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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  
HP/LINE OPERATION  
The HP/LINE input controls the internal input multiplexer (MUX). Refer to the block diagram in Figure 3. This  
allows the device to switch between two separate stereo inputs to the amplifier. For design flexibility, the  
HP/LINE control is independent of the output mode, SE or BTL, which is cotrolled by the aforementioned  
SE/BTL pin. To allow the amplifier to switch from the LINE inputs to the HP inputs when the output switches  
from BTL mode to SE mode, simply connect the SE/BTL control input to the HP/LINE input.  
When this input is logic high, the RHPIN and LHPIN inputs are selected. When this terminal is logic low, the  
RLINEIN and LLINEIN inputs are selected. This operation is also detailed in Table 3 and the trip levels for a  
logic low (VIL) or logic high (VIH) can be found in the recommended operating conditions table.  
Table 3. HP/LINE, SE/BTL, and Shudown Functions  
INPUTS (1)  
SE/BTL  
X
AMPLIFIER STATE  
INPUT OUTPUT  
HP/LINE  
X
SHUTDOWN  
Low  
X
MUTE  
BTL  
SE  
Low  
Low  
High  
LINE  
LINE  
HP  
Low  
High  
High  
High  
High  
Low  
High  
BTL  
SE  
High  
High  
HP  
(1) Inputs should never be left unconnected  
SHUTDOWN MODES  
The SM7511 employs a shutdown mode of operation designed to reduce supply current (IDD) to the absolute  
minimum level during periods of nonuse for battery-power conservation. The SHUTDOWN input terminal should  
be held high during normal operation when the amplifier is in use. Pulling SHUTDOWN low causes the outputs  
to mute and the amplifier to enter a low-current state, IDD= 20μA. SHUTDOWN should never be left  
unconnected because amplifier operation would be unpredictable.  
FADE OPERATION  
For design flexibility, a fade mode is provided to slowly ramp up the amplifier gain when coming out of  
shutdown mode and conversely ramp the gain down when going into shutdown. This mode provides a smooth  
transition between the active and shutdown states and virtually eliminates any pops or clicks on the outputs.  
When the FADE input is a logic low, the device is placed into fade-on mode. A logic high on this pin places the  
amplifier in the fade-off mode. The voltage trip levels for a logic low (VIL) or logic high (VIH) can be found in the  
recommended operating conditions table.  
When a logic low is applied to the FADE pin and a logic low is then applied on the SHUTDOWN pin, the  
channel gain steps down from gain step to gain step at a rate of two clock cycles per step. With a nominal  
internal clock frequency of 58Hz, this equates to 34 ms per step. The gain steps down until the lowest gain step  
is reached. The time it takes to reach this step depends on the gain setting prior to placing the device in  
shutdown. For example, if the amplifier is in the highest gain mode of 20 dB, the time it takes to ramp down the  
channel gain is 1.05 seconds. This number is calculated by taking the number of steps to reach the lowest gain  
from the highest gain, or 31 steps, and multiplying by the time per step, or 34 ms.  
V.1.3 Revised April 02,2007  
Page 11