LM4880

SNAS103C – NOVEMBER 1995 – REVISED MAY 2013

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Automatic Switching Circuit

Figure 4. Automatic Switching Circuit

External Components Description

(Figure 2)

Components

Functional Description

1.

Ri

Inverting input resistance which sets the closed-loop gain in conjunction with RF. This resistor also forms a high

pass filter with Ci at fc = 1/(2πRiCi).

2.

Ci

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

filter with Ri at fc = 1/(2πRiCi). Refer to PROPER SELECTION OF EXTERNAL COMPONENTS for an explanation

of how to determine the value of Ci.

3.

RF

Feedback resistance which sets closed-loop gain in conjunction with Ri.

4.

CS

Supply bypass capacitor which provides power supply filtering. Refer to Application Information for proper

placement and selection of the supply bypass capacitor.

5.

CB

Bypass pin capacitor which provides half-supply filtering. Refer to PROPER SELECTION OF EXTERNAL

COMPONENTS for information concerning proper placement and selection of CB.

6.

Co

Output coupling capacitor which blocks the DC voltage at the amplifier's output. Forms a high pass filter with RL at

fo = 1/(2πRLCo).

4

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