LM4871

SNAS002F – FEBRUARY 2000 – REVISED MAY 2013

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Electrical Characteristics

(1)(2) (continued)

The following specifications apply for VDD = 5V and RL = 8Ω unless otherwise specified. Limits apply for TA = 25°C.

LM4871

Symbol

Parameter

Conditions

Units

Min(3)

Typical(4)

Limit(3)

(Limits)

Po

Output Power

THD = 1%, f = 1kHz

LM4871LD, RL = 3Ω

(5)

2.38

W

LM4871LD, RL = 4Ω

(5)

2

LM4871, RL = 8Ω

(5)

1.2

THD+N = 10%, f = 1kHz

LM4871LD, RL = 3Ω

(5)

3

W

LM4871LD, RL = 4Ω

(5)

2.5

LM4871, RL = 8Ω

(5)

1.5

THD+N

Total Harmonic

20Hz

≤ f ≤ 20kHz, AVD = 2

Distortion+Noise

LM4871LD, RL = 4Ω, P O = 1.6W

0.13

%

LM4871, RL = 8Ω, P O = 1W

0.25

PSRR

Power Supply Rejection Ratio

VDD = 4.9V to 5.1V

60

dB

(5)

When driving 3

Ω or 4Ω loads from a 5V supply, the LM4871LD must be mounted to a circuit board.

External Components Description

(Figure 3)

Components

Functional Description

1.

Ri

Inverting input resistance that sets the closed-loop gain in conjunction with Rf. This resistor also forms a high pass filter

with Ci at fC= 1/(2π RiCi).

2.

Ci

Input coupling capacitor that blocks the DC voltage at the amplifiers input terminals. Also creates a highpass filter with

Ri at fc = 1/(2π RiCi). Refer to the section, Proper Selection of External Components, for an explanation of how to

determine the value of Ci.

3.

Rf

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

4.

CS

Supply bypass capacitor that provides power supply filtering. Refer to the Power Supply Bypassing section for

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

5.

CB

Bypass pin capacitor that provides half-supply filtering. Refer to the section, Proper Selection of External Components,

for information concerning proper placement and selection of CB.

4

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