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參數(shù)資料
| 型號： | AN6175K |
| 廠商： | PANASONIC CORP |
| 元件分類： | 通信及網絡 |
| 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)： | 10/21頁 |
| 文件大?。?/td> | 210K |
| 代理商： | AN6175K |
10
ICs for Telephone
AN6175K
2.
Automatic PAD control adjustment
Automatic PAD control, or APC, is such a function as to automatically adjust transmission gain according to line current (I
L
).
The gain range of the APC of the AN6175K is 6 dB. The adjustment of the APC means setting the IL at which the APC starts
functioning. The adjustment is done by changing the R24/R25 ratio as shown in Fig.2—1.
Under the standard condition(R24=18 k
, R25=12 k
), the I
L
at which the APC starts functioning(the APC start point)is 45 mA
as shown in Fig.2—2.
3
+
–
4
18
38
ECM
TAPC
Vr
MAI
R14
R13
C45
C6
R12
R25
R24
MAO
APC
C42
V
CC
1
V
L
R34
Q3
Z
L
=300
AN6175K
V
CC
1
TRE
(2) Handset(HS)Mode
2—1 Setting the Transmitter System
The block diagram of the transmitter system in the HS mode is shown below.
Fig.2—1 HS Mode Transmitter System Block Diagram
Fig.1—6 Automatic PAD Control
Referring to Fig. 1—6, the APC start point depends on the R24/R25
ratio as follows :
If the ratio increases, the point becomes higher.
If the ratio decreases, the point becomes lower.
Line Current I
L
(mA)
D
0
20
120
45
Larger R24/R25 ratio
Standard R24/R25 ratio
From the emitter of the transmission transistor
To the receiver preamplifier
From line
V
L
pin connecting to the transmission transistor
R1
3.9k
C3
0.039
μ
F
R4
330
R3
3.3k
R2
12k
3. Balance network adjustment
The balance network of the AN6175K application board is shown below. Its constants can be adjusted to application needs.
Fig.1—7 Balance Network
As seen from the above diagram, the gain of the transmitter system from ECM to VL in the HS mode is determined by the gain of
the MIC preamplifier and the gain of the line output amplifier(21dB). How to adjust the gain/frequency characteristics of the MIC
preamplifier is described below.
Smaller R24/R25 ratio
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