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AM79R70-1JC датащи(PDF) 11 Page - Advanced Micro Devices

номер детали AM79R70-1JC
подробное описание детали  Ringing Subscriber Line Interface Circuit
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производитель  AMD [Advanced Micro Devices]
домашняя страница  http://www.amd.com
Logo AMD - Advanced Micro Devices

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P R E L I M I N A R Y
SLIC Products
11
Table 2. User-Programmable Components
ZT is connected between the VTX and RSN pins. The fuse resistors are
RF, and Z2WIN is the desired 2-wire AC input impedance. When
computing ZT, the internal current amplifier pole and any external stray
capacitance between VTX and RSN must be taken into account.
ZRX is connected from VRX to RSN. ZT is defined above, and G42L is the
desired receive gain.
RDC1, RDC2, and CDC form the network connected to the RDC pin.
ILOOP is the desired loop current in the constant-current region.
RDCR1, RDCR2, and CDCR form the network connected to the RDCR pin.
See Applications Circuit for these components.
CDCR sets the ringing time constant, which can be between 15 µs and
150 µs.
for high battery state
RD is the resistor connected from the RD pin to GND and RLTH is the
loop-resistance threshold between on-hook and off-hook detection. RD
should be greater than 56 k
Ω to guarantee detection will occur in the
Standby state. Choose the value of RD for high battery state; then use
the equation for RLTH to find where the threshold is for low battery.
Loop-Threshold Detect Equations
for high battery
This is the same equation as for RD in the preceding equation, except
solved for RLTH.
for low battery
For low battery, the detect threshold is slightly higher, which will avoid
oscillating between states.
RLTH standby < RLTH active VBAT1 < RLTH active VBAT2, 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
L
G
42L
------------
1000
Z
T
Z
T
500 Z
L
2R
F
+
()
+
--------------------------------------------------
=
R
DC 1
R
DC2
2500
I
LOOP
---------------
=
+
R
DC R1
R
DCR 2
+
3000
Iringlim
----------------------
=
C
DC
19 ms
R
DC 1
R
DC2
+
R
DC1 RDC 2
---------------------------------
=
C
DC R
R
DCR1
R
DC R2
+
R
DC R1RDCR2
----------------------------------------
• 150 µs
=
R
D
R
LTH
12.67
=
R
LTH
R
D
12.67
-------------
=
R
LTH
R
D
11.37
-------------
=
R
LTH
V
BAT1
10
915
-----------------------------
R
D
400
–2R
F
=


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