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PDF LM4838ITL Data sheet ( Hoja de datos )
| Número de pieza | LM4838ITL | |
| Descripción | Stereo 2W Audio Power Amplifiers with DC Volume Control and Selectable Gain | |
| Fabricantes | National Semiconductor | |
| Logotipo |  |
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January 2003
LM4838
Stereo 2W Audio Power Amplifiers
with DC Volume Control and Selectable Gain
General Description
The LM4838 is a monolithic integrated circuit that provides
DC volume control, and stereo bridged audio power amplifi-
ers capable of producing 2W into 4Ω (Note 1) with less than
1.0% THD or 2.2W into 3Ω (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 LM4838 incorporates a
DC volume control, stereo bridged audio power amplifiers
and a selectable gain or bass boost, making it optimally
suited for multimedia monitors, portable radios, desktop, and
portable computer applications.
The LM4838 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 LM4838LQ and
LM4838MTE will deliver 2W into 4Ω. The LM4838MT and LM4838ITL will
deliver 1.1W into 8Ω. See Application Information section Exposed-DAP
package PCB Mounting Considerations for more information.
Note 2: An LM4838LQ and LM4838MTE that have been properly mounted
to the circuit board and forced-air cooled will deliver 2.2W into 3Ω.
Key Specifications
n PO at 1% THD+N
n into 3Ω (LQ & MTE)
n into 4Ω (LQ & MTE)
n into 8Ω (MT, MTE, ITL, & LQ)
n Single-ended mode - THD+N at 85mW into
32Ω
n Shutdown current
2.2W (typ)
2.0W (typ)
1.1W (typ)
1.0%(typ)
0.7µA (typ)
Features
n DC Volume Control Interface
n System Beep Detect
n Stereo switchable bridged/single-ended power amplifiers
n Selectable internal/external gain and bass boost
n “Click and pop” suppression circuitry
n Thermal shutdown protection circuitry
Applications
n Portable and Desktop Computers
n Multimedia Monitors
n Portable Radios, PDAs, and Portable TVs
Block Diagram
FIGURE 1. LM4838 Block Diagram
Boomer® is a registered trademark of NationalSemiconductor Corporation.
© 2003 National Semiconductor Corporation DS200133
20013301
www.national.com
1 page  
Electrical Characteristics for Single-Ended Mode Operation (Notes 7,
10) (Continued)
The following specifications apply for VDD = 5V. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
THD+N
PSRR
SNR
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Signal to Noise Ratio
VOUT = 1VRMS, f=1kHz, RL = 10kΩ,
AVD = 1
CB = 1.0 µF, f =120 Hz,
VRIPPLE = 200 mVrms
POUT =75 mW, R L = 32Ω, A-Wtd
Filter
LM4838
Typical
(Note 14)
Limit
(Note 15)
0.065
58
102
Xtalk
Channel Separation
f=1kHz, CB = 1.0 µF
65
Units
(Limits)
%
dB
dB
dB
Electrical Characteristics for Bridged Mode Operation (Notes 7, 10)
The following specifications apply for VDD = 5V, unless otherwise noted. Limits apply for TA = 25˚C.
LM4838
Symbol
Parameter
Conditions
Typical
Limit
(Note 14) (Note 15)
VOS Output Offset Voltage
PO Output Power
VIN = 0V, No Load
THD + N = 1.0%; f=1kHz; RL = 3Ω
(Note 8)
5
2.2
±50
Units
(Limits)
mV (max)
W
THD + N = 1.0%; f=1kHz; RL = 4Ω
(Note 9)
2
W
THD+N
PSRR
SNR
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Signal to Noise Ratio
THD = 1% (max);f = 1 kHz;
RL = 8Ω
THD+N = 10%;f = 1 kHz; RL = 8Ω
PO = 1W, 20 Hz< f < 20 kHz,
RL = 8Ω, AVD = 2
PO = 340 mW, RL = 32Ω
CB = 1.0 µF, f = 120 Hz,
VRIPPLE = 200 mVrms; RL = 8Ω
VDD = 5V, POUT = 1.1W, RL = 8Ω,
A-Wtd Filter
1.1
1.5
0.3
1.0
74
93
1.0 W (min)
W
%
%
dB
dB
Xtalk
Channel Separation
f=1kHz, CB = 1.0 µF
70
dB
Note 3: The θJA given is for an MXA28A package whose exposed-DAP is soldered to an exposed 2in 2 piece of 1 ounce printed circuit board copper.
Note 4: The θJA given is for an MXA28A package whose exposed-DAP is soldered to a 2in2 piece of 1 ounce printed circuit board copper on a bottom side layer
through 21 8mil vias.
Note 5: The θJA given is for an MXA28A package whose exposed-DAP is soldered to an exposed 1in 2 piece of 1 ounce printed circuit board copper.
Note 6: The θJA given is for an MXA28A package whose exposed-DAP is not soldered to any copper.
Note 7: All voltages are measured with respect to the ground pins, unless otherwise specified. All specifications are tested using the typical application as shown
in Figure 1.
Note 8: When driving 3Ω loads from a 5V supply the LM4838LQ, LM4838ITL and LM4838MTE must be mounted to the circuit board and forced-air cooled.
Note 9: When driving 4Ω loads from a 5V supply the LM4838LQ, LM4838ITL and LM4838MTE must be mounted to the circuit board.
Note 10: Absolute Maximum Ratings indicate limits beyond which damage to the device may occur. Operating Ratings indicate conditions for which the device is
functional, but do not guarantee specific performance limits. Electrical Characteristics state DC and AC electrical specifications under particular test conditions which
guarantee specific performance limits. This assumes that the device is within the Operating Ratings. Specifications are not guaranteed for parameters where no limit
is given, however, the typical value is a good indication of device performance.
Note 11: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θ JA, and the ambient temperature TA. The maximum
allowable power dissipation is PDMAX = (TJMAX − TA )/θJA. For the LM4838, TJMAX = 150˚C, and the typical junction-to-ambient thermal resistance for each package
can be found in the Absolute Maximum Ratings section above.
Note 12: Human body model, 100 pF discharged through a 1.5 kΩ resistor.
Note 13: Machine Model, 220 pF–240 pF discharged through all pins.
Note 14: Typicals are measured at 25˚C and represent the parametric norm.
Note 15: Limits are guaranteed to National’s AOQL ( Average Outgoing Quality Level). Datasheet min/max specification limits are guaranteed by design, test, or
statistical analysis.
5 www.national.com
5 Page 
Non-MTE Specific Characteristics (Continued)
THD+N vs Output Power
THD+N vs Output Power
THD+N vs Output Power
20013331
THD+N vs Output Power
20013332
THD+N vs Output Voltage
Docking Station Pins
20013333
20013334
THD+N vs Output Voltage
Docking Station Pins
20013359
11
20013360
www.national.com
11 Page | ||
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| PDF Descargar | [ Datasheet LM4838ITL.PDF ] | |
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