am79r70 Advanced Micro Devices, am79r70 Datasheet - Page 10

• Manufacturer Part Number: am79r70
• Description: Ringing Subscriber Line Interface Circuit
• Manufacturer: Advanced Micro Devices

Notes:
1. Unless otherwise noted, test conditions are BAT1 = –67 V, BAT2 = –24 V, V
2. a. Overload level is defined when THD = 1%.
3. Balance return signal is the signal generated at V
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 Z
7. Open Circuit V
8. R
9. Lower power is achieved by switching into low-battery state in standby. Standby loop current is returned to V
10
Notes:
* Only –1 performance grade devices support polarity reversal.
** For correct ground-start operation using Tip Open, V
R
two-wire AC input impedance (ZSL) is a 600
R
b. Overload level is defined when THD = 1.5%.
matches the programmed impedance.
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.
of the battery selected.
State
DC1
SGL
D
6*
7*
0
1
2
3
4
5
must be greater than 56 k . Refer to Table 2 for typical value of R
= 80 k , R
= open, R
C3 C2 C1
AB
0
0
0
0
1
1
1
1
SGH
DC2
can be modified using RSGH.
0
0
1
1
0
0
1
1
= 20 k , R
= open, R
0
1
0
1
0
1
0
1
DCR
D
Open Circuit
Ringing
Active
On-hook TX (OHT)
Tip Open
Standby
Active Polarity Reversal
OHT Polarity Reversal
= 75 k , no fuse resistors, C
VTX
RSN
= 2 k , R
RT1 = 150 k
RT2 = 150 k
2-Wire Status
RT1
P R E L I M I N A R Y
Table 1. SLIC Decoding
resistance synthesized by the programming network shown below.
Am79R70 Data Sheet
= 430 k , R
TX
T
network such as that shown in Note 1 above. The network reduces the
by V
BAT1
RX
RRX = 300 k
on-hook battery must be used.
. This specification assumes that the two-wire AC load impedance
Ring trip
Ring trip
Loop detector
Loop detector
Loop detector
Loop detector
Loop detector
Loop detector
RT2
HP
= 0.018 µF, C
= 12 k , C
E1 = 1
CT1 = 60 pF
LTH
(DET) Output
.
RT
~
CC
V
RX
DC
= 1.5 µF, R
= +5 V, V
Ring trip
Ring trip
Ground key
Ground key
Ground key
Ground key
Ground key
Ground key
= 1.2 µF, D
E1 = 0
NEG
SLEW
1
= –5 V, R
= D
= 150 k , C
2
= 1N400x,
Battery Selection
L
= 600 ,
B2EN = 1**
SLEW
BAT1
B2EN
V
B2EN
BAT1
= 0.33 µF.
regardless