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LM4874 Datasheet(Fiches technique) 4 Page - National Semiconductor (TI)

[Old version datasheet] Texas Instruments acquired National semiconductor.
Numéro de pièce LM4874
Description  2.1W Differential Input, BTL Output Stereo Audio Amplifier with Selectable Gain and Shutdown
Télécharger  21 Pages
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Fabricant  NSC [National Semiconductor (TI)]
Site Internet  http://www.national.com
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Electrical Characteristics for LM4874 (Notes 2, 8) (Continued)
Note 6: Machine Model, 220pF-240pF discharged through all pins.
Note 7: The given
θJA is for an LM4874 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 LM4874MH 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 LM4874MH 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
LM4874’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.
Typical Performance Characteristics
MH Specific Characteristics
THD vs Frequency
THD vs Frequency
20046998
V
DD = 5V, RL =4
Ω,P
OUT = 1000mW,
at (from top to bottom at 1kHz):
A
V = 21.6dB, AV = 15.6dB,
A
V = 10dB, AV = 6dB
20046997
V
DD = 5V, RL =8
Ω,P
OUT = 400mW,
at (from top to bottom at 1kHz):
A
V = 21.6dB, AV = 15.6dB,
A
V = 10dB, AV = 6dB
www.national.com
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