參數(shù)資料
型號(hào)： AN6175K
廠商： PANASONIC CORP
元件分類： 通信及網(wǎng)絡(luò)
英文描述： LJT 29C 29#16 SKT WALL RECP
中文描述： SPECIALTY TELECOM CIRCUIT, PDIP42
封裝： 0.600 INCH, SHRINK, PLASTIC, DIP-42
文件頁數(shù)： 9/21頁
文件大?。?/td> 210K
代理商： AN6175K
9
ICs for Telephone
AN6175K
I
L
(mA)
V
L
(
12
0
0
20
120
R33=1.3k
R33=820
(
standard)
R33=330
38
37
39
V
CC
1
V
CC
1
V
L
R34
C38
V
CC
2
TRB
TRE
MIC amp.
AN6175K
Q3
R33
2. Setting the degree of shifting of the I
L
—V
L
characteristics
Referring to Figs.1—1 and 1—3, the resistance of R33 is now set to 820
(standard).
If R33's resistance is decreased, the curve shifts downward.
If R33's resistance is increased, the curve shifts upward.
As shown in Fig.1—3, the resistance of R33 determines the degree of vertical shifting of the I
L
—V
L
characteristics. R33 also
affects the AC characteristics of the line interface.
Fig.1—4 Line Output
Fig.1—3 I
L
—V
L
Characteristics
38
37
39
V
CC
1
V
CC
1
V
L
R34
C38
V
CC
2
TRB
TRE
MIC amp.
AN6175K
Z
L
=300
Q3
R33
1—2 Setting the AC Characteristics
1. Line output gain adjustment
Fig.1—5 Line Output Block Diagram
Referring to Fig.1—4, the AC impedance(ZAC)of the line inter-
face is calculated as follows :
ZAC= R33/ZQ3
If the impedance of transistor Q3 is 2 k
(ZQ3=2 k), and the
resistance of R33 is 820
, then ZAC is determined as follows :
ZAC= 820//2k
= 600
Use R34 to adjust the line output gain as shown in Fig.1—1.
The line output amplifier gain, G
(38)
, as seen from Pin38, is
calculated as follows :
G
(38)
= 20 log (Z
L
/R34)
If R34 is 27
, G
(38)
is 21dB.
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