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AM79R70-1JC Fiches technique(PDF) 10 Page - Advanced Micro Devices

No de pièce AM79R70-1JC
Description  Ringing Subscriber Line Interface Circuit
Download  17 Pages
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Fabricant  AMD [Advanced Micro Devices]
Site Internet  http://www.amd.com
Logo AMD - Advanced Micro Devices

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P R E L I M I N A R Y
10
Am79R70 Data Sheet
Notes:
1. Unless otherwise noted, test conditions are BAT1 = –67 V, BAT2 = –24 V, VCC = +5 V, VNEG = –5 V, RL = 600 Ω,
RDC1 = 80 kΩ, RDC2 = 20 kΩ, RD = 75 kΩ, no fuse resistors, CHP = 0.018 µF, CDC = 1.2 µF, D1 = D2 = 1N400x,
two-wire AC input impedance (ZSL) is a 600
Ω resistance synthesized by the programming network shown below.
RSGL = open, RSGH = open, RDCR = 2 kΩ, RRT1 = 430 kΩ, RRT2 = 12 kΩ, CRT = 1.5 µF, RSLEW = 150 kΩ, CSLEW = 0.33 µF.
2. a. Overload level is defined when THD = 1%.
b. Overload level is defined when THD = 1.5%.
3. Balance return signal is the signal generated at VTX by VRX. This specification assumes that the two-wire AC load impedance
matches the programmed impedance.
4. Not tested in production. This parameter is guaranteed by characterization or correlation to other tests.
5. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization.
6. Group delay can be greatly reduced by using a ZT network such as that shown in Note 1 above. The network reduces the
group delay to less than 2 µs and increases 2WRL. The effect of group delay on linecard performance may also be compensated
for by synthesizing complex impedance with the QSLAC or DSLAC device.
7. Open Circuit VAB can be modified using RSGH.
8. RD must be greater than 56 kΩ. Refer to Table 2 for typical value of RLTH.
9. Lower power is achieved by switching into low-battery state in standby. Standby loop current is returned to VBAT1 regardless
of the battery selected.
Table 1. SLIC Decoding
(DET) Output
State
C3 C2 C1
2-Wire Status
E1 = 1
E1 = 0
Battery Selection
0
0
0
0
Open Circuit
Ring trip
Ring trip
B2EN
1
0
0
1
Ringing
Ring trip
Ring trip
2
0
1
0
Active
Loop detector
Ground key
3
0
1
1
On-hook TX (OHT)
Loop detector
Ground key
4
1
0
0
Tip Open
Loop detector
Ground key
B2EN = 1**
5
1
0
1
Standby
Loop detector
Ground key
VBAT1
6*
1
1
0
Active Polarity Reversal
Loop detector
Ground key
B2EN
7*
1
1
1
OHT Polarity Reversal
Loop detector
Ground key
Notes:
* Only –1 performance grade devices support polarity reversal.
** For correct ground-start operation using Tip Open, VBAT1 on-hook battery must be used.
RT2 = 150 k
CT1 = 60 pF
RT1 = 150 k
VTX
RSN
VRX
RRX = 300 k
~


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