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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)： | 13/21頁 |
| 文件大?。?/td> | 210K |
| 代理商： | AN6175K |
13
ICs for Telephone
AN6175K
21
22
Handset receiver
C21
R26
R27
DI
DO
Receiver amplifier
AN6175K
C22
G
= 20log R27
R26 + {1/(2
π
f C21)} (dB)
In the standard condition, R26=1 k
, R27=100 k
, and C21=10
μ
F.
Fig.2–7 Receiver Amplifier
2. Receiver Amplifier Gain Adjustment
Use R26, R27, and C21 to adjust the receiver amplifier gain as shown in Fig.2–7.
2
+
–
AN6175K
1
18
36
20
TAPC
ECM
TATT
38
C42
V
CC
1
V
L
R34=27
Q3
Z
L
=300
TRB
V
CC
1
R24
R25
C44
HFI
C37
TAO
MAO
MAI
V
CC
1
R11
C22
R10
R9
C5
Vr
(3) Hands-Free (HF) Mode
3–1 Setting the Transmitter System
The block diagram of the transmitter system in the HF mode is shown below.
Fig.3–1 HF Mode Transmitter System Block Diagram
G
= 20log {1/(2
π
f C5)}// R9
{1/(2
π
f C44)} + R10 (dB)
In the standard condition, R9=26 k
, R10=10 k
, C5=102 pF, and C44=0.1
μ
F.
Referring to Fig.2–7, the receiver amplifier gain, G
(REC)
, is calculated as
follows :
As seen from the above diagram, the gain of the transmitter system from ECM to VL in the HF mode is determined by the gains
of the MIC preamplifier, transmitter attenuator(T ATT), and line output amplifier. The gain of the T ATT is 0 dB, and the gain of
the line output amplifier is 21 dB(see 1-2, Setting the AC Characteristics). How to adjust the gain of the MIC preamplifier is the
same as that in the HS mode. The gain, G(HSMIC), is calculated as follows :
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