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SM7511 参数 Datasheet PDF下载

SM7511图片预览
型号: SM7511
PDF下载: 下载PDF文件 查看货源
内容描述: 具有高级DC音量控制3W立体声音频功率放大器 [3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL]
分类和应用: 放大器功率放大器
文件页数/大小: 23 页 / 2589 K
品牌: SAMHOP [ SAMHOP MICROELECTRONICS CORP. ]
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SAMHOP Microelectronics Corp.  
3W STEREO AUDIO POWER AMPLIFIER WITH ADVANCED DC VOLUME CONTROL  
SE/BTL OPERATION  
The ability of the SM7511 to easily switch between BTL and SE modes is one of its most important cost saving  
features. This feature eliminates the requirement for an additional headphone amplifier in applications where  
internal stereo speakers are driven in BTL mode but external headphone or speakers must be accommodated.  
Internal to the SM7511, two separate amplifiers drive OUT+ and OUT-. The SE/BTL input controls the operation  
of the follower amplifier that drives LOUT- and ROUT-. When SE/BTL is held low, the amplifier is on and the  
SM7511 is in the BTL mode. When SE/BTL is held high, the OUT- amplifiers are in a high output impedance  
state, which configures the SM7511 as an SE driver from LOUT+ and ROUT+. IDD is reduced by approximately  
one-third in SE mode. Control of the SE/BTL input can be from a logic-level CMOS source or, more typically,  
from a resistor divider network as shown in Figure 3. The trip level for the SE/BTL input can be found in the  
recommended operating condition table.  
APPLICATION INFORMATION (continued)  
4
RHPIN  
R
MUX  
5
RLINEIN  
_
+
_
+
ROUT+  
24  
22  
6
Input  
MUX  
Control  
HP/LINE  
RIN  
BYP  
VDD  
100KΩ  
Co  
BYP  
330μF  
_
+
+
_
2
ROUT-  
SE/BTL  
1KΩ  
EN  
100KΩ  
23  
BYP  
LOUT+  
Figure 3. SM7511 Resistor Divider Network Circuit  
Using a 1/8-in. (3,5mm) stereo headphone jack, the control switch is closed when no plug is inserted. When  
closed the 100K/1Kdivider pulls the SE/BTL input low. When a plug is inserted, the 1Kresistor is  
disconnected and SE/BTL input is pulled high. When the input goes high, the OUT- amplifier is shut down  
causing the speaker to mute (open-circuits the speaker). The OUT+ amplifier then drives through the output  
capacitor (CO) into the headphone jack.  
V.1.3 Revised April 02,2007  
Page 10