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(yè)數(shù)： 14/21頁(yè)
文件大?。?/td> 210K
代理商： AN6175K
14
ICs for Telephone
AN6175K
19
29
30
BN
C29
RPO
RPI
Vr
C32
C31
R31
To LOG4amp.
AN6175K
R32
27
SPI
26
FB
25
SPO1
24
SPO2
+
–
RATT
SP Pre.
20k
2k
Vr
Vr
C27
R29
C24
R28
C26
C25
C28
R31
C23
Loudspeaker
+
–
+
–
3–2 Setting the Receiver System
The block diagram of the receiver system in the HF mode is shown below.
There are two settings for the HF mode receiver system as follows :
Set the gain of the receiver preamplifier.
Set the gain of the loudspeaker amplifier.
Setting of the receiver preamplifier gain is the same as that in the HS mode. How to set the loudspeaker amplifier gain is described
below.
The loudspeaker amplifier gain, G
(SP)
, is calculated as follows :
G
(SP)
=20log R28// {1/(2
π
f C26)} +6
R29+ {1/(2
π
f C27)} (dB)
Note : 6 dB is added for the purpose of BTL configuration.
In the standard condition, R28=R29=20 k
, C26=100 pF, and C27=47
μ
F.
Fig.3–2 HF Mode Receiver System Block Diagram
35
TAPC
38
C42
V
CC
1
V
L
R34
Q3
Z
L
=
600
TRE
18
AN6175K
R24
R25
V
CC
1
MFI
C35
APC
(4) MF Mode
4–1 Setting the MF Signal Gain
Fig. 4–1 shows how the MF signal flows.
Fig.4–1 MF Signal Flow
In the standard condition, the MF signal gain, G(MF), is equal to the line output gain, that is, 21 dB. To adjust the MF signal gain,
use a proper resistor combination as indicated in a dotted box in Fig. 4–1.
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