參數(shù)資料
型號(hào)： U4090B-N
英文描述： Low power dual voltage comparators
中文描述： U4090B氮[更新9 / 03。 34頁(yè)]
文件頁(yè)數(shù)： 7/34頁(yè)
文件大?。?/td> 622K
代理商： U4090B-N
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(guān)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(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
U4090B-NFN 制造商:未知廠家 制造商全稱(chēng):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(chēng):未知廠家 功能描述:Telecommunication IC
U4090B-P 制造商:ATMEL 制造商全稱(chēng):ATMEL Corporation 功能描述:Monolithic Integrated Feature Phone Circuit EMI Improved
U4090B-PFNG3Y 功能描述:電信語(yǔ)音調(diào)制 IC COM.CORDED - FEATURE RoHS:否 制造商:Epson Electronics America 產(chǎn)品: 應(yīng)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(yǔ)音調(diào)制 IC COM.CORDED - FEATURE RoHS:否 制造商:Epson Electronics America 產(chǎn)品: 應(yīng)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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