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| 型號(hào)： | HC55121IMZ |
| 廠商： | Intersil |
| 文件頁數(shù)： | 8/36頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC SLIC UNIVERSAL LP 28-PLCC |
| 標(biāo)準(zhǔn)包裝： | 37 |
| 系列： | UniSLIC14 |
| 功能： | 用戶線路接口概念（SLIC） |
| 電路數(shù)： | 1 |
| 電源電壓： | 4.75 V ~ 5.25 V |
| 電流 - 電源： | 2.25mA |
| 功率（瓦特）： | 1.5W |
| 工作溫度： | -40°C ~ 85°C |
| 安裝類型： | 表面貼裝 |
| 封裝/外殼： | 28-LCC（J 形引線） |
| 供應(yīng)商設(shè)備封裝： | 28-PLCC（11.51x11.51） |
| 包裝： | 管件 |
| 包括： | 電池跟蹤抗削頂失真，回路和接地鍵檢測(cè)，振鈴控制 |
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16
FN4659.13
June 1, 2006
Off Hook Overhead Voltage
The off hook overhead
voltage VOH(off) at Load is
also independent of the VBH
battery voltage and remains
constant over temperature.
The required off hook
overhead voltage is the sum
of the AC and DC voltage
drops across the internal
sense resistors (RS), the
protection resistors (RP), the required (peak) off hook
voltage for speech (Vsp(off)) and the required (peak) off hook
voltage for the pulse metering (Vpm(off)), if applicable.
The off hook overhead voltage is defined in Equation 2 and
calculated using Equation 3.
where:
VOH(off) at Load = Off hook overhead voltage at load
VOH(Rsense) = Required overhead for the DC voltage drop
across sense resistors (2RS x Iloop(max))
Vsp(off) = Required (peak) off hook AC voltage for speech
Vpm(off) = Required (peak) off hook AC voltage for pulse
metering
where:
80 = 2Rs + 2RINT (reference Figure 17)
Zpm = Pulse metering load impedance (typically 200).
2.0V = Additional off hook overhead voltage requirement
RSAT Resistance Calculation
The RSAT 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 RSAT value for the off
hook conditions and then verify that the on hook conditions
are also satisfied.
When considering the Off
hook condition, RSAT is equal
to VOH(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,
Vsp(off) = 3.2VPEAK,
Vspm(off) = 0VPEAK,
VOH(off) at Load = 8.34V the
value of RSAT(off) is equal to 417 as calculated in Equation 4.
Before using this RSAT 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
RSAT (RSAT(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, Vsp(on) = 0.775VRMS
Thus, the on hook overhead
requirements of 2.85V will be
met if we use the RSAT(off) value.
If the on hook overhead requirement is not met, then we
need to use the RSAT(on) value to determine the RDC_RAC
resistor value. The external saturation guard resistor
RDC_RAC is equal to 50 times RSAT.
In the example above RSAT 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
RD and is calculated using Equation 7. For the above
VBH
VSAT
VOH(off)
2.5V
OFF HOOK
TIP
T
O
RIN
G
V
O
L
T
AGE
LOOP CURRENT
ILOOP(min)
DC FEED CURVE
OVER HEAD
(EQ. 2)
V
OH off
() at Load
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
P
2R
S
+
Z
L
------------------------------
+
×
+
=
+ V
pm off
()
1
2R
P
2R
S
+
Z
pm
------------------------------
+
×
2.0V
+
VBH
VSAT
VOH(off)
2.5V
TIP
T
O
RING
VOL
T
AGE
LOOP CURRENT
ILOOP(min)
VOH(off) AT LOAD
ILOOP(min)
RSAT
DC FEED CURVE
R
SAT(off) =
V
OH(off) at Load
I
LOOP(min)
----------------------------------------
8.34V
20mA
----------------
417
==
(EQ. 4)
VOH(on) AT LOAD
ISH-(min)
RSAT
VBH
VSAT
VOH(on)
2.5V
ISH-(min)
LOOP CURRENT
DC FEED CURVE
T
IP
T
O
RING
V
O
L
T
AGE
R
SAT on
()
2.85V
7.2mA
------------------
395
==
RSAT
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)
HC55120, HC55121, HC55130, HC55140, HC55142, HC55143, HC55150
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