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參數(shù)資料
| 型號： | KS8630D |
| 廠商： | SAMSUNG SEMICONDUCTOR CO. LTD. |
| 英文描述： | ENHANCED CALLING LINE IDENTIFIER WITH CALL WAITING |
| 中文描述： | 增強電話線呼叫等待標識符 |
| 文件頁數(shù)： | 10/23頁 |
| 文件大?。?/td> | 258K |
| 代理商： | KS8630D |
KS8630D
ENHANCED CALLING LINE IDENTIFIER WITH CALL WAITING
10
PRELIMINARY
Input Signal Amplifier
KS8630D can adjust the input signals appearing at the TIP/RING block in application, so that they are included
within the range that can be handled with the block. The internal Amp. configuration of KS8630D is a subtract
structure, and it was recommend that the signal input in the differential mode to the chip is reduced by half level
compared to the signal in the TIP/RING block.
Figure 7. Input Signal Amplifier. (a) single-ended (b) differential-ended
Filtering Block
The outband noise of input signal which interfered by transmission line or Near-end speech is eliminated by the
filtering block. The filtering block includes the SCF-configured Dual Tone BPF, FSK BPF, and LPF for filtering the
SCF clock-generated noise. The dual tone BPF is a narrowband 4th filter which composed of biquads. The quality
factor of dual tone filter is between 20 and 25 approximately. The low tone filter and high tone filter are composed
of same core, and the cutoff frequency can be changed according to the switching clock (CLK1, CLK2).
The FSK BPF is a wideband 4th filter, and the Dual Tone BPF and FSK BPF can be selected according to the
detection mode in KS8630D .
(a)
(b)
VREF
INP
INN
R2
C1
R
R
R
R
Amplifier
VREF
INP
INN
R8
R7
C3
C4
R5
R6
R
R
R
R
Amplifier
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