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LM4889MM Datasheet(PDF) 5 Page - Texas Instruments

No. de pieza LM4889MM
Descripción Electrónicos  1 Watt Audio Power Amplifier
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LM4889MM Datasheet(HTML) 5 Page - Texas Instruments

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LM4889
www.ti.com
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
44
dB
fripple = 1kHz
44
dB
External Components Description
(Figure 1)
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/(2π RiCi).
2.
Ci
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.
3.
Rf
Feedback resistance which sets the closed-loop gain in conjunction with Ri. AVD = 2*(Rf/Ri).
4.
CS
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.
5.
CB
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.
Copyright © 2002–2013, Texas Instruments Incorporated
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