SD7401 Silan Microelectronics, SD7401 Datasheet - Page 4

• Manufacturer Part Number: SD7401
• Description: SIX-CHANNEL AUDIO AMPLIFIER
• Manufacturer: Silan Microelectronics

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FUNCTION DESCRIPTION
1.
The second-order filter structure shown as above is adopted for 6-channel audio amplifier, with in-band gain of
about 12dB and -3dB bandwidth of 40kHz above which is well meet audio requirements. As principle structure,
in-band gain is decided by:
2.
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.
HANGZHOU SILAN MICROELECTRONICS CO.,LTD
Http://www.silan.com.cn
Mute control pin (pin 4) controls 6-channel as mute by internal switches. It comes to mute mode when pin 4 is
Channel amplifier
Microphone amplifier
Mute & ON/OFF POP noise control
MICIN
G −
AGND
=
R1
R
R
2
1
, thus, gain can be adjusted by changing R1.
+
-
R2
C
V
V
CC
SS
REV:1.0
MICOUT
SD7401
Page 4 of 7
2008.07.07