Data Sheet
March 1997
L7554 Low-Power SLIC
Electrical Characteristics (continued)
Table 6. Analog Pin Characteristics
Parameter
Min
Typ
Max
Unit
Differential PT/PR Current Sense (DCOUT)
Gain (PT/PR to DCOUT)
Offset Voltage @ ILOOP = 0, VBAT = –48 V
–119
–200
–125
—
–127
200
V/A
mV
Loop Closure Detector Threshold1
Programming Accuracy
—
—
±20
%
Ring Ground Detector Threshold2
RICM = 83 kΩ
3
6
10
kΩ
—
—
±25
%
Programming Accuracy
Ring Trip Comparator
Input Offset Voltage
—
—
—
±10
mV
RCVN, RCVP
Input Bias Current
–0.2
–1
µA
1. Loop closure threshold is programmed by resistor RLCTH from pin LCTH to pin DCOUT.
2. Ring ground threshold is programmed by resistor RICM2 from pin ICM to VCC.
Table 7. Uncommitted Op Amp Characteristics
Parameter
Min
Typ
Max
Unit
Input Offset Voltage
Input Offset Current
Input Bias Current
—
—
—
—
±5
—
—
—
—
mV
nA
nA
±10
200
1.5
Differential Input Resistance
MΩ
Output Voltage Swing (RL = 10 kΩ)
Output Resistance (AVCL = 1)
—
—
±3.5
2.0
—
—
Vpk
Ω
Small Signal GBW
—
700
—
kHz
Lucent Technologies Inc.
9
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