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參數(shù)資料
| 型號(hào)： | AM79R70 |
| 廠商： | Advanced Micro Devices, Inc. |
| 英文描述： | Ringing Subscriber Line Interface Circuit |
| 中文描述： | 振鈴用戶線接口電路 |
| 文件頁數(shù)： | 11/17頁 |
| 文件大小： | 271K |
| 代理商： | AM79R70 |
P R E L I M I N A R Y
SLIC Products
11
Table 2. User-Programmable Components
Z
T
is connected between the VTX and RSN pins. The fuse resistors are
R
F
, and Z
2WIN
is the desired 2-wire AC input impedance. When
computing Z
T
, the internal current amplifier pole and any external stray
capacitance between VTX and RSN must be taken into account.
Z
RX
is connected from V
RX
to R
SN
. Z
T
is defined above, and G
42L
is the
desired receive gain.
R
DC1
, R
DC2
, and C
DC
form the network connected to the RDC pin.
I
LOOP
is the desired loop current in the constant-current region.
R
DCR1
, R
DCR2
, and C
DCR
form the network connected to the RDCR pin.
See Applications Circuit for these components.
C
DCR
sets the ringing time constant, which can be between 15 μs and
150 μs.
for high battery state
R
D
is the resistor connected from the RD pin to GND and R
LTH
is the
loop-resistance threshold between on-hook and off-hook detection. R
D
should be greater than 56 k
to guarantee detection will occur in the
Standby state. Choose the value of R
D
for high battery state; then use
the equation for R
LTH
to find where the threshold is for low battery.
Loop-Threshold Detect Equations
for high battery
This is the same equation as for R
D
in the preceding equation, except
solved for R
LTH
.
for low battery
For low battery, the detect threshold is slightly higher, which will avoid
oscillating between states.
R
LTH
standby < R
LTH
active V
BAT1
< R
LTH
active V
BAT2
, which will
guarantee no unstable states under all operating conditions. This
equation will show at what resistance the standby threshold will be; it is
actually a current threshold rather than a resistance threshold, which is
shown by the Vbat dependency.
Z
T
500 Z
2WIN
2R
F
–
)
=
Z
RX
Z
G
42L
-----------
1000
Z
+
Z
T
500 Z
L
2R
F
)
+
--------------------------------------------------
=
R
DC1
R
DC2
I
LOOP
2500
=
+
R
DCR1
R
DCR2
+
Iringlim
-----3000
=
C
DC
19 ms
R
R
DC1
R
DC2
R
+
---------------------------------
=
C
DCR
R
R
DCR1
R
DCR2
R
+
----------------------------------------
150
μ
s
=
R
D
R
LTH
12.67
=
R
LTH
R
12.67
------------
=
R
LTH
R
11.37
------------
=
R
LTH
V
10
915
–
-----------------------------
R
D
400
–
2R
F
–
=
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