LM4879SDBD National Semiconductor, LM4879SDBD Datasheet - Page 14

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LM4879SDBD

Manufacturer Part Number
LM4879SDBD
Description
BOARD EVALUATION LM4879SD
Manufacturer
National Semiconductor
Series
Boomer®r
Datasheet

Specifications of LM4879SDBD

Amplifier Type
Class AB
Output Type
1-Channel (Mono)
Max Output Power X Channels @ Load
1.1W x 1 @ 8 Ohm
Voltage - Supply
2.2 V ~ 5.5 V
Operating Temperature
-40°C ~ 85°C
Board Type
Fully Populated
Utilized Ic / Part
LM4879
Lead Free Status / RoHS Status
Not applicable / Not applicable
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Application Information
The LM4879 is unity-gain stable and requires no external
components besides gain-setting resistors, an input coupling
capacitor, and proper supply bypassing in the typical appli-
cation. However, if a closed-loop differential gain of greater
than 10 is required, a feedback capacitor (C4) may be
needed as shown in Figure 2 to bandwidth limit the amplifier.
This feedback capacitor creates a low pass filter that elimi-
FIGURE 2. HIGHER GAIN AUDIO AMPLIFIER
(Continued)
14
nates possible high frequency oscillations. Care should be
taken when calculating the -3dB frequency in that an incor-
rect combination of R
20kHz. A typical combination of feedback resistor and ca-
pacitor that will not produce audio band high frequency rolloff
is R
-3dB point of approximately 320 kHz.
3
= 20kΩ and C
4
= 25pf. These components result in a
3
and C
20024388
4
will cause rolloff before

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