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LM4840MT 데이터시트 PDF




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부품번호 LM4840MT 기능
기능 Stereo 2W Audio Power Amplifiers with Digital Volume Control and Input Mux
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LM4840MT 데이터시트, 핀배열, 회로
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 am-
plifiers 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 us-
age 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 321.0%
(typ)
n Shutdown current
0.2µA (typ)
Features
n PC98 and PC99 Compliant
n Digital Volume Control Interface
n System Beep Detect
n Stereo switchable bridged/single-ended power amplifiers
n “Click and pop” suppression circuitry
n Thermal shutdown protection circuitry
n Input Mux
n Capless headphone drivers
n 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
www.national.com




LM4840MT pdf, 반도체, 판매, 대치품
Electrical Characteristics for Single-Ended Mode Operation (Continued)
(Notes 7, 10)
The following specifications apply for VDD = 5V. Limits apply for TA = 25˚C.
Symbol
Parameter
Conditions
THD+N
PSRR
SNR
Xtalk
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Signal to Noise Ratio
Channel Separation
VOUT = 1VRMS, f=1kHz, RL = 10k,
AVD = 1
CB = 1.0 µF, f =120 Hz,
VRIPPLE = 200 mVrms
POUT =75 mW, R L = 32, A-Wtd
Filter
f=1kHz, CB = 1.0 µF
LM4840
Typical
(Note 14)
Limit
(Note 15)
0.065
58
102
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.
Symbol
Parameter
Conditions
LM4840
Typical
(Note 14)
Limit
(Note 15)
Units
(Limits)
VOS Output Offset Voltage
PO Output Power
VIN = 0V, No Load
THD + N = 1.0%; f=1kHz; RL = 3
(Note 8)
5
2.2
50 mV (max)
W
THD + N = 1.0%; f=1kHz; RL = 4
(Note 9)
2
W
THD+N
PSRR
SNR
Total Harmonic Distortion+Noise
Power Supply Rejection Ratio
Signal to Noise Ratio
THD = 1.5% (max);f = 1 kHz;
RL = 8
THD+N = 10%;f = 1 kHz; RL = 8
PO = 1W, 20 Hz< f < 20 kHz,
RL = 8, AVD = 2
PO = 340 mW, RL = 32
CB = 1.0 µF, f = 120 Hz,
VRIPPLE = 200 mVrms; RL = 8
VDD = 5V, POUT = 1.1W, RL = 8,
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 3loads from a 5V supply the LM4840LQ and LM4840MH must be mounted to the circuit board and forced-air cooled.
Note 9: When driving 4loads from a 5V supply the LM4840LQ and LM4840MH 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. Marshall Chiu feels there are better ways to obtain ’More
Wattage in the Cottage.’ 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 LM4840LQ and LM4840MT, TJMAX = 150˚C, and the typical junction-to-ambient thermal
resistance, when board mounted, is 80˚C/W for the MTC28 package and 42˚C/W for the LM4840LQ package.
Note 12: Human body model, 100 pF discharged through a 1.5 kresistor.
Note 13: Machine Model, 220 pF–240 pF discharged through all pins.
Note 14: Typicals are specified at 25˚C and represent the parametric norm.
Note 15: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 16: Number given is for an LQA028A package whose exposed-DAP is soldered to an exposed 2.5in2 piece of 1 ounce PCB copper.
www.national.com
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LM4840MT 전자부품, 판매, 대치품
Typical Performance Characteristics (Continued)
THD+N vs Output Power
THD+N vs Output Power
THD+N vs Output Power
DS200104-25
THD+N vs Output Power
DS200104-26
THD+N vs Output Power
DS200104-27
THD+N vs Output Power
DS200104-28
THD+N vs Output Power
DS200104-29
THD+N vs Output Power
DS200104-30
THD+N vs Output Power
DS200104-31
DS200104-32
DS200104-33
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