|
Details, datasheet, quote on part number:LM4843
| |
| Part: | LM4843 |
| Category: | Analog & Mixed-Signal Processing => Amplifiers => Audio/Power Amplifiers |
| Description: | Stereo 2w Audio Power Amplifiers With DC Volume Control |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4843 datasheet File size : 612 kB |
| Request For quote: | Find where to buy LM4843
|
| |
Datasheet text preview:
LM4843 Stereo 2W Audio Power Amplifiers with DC Volume Control
July 2002
LM4843 Stereo 2W Audio Power Amplifiers with DC Volume Control
General Description
The LM4843 is a monolithic integrated circuit that provides DC volume control, and stereo bridged audio power amplifiers capable of producing 2W into 4 (Note 1) with less than 1.0% THD or 2.2W into 3 (Note 2) with less than 1.0% THD. Boomer ® audio integrated circuits were designed specifically to provide high quality audio while requiring a minimum amount of external components. The LM4843 incorporates a DC volume control with stereo bridged audio power amplifiers making it optimally suited for multimedia monitors, portable radios, desktop, and portable computer applications. The LM4843 features an externally controlled, low-power consumption shutdown mode, and both a power amplifier and headphone mute for maximum system flexibility and performance.
Note 1: When properly mounted to the circuit board, the LM4843MH will deliver 2W into 4. See the Application Information section for LM4843MH usage information. Note 2: LM4843MH 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 n into 4 n into 8 n Shutdown current 2.2W (typ) 2.0W (typ) 1.1W (typ) 0.7µA (typ)
Features
n n n n Acoustically Enhanced DC Volume Control Taper Stereo bridged power amplifiers "Click and pop" suppression circuitry Thermal shutdown protection circuitry
Applications
n Portable and Desktop Computers n Multimedia Monitors n Portable Radios, PDAs, and Portable TVs
Block Diagram
20038389
FIGURE 1. LM4843 Block Diagram
Boomer ® is a registered trademark of NationalSemiconductor Corporation.
© 2002 National Semiconductor Corporation
DS200383
www.national.com
LM4843
Connection Diagram
Standard LM4843MH
20038387
Top View Order Number LM4843MH See NS Package Number MXA20
www.national.com
2
LM4843
Absolute Maximum Ratings
(Note 10)
JC (typ) -- MXA20A JA (typ) -- MXA20A (exposed DAP) (Note 4) JA (typ) -- MXA20A (exposed DAP) (Note 3) JA (typ) -- MXA20A (exposed DAP) (Note 5) JA (typ) -- MXA20A (exposed DAP) (Note 6)
2°C/W 41°C/W 54°C/W 59°C/W 93°C/W
If Military/Aerospace specified devices are required, please contact the National Semiconductor Sales Office/ Distributors for availability and specifications. Supply Voltage Storage Temperature Input Voltage Power Dissipation ESD Susceptibility (Note 12) ESD Susceptibility (Note 13) Junction Temperature Soldering Information Small Outline Package Vapor Phase (60 sec.) Infrared (15 sec.) 6.0V -65°C to +150°C -0.3V to VDD +0.3V Internally limited 2000V 200V 150°C
Operating Ratings
Temperature Range TMIN TA TMAX Supply Voltage -40°C TA 85°C 2.7V VDD 5.5V
215°C 220°C
See AN-450 "Surface Mounting and their Effects on Product Reliability" for other methods of soldering surface mount devices.
Electrical Characteristics for Entire IC
(Notes 7, 10) The following specifications apply for VDD = 5V unless otherwise noted. Limits apply for TA = 25°C. LM4843 Symbol VDD IDD ISD Parameter Supply Voltage Quiescent Power Supply Current Shutdown Current VIN = 0V, IO = 0A Vshutdown = VDD 15 0.7 Conditions Typical (Note 14) Limit (Note 15) 2.7 5.5 30 2.0 Units (Limits) V (min) V (max) mA (max) µA (max)
Electrical Characteristics for Volume Attenuators
(Notes 7, 10) The following specifications apply for VDD = 5V. Limits apply for TA = 25°C. LM4843 Symbol CRANGE AM Parameter Attenuator Range (Note 16) Mute Attenuation Conditions Attenuation with VDCVol = 5V, No Load Attenuation with VDCVol = 0V Vmute = 5V, Bridged Mode (BM) Typical (Note 14) Limit (Note 15) Units (Limits) dB (max) dB (min) dB (min)
± 0.75
-75 -78
3
www.national.com
|
|
