lm48556tlx National Semiconductor Corporation, lm48556tlx Datasheet - Page 12

• Manufacturer Part Number: lm48556tlx
• Description: Fully Differential, Mono, Ceramic Speaker Driver
• Manufacturer: National Semiconductor Corporation

www.national.com
Where the value of R
Gain Setting Resistor Selection section.
When the LM48556 is using a single-ended source, power
supply noise on the ground is seen as an input signal. Setting
the high-pass filter point above the power supply noise fre-
f = 1 / 2
IN
π
is determined by equation (1) in the
R
IN
C
IN
(Hz)
FIGURE 2. Single-Ended Input Configuration
(3)
12
quencies, 217Hz in a GSM phone, for example, filters out the
noise such that it is not amplified and heard on the output.
Capacitors with a tolerance of 1% or better are recommended
for impedance matching and improved CMRR and PSRR.
SINGLE-ENDED AUDIO AMPLIFIER CONFIGURATION
The LM48556 is compatible with single-ended sources. Fig-
ure 2 shows the typical single-ended applications circuit. In
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