lm4854mt National Semiconductor Corporation, lm4854mt Datasheet - Page 9

• Manufacturer Part Number: lm4854mt
• Description: 1.9w Monaural, 85mw Stereo Headphone Audio Amplifier
• Manufacturer: National Semiconductor Corporation

External Components Description
Typical Performance Characteristics
Components
See Figure 1.
1.
2.
3.
4.
5.
C
C
R
R
C
B
s
i
i
f
V
V
DD
DD
This is the inverting input resistance that, along with R
input capacitance C
This is the input coupling capacitor. It blocks DC voltage at the amplifier’s inverting input. C
highpass filter. The filter’s cutoff frequency is f
SELECTING EXTERNAL COMPONENTS, for an explanation of determining C
This is the feedback resistance that, along with R
The supply bypass capacitor. Refer to the POWER SUPPLY BYPASSING section for information about
properly placing, and selecting the value of, this capacitor.
This capacitor filters the half-supply voltage present on the BYPASS pin. Refer to the Application
Information section, SELECTING EXTERNAL COMPONENTS, for information about properly placing, and
selecting the value of, this capacitor..
THD+N vs Frequency
THD+N vs Frequency
= 5V, R
P
= 5V, R
P
OUT
OUT
LM4854LD
= 1000mW
= 400mW
L
L
= 4Ω (BTL),
= 8Ω (BTL),
i
form a high pass filter. The filter’s cutoff frequency is f
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Functional Description
9
c
= 1/2πR
i
, sets the closed-loop gain.
f
, sets the closed-loop gain. Input resistance R
i
C
i
. Refer to the Application Information section,
V
V
DD
DD
THD+N vs Frequency
THD+N vs Frequency
= 5V, R
= 5V, R
P
P
OUT
OUT
LM4854LD
= 400mW
c
= 50mW
L
L
= 1/2πR
= 4Ω (BTL),
= 16Ω (SE),
i
’s value.
i
C
i
.
i
and R
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www.national.com
i
create a
i
and