LM4880 datasheet(3/10 Pages) UTC

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UTCLM4880

CMOS IC

UTC UNISONIC TECHNOLOGIES CO., LTD.

QW-R502-033,A

device performance.

Note 3: Human body model, 100 pF discharged through a 1.5 kΩ resistor.

Note 4: Machine model, 220 pF ~ 240 pF discharged through all pins.

Note 5: The maximum power dissipation must be derated at elevated temperatures and is dictated by TJMAX,θJA,

and the ambient temperature TA. The maximum allowable power dissipation is PDMAX = (TJMAX - TA) /θJA or

the number given in the Absolute Maximum Ratings, whichever is lower. For the UTC LM4880, TJMAX = 15

℃

, and the typical junction-to-ambient thermal resistance is 170℃/W for SOP-8 package and 107℃/W for

DIP-8 package.

TYPICAL APPLICATION

OUT A

OUT B

Shutdown

Bypass

IN B

Bias

IN A

GND

20k

Audio

Input

Audio

Input

20kΩ

VDD/2

50kΩ

0.1μF

20kΩ

R F

VDD

*Co

8Ω or

50kΩ

*Co

1.0 F

*Ci

20kΩ

8Ω or

Figure 1.Typical Audio Amplifier Application Circuit

EXTERNAL COMPONENTS DESCRIPTION (Figure 1)

COMPONENTS

FUNCTIONAL DESCRIPTION

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/(2

πRiCi).

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/(2

πRiCi).

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

Supply bypass capacitor which provides power supply filtering.

Bypass pin capacitor which provides half-supply filtering.

Output coupling capacitor which blocks the DC voltage at the amplifier’s output. Forms a high

pass filter with RL at fo = 1/(2

πRLCo).

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