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BA7725S View Datasheet(PDF) - ROHM Semiconductor

Part Name
Description
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BA7725S Datasheet PDF : 8 Pages
1 2 3 4 5 6 7 8
Multimedia ICs
(2) LINE IN / LINE OUT gain
Line amplifier gain is fixed at +18dB.
MIC AMP IN
R9 R10
+
22 21
BA7725S / BA7725FS
LINE OUT
+12dB
SW
12
+
LINE IN
Fig.5
After being amplified by the internal microphone amplifier, the audio signal is log-
arithmically compressed by 1 / 2 then input to the tertiary low pass filter, which
comprises an internal BF and attached capacitor and resistor.
(3) Echo level control
The DC voltage supplied to pin 4 (BA7725S) or pin 3 (BA7725FS) determines
when the microphone switch is turned on and off and controls the echo level.
Microphone switch control
Mode
Threshold voltage
MIC OFF
L (1.0V Max.)
MIC ON
H (2.0V Min.)
Operation
Only line audio is output.
Line input and level-controlled microphone input are mixed and output.
Echo level control
Attenuation of the primary echo signals from sound
source can be controlled by changing the DC voltage
impressed on pin 4 (BA7725S) or pin 3 (BA7725FS)
between 2V and 9V.
ATT (dB)
0
Sound source
Attenuation of primary echo signals can be controlled
by changing the DC voltage impressed on pin 6
(BA7725S) or pin 5 (BA7725FS) .
ATT (dB)
0
Sound source
Primary echo
V4 = 9.0V
Primary echo
Secondary echo
– 50
– 50
– 100
0
5
10
ECHO LEVEL CTRL pin voltage : (V)
Line output attenuation vs.
echo level control pin voltage
Fig.6
– 100
0
5
10
LOOP GAIN CTRL pin voltage : (V)
Line output attenuation vs.
loop gain control pin voltage
Fig.7
7
 

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