LM4874MH datasheet(4/21 Pages) NSC

4 / 21 page

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

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

The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about

properly placing, and selecting the value of, this capacitor.

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

20046998

DD = 5V, RL =4

Ω,P

OUT = 1000mW,

at (from top to bottom at 1kHz):

V = 21.6dB, AV = 15.6dB,

V = 10dB, AV = 6dB

20046997

DD = 5V, RL =8

Ω,P

OUT = 400mW,

at (from top to bottom at 1kHz):

V = 21.6dB, AV = 15.6dB,

V = 10dB, AV = 6dB

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