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參數(shù)資料
| 型號： | HC55142 |
| 廠商： | Intersil Corporation |
| 英文描述： | Low Power Universal SLIC Family |
| 中文描述： | 低功耗通用用戶接口家庭 |
| 文件頁數(shù)： | 15/35頁 |
| 文件大?。?/td> | 382K |
| 代理商： | HC55142 |
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4-15
protection resistors (R
P
), the required (peak) off hook
voltage for speech (V
sp(off)
) and the required (peak) off hook
voltage for the pulse metering (V
pm(off)
), if applicable.
The off hook overhead voltage is defined in Equation 2 and
calculated using Equation 3.
V
OH off
)
at Load
where:
V
OH(off) at Load
= Off hook overhead voltage at load
V
OH
(R
sense
) = Required overhead for the DC voltage drop
across sense resistors (2R
S
x Iloop
(max)
)
V
sp(off)
= Required (peak) off hook AC voltage for speech
V
pm(off)
= Required (peak) off hook AC voltage for pulse
metering
where:
80 = 2R
s
+ 2R
INT
(reference Figure 17)
Z
pm
= Pulse metering load impedance (typically 200
).
2.0V = Additional off hook overhead voltage requirement
R
SAT
Resistance Calculation
The R
SAT
resistance of the DC feed curve is used to
determine the value of the RDC_RAC resistor (Equation 6).
The value of this resistor has an effect on both the on hook
and off hook overheads. In most applications the off hook
condition will dominate the overhead requirements.
Therefore, we’ll start by calculating the R
SAT
value for the off
hook conditions and then verify that the on hook conditions
are also satisfied.
When considering the Off
hook condition, R
SAT
is equal
to V
OH(off) at Load
divided by
Iloop
(min)
(Equation 4).
For the given system
requirements (recommended
application circuit in back of
data sheet): Iloop (min) =
20mA, Iloop (max) = 30mA,
V
sp(off)
= 3.2V
PEAK
,
V
spm(off)
= 0V
PEAK
,
V
OH(off) at Load
= 8.34V the
value of R
SAT(off)
is equal to 417
as calculated in Equation 4.
V
LOOP(min)
Before using this R
SAT
value, to calculate the RDC_RAC
resistor, we need to verify that the on hook requirements will
also be met.
The on hook overhead voltage
calculated with the off hook
R
SAT
(R
SAT(off)
), is given in
Equation 5 and equals 3.0V.
The on hook overhead
calculated with Equation 1
equals 2.85V for the given
system requirements
(recommended application
circuit in back of data sheet):
Switch Hook Detect threshold
= 12mA, ISH- = (0.6)12mA =
7.2mA, V
sp(on)
= 0.775V
RMS
Thus, the on hook overhead
requirements of 2.85V will be
met if we use the R
SAT(off)
value.
If the on hook overhead requirement is not met, then we
need to use the R
SAT(on)
value to determine the RDC_RAC
resistor value. The external saturation guard resistor
RDC_RAC is equal to 50 times R
SAT
.
In the example above R
SAT
would equal 417
and
RDC_RAC would then equal to 20.85k
(closest standard
value is 21k
).
The Switch Hook Detect threshold current is set by resistor
R
D
and is calculated using Equation 7. For the above
example R
D
is calculated to be 41.6k
(500/12mA). The
next closest standard value is 41.2k
.
R
D
=I
SHD
The true value of ISH-, for the selected value of R
D
is given
by Equation 8:
Fortheexampleabove,ISH-equals7.28mA(500x0.6/41.2K).
Verify that the value of ISH- is above the suspected line
leakage of the application. The UniSLIC family will provide a
constant on hook voltage level for leakage currents up to this
value of line leakage.
(EQ. 2)
V
OH Rsense
)
V
sp off
)
V
pm off
)
+
+
=
(EQ. 3)
V
OH(off) at Load
80
I
LOOP max
)
×
V
sp off
)
1
2R
-----------------------------
2R
S
+
L
+
×
+
=
+ V
pm off
)
1
2R
-----------------------------
2R
S
+
pm
+
×
2.0V
+
V
BH
V
SAT
V
OH(off)
2.5V
T
LOOP CURRENT
I
LOOP(min)
V
OH(off) AT LOAD
I
LOOP(min)
R
SAT
R
SAT
DC FEED CURVE
R
SAT(off)
=
---------------------------------------
----------------
417
=
=
(EQ. 4)
V
OH(on) AT LOAD
ISH-
(min)
R
SAT
V
BH
V
SAT
V
OH(on)
2.5V
ISH-(min)
LOOP CURRENT
DC FEED CURVE
T
R
SAT on
)
-----------------
395
=
=
R
SAT
V
OH on
)
ISH-
(
)
R
SAT off
)
(
)
=
(EQ. 5)
V
OH on
)
7.2mA
417
×
=
V
OH on
)
3.0V
=
RDC_RAC = 50 x R
SAT
(EQ. 6)
------------
(EQ. 7)
ISH- =R
D
---------
(0.6)
(EQ. 8)
HC55120, HC55121, HC55130, HC55131, HC55140, HC55141, HC55142, HC55143, HC55150, HC55151
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相關代理商/技術參數(shù) |
參數(shù)描述 |
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| HC55142IB | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Low Power Universal SLIC Family |
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| HC55142IM96 | 制造商:INTERSIL 制造商全稱:Intersil Corporation 功能描述:Low Power Universal SLIC Family |
| HC55142IMZ | 功能描述:電信線路管理 IC LW PWR SLIC POLV/MTRING 53DB RoHS:否 制造商:STMicroelectronics 產(chǎn)品:PHY 接口類型:UART 電源電壓-最大:18 V 電源電壓-最小:8 V 電源電流:30 mA 最大工作溫度:+ 85 C 最小工作溫度:- 40 C 安裝風格:SMD/SMT 封裝 / 箱體:VFQFPN-48 封裝:Tray |
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