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LM4941 데이터시트 PDF




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부품번호 LM4941 기능
기능 1.25 Watt Fully Differential Audio Power Amplifier
제조업체 National Semiconductor
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LM4941 데이터시트, 핀배열, 회로
www.DataSheet4U.com
June 2006
LM4941
1.25 Watt Fully Differential Audio Power Amplifier With
RF Suppression and Shutdown
General Description
The LM4941 is a fully differential audio power amplifier
primarily designed for demanding applications in mobile
phones and other portable communication device applica-
tions. It is capable of delivering 1.25 watts of continuous
average power to a 8load with less than 1% distortion
(THD+N) from a 5VDC power supply. The LM4941 does not
require output coupling capacitors or bootstrap capacitors,
and therefore is ideally suited for mobile phone and other low
voltage applications where minimal power consumption is a
primary requirement.
The LM4941 also features proprietary internal circuitry that
suppresses the coupling of RF signals into the chip. This is
important because certain types of RF signals (such as
GSM) can couple into audio amplifiers in such a way that
part of the signal is heard through the speaker. The RF
suppression circuitry in the LM4941 makes it well-suited for
portable applications in which strong RF signals generated
by an antenna from or a cellular phone or other portable
electronic device may couple audibly into the amplifier.
Other features include a low-power consumption shutdown
mode, internal thermal shutdown protection, and advanced
pop & click circuitry.
Key Specifications
j Improved PSRR at 217Hz
j Power Output at 5.0V @ 1% THD (8)
j Power Output at 3.3V @ 1% THD
j Shutdown Current
95dB (typ)
1.25W (typ)
550mW (typ)
0.1µA (typ)
Features
n Improved RF suppression, by up to 20dB over previous
designs in selected applications
n Fully differential amplification
n Available in space-saving micro SMD package
n Ultra low current shutdown mode
n Can drive capacitive loads up to 100pF
n Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n 2.4 - 5.5V operation
n No output coupling capacitors, snubber networks or
bootstrap capacitors required
Applications
n Mobile phones
n PDAs
n Portable electronic devices
Typical Application
20170303
FIGURE 1. Typical Audio Amplifier Application Circuit
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2006 National Semiconductor Corporation DS201703
www.national.com




LM4941 pdf, 반도체, 판매, 대치품
Electrical Characteristics VDD = 3V (Notes 1, 2)
The following specifications apply for VDD = 3V, AV = 1, and 8load unless otherwise specified. Limits apply for TA =
25˚C. (Continued)
Symbol
Parameter
CMRR
VOS
VSDIH
VSDIL
TWU
Common-Mode Rejection Ratio
Output Offset
Shutdown Voltage Input High
Shutdown Voltage Input Low
Wake-up Time from Shutdown
Conditions
f = 217Hz, VCM = 200mVpp
VIN = 0V
Cbypass
LM4941
Typical
Limit
(Note 6)
(Note 7)
70
2
1.4
0.4
8
Units
(Limits)
dB
mV (max)
V (min)
V (max)
ms
Note 1: All voltages are measured with respect to the ground pin, unless otherwise specified.
Note 2: 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 3: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX, θJA, and the ambient temperature TA. The maximum
allowable power dissipation is PDMAX = (TJMAX – TA) / θJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4941, see power
derating curve for additional information.
Note 4: Human body model, 100pF discharged through a 1.5kresistor.
Note 5: Machine Model, 220pF – 240pF discharged through all pins.
Note 6: Typicals are measured at 25˚C and represent the parametric norm.
Note 7: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 8: 10terminated input.
Note 9: Data taken with BW = 80kHz and AV = 1/1 except where specified.
External Components Description
(Figure 1)
Components
1. CS
2. CB
3. Ri
4. Rf
Functional Description
Supply bypass capacitor which provides power supply filtering. Refer to the Power Supply Bypassing
section for information concerning proper placement and selection of the supply bypass capacitor.
Bypass pin capacitor which provides half-supply filtering. Refer to the section, Proper Selection of External
Components, for information concerning proper placement and selection of CB.
Inverting input resistance which sets the closed-loop gain in conjunction with Rf.
Internal feedback resistance which sets the closed-loop gain in conjunction with Ri.
www.national.com
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LM4941 전자부품, 판매, 대치품
Typical Performance Characteristics (Note 9) (Continued)
Output Power vs Supply Voltage
RL = 8, Top-THD+N = 10%; Bot-THD+N = 1%
Clipping Voltage vs Supply Voltage
20170317
Output Power vs Load Resistance
Top-VDD = 5V, 10% THD+N, Topmid-VDD = 5V, 1% THD+N
Bot-VDD = 3V, 10% THD+N, Botmid-VDD = 3V, 1% THD+N
20170318
20170319
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