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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： | 12/34頁 |
| 文件大小： | 622K |
| 代理商： | U4090B-N |
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12
U4090B-N
4740A–CORD–09/03
Figure 13.
Comparator Thresholds Depending on DC Mask and Line Impedance
Ringing Frequency
Detector (RFD)
The U4090B-N offers an output signal for the microcontroller, which is a digital repre-
sentation of the double ringing frequency. It is generated by a current comparator with
hysteresis. The input voltage V
RING
is transformed into a current via RTHA. The thresh-
olds are 8 μA and 24 μA. RFDO and V
RING
are in phase. A second comparator with
hysteresis is used to enable the output RFDO as long as the supply voltage for the
microprocessor VMP is above 2.0 V.
10
12
14
16
18
3
4
5
6
7
V
L
I
L
(mA)
20
R
DC
= 68 k
R
DC
= 130 k
R
DC
=
= ILON
= ILOFF
= ILON
= ILOFF
at line impedance = 600
at line impedance = 900
Absolute Maximum Ratings
Stresses beyond those listed under “Absolute Maximum Ratings” may cause permanent damage to the device. This is a stress rating
only and functional operation of the device at these or any other conditions beyond those indicated in the operational sections of this
specification is not implied. Exposure to absolute maximum rating conditions for extended periods may affect device reliability.
Parameters
Symbol
Line current
I
L
DC line voltage
V
L
Maximum input current, pin 17
I
RING
Junction temperature
T
j
Ambient temperature
T
amb
Storage temperature
T
stg
Total power dissipation, T
amb
= 60 C
P
tot
Value
140
12
15
125
-25 to +75
-55 to +150
0.9
Unit
mA
V
mA
C
C
C
W
Thermal Resistance
Parameters
Junction ambient SSO44
Symbol
R
thJA
Value
70
Unit
K/W
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