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Details, datasheet, quote on part number:LM4840LQX
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| Part: | LM4840LQX |
| Category: | Multimedia => Audio => Amplifiers => Power Amplifiers => Boomer Audio Power Amplifiers |
| Description: | LM4840 - Stereo 2W Audio Power Amplifiers With Digital Volume Control And Input Mux, Package: Llp, Pin Nb=28 |
| Company: | National Semiconductor Corporation |
| Datasheet: | Download LM4840LQX datasheet File size : 805 kB |
| Request For quote: | Find where to buy LM4840LQX
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Datasheet text preview:
LM4840 Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux
December 2001
LM4840 Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux
General Description
The LM4840 is a monolithic integrated circuit that provides digital 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 LM4840 incorporates a digital volume control, stereo bridged audio power amplifiers, an input mux, and a last volume level memory function to save the volume setting during shutdown. These features make it optimally suited for multimedia monitors, portable radios, desktop, and portable computer applications. The LM4840 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 LM4840LQ and LM4840MH will deliver 2W into 4. The LM4840MT will deliver 1.1W into 8. See the Application Information section LM4840LQ and for LM4840MH usage information. Note 2: An LM4840LQ and LM4840MH that have 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 (LM4840LQ, LM4840MH) 2.2W (typ) n into 4 (LM4840LQ, LM4840MH) 2.0W (typ) n into 8 (LM4840) 1.1W (typ) n Single-ended mode - THD+N at 85mW into 32 1.0% (typ) n Shutdown current 0.2µA (typ)
Features
n n n n n n n n n PC98 and PC99 Compliant Digital Volume Control Interface System Beep Detect Stereo switchable bridged/single-ended power amplifiers "Click and pop" suppression circuitry Thermal shutdown protection circuitry Input Mux Capless headphone drivers Last volume memory from shutdown
Applications
n Portable and Desktop Computers n Multimedia Monitors n Portable Radios, PDAs, and Portable TVs
Connection Diagram
LLP Package
DS200104-35
Top View Order Number LM4840LQ See NS Package Number LQA028A for Exposed-DAP LLP
Boomer ® is a registered trademark of NationalSemiconductor Corporation.
© 2001 National Semiconductor Corporation
DS200104
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LM4840
Connection Diagram
(Continued) TSSOP Package
DS200104-2
Top View Order Number LM4840MT See NS Package Number MTC28 for TSSOP Order Number LM4840MH See NS Package Number MXA28A for Exposed-DAP TSSOP
Block Diagram
DS200104-1
FIGURE 1. LM4840 Block Diagram
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LM4840
Absolute Maximum Ratings (Note 10)
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
JC (typ) -- LQA028A (Note 16) JA (typ) -- LQA028A (Note 16) JC (typ) -- MTC28 JA (typ) -- MTC28 JC (typ) -- MXA28A JA (typ) -- MXA28A (Note 4) JA (typ) -- MXA28A (Note 3) JA (typ) -- MXA28A (Note 5) JA (typ) -- MXA28A (Note 6)
3°C/W 42°C/W 20°C/W 80°C/W 2°C/W 41°C/W 54°C/W 59°C/W 93°C/W
Operating Ratings
215°C 220°C Temperature Range TMIN TA TMAX Supply Voltage -40°C TA 85°C 2.7V VDD 5.5V
See AN-450 "Surface Mounting and their Effects on Product Reliability" for other methods of soldering surface mount devices. See AN-1187 "Leadless Leadframe Package" for detailed information on usage of LLP 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. LM4840 Symbol VDD IDD ISD VIH VIL Parameter Supply Voltage Quiescent Power Supply Current Shutdown Current Headphone Sense High Input Voltage Headphone Sense Low Input Voltage VIN = 0V, IO = 0A VSHUTDOWN = VDD 12 0.7 Conditions Typical (Note 14) Limit (Note 15) 2.7 5.5 30 2.0 4 0.8 Units (Limits) V (min) V (max) mA (max) µA (max) V (min) V (max)
Electrical Characteristics for Volume Attenuators
(Notes 7, 10) The following specifications apply for VDD = 5V. Limits apply for TA = 25°C. LM4840 Symbol CRANGE AM Parameter Attenuator Range Mute Attenuation Conditions Gain with Digital Volume Max Attenuation with Digital Volume Min VMUTE = VDD, Bridged Mode VMUTE = VDD, Single-Ended Mode Typical (Note 14) 0 -81 -88 -88 Limit (Note 15) Units (Limits) dB (max) dB (min) dB (min) dB (min)
± 0.5
-75 -78 -78
Electrical Characteristics for Single-Ended Mode Operation
(Notes 7, 10) The following specifications apply for VDD = 5V. Limits apply for TA = 25°C. LM4840 Symbol PO Parameter Output Power Conditions THD = 1.0%; f = 1kHz; RL = 32 THD = 10%; f = 1 kHz; RL = 32 Typical (Note 14) 85 95 Limit (Note 15) Units (Limits) mW mW
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