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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 |
| 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)： | 11/21頁 |
| 文件大小： | 210K |
| 代理商： | AN6175K |
11
ICs for Telephone
AN6175K
3
+
–
4
ECM
Vr
V
CC
1
MAI
R14
R13
C45
C6
R12
MAO
AN6175K
To APC
Larger C45
Smaller C45 Larger C6
Smaller C6
Standard C45
Standard C6
Input Frequency (Hz)
G
300
1k
4k
Fig.2—2 MIC Preamplifier
Fig.2—3 HS Mode Transmitter Frequency Characteristics
MIC Preamplifier Gain/Frequency Characteristics Adjustment
The external components, R12, R13, C6, and C45, determine the MIC preamplifier gain/frequency characteristics in the HS mode
as shown in Fig. 2—2. R12 and C6 form a low-pass filter, and R13 and C45 form a high-pass filter.
Referring to Fig.2—2, the MIC preamplifier gain, G
(HSMIC)
, is cal-
culated as follows :
G
(HSMIC)
= 20log {1/ (2
π
f C6)}// R12
{1/ (2
π
f C45)} + R13
(dB)
In the standard condition, R12=R13=10 k
, C6=102 pF, and C45
= 0.1
μ
F.
The HS mode transmitter frequency characteristics are calculated as follows :
High-band cutoff frequency, f
HC
=1/(2
π
C6 · R12)
Low-band cutoff frequency, f
LC
=1/(2
π
C45 · R13)
Referring to the above calculations :
For the low-pass filter, the larger the C6 capacitance, the lower the cutoff frequency, or the smaller the capacitance, the
higher the frequency.
For the high-pass filter, the larger the C45 capacitance, the lower the cutoff frequency, or the smaller the capacitance, the
higher the frequency. See Fig.2—3.
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