L9218A Просмотр технического описания (PDF) - Agere -> LSI Corporation
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L9218A Datasheet PDF : 30 Pages
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Data Sheet
November 2001
L9218A/G Low-Cost Line Interface
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:
Allowed Range Including Tolerance3
Accuracy (RLOOP = 100 Ω, VBAT = –48 V)
Powerup Open Loop Voltage Levels:
Common-mode Voltage
Differential Voltage VBAT = –48 V4 (Gain = 2)
Differential Voltage VBAT = –48 V4 (Gain = 7.86)
Disconnect State:
Leakage
dc Feed Resistance (for ILOOP below regulation level) (does
not include protection resistor)
Loop Resistance Range (–3.17 dBm overload into
900 Ω; not including protection):
ILOOP = 20 mA at VBAT = –48 V
Longitudinal to Metallic Balance—IEEE ® Std. 455
(See Figure 7)5:
200 Hz to 3400 Hz
Metallic to Longitudinal Balance (open loop):
200 Hz to 4 kHz
RFI Rejection (See Figure 8)3, 0.5 Vrms, 50 Ω Source,
30% AM Mod 1 kHz:
500 kHz to 100 MHz
Min
80
15
8.5
15
—
—
|VBAT + 7.5|
|VBAT + 8.0|
—
—
1800
58
40
—
—
Typ
—
—
15
—
±5
VBAT/2
|VBAT + 6.5|
|VBAT + 6.5|
10
80
—
61
—
—
–55
Max
—
—
—
45
—
—
|VBAT + 5.9|
|VBAT + 5.9|
150
100
—
—
—
—
–45
Unit
mA
mArms
mArms
mA
%
V
V
V
µA
Ω
Ω
dB
dB
—
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 13).
3. This parameter is not tested in production. It is guaranteed by design and device characterization.
4. Specification is reduced to |VBAT1 + 10.5 V| minimum when VBAT1 = –70 V at 85 °C.
5. Longitudinal balance of circuit card will depend on loop series protection resistor matching and magnitude. More information is available in
the Applications section of this document.
Agere Systems Inc.
9
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