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LC75106V-TLM-H Datasheet(PDF) 14 Page - ON Semiconductor

Part No. LC75106V-TLM-H
Description  Digital Echo LSI with Built-in Mic Amplifier
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Manufacturer  ONSEMI [ON Semiconductor]
Direct Link  http://www.onsemi.com
Logo ONSEMI - ON Semiconductor

LC75106V-TLM-H Datasheet(HTML) 14 Page - ON Semiconductor

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LC75106V
No. A2153-14/15
(4) Mic AMP Gain setting
Mic Amplifier Gain is adjusted according to the resistance value applied to 3pin and 34pin. And low frequency is cut
off by connecting condenser.
Mic Amplifier has built-in ALC (Auto Level Control). Output level can be controlled by inputting the standard
voltage to 31pin.
1) Mic AMP Gain setting
• R1 = 56.2kΩ
[Mic Gain = 38dB]
R2 = R1/Mic Gain
=56.2k/79.4
≈ 680
2) fc setting
fc =
1
2
π R1 C1
(5) ALC control voltage setting
1) ALC control voltage setting
When the ALC detecting voltage is input to 31pin, the ALC operation level can be set.
The setting method becomes as follows.
[VDD = 9.0V/1Vrms setting]
VDD/2 = 9.0/2 = 4.5
1Vrms/2 =
√2 * 1 = 1.414V
VALC setting voltage = 4.5 – 1.414 = 3.086V (DC)
ALC setting voltage can be set to put resistance between the terminal VREF and the terminal GND.
* The voltage of the terminal VREF depends on the power-supply voltage and changes.
2) ALC attack time/release time setting
The attack time and the release time of ALC can be set with the capacitor between 2pin - VDD and 35pin - VDD.
capacitor
Attack time
Release time
Note
2.2
μF
About 60ms
About 6.0s
1.0
μF
About 35ms
About 2.5s
0.1
μF
About 16ms
About 0.25s
1
4
+
+
R2
R1
VREF
3
ALC
2
C1
R2
C2


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