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參數資料
| 型號： | U4090B-N |
| 英文描述： | Low power dual voltage comparators |
| 中文描述： | U4090B氮[更新9 / 03。 34頁] |
| 文件頁數： | 11/34頁 |
| 文件大小： | 622K |
| 代理商： | U4090B-N |
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11
U4090B-N
4740A–CORD–09/03
Figure 11.
Line Detection with Two Comparators for Speech Mode and Pulse Dialing
Line Detection (LIDET)
The line current supervision is active under all operating conditions of the U4090B-N. In
speech mode (PD = inactive), the line-current comparator uses the same thresholds as
the comparator for switching off the entire speaker amplifier. The basic behavior is illus-
trated in Figure 12. Actual values of ILON/ILOFF vary slightly with the adjustment of the
DC characteristics and the selection of the internal line impedance.
When Power Down is activated (during pulse dialing), the entire line current flows
through the short-circuiting transistor QS (see Figure 6). As long as IL is above typically
1.6 mA, output LIDET is low. This comparator does not use hysteresis.
Figure 12.
Line Detection in Speech Mode with Hysteresis
Ringing Power Converter
(RPC)
The RPC transforms the input power at VRING (high voltage/low current) into an equiv-
alent output power at V
B
(low voltage/high current) which is capable of driving the low-
ohmic loudspeaker. Input impedance at VRING is fixed at 5 k and the efficiency of the
step-down converter is approximate 65%.
IL
PD
LIDET
LIDET
ILOFF
ILON
IL
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| U4090B-NFNG3 | Low power dual voltage comparators |
| U4090B-P | Low power dual voltage comparators |
| U4091BM-AFN | Low power dual voltage comparators |
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相關代理商/技術參數 |
參數描述 |
|---|---|
| U4090B-NFN | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telephone Circuit (Support) |
| U4090B-NFNG3 | 制造商:未知廠家 制造商全稱:未知廠家 功能描述:Telecommunication IC |
| U4090B-P | 制造商:ATMEL 制造商全稱:ATMEL Corporation 功能描述:Monolithic Integrated Feature Phone Circuit EMI Improved |
| U4090B-PFNG3Y | 功能描述:電信語音調制 IC COM.CORDED - FEATURE RoHS:否 制造商:Epson Electronics America 產品: 應用:Voice Guidance product 封裝 / 箱體:PQFP-52 電源電壓-最大:3.6 V, 5.5 V 最大工作溫度: 最小工作溫度: 封裝: |
| U4090B-PFNY | 功能描述:電信語音調制 IC COM.CORDED - FEATURE RoHS:否 制造商:Epson Electronics America 產品: 應用:Voice Guidance product 封裝 / 箱體:PQFP-52 電源電壓-最大:3.6 V, 5.5 V 最大工作溫度: 最小工作溫度: 封裝: |
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