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LM4894MM 데이터시트 PDF




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부품번호 LM4894MM 기능
기능 1 Watt Fully Differential Audio Power Amplifier With Shutdown Select
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LM4894MM 데이터시트, 핀배열, 회로
June 2003
LM4894
1 Watt Fully Differential Audio Power Amplifier With
Shutdown Select
General Description
The LM4894 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 watt of continuous average
power to an 8BTL load with less than 1% distortion
(THD+N) from a 5VDC power supply.
Boomer audio power amplifiers were designed specifically to
provide high quality output power with a minimal amount of
external components. The LM4894 does not require output
coupling capacitors or bootstrap capacitors, and therefore is
ideally suited for mobile phone and other low voltage appli-
cations where minimal power consumption is a primary re-
quirement.
The LM4894 features a low-power consumption shutdown
mode. To facilitate this, Shutdown may be enabled by either
logic high or low depending on mode selection. Driving the
shutdown mode pin either high or low enables the shutdown
select pin to be driven in a likewise manner to enable Shut-
down. Additionally, the LM4894 features an internal thermal
shutdown protection mechanism.
The LM4894 contains advanced pop & click circuitry which
eliminates noises which would otherwise occur during
turn-on and turn-off transitions.
The LM4894 is unity-gain stable and can be configured by
external gain-setting resistors.
j Power Output at 5.0V & 1% THD
j Power Output at 3.3V & 1% THD
j Shutdown Current
1.0W(typ)
400mW(typ)
0.1µA(typ)
Features
n Fully differential amplification
n Available in space-saving packages micro SMD, MSOP,
and LLP
n Ultra low current shutdown mode
n Can drive capacitive loads up to 500pF
n Improved pop & click circuitry eliminates noises during
turn-on and turn-off transitions
n 2.2 - 5.5V operation
n No output coupling capacitors, snubber networks or
bootstrap capacitors required
n Unity-gain stable
n External gain configuration capability
n Shutdown high or low selectivity
n High CMRR
Applications
n Mobile phones
n PDAs
n Portable electronic devices
Key Specifications
j Improved PSRR at 217Hz
80dB(typ)
Connection Diagrams
Mini Small Outline (MSOP) Package
LLP Package
20013723
Top View
Order Number LM4894MM
See NS Package Number MUB10A
Boomer® is a registered trademark of National Semiconductor Corporation.
© 2003 National Semiconductor Corporation DS200137
20013735
Top View
Order Number LM4894LD
See NS Package Number LDA10B
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LM4894MM pdf, 반도체, 판매, 대치품
Electrical Characteristics VDD = 3V (Notes 1, 2, 8)
The following specifications apply for VDD = 3V, AV = 1, and 8load unless otherwise specified. Limits apply for TA =
25˚C. (Continued)
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 LM4894, see power derating
currents 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: Datasheet min/max specification limits are guaranteed by design, test, or statistical analysis.
Note 8: For micro SMD only, shutdown current is measured in a Normal Room Environment. Exposure to direct sunlight will increase ISD by a maximum of 2µA.
Note 9: Unterminated input.
Note 10: 10terminated input.
Note 11: When driving 4loads from a 5V supply, the LM4894LD must be mounted to a circuit board.
External Components Description
(Figure 1)
Components
1. Ri
2. Rf
3. CS
4. CB
Functional Description
Inverting input resistance which sets the closed-loop gain in conjunction with Rf.
Feedback resistance which sets the closed-loop gain in conjunction with Ri.
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.
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LM4894MM 전자부품, 판매, 대치품
Typical Performance Characteristics
Non-LD Specific Characteristics (Continued)
THD+N vs Output Power
@ VDD = 3V, 8RL
THD+N vs Output Power
@ VDD = 3V, 4RL
THD+N vs Output Power
@ VDD = 2.6V, 8RL
20013743
THD+N vs Output Power
@ VDD = 2.6V, 4RL
20013744
20013745
Power Supply Rejection Ratio (PSRR) @ VDD = 5V
Input 10Terminated
20013773
Power Supply Rejection Ratio (PSRR) @ VDD = 5V
Input Floating
20013747
7
20013746
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부품번호상세설명 및 기능제조사
LM4894MM

1 Watt Fully Differential Audio Power Amplifier With Shutdown Select

National Semiconductor
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