音视频放大SGM8903
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2015-07-24
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SGM8903
Capless 3Vrms Line Driver
with Adjustable Gain
GENERAL DESCRIPTION
The SGM8903 is a 3Vrms Pop&Click-less stereo line
driver designed to allow the removal of the output
dc-blocking capacitors for reduced component count and
cost. The device is ideal for single supply electronics
where size and cost are critical design parameters.
The SGM8903 is capable of driving 3Vrms into a 2.5kΩ
load with 5V supply voltage. The device has differential
inputs and uses external gain setting resistors, that
supports a gain range of ±1V/V to ±10V/V. The use of
external gain resistors also allows the implementation of
a 2nd order low pass filter to compliment DAC's and SOC
converters. The SGM8903 has build-in shutdown control
for Pop&Click-free on/off control.
Using the SGM8903 in audio products can reduce
component count compared to traditional methods of
generating a 3Vrms output. The SGM8903 doesn't
require a power supply greater than 5V to generate its
8.5V
PP
output, nor does it require a split rail power supply.
The SGM8903 integrates its own charge pump to
generate a negative supply rail that provides a clean,
pop&click-less ground biased 3Vrms output.
The SGM8903 is available in a 14 pin TSSOP package. It
operates over an ambient temperature range of -40℃ to
+85℃.
FEATURES
z Capless Structure
Eliminates Pop/Clicks
Eliminates Output DC-Blocking Capacitors
Provides Flat Frequency Response DC to 20kHz
z Low Noise and THD
Typical SNR = 107dB
Typical V
N
= 8µVrms
Typical THD+N = 0.001% (f = 1kHz)
z 3Vrms Output Voltage into 2.5kΩ Load with 5V
Supply Voltage
z Differential Input
APPLICATIONS
Set-Top Box
LCD TV
Blue-Ray DVD-Players
Home Theater in a Box
SG Micro Limited
www.sg-micro.com
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