L6726

Manufacturer Part NumberL6726
DescriptionUNIVERSAL SPEECH CIRCUIT
ManufacturerUnisonic Technologies
L6726 datasheet
 


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L6726
APPLICATION INFORMATION(Cont.)
DESIGN PROCEDURE:
1. Circuit impedance to the line.
2. DC-characteristic
3. Gain regulation.
4. Transmitter gain and frequency response.
5. Receiver gain and frequency response.
6. Side-tone.
7. Components to suppress radio interference, specially the wires up to the handset.
Others:
The circuit can be placed either in the telephone or in the handset.
Cut off the transmitter can be done at F1 without interference of other functions of the circuit.
When using the extended low current and low voltage range (5mA, 2V), two resistors have to be connected from the
microphone inputs to ground as shown in figure 13.
11
3
R
C
A
A
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3
R
A
C
A
C
B
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3
R
A
C
A
R
B
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3
R
C
A
A
www.DataSheet4U.com
R
B
C
B
Figure 7. Examples of network "2"
UNISONIC TECHNOLOGIES CO., LTD
www.unisonic.com.tw
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3
C
R
A
A
R
B
C
B
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3
R
A
C
A
R
B
R
B
C
B
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3
C
A
R
C
A
A
R
B
11
3
R
A
C
A
R
B
C
B
LINEAR INTEGRATED CIRCUIT
2
15
+Line
R
R11
R10
A
R
R
6
B
2
15
R10 +Line
R
R
A
11
R
B
C
R
R
A
6
C
2
15
+Line
R
R
R10
A
11
C
B
R
B
R
R
C
6
C
A
Figure 8. Examples of network "4"
QW-R108-015,B
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