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| 型號： | IDT821621J |
| 廠商： | INTEGRATED DEVICE TECHNOLOGY INC |
| 元件分類： | 模擬傳輸電路 |
| 英文描述： | LONG HAUL SLIC |
| 中文描述： | TELECOM-SLIC, PQCC32 |
| 封裝： | PLASTIC, LCC-32 |
| 文件頁數(shù)： | 11/21頁 |
| 文件大?。?/td> | 322K |
| 代理商： | IDT821621J |
Functional Description
9
October 8, 2003
IDT821621
LONG HAUL SLIC
calculated by the equation below:
Where, f
C
is the desired filter cut-off frequency.
IMPEDANCE MATCHING
The two-wire AC input impedance R
2WIN
is programmed by means
of an external impedance (R
T
) connected between the RSN and VTX
pins (see
Figure 13
). R
T
is calculated by the following equation:
Where, R
F
is the value of the fuse resistor. Note that when computing
R
T,
the internal current amplifier pole and any external stray capacitance
between the RSN and VTX pins must be taken into account.
RECEIVE GAIN SETTING
The 4-wire to 2-wire gain (G
42L
) is defined as the receive gain. It is
calculated by the following equation:
R
L
R
RX
R
T
250 R
L
+
+
Where, R
L
is the terminating impedance; R
RX
is connected between
VRX and RSN; R
T
is defined above; R
F
is the fuse resistor. See
Figure
11
for details.
THERMAL MANAGEMENT
The IDT821621 uses a power management technique of offloading
the thermal energy from the SLIC to an external resistor R
TMG.
R
TMG
is
connected between the TMG and VBAT pins as shown in
Figure 13
.
This resistor shares some of the loop current and limits the on-chip
power dissipation in Active state.
The selection of R
TMG
normally needs to satisfy the following
condition: with the programmed loop current being fed into a short circuit
loop from the nominal battery, all of the loop current is supplied by R
TMG.
So, R
TMG
can be calculated by the equation below:
V
8V
–
I
LOOP
The power dissipated in the resistor R
TMG
during Active state is:
The power dissipated in the SLIC during Active state is:
C
CAS
10
π
f
C
1.7
----------------------------
=
R
T
250 R
2WIN
2R
F
–
)
=
G
42L
----------
T
2R
F
)
------------------500R
=
R
TMG
--------------------------
70
–
≥
P
RTMG
V
-------------------------------–
8V
–
I
R
)
2
(
)
2
R
TMG
70
+
(
R
TMG
=
P
SLIC
V
BAT
I
L
P
RTMG
–
R
L
I
L
( )
2
–
0.12W
+
=
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