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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： | 7/34頁 |
| 文件大小： | 622K |
| 代理商： | U4090B-N |
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7
U4090B-N
4740A–CORD–09/03
Figure 6.
Supply of Functional Blocks Controlled by Input Voltages V
L
, V
B
, V
RING
and by Logic Inputs PD and IMPSEL
The U4090B-N contains two identical series regulators which provide a supply voltage
V
MP
of 3.3 V suitable for a microprocessor. In speech mode, both regulators are active
because V
MPS
and V
B
are charged simultaneously by the DC-line interface. Output cur-
rent is 4 mA. The capacitor at V
MPS
is used to provide the microcomputer with sufficient
power during long-line interruptions. Thus, long flash pulses can be bridged or a LCD
display can be turned on for more than 2 seconds after going on hook. When the system
is in ringing mode, V
B
is charged by the on-chip ringing power converter. In this mode
only one regulator is used to supply V
MP
with a maximum of 2 mA.
Supply Structure of the
Chip
A major benefit of the chip is that it uses a very flexible supply structure which allows
simple realization of numerous applications such as:
Group listening phone
Hands-free phone
Ringing with the built in speaker amplifier
Answering machine with external supply
The special supply topology for the various functional blocks is illustrated in Figure 6.
There are four major supply states:
1.
Speech condition
2.
Power down (pulse dialing)
3.
Ringing
4.
External supply
Power
supply
Voltage
regulator
Voltage
regulator
RFD
TXA
TXACL
OFFSA
COMP
AFS
IMPED
CONTR
QS
PD
LIDET
LIDET
RFDO
ES
IMPSEL
V
B
RPC
7 V
SAI,SA
SACL
MIC, DTMF
AGA, RA1, RA2
TX MUTE
MUT REC, STBAL
RECATT
6.3 V
V
MP
V
MPS
V
Lon
V
L
V
RING
相關PDF資料 |
PDF描述 |
|---|---|
| U4090B-NFN | Low power dual voltage comparators |
| U4090B-NFNG3 | Low power dual voltage comparators |
| U4090B-P | Low power dual voltage comparators |
| U4091BM-AFN | Low power dual voltage comparators |
| U4091BM-AFNG3 | Low power dual voltage comparators |
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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