lm4808ldx National Semiconductor Corporation, lm4808ldx Datasheet - Page 5

• Manufacturer Part Number: lm4808ldx
• Description: Dual 105 Mw Headphone Amplifier
• Manufacturer: National Semiconductor Corporation

External Components Description
Typical Performance
Characteristics
Components
1. R
2. C
3. R
4. C
5. C
6. C
7. R
i
i
f
S
B
O
B
THD+N vs Frequency
THD+N vs Frequency
Functional Description
The inverting input resistance, along with R
pass filter with f
The input coupling capacitor blocks DC voltage at the amplifier’s input terminals. C
create a highpass filter with f
Components, for an explanation of determining the value of C
The feedback resistance, along with R
This is the supply bypass capacitor. It provides power supply filtering. Refer to the Application
Information section for proper placement and selection of the supply bypass capacitor.
This is the half-supply bypass pin capacitor. It provides half-supply filtering. Refer to the section,
Selecting Proper External Components, for information concerning proper placement and selection
of C
This is the output coupling capacitor. It blocks the DC voltage at the amplifier’s output and forms a high
pass filter with R
This is the resistor which forms a voltage divider that provides 1/2 V
amplifier.
B
.
c
L
= 1/(2 R
at f
O
= 1/(2 R
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i
C
i
).
C
= 1/(2 R
L
C
O
)
i
( Figure 1 )
, set closed-loop gain.
i
C
i
). Refer to the section, Selecting Proper External
5
f
, set the closed-loop gain. R
i
.
THD+N vs Frequency
THD+N vs Frequency
DD
to the non-inverting input of the
i
, along with C
i
, along with R
i
, form a high
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i
,