LM4819MM National Semiconductor, LM4819MM Datasheet - Page 12

• Manufacturer Part Number: LM4819MM
• Manufacturer: National Semiconductor

Specifications of LM4819MM

• Operational Class: Class-AB
• Audio Amplifier Output Configuration: 1-Channel Mono
• Output Power (typ): 0.35x1@16OhmW
• Audio Amplifier Function: Speaker
• Input Offset Voltage: 50mV
• Total Harmonic Distortion: 1@16Ohm@270mW%
• Single Supply Voltage (typ): 3/5V
• Dual Supply Voltage (typ): Not RequiredV
• Power Supply Requirement: Single
• Unity Gain Bandwidth Product (typ): 900KHz
• Rail/rail I/o Type: No
• Single Supply Voltage (min): 2V
• Single Supply Voltage (max): 5.5V
• Dual Supply Voltage (min): Not RequiredV
• Dual Supply Voltage (max): Not RequiredV
• Operating Temp Range: -40C to 85C
• Operating Temperature Classification: Industrial
• Mounting: Surface Mount
• Pin Count: 8
• Package Type: Mini SOIC
• Lead Free Status / Rohs Status: Not Compliant

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Application Information
HIGHER GAIN AUDIO AMPLIFIER
The LM4819 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 (C
needed as shown in Figure 2 to bandwidth limit the amplifier.
This feedback capacitor creates a low pass filter that elimi-
nates possible high frequency oscillations. Care should be
(Continued)
4
) may be
Figure 2
12
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. It is not recommended
that the feedback resistor and capacitor be used to imple-
ment a band limiting filter below 100kHz.
3
= 20k
and C
4
= 25pF. These components result in a
3
and C
DS200136-24
4
will cause rolloff before