LM1876

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SNAS097C – MAY 1999 – REVISED APRIL 2013

(excluding active protection circuitry)

External Components Description

Components

Functional Description

1

Prevents currents from entering the amplifier's non-inverting input which may be passed through to the load upon

power down of the system due to the low input impedance of the circuitry when the undervoltage circuitry is off.

This phenomenon occurs when the supply voltages are below 1.5V.

2

3

4

(1)

5

Provides power supply filtering and bypassing. Refer to SUPPLY BYPASSING for proper placement and selection

of bypass capacitors.

6

(1)

Acts as a volume control by setting the input voltage level.

7

(1)

8

(1)

Input capacitor which blocks the input signal's DC offsets from being passed onto the amplifier's inputs.

9

(1)

10

(1)

11

Provides high impedance at high frequencies so that R may decouple a highly capacitive load and reduce the Q of

the series resonant circuit. Also provides a low impedance at low frequencies to short out R and pass audio signals

12

to the load. Refer to Figure 5.

13

Provides DC voltage biasing for the transistor Q1 in single supply operation.

14

Provides bias filtering for single supply operation.

15

(1)

Limits the voltage difference between the amplifier's inputs for single supply operation. Refer to CLICKS AND

16

Provides input bias current for single supply operation. Refer to CLICKS AND POPS for a more detailed

17

Establishes a fixed DC current for the transistor Q1 in single supply operation. This resistor stabilizes the half-

(1)

Optional components dependent upon specific design requirements.

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9

Product Folder Links: LM1876