Data Sheet
March 1997
L7554 Low-Power SLIC
Electrical Characteristics (continued)
Table 8. ac Feed Characteristics
Parameter
ac Termination Impedance1
Longitudinal Impedance2
Min
150
—
Typ
—
Max
1300
46
Unit
Ω
40
Ω
Total Harmonic Distortion—200 Hz to 4 kHz2
—
—
—
—
0.3
1.0
%
%
Off-hook
On-hook
Transmit Gain, f = 1 kHz (PT/PR to VITR)
Transmit Accuracy in dB, 25 °C
Transmit Accuracy in dB, Full Temperature Range
—
–0.15
–0.22
–400
0
0
—
0.15
0.22
V/A
dB
dB
Receive + Gain, f = 1 kHz (RCVP to PT/PR)
Receive – Gain, f = 1 kHz (RCVN to PT/PR)
Receive Accuracy in dB, 25 °C
—
—
–0.18
–0.25
8.00
–8.00
0
—
—
0.18
0.25
–
–
dB
dB
Receive Accuracy in dB, Full Temperature Range
0
Gain vs. Frequency (transmit and receive)
(600 Ω termination; reference 1 kHz2
)
–1.00
–0.3
–0.5
—
0.0
0.0
–0.1
—
0.05
0.05
0.3
dB
dB
dB
dB
200 Hz to 300 Hz
300 Hz to 3.4 kHz
3.4 kHz to 16 kHz
16 kHz to 266 kHz
2.0
2
)
Gain vs. Level (transmit and receive)(reference 0 dBV
–50 dB to +3 dB
–0.05
0
0.05
dB
Return Loss3
20
26
24
29
—
—
dB
dB
200 Hz to 500 Hz
500 Hz to 3400 Hz
2-wire Idle-channel Noise (600 Ω termination)
Psophometric
C-message
3 kHz Flat
—
—
—
–87
2
10
–77
12
20
dBmp
dBrnC
dBrn
Transmit Idle-channel Noise
Psophometric
C-message
—
—
—
–82
7
15
–77
12
20
dBmp
dBrnC
dBrn
3 kHz flat
Transhybrid Loss3
200 Hz to 500 Hz
500 Hz to 3400 Hz
21
26
24
29
—
—
dB
dB
1. Set by external components. Any complex impedance R1 + R2 || C between 150 Ω and 1300 Ω can be synthesized.
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 of external components.
10
Lucent Technologies Inc.
AGERE [ AGERE SYSTEMS ]
