參數(shù)資料
型號： 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)： 12/21頁
文件大?。?/td> 210K
代理商： AN6175K
12
ICs for Telephone
AN6175K
21
22
20
29
30
RAPC
+
–
BN
Handset receiver
C21
R27
R26
DI
DO
APC
RPO
RPI
Receiver
preamplifier
Receiver amplifier
Vr
C32
C31
C20
R31
V
CC
1
R24
R25
C22
To LOG4amp.
AN6175K
R32
2–2 Setting the Receiver System
The block diagram of the receiver system in the HS mode is shown below.
There are two adjustments for the HS mode receiver system as follows :
1. Set the frequency characteristics of the receiver preamplifier.
2. Adjust the receiver amplifier.
Fig.2–4 HS Mode Receiver System Block Diagram
20
29
30
BN
RPI
Receiver preamplifier
Vr
C32
C31
R31
To LOG4amp.
AN6175K
RPO
R32
To receiver amplifier
Frequency (Hz)
G
F
N
0
–3
1. Receiver Preamplifier Frequency Characteristics Setting
Fig.2–5 is the block diagram for the receiver preamplifier.
F
= 1 1
1
2
π
C31
C32 R31
R32
Fig.2–5 Receiver Preamplifier Block Diagram
Fig.2–6 HPF Frequency Characteristics
A high-pass filter(HPF)consisting of R31, R32, C31, and C32 blocks external hum noise. The frequency characteristics of the
HPF are calculated as follows(see Fig. 2-6) :
In the standard condition, R31=56 k
, R32=220 k
, and C31=C32= 0.0047
μ
F.
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