LM4889MASLASHNOPB datasheet(5/27 Pages) TI

5 / 27 page

LM4889

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SNAS157H – APRIL 2002 – REVISED MAY 2013

Electrical Characteristics VDD = 2.6V

(1)(2) (continued)

The following specifications apply for VDD = 2.6V, AV = 2, and 8Ω load unless otherwise specified. Limits apply for TA = 25°C.

LM4889

Units

Symbol

Parameter

Conditions

(Limits)

Typical(3)

Limit(4)(5)

Vripple = 200mV sine p-p

PSRR

Power Supply Rejection Ratio

fripple = 217Hz

fripple = 1kHz

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/(2π RiCi).

Input coupling capacitor which 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.

Feedback resistance which sets the closed-loop gain in conjunction with Ri. AVD = 2*(Rf/Ri).

Supply bypass capacitor which provides power supply filtering. Refer to the POWER SUPPLY BYPASSING section for

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

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

COMPONENTS, for information concerning proper placement and selection of CB.

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