l6726-s18-t Unisonic Technologies, l6726-s18-t Datasheet - Page 4

• Manufacturer Part Number: l6726-s18-t
• Description: Universal Speech Circuit
• Manufacturer: Unisonic Technologies

L6726
DTMF
input
DC output for external
CMOS device
Mute
(active low)
FUNCTIONAL DIAGRAM
UNISONIC TECHNOLOGIES CO., LTD
C1= 1μF when artificial line is used
www.unisonic.com.tw
+
E=48.5V
R
=400Ω+400Ω
Load
470μF when not used
10
12
13
R
0 Ω when artificail line is used
8
L
DC
=0~4KΩ
9
5
7
5H+5H
AD
AM
V1
1μF
V2
C1
1.Impedance to line and radio interference suppression.
2.Transmit gain and frequency response network.
3.Receive gain and frequency response network.
4.Side tone balance network.
5.DC-supply components.
5
+
Figure 1. Test setup without rectifier bridge
600Ω
11
ARTIFICAIAL
LINE
2
3
AT
V
L
1
2
UTC L6726
V
I
L
4
I
DTMF
DC
DC
+LINE
-LINE
UTC 6726
with external
component
V
see fig 3
M
MUTE
15
AR
LINEAR INTEGRATED CIRCUIT
16 6
REC
MIC
3
14
V4
4
17
18
1
Z
Z
MIC
Rec
V3
=350 Ω
=350 Ω
QW-R108-015,B
4 of 13
Telephone
Line