LM4892M Datasheet

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LM4892

External Components Description

Components

4.

5.

6.

C

S

C

B

C

OUT

(Figure

1)

(Continued)

Functional Description

Supply bypass capacitor which provides power supply filtering. Refer to the

Power Supply Bypassing

section for information concerning proper placement and selection of the supply bypass capacitor.

Bypass pin capacitor which provides half-supply filtering. Refer to the section,

Proper Selection of External

Components,

for information concerning proper placement and selection of C

B

.

This output coupling capacitor blocks DC voltage while coupling the AC audio signal to the headphone

speaker. Combined with R

L

, the headphone impedance, it creates a high pass filter at f

c

= 1/(2蟺R

L

C

OUT

).

Refer to the section,

Proper Selection of External Components

for an explanation of how to determine the

value of C

OUT

.

This is the pull up resistor to activate headphone operation when a headphone plug is plugged into the

headphone jack.

This is the current limiting resistor for the headphone input pin.

This is the pull down resistor to de-activate headphone operation when no headphone is plugged into the

headphone jack.

7.

8.

9.

R

PU

R

S

R

PD

Typical Performance Characteristics

THD+N vs Frequency

at V

DD

= 5V, 8鈩?R

L

, and PWR = 250mW

THD+N vs Frequency

at V

DD

= 3.3V, 8鈩?R

L

, and PWR = 150mW

20012737

20012738

THD+N vs Frequency

at V

DD

= 2.6V, 8鈩?R

L

, and PWR = 100mW

THD+N vs Frequency

at V

DD

= 2.6V, 4鈩?R

L

, and PWR = 100mW

20012739

20012740

5

www.national.com

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