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AM79M574JC データシート(PDF) 11 Page - List of Unclassifed Manufacturers

部品番号 AM79M574JC
部品情報  Metering Subscriber Line Interface Circuit
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SLIC Products
11
Notes:
1. Unless otherwise noted, test conditions are BAT = –48 V, V
CC = +5 V, VEE = –5 V, RL = 600 Ω, CHP = 0.22 µF,
RDC1 = RDC2 = 20 kΩ, CDC = 0.1 µF, Rd = 51.1 kΩ, no fuse resistors, two-wire AC output impedance, programming impedance
(ZT) = 306 kΩ resistive, receive input summing impedance (ZRX) = 300 kΩ resistive. (See Table 2 for
component formulas.)
2. Overload level is defined when THD = 1%.
3. Balance return signal is the signal generated at VTX by VRX. This specification assumes that the two-wire AC load impedance
matches the impedance programmed by ZT.
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
Ω and metallic impedance of 300 Ω for frequencies below
12 kHz and 135
Ω for frequencies greater than 12 kHz. These tests are extremely sensitive to circuit board layout.
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 is degraded. The exact degradation depends on system
design. The Anti-sat 2 region occurs at high loop resistances when
VBAT–VAX – VBXis less than approximately 17V.
8. "Midpoint" is defined as the connection point between two 300
Ω series resistors connected between A(TIP) and B(RING).
9. Fundamental and harmonics from 256 kHz switch-regulator chopper are not included.
10. Loop-current limit which depends upon the programmed apparent open circuit voltage and the feed resistance is calculated
as follows:
In OHT state:
In Active state:
11. Total harmonic distortion with metering as specified with a metering signal of 2.2 Vrms at the two-wire output, and a transmit
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.
12. Noise with metering is measured by applying a 2.2 Vrms metering signal (measured at the two-wire output) and measuring
the psophometric noise at the two-wire and four-wire outputs over a 200 ms time interval.
13. Tested with 0
Ω source impedance. 2 MΩ is specified for system design purposes only.
14. Assumes the following ZT network:
15. Group delay can be considerably reduced by using a Z
T network such as that shown in Note 14. The network reduces the
group delay to less than 2
µs. The effect of group delay on linecard performance may be compensated for by using the
QSLAC™ or DSLAC™ devices.
Note:
* Logic Low on E0 disables the DET output into the open-collector state.
Table 1. SLIC Decoding
DET Output
State
C3 C2 C1
Two-Wire Status
E0 = 1*
E1 = 0
E0 = 1*
E1 = 1
0
0
0
0
Open Circuit
Ring trip
Ring trip
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
5
1
0
1
Reserved
Loop detector
6
1
1
0
Active Polarity Reversal
Loop detector
Ground key
7
1
1
1
OHT Polarity Reversal
Loop detector
Ground key
I
LIMIT
0.5
=
V
apparent
R
FEED
---------------------
I
LIMIT
0.8
=
V
apparent
R
FEED
---------------------
VTX
RSN
153 k
153 k
56 pF


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