Data Sheet
May 2001
L8576B Dual Ringing SLIC
Electrical Characteristics (continued)
Table 7. ac Feed Characteristics (continued)
Parameter1
Min
Typ
Max
Unit
Gain vs. Level (transmit and receive; 0 dBV reference)2:
–50 dB to +3 dB
–0.05
0
0.05
dB
Return Loss3:
200 Hz—500 Hz
500 Hz—3400 Hz
20
26
24
29
—
—
dB
dB
Transhybrid Loss3:
200 Hz—500 Hz
500 Hz—2500 Hz
2500 Hz—3400 Hz
20
26
26
24
29
29
—
—
—
dB
dB
dB
Idle-channel Noise (Tip/Ring):
Psophometric2
—
—
—
—
—
—
–77
12
20
dBmp
dBrnC
dBrn
C-message
3 kHz Flat2
Idle-channel Noise (XMT):
Psophometric2
C-message
—
—
—
—
—
—
–77
12
20
dBmp0
dBrnC0
dBrn0
3 kHz Flat2
1. Requires external components connected as shown in Figure 2. Transmission characteristics are specified assuming a 600 Ω resistive ter-
mination and ±1% external resistors.
2. This parameter is not tested in production. It is guaranteed by design and device characterization.
3. Return loss and transhybrid loss are functions of device gain accuracies and the external hybrid circuit. Guaranteed performance assumes
1% tolerance components.
Table 8. Isolation Between Channels
Parameter1
Min
Typ
Max
Unit
Interchannel Small-signal Crosstalk. (Both channels in forward or reverse
battery state.) (2-wire to 2-wire, 2-wire to 4-wire, 4-wire to 4-wire.)
—
–90
–80
dB
Impulse Noise. (One channel ringing, other channel in forward or reverse
battery state.)
—
40
47
dBrnC0
1. These parameters are not tested in production. They are guaranteed by design and device characterization.
Table 9. Data Interface and Logic
Parameter1
Symbol
Min
Typ
Max
Unit
High-level Input Voltage (B2, RNGNG, and NDISC)
Low-level Input Voltage (B2, RNGNG, and NDISC)
Input Bias Current (high) (B2, RNGNG, and NDISC)
Input Bias Current (low) (B2, RNGNG, and NDISC)
VIH
VIL
IIH
2
—
—
—
—
VCC
0.7
V
V
0
–40
–75
–100
–200
µA
µA
IIL
High-level Output Voltage (NSTAT, open collector with inter-
nal pull-up resistor):
(IOUT = –20 µA)
(IOUT = –1 µA)
VOH
VOH
2.4
—
4.3
5.0
VCC
—
V
V
Low-level Output Voltage (NSTAT, open collector with internal
VOL
0
0.2
0.4
V
pull-up resistor) (IOUT = 200 µA)
1. All logic voltages are referenced to AGND.
Agere Systems Inc.
13
AGERE [ AGERE SYSTEMS ]
