Datasheet
Table Of Contents
- Features
- Applications
- Key Specifications
- Description
- Description (Continued)
- Absolute Maximum Ratings
- Operating Ratings
- Electrical Characteristics VDD = 5.0V
- Electrical Characteristics VDD = 3.3V
- Electrical Characteristics VDD = 3.0V
- Electrical Characteristics VDD = 2.4V
- Typical Performance Characteristics
- Typical Performance Characteristics LM4911/LM4911Q Specific Characteristics
- Application Information
- AMPLIFIER CONFIGURATION EXPLANATION
- OUTPUT CAPACITOR vs. CAPACITOR COUPLED
- MODE SELECT DETAIL
- POWER DISSIPATION
- EXPOSED-DAP PACKAGE PCB MOUNTING CONSIDERATIONS
- POWER SUPPLY BYPASSING
- MICRO POWER SHUTDOWN
- MUTE
- PROPER SELECTION OF EXTERNAL COMPONENTS
- SELECTION OF INPUT CAPACITOR SIZE
- AUDIO POWER AMPLIFIER DESIGN
- ESD PROTECTION
LM4911, LM4911Q
SNAS152M –MAY 2004–REVISED JUNE 2011
www.ti.com
The circuit shown in Figure 62 presents an applications solution to the problem of using different supply voltages
with different turn-on times in a system with the LM4911/LM4911Q. This circuit shows the LM4911/LM4911Q
with a 25-50kΩ pull-up resistor connected from the shutdown pin to V
DD
. The shutdown pin of the
LM4911/LM4911Q is also being driven by an open drain output of an external microcontroller on a separate
supply. This circuit ensures that shutdown is disabled when powering up the LM4911/LM4911Q by either
allowing shutdown to be high before the LM4911/LM4911Q powers on (the microcontroller powers up first) or
allows shutdown to ramp up with V
DD
(the LM4911/LM4911Q powers up first). This will ensure the
LM4911/LM4911Q powers up properly and enters the correct mode of operation (cap-coupled or OCL).
Figure 62. Recommended Circuit for Different Supply Turn-On Timing
Figure 63. Turn-On, Shutdown, and Mute Timing for Cap-Coupled Mode
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