am79m576a Advanced Micro Devices, am79m576a Datasheet - Page 10

• Manufacturer Part Number: am79m576a
• Description: Metering Subscriber Line Interface Circuit
• Manufacturer: Advanced Micro Devices

SWITCHING WAVEFORMS
Notes:
*
1. Unless otherwise noted, test conditions are BAT = 48 V (voltage at chip VBAT pin = –47.3 V), V
2. 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. These tests are performed with a longitudinal impedance of 90
6. This parameter is tested at 1 kHz in production. Performance at other frequencies is guaranteed by characterization.
7. When the SLIC is in the anti-sat 2 operating region, this parameter will be degraded. The exact degradation will depend on
8. “Midpoint” is defined as the connection point between two 300
9. Fundamental and harmonics from 256 kHz switch regulator chopper are not included.
10. Calculate loop current limit, which depends upon the programmed apparent open circuit voltage and the feed resistance, is
10
Note:
All delays measured at 1.4 V level.
E0 to DET
E1 to DET
When any power supplies to the MSLIC are removed and the MSLIC is not in the Ringing state, the relay driver must not
activate when the relay coil connected to VCCRING is supplied by the same V
If the relay coil connected to VCCRING is supplied by a voltage other than the V
– Provide redundancy of V
– As an alternative, limit the current flowing to all digital inputs to less than 1 mA.
R
impedance programming impedance (Z
(See Table 2 for component formulas.) Operation in polarity reverse is tested in production.
matches the impedance programmed by Z
135
system design. The anti-sat 2 region occurs at high loop resistances when |V
as follows:
In OHT state: I
In Active state: I
L
= 600 , C
for frequencies >12 kHz. These tests are extremely sensitive to circuit board layout. Refer to application notes for details.
DET
DET
E1
E0
E1
HP
LIMIT
LIMIT
= 0.22 F, R
= 0.202 and
= 0.68
tgkde
tshdd
CC
DC1
from the supply voltage of the relay
= R
DC2
T
) = 306 k
= 18.7 k , C
50
------------------------------------------- -
tshd0
T
.
tshde
Am79M576A Data Sheet
V
TX
R
APPARENT
DC
by V
resistive, receive input summing impedance (Z
DC
RX
= 0.15 F, R
. This specification assumes that the two-wire AC load impedance
and metallic impedance of 300
series resistors connected between A(TIP) and B(RING).
d
= 57.6 k , no fuse resistors, two-wire AC output
tgkde
BAT
| – |V
CC
tgkdd
CC
used for powering the MSLIC.
AX
used for powering the MSLIC, you must:
– V
BX
| is less than approximately 13 V.
tshde
for frequencies < 12 kHz and
tgkd0
CC
= +5 V, V
RX
) = 300 k resistive.
EE
= –5 V,