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Details, datasheet, quote on part number:LM4842MHX
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| Part: | LM4842MHX |
| Category: | Multimedia => Audio => Amplifiers => Power Amplifiers => Boomer Audio Power Amplifiers |
| Description: | LM4842 - Stereo 2W Amplifiers With DC Volume Control, Transient-free Outputs, And Cap-less Headphone Drive, Package: Llp, Pin Nb=28 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4842MHX datasheet File size : 1338 kB |
| Request For quote: | Find where to buy LM4842MHX
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Datasheet text preview:
LM4842 Stereo 2W Amplifiers with DC Volume Control, Transient Free Outputs, and Cap-less Headphone Drive
September 2002
LM4842 Stereo 2W Amplifiers with DC Volume Control, Transient Free Outputs, and Cap-less Headphone Drive
General Description
The LM4842 is a monolithic integrated circuit that provides DC volume control, and stereo bridged audio power amplifiers capable of producing 2W into 4 (Note 1) or 2.2W into 3 (Note 2) with less than 1.0% THD+N. Boomer ® audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external components. The LM4842 incorporates a DC volume control, stereo bridged audio power amplifiers, new cap-less headphone driver circuit (patent pending), selectable gain or bass boost, and an input mux making it optimally suited for multimedia monitors, portable radios, desktop, and portable computer applications. The LM4842 features an externally controlled, low-power consumption shutdown mode (Shutdown Low), and both a power amplifier and headphone mute for maximum system flexibility and performance.
Note 1: When properly mounted to the circuit board, the LM4842MH will deliver 2W into 4. The LM4842MT will deliver 1.1W into 8. See the Application Information section for LM4842MH usage information. Note 2: An LM4842MH that has been properly mounted to the circuit board and forced-air cooled will deliver 2.2W into 3.
Key Specifications
n PO at 1% THD+N n into 3 (MH and LQ) n into 4 (MH and LQ) n into 8 (MT, MH, and LQ) n Single-ended THD+N at 85mW into 32 n Shutdown current (Shutdown Low) 2.2W(typ) 2.0W(typ) 1.1W(typ) 1.0%(typ) 0.2µA(typ)
Features
n Stereo headphone amplifier mode that eliminates the Output Coupling Capacitors (patent pending) n Advanced "click and pop" suppression circuitry n Acoustically Enhanced DC Volume Control Taper n 2 Channel Stereo Input MUX n System Beep Detect n Stereo switchable bridged/single-ended power amplifiers n Selectable internal/external gain and bass boost n Thermal shutdown protection circuitry
Applications
n Portable and Desktop Computers n Multimedia Monitors n Portable Radios, PDAs, and Portable TVs
Connection Diagrams
TSSOP Package
20028102
Top View Order Number LM4842MT See NS Package Number MTC28 for TSSOP Order Number LM4842MH See NS Package Number MXA28A for Exposed-DAP TSSOP
Boomer ® is a registered trademark of NationalSemiconductor Corporation.
© 2002 National Semiconductor Corporation
DS200281
www.national.com
LM4842
Connection Diagrams
(Continued) LM4842LQ Pinout
200281A3
Top View Order Number LM4842LQ See NS Package Number LQA028AA for Exposed-DAP LLP
www.national.com
2
Block Diagram
LM4842
3
20028192
www.national.com
FIGURE 1. Typical Application Circuit
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