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PDF SD7402 Data sheet ( Hoja de datos )

Número de pieza SD7402
Descripción Three-Channel Audio Amplifier
Fabricantes Silan Microelectronics 
Logotipo Silan Microelectronics Logotipo



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SD7402 Hoja de datos, Descripción, Manual
THREE-CHANNEL AUDIO AMPLIFIER
DESCRIPTION
SD7402 is a 3-channel audio amplifier with built-in microphone input
amplifier. High quality audio output is available through simple
peripheral circuit and the amplifier gain can be adjusted flexibly by
external resistor. Its audio output signal-noise ratio is 85dB, total
harmonic distortion is 0.05% and the channel separation is 78dB.
Based on BICMOS technology, SD7402 can stably work in +5V/-
12V system with built-in voltage regulator. The built-in filter can
improve the audio quality by attenuating the other signals. The mute
and ON/OFF POP suppression functions can suppress the POP
noise in the input signal.
It is widely used as pre-amplification in various stereo and 2.1-
channel audio systems to pre-amplify the signal from the main chip
audio.
FEATURES
* BICMOS technology
* Dual power supply (+5V/-12V)
* Built-in voltage regulator
* Low distortion
* Standby function
* Mute function and ON/OFF POP noise suppression
SOP-16-225-1.27
APPLICATIONS
* CD/VCD/DVD
* Other audio systems
ORDERING INFORMATION
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Part No.
Package
SD7402
SOP-16-225-1.27
SD7402TR
SOP-16-225-1.27
Marking
SD7402
SD7402
Material
Pb free
Pb free
Package Type
Tube
Tape & Reel
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2009.11.11
Page 1 of 7

1 page

SD7402 pdf
2. Microphone amplifier
The proportional amplifier shown as above is adopted for microphone amplifier with setting gain of about 29dB,
and capacitor C is used for high frequency signal filtering. As described above, the gain can be also adjusted by
changing R1.
3. Mute & ON/OFF POP noise control
Mute control pin (pin 4) controls 3-channel as mute by internal switches. It comes to mute mode when pin 4 is
connected to Vcc (high level) and comes to normal mode when connected to ground.
Pin 2 is used for POP noise restrain by connecting an external capacitor which can be increased appropriately
for better POP noises restrain effect. In general, POP noise restrain is realized by mute control. Mute pulse is
generated when turned on for zero output and ended after powered on for normal output; mute pulse is also
generated when power supply is threshold value below during turned off for zero output. Thus, pop noise is
restrained during power on/down.
4. Power supply
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The built-in voltage regulator for negative power supply is shown as below. An external resistor R guarantees
voltage stability near -5V on pin 15 and the chip power supply is ±5V for normal operation. Because the
negative power to provide current is decided by this resistance, if the system output is light load, this resistance
can be properly increased to reduce operate current, but the voltage of pin 15 must be maintained and can not
drop significantly.
5. System standby
The pin STBY_N controls system entering standby mode by turning off internal amplifier bias circuit. When this
pin is connected to Vss, system enters standby mode, and when floated, system works normally.
Note: internal voltage regulating circuit still works in standby mode and supplies working current.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
REV:1.0 2009.11.11
Page 5 of 7

5 Page



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