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參數(shù)資料
| 型號： | SC88E43S |
| 廠商： | Electronic Theatre Controls, Inc. |
| 英文描述： | EXTENDED VOLTAGE CALLING NUMBER IDENTIFICATION CIRCUIT 2 |
| 中文描述： | 更廣的電壓主叫號碼識別電路2 |
| 文件頁數(shù)： | 17/25頁 |
| 文件大小： | 389K |
| 代理商： | SC88E43S |
Silan
Semiconductors
SC88E43
HANGZHOU SILAN MICROELECTRONICS JOINT-STOCK CO.,LTD
Rev: 1.0
2000.12.31
17
Figure 10. For example when VDD =5V (+/- 10%), R 1 should equal 430kW and R4 should equal 34kW; and if VDD
=3V (+/- 10%) R1 should equal 620kW and R 4 should equal 63.4kW. Resistors R1 and R4 are shown in Figures 9
and 11.
The circuit shown in Figure 9 illustrates the use of the SC88E43 in a proprietary system that doesn’t need to
meet FCC, DOC, and UL approvals. It should be noted that if glitches on the Tip/Ring interface are of sufficient
amplitude, the circuit will falsely detect these signals as ringing or line reversal.
The circuit shown in Figure 11 will provide common mode rejection of signals received by the ringing circuit. This
circuit should pass safety related tests specified by FCC Part 68, DOC CS-03, UL 1459, and CSA C22.2. These
safety tests will simulate high voltage faults that may occur on the line. The circuit provides isolation from these
high voltage faults via R1 and the 12.1kWresistors as well as the 22nF & 330nF capacitors. IRC manufactures a
resistor (part number GS3) that should be used for R1. This resistor is a 3W, 5%, 1kV power resistor. The 12k1
resistor is manufactured by IRC (part number FA8425F). This resistor is a 1.5W, 5%, fuseable type resistor. The
22nF and 330nF capacitors have a 400V rating.
1
0.95
0.9
0.85
0.8
0.75
0.7
0.65
0.6
G
2
2.5
3
3.5
4
4.5
5
5.5
6
Nominal V
DD
(Volts)
0.678
Figure 10: Gain Ratio as a function of Nominal V
DD
Note: In the application circuits shown in Figure9 and 11, the Gain ratio of SC88E43 opamp is:
Gain Ratio=464k
/(R1+R4)
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