Data Sheet
January 2000
L7556, L7557 Low-Power SLICs
with Battery Switch
Electrical Characteristics
(continued)
Table 6. Analog Pin Characteristics
Parameter
Differential PT/PR Current Sense (DCOUT):
Gain (PT/PR to DCOUT)
Loop Closure Detector Threshold
1
:
Programming Accuracy
Ring Ground Detector Threshold
2
:
R
ICM
= 154 kΩ
Programming Accuracy
Ring Trip Comparator:
Input Offset Voltage
RCVN, RCVP:
Input Bias Current
Min
–123
—
3
—
—
—
Typ
–125
—
6
—
—
–0.2
Max
–127
±20
10
±25
±10
–1
Unit
V/A
%
kΩ
%
mV
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 V
CC
.
Table 7. Uncommitted Op Amp Characteristics
Parameter
Input Offset Voltage
Input Offset Current
Input Bias Current
Differential Input Resistance
Output Voltage Swing (R
L
= 10 kΩ)
Output Resistance (A
VCL
= 1)
Small Signal GBW
Min
—
—
—
—
—
—
—
Typ
±5
±10
200
1.5
±3.5
2.0
700
Max
—
—
—
—
—
—
—
Unit
mV
nA
nA
MΩ
Vpk
Ω
kHz
Lucent Technologies Inc.
9
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