LM4862M 参数 Datasheet PDF下载

Automatic Switching Circuit

DS012342-21

FIGURE 2. Automatic Switching Circuit

External Components Description

Components

1.

2.

R

i

C

i

(Figure

1)

Functional Description

Inverting input resistance which sets the closed-loop gain in conjunction with R

f

. This resistor also forms a

high pass filter with C

i

at f

c

= 1/(2πR

i

C

I

).

Input coupling capacitor which blocks the DC voltage at the amplifier’s input terminals. Also creates a

highpass filter with R

i

at f

c

= 1/(2πR

i

C

i

). Refer to the section,

Proper Selection of External Components,

for an explanation of how to determine the value of C

i

.

Feedback resistance which sets the closed-loop gain in conjunction with R

i

.

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

Power Supply Bypassing

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

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

Proper Selection of External

Components

section for proper placement and selection of the half-supply bypass capacitor.

3.

4.

5.

R

F

C

S

C

B

3

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