LM4831VF National Semiconductor, LM4831VF Datasheet - Page 10

• Manufacturer Part Number: LM4831VF
• Description: IC AMP AUDIO PWR 1.5W AB 44LQFP
• Manufacturer: National Semiconductor
• Series: Boomer®r
• Type: Class ABr

Specifications of LM4831VF

• Output Type: 2-Channel (Stereo)
• Max Output Power X Channels @ Load: 1.5W x 2 @ 4 Ohm
• Voltage - Supply: 2.7 V ~ 5.5 V
• Features: Depop, Input Multiplexer, Microphone, Shutdown
• Mounting Type: Surface Mount
• Package / Case: 44-LQFP
• Lead Free Status / RoHS Status: Contains lead / RoHS non-compliant
• Other names: *LM4831VF

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Typical Performance Characteristic
Line Out
THD+N vs Frequency
Equalizer Output
Noise Floor
Application Information
GROUNDING
Certain grounding techniques should be followed when lay-
ing out the LM4831 circuit. Figure 4 shows how to setup the
grounds for the LM4831. The half-supply bypass ground
LAYOUT
As stated in the Grounding section, placement of ground re-
turn lines is critical for maintaining the highest level of sys-
tem performance. It is not only important to route the correct
ground return lines together, but also important to be aware
of where those ground return lines are routed relative to
each other. The output load ground returns should be physi-
cally located as far as reasonably possible from low signal
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FIGURE 4. Grounding Strategy for LM4831
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Line Out
Noise Floor
(Continued)
10
should be tied with the input source grounds and brought
back to the power supply ground separately from the output
load grounds. in with the input grounds. Bringing the output
load grounds back to the supply separately will keep large
signal currents from interfering with the stable input ground
references.
level lines and their ground return lines. The layout of the mi-
crophone amplifier signal lines is critical, since these lines
generally work at very low signal levels.
SUPPLY BYPASSING
As with all op amps and power op amps, the LM4831 re-
quires the power supplies to be bypassed to reduce distor-
tion and avoid oscillation. To avoid high frequency instabili-
ties, a 0.1µF metallized-film or ceramic capacitor should be
used to bypass each supply pin as near to the chip as pos-
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Equalizer Output
THD+N vs Frequency
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