L8576B Datasheet, PDF (13/26 Pages) Agere Systems – Dual Ringing SLIC

Data Sheet
May 2001
L8576B Dual Ringing SLIC
Electrical Characteristics (continued)
Table 7. ac Feed Characteristics (continued)
Parameter¹
Gain vs. Level (transmit and receive; 0 dBV reference)²:
–50 dB to +3 dB
Return Loss³:
200 Hz—500 Hz
500 Hz—3400 Hz
Transhybrid Loss³:
200 Hz—500 Hz
500 Hz—2500 Hz
2500 Hz—3400 Hz
Idle-channel Noise (Tip/Ring):
Psophometric²
C-message
3 kHz Flat²
Idle-channel Noise (XMT):
Psophometric²
C-message
3 kHz Flat²
Min Typ
–0.05
0
20
24
26
29
20
24
26
29
26
29
—
—
—
—
—
—
—
—
—
—
—
—
Max
Unit
0.05
dB
—
dB
—
dB
—
dB
—
dB
—
dB
–77
dBmp
12
dBrnC
20
dBrn
–77 dBmp0
12 dBrnC0
20
dBrn0
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
Interchannel Small-signal Crosstalk. (Both channels in forward or reverse — –90
battery state.) (2-wire to 2-wire, 2-wire to 4-wire, 4-wire to 4-wire.)
Impulse Noise. (One channel ringing, other channel in forward or reverse —
40
battery state.)
1. These parameters are not tested in production. They are guaranteed by design and device characterization.
Max
Unit
–80
dB
47 dBrnC0
Table 9. Data Interface and Logic
Parameter¹
Symbol Min Typ
Max
Unit
High-level Input Voltage (B2, RNGNG, and NDISC)
VIH
2
—
VCC
V
Low-level Input Voltage (B2, RNGNG, and NDISC)
VIL
0
—
0.7
V
Input Bias Current (high) (B2, RNGNG, and NDISC)
IIH
–40
—
–100
µA
Input Bias Current (low) (B2, RNGNG, and NDISC)
IIL
–75
—
–200
µA
High-level Output Voltage (NSTAT, open collector with inter-
nal pull-up resistor):
(IOUT = –20 µA)
(IOUT = –1 µA)
VOH
2.4
4.3
VCC
V
VOH
—
5.0
—
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.
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