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LM4941TMBD Scheda tecnica(PDF) 10 Page - Texas Instruments

Il numero della parte LM4941TMBD
Spiegazioni elettronici  1.25 Watt Fully Differential Audio Power Amplifier With RF Suppression and Shutdown
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Produttore elettronici  TI1 [Texas Instruments]
Homepage  http://www.ti.com
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LM4941TMBD Scheda tecnica(HTML) 10 Page - Texas Instruments

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0
90
180
0
0.1
0.2
0.3
0.4
0.6
0.7
AMBIENT TEMPRATURE (
oC)
120
150
0.5
TM
LLP
Note 11
30
60
0
20
40
60
LOAD RESISTANCE (:)
0
0.2
0.4
0.6
0.8
1
1.2
1.4
1.6
1.8
10
30
50
70
3
0
0.4
1.4
1.6
1.8
SUPPLY VOLTAGE (V)
4.5
1.5
2
1.5
3.5
5
4
0.2
0.6
0.8
1
1.2
5.5
1
LM4941, LM4941SDBD, LM4941TMBD
SNAS347B – JUNE 2006 – REVISED MARCH 2007
www.ti.com
Typical Performance Characteristics
(1) (continued)
Output Power
vs
Load Resistance
IDDQ
Top-VDD = 5V, 10% THD+N, Topmid-VDD = 5V, 1% THD+N
vs
Bot-VDD = 3V, 10% THD+N, Botmid-VDD = 3V, 1% THD+N
Supply Voltage
Power Derating Curve
fIN = 1kHz, RL = 8Ω
Application Information
OPTIMIZING RF IMMUNITY
The internal circuitry of the LM4941 suppresses the amount of RF signal that is coupled into the chip. However,
certain external factors, such as output trace length, output trace orientation, distance between the chip and the
antenna, antenna strength, speaker type, and type of RF signal, may affect the RF immunity of the LM4941. In
general, the RF immunity of the LM4941 is application specific. Nevertheless, optimal RF immunity can be
achieved by using short output traces and increasing the distance between the LM4941 and the antenna.
DIFFERENTIAL AMPLIFIER EXPLANATION
The LM4941 is a fully differential audio amplifier that features differential input and output stages. Internally this is
accomplished by two circuits: a differential amplifier and a common mode feedback amplifier that adjusts the
output voltages so that the average value remains VDD / 2. When setting the differential gain, the amplifier can be
considered to have "halves". Each half uses an input and feedback resistor (Ri and RF) to set its respective
closed-loop gain (see Figure 1). With Ri1 = Ri2 and RF1 = RF2, the gain is set at -RF / Ri for each half. This results
in a differential gain of
10
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Copyright © 2006–2007, Texas Instruments Incorporated
Product Folder Links: LM4941 LM4941SDBD LM4941TMBD


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