AM79M574-1JC ETC2 [List of Unclassifed Manufacturers], AM79M574-1JC Datasheet - Page 12

• Manufacturer Part Number: AM79M574-1JC
• Description: Metering Subscriber Line Interface Circuit
• Manufacturer: ETC2 [List of Unclassifed Manufacturers]

12
Z
Z
R
C
R
Z
T
RX
M
DCI
DC
D
=
=
=
=
=
+
510 Z
365
-------- -
-------------- -
V
R
I
V
---------- -
G
1.5 ms
T
M2W
Z
DC2
MG
42L
(
L
,
2WIN
C
•
=
•
D
-------------------------------------------------
Z
•
------------------------------------------------------------------------ -
Z
50 R
T
=
T
R
------------------------------- -
R
–
(
+
+
DC1
DC1
0.5 ms
---------------- -
2R
1000 Z
510 Z
0.51 K
FEED
R
D
F
+
K
•
)
(
R
1
R
•
•
( ) Z
–
L
DC2
DC2
ω
2R
+
T
1
( ) 2R
2R
F
ω
L
)
•
F
(
)
Table 2. User-Programmable Components
Z
T
F
+
Z
L
)
Am79M574 Data Sheet
Z
resistors are R
impedance. When computing Z
pole and any external stray capacitance between VTX and
RSN must be taken into account.
Z
above, and G
R
RDC pin. R
R
I
Z
V
2-wire output (usually 2.2 Vrms) and K
where: CX = The values of the identical capacitors
K
T
T
RX
M
M2W
DC1
D
1
is the threshold current between on-hook and off-hook.
( )
is connected between the VTX and RSN pins. The fuse
is connected from V
and C
ω
is connected from V
, R
is the desired magnitude of the metering signal at the
=
DC2
ω
D
-------------------------------------------------------------------------------------------------------------- -
1
form the network connected from RD to –5 V and
DC1
+
, and C
=
42L
jω 11.5 10
from A and B to GND
F
2 π •
, and Z
and R
(
is the desired receive gain.
DC
metering frequency
•
DC2
form the network connected to the
2WIN
MG
RX
–
are approximately equal.
9
(metering source) to the RSN pin,
is the desired 2-wire AC input
to the RSN pin, Z
+
1000
CX 2 ⁄
T
, the internal current amplifier
) 36
(
1
( )
ω
+
Z
L
is defined below.
T
+
is defined
2R
F
)