am79m576a Advanced Micro Devices, am79m576a Datasheet - Page 11

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

11. Total Harmonic distortion with metering is specified with a metering signal of 2.2 Vrms at the two-wire output, and a transmit
12. Noise with metering is measured by applying a 2.2 Vrms metering signal (measured at the two-wire output) and measuring
Z
Z
R
C
R
Z
T
RX
M
DC1
DC
D
signal of +3 dBm or receive signal of –4 dBm. The transmit or receive signals are single-frequency inputs, and the distortion
is measured as the highest in band harmonic at the two-wire or the four-wire output relative to the input signal.
the psophometric noise at the two-wire outputs over a 200 ms time interval.
=
=
=
=
=
+
510 Z
365
-------- - ,
--------------- -
V
I
V
0.98 Z
R
1.5 ms
T
M2W
MG
DC2
2WIN
Note:
* A logic Low on E0 disables DET output into the Open Collector state.
=
T
------------------------------------------------------------------------------------ -
Z
R
---------------------------------
R
State
50
T
–
DC1
DC1
C
+
0
1
2
3
4
5
6
7
2R
D
0.51 V K
R
+
=
F
FEED
R
R
0.5 ms
--------------- -
K
DC2
DC2
R
1
C3 C2 C1
D
0
0
0
0
1
1
1
1
–
1
2R
Z
0
0
1
1
0
0
1
1
L
F
Z
0
1
0
1
0
1
0
1
Table 2. User-Programmable Components
T
2R
F
+
Open Circuit
Ringing
Active
On-hook TX (OHT)
Tip Open
Reserved
Active Polarity Reversal
OHT Polarity Reversal
Z
L
Two-Wire Status
Table 1. SLIC Decoding
SLIC Products
Z
resistors are R
impedance. When computing Z
pole and any external stray capacitance between VTX and
RSN must be taken into account.
Z
equation sets the receive gain to 0 dB when the SLIC
terminates with an impedance equal to Z
R
pin. R
R
is the threshold current between on-hook and off-hook.
Z
V
2-wire output (usually 2.2 Vrms) and K
where: CX = The values of the identical capacitors from
K
T
RX
M
M2W
DC1
D
1
is connected between the VTX and RSN pins. The fuse
and C
is connected from V
is connected from V
=
, R
DC1
is the desired magnitude of the metering signal at the
2
=
DC2
D
Ring trip
Ring trip
Loop detector
Loop detector
Loop detector
Loop detector
Loop detector
Loop detector
--------------------------------------------------------------------------------------------------------
1
and R
form the network connected from RD to –5 V and I
, and C
+
metering frequency
j
A and B to GND
E0 = 1*
F
E1 = 0
, and Z
DC2
11.5 10
DC
are approximately equal.
form the network connected to the RDC
DET Output
2WIN
MG
RX
–
9
(metering source) to the RSN pin,
1000
is the desired two-wire AC input
to RSN. Z
+
CX
------- -
Ring trip
Ring trip
Ground key
Ground key
Ground key
Ground key
2
T
, the internal current amplifier
E0 = 1*
36
E1 = 1
—
—
T
+
1
is defined above. This
Z
(
2WIN
L
+
) is defined below.
2R
.
F
11
T