Data Sheet
May 2001
L8576B Dual Ringing SLIC
Electrical Characteristics (continued)
Table 6. Analog Signal Pins
Parameter
Min
Typ
Max
Unit
Differential PT/PR Current Sense (DCOUT)
Gain (PT/PR to DCOUT):
Forward Battery (RGX1 = 16.9 kΩ, RGX2 = 7.5 kΩ)
Reverse Battery (RGX1 = 16.9 kΩ, RGX2 = 7.5 kΩ)
–235
235
–250
250
–265
265
V/A
V/A
PT/PR to VITR Gain with
RGX1 = 16.9 kΩ, RGX2 = 7.5 kΩ:
Forward Battery
–121
121
–125
125
–129
129
V/A
V/A
Reverse Battery
Loop Closure Detector Threshold:
Programming Accuracy
—
—
±20
%
RCVN, RCVP:
Input Bias Current
Gain RCVP to PT/PR
Gain RCVN to PT/PR
—
11.62
–11.62
—
12
–12
–1.0
12.38
–12.38
µA
—
—
RCVN, RCVP Input Compliance
–2.5
—
VCC
V
Table 7. ac Feed Characteristics
Parameter1
Min
Typ
Max
Unit
ac Termination Impedance2
300
600
1000
Ω
Total Harmonic Distortion (200 Hz—4 kHz)3:
Off-hook
On-hook
—
—
—
—
0.3
1.0
%
%
Transmit Gain (ƒ = 1 kHz) (See Figure 5.):
Transmit Accuracy in Percent
–3.0
–0.24
0
0
3.0
0.24
%
dB
Transmit Accuracy in dB (relative to 2/3)
Receive Gain (ƒ = 1 kHz) (See Figure 5.):
Receive Accuracy in Percent
Receive Accuracy in dB
–3.0
–0.24
0
0
3.0
0.24
%
dB
Tip/Ring Signal Level (600 Ω reference)
Gain vs. Frequency (transmit and receive; 1 kHz reference)3:
—
—
3.14
dBm
200 Hz—3.4 kHz
300 Hz—3.4 kHz
3.4 kHz—20 kHz
3.4 kHz—266 kHz
–1.00
–0.30
–3.0
—
0
0
–0.1
—
0.05
0.05
2.0
dB
dB
dB
dB
2.0
1. Requires external components connected as shown in the Applications section. Transmission characteristics are specified assuming a 600 Ω
resistive termination and ±1% external resistors.
2. Transmission characteristics are specified assuming a 600 Ω resistive termination; however, feedback using external components allows the
user to adjust the termination impedance from 600 Ω. Any complex impedance R1 + R2 || C between 300 Ω and 1000 Ω can be synthesized
using external components.
3. This parameter is not tested in production. It is guaranteed by design and device characterization.
12
Agere Systems Inc.
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