lm4874mh National Semiconductor Corporation, lm4874mh Datasheet - Page 4

• Manufacturer Part Number: lm4874mh
• Description: 2.1w Differential Input, Btl Output Stereo Audio Amplifier With Selectable Gain And Shutdown
• Manufacturer: National Semiconductor Corporation

www.national.com
Electrical Characteristics for LM4874
Note 6: Machine Model, 220pF-240pF discharged through all pins.
Note 7: The given θ
driving 4Ω loads from a 5V supply, the LM4874MH must be mounted to the circuit board and its exposed-DAP soldered to an exposed 2in
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 3Ω or 4Ω loads and operating on a 5V supply, the LM4874MH must be mounted to a circuit board that has a minimum of 2in
uninterrupted copper area connected to the MH package’s exposed DAP.
External Components Description
See Figure 1 .
Typical Performance Characteristics
MH Specific Characteristics
Components
1.
2.
3.
C
C
C
V
S
B
i
DD
at (from top to bottom at 1kHz):
JA
= 5V, R
A
The input coupling capacitor blocks DC voltage at the amplifier’s inverting input terminals. C
LM4874’s variable input resistance R
inverting and noninverting inputs require a C
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
Information section, SELECTING EXTERNAL COMPONENTS, for information concerning proper placement
and selecting C
is for an LM4874 packaged in an MXA20A with the exposed-DAP soldered to an exposed 2in
V
A
= 21.6dB, A
THD vs Frequency
V
= 10dB, A
L
= 4Ω, P
B
V
B
OUT
V
’s value.
, filters the half-supply voltage present on the BYPASS pin. Refer to the Application
= 15.6dB,
= 6dB
= 1000mW,
20046998
1
(See Table 1), creates a highpass filter with f
Functional Description
i
. Refer to the Application Information section, SELECTING
(Notes 2, 8) (Continued)
4
V
DD
at (from top to bottom at 1kHz):
A
= 5V, R
V
A
= 21.6dB, A
THD vs Frequency
V
= 10dB, A
2
L
area of 1oz printed circuit board copper. When
= 8Ω, P
i
.
V
V
OUT
= 15.6dB,
C
= 6dB
= 1/(2πR
= 400mW,
2
area of 1oz PCB copper.
i
, along with the
i
C
i
). Both
20046997
2
of exposed,