ATTL7554BP Просмотр технического описания (PDF) - Agere -> LSI Corporation
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ATTL7554BP Datasheet PDF : 28 Pages
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L7554 Low-Power SLIC
Data Sheet
March 1997
Electrical Characteristics (continued)
Table 5. 2-Wire Port
Parameter
Tip or Ring Drive Current
= dc + Longitudinal + Signal Currents
Signal Current
Longitudinal Current Capability per Wire1
dc Loop Current Limit2
RLOOP = 100 Ω
Programmability Range
Accuracy (20 mA < ILIM < 40 mA)
Powerup Open Loop Voltage Levels
Common-mode Voltage
Differential Voltage:
VBAT = –48 V, Temperature = 25 °C
VBAT = –72 V, Temperature = 85 °C (L7554BP)
Disconnect State
PT Resistance (VBAT < VPT < 0 V)
PR Resistance (VBAT < VPR < 0 V)
Ground Start State
PT Resistance
dc Feed Resistance (for ILOOP below regulation level)
Loop Resistance Range (–3.17 dBm overload into
600 Ω; not including protection)
ILOOP = 20 mA at VBAT = –48 V
ILOOP = 20 mA at VBAT = –24 V
Longitudinal to Metallic Balance—IEEE 3 Std. 455
(See Figure 7.)4
50 Hz to 1 kHz
1 kHz to 3 kHz
Metallic to Longitudinal Balance
200 Hz to 4 kHz
RFI Rejection (See Figure 8.)5
0.5 Vrms, 50 Ω Source, 30% AM Mod. 1 kHz
500 kHz to 100 MHz
Min
Typ
Max
Unit
65
—
15
—
8.5
15
—
mA
—
mArms
—
mArms
—
ILIM
—
mA
5
—
45
mA
—
—
±12
%
—
VBAT/2
—
V
|VBAT + 7.0| |VBAT + 6.5| |VBAT + 6.0|
V
|VBAT + 10.0| |VBAT + 6.8|
—
V
100
143
100
133
—
kΩ
—
kΩ
100
143
—
kΩ
90
113
133
Ω
1900
—
700
—
—
Ω
—
Ω
64
75
—
dB
60
70
—
dB
46
—
—
dB
—
–55
–45
dBV
1. The longitudinal current is independent of dc loop current.
2. Current-limit ILIM is programmed by a resistor, RPROG, from pin IPROG to DCOUT. ILIM is specified at the loop resistance where current limiting
begins (see Figure 25). Select RPROG (kΩ) = 1.67 x ILIM (mA).
3. IEEE is a registered trademark of The Institute of Electrical and Electronics Engineers, Inc.
4. Longitudinal balance of circuit card will depend on loop series resistance matching (see Figures 23 and 24).
5. This parameter is not tested in production. It is guaranteed by design and device characterization.
8
Lucent Technologies Inc.
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