simplest CKT uses a low impedance speaker. It has high operation current, but has 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 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
RB1: 2K~10K; C1: 1 µ F~10µ F
RB2: ~1K;
RB1: ~ 360Ω (Vol)
RB2: ~ 4.7Ω
AUD
RB2
AUD
1N4148
C1: 0.1µ F ~ 1µ F
RB1: 680 ~ 1.5K
AUD
C2: ~0.1 µ F
C1
Figure 5
Figure 1
Figure 3
C1
RB1
C2
4Ω ~ 8Ω
4Ω ~ 64Ω
RB1
VDD
RB1
8050
RE1
VDD
4Ω ~ 64Ω
VDD
8050
8050
11
AUDP
RB1
RB1: 2K~10K; C1: 1 µ F~10µ F
RB2: ~1K;
AUD
AUD
Enable
RB1: 10K ~ 50K
RB2: 820 ~ 1.5K
C1: 0.1µ F ~ 1µ F
RB2
RB2
20K
C2: ~0.1 µ F
RB1
3
2
RB1
Figure 2
Figure 4
Figure 6
LM386
Power
C1
4
C1
32Ω ~ 64Ω
6
7
5
0.1µ F
4Ω ~ 8Ω
C2
0.01µ F
220µ F
SPC41B2
VDD
10
8050
VDD
SEP. 05, 2001
8050
Version: 1.3