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LM4884 Datasheet(Fiches technique) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM4884
Description  2.1W Differential Input, BTL Output Stereo Audio Amplifier with RF Suppression and Shutdown
Télécharger  22 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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Electrical Characteristics for LM4884 (Notes 2, 8) (Continued)
Note 1: An LM4884MH that has been properly mounted to a circuit board with a copper heatsink area of at least 2in2 will deliver 1.9W into 4
Ω or 2.1W into 3Ω.
Note 2: All voltages are measured with respect to the GND pin unless other wise specified.
Note 3: 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 that
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 4: 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 -TAJA or the number given in Absolute Maximum Ratings, whichever is lower. For the LM4884, see power derating
currents for more information.
Note 5: Human body model, 100 pF discharged through a 1.5 k
Ω resistor.
Note 6: Machine Model, 220pF-240pF discharged through all pins.
Note 7: The given
θJA is for an LM4884 packaged in an MXA20A with the exposed-DAP soldered to an exposed 2in2 area of 1oz printed circuit board copper. When
driving 4
Ω loads from a 5V supply, the LM4884MH must be mounted to the circuit board and its exposed-DAP soldered to an exposed 2in2 area of 1oz PCB copper.
Note 8: Typicals are measured at 25˚C and represent the parametric norm.
Note 9: Limits are guaranteed to National’s AOQL (Average Outgoing Quality Level).
Note 10: Datasheet minimum and maximum specification limits are guaranteed by design, test, or statistical analysis.
Note 11: Output power is measured at the amplifier’s package pins.
Note 12: When driving 3
Ω or 4Ω loads and operating on a 5V supply, the LM4884MH must be mounted to a circuit board that has a minimum of 2in2 of exposed,
uninterrupted copper area connected to the MH package’s exposed DAP.
External Components Description
See Figure 1.
Components
Functional Description
1.
C
i
The input coupling capacitor blocks DC voltage at the amplifier’s inverting input terminals. C
i, along with the
LM4884’s variable input resistance R
1 (See Table 1), creates a highpass filter with fC = 1/(2
πR
iCi). Both
inverting and noninverting inputs require a C
i. Refer to the Application Information section, SELECTING
EXTERNAL COMPONENTS, for an explanation of determining the value of C
i.
2.
C
S
The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about
properly placing, and selecting the value of, this capacitor.
3.
C
B
The capacitor, C
B, filters the half-supply voltage present on the BYPASS pin. Refer to the Application
Information section, SELECTING EXTERNAL COMPONENTS, for information concerning proper placement
and selecting C
B’s value.
www.national.com
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