L9218A 데이터 시트보기 (PDF) - Agere -> LSI Corporation
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L9218A Datasheet PDF : 30 Pages
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Data Sheet
November 2001
L9218A/G Low-Cost Line Interface
Electrical Characteristics (continued)
Table 7. ac Feed Characteristics
Parameter
ac Termination Impedance1
Longitudinal Impedance at PT/PR2
Total Harmonic Distortion—200 Hz to 4 kHz2:
Off-hook
On-hook
Transmit Gain, f = 1 kHz (PT/PR to VITR) (current limit)
L9218A, Open Loop:
Receive + Gain, f = 1 kHz (RCVP to PT/PR)3
Receive – Gain, f = 1 kHz (RCVN to PT/PR)3
L9218G, Open Loop:
Receive + Gain, f = 1 kHz (RCVP to PT/PR)4
Receive – Gain, f = 1 kHz (RCVN to PT/PR)4
Gain vs. Frequency (transmit and receive)
(600 Ω termination; reference 1 kHz2):
200 Hz to 300 Hz
300 Hz to 3.4 kHz
3.4 kHz to 16 kHz
16 kHz to 266 kHz
Gain vs. Level (transmit and receive)(reference 0 dBV2):
–55 dB to +3 dB
2-Wire Idle-channel Noise (600 Ω termination):
Psophometric2
C-message
3 kHz Flat2
Min
150
—
—
—
–391
7.62
–7.62
1.94
–1.94
–1.00
–0.3
–3.0
—
–0.05
—
—
—
Typ
—
0
—
—
–403
7.86
–7.86
2.00
–2.00
0.0
0.0
–0.1
—
0
–87
2
10
Max
Unit
1300
Ω
—
Ω
0.3
%
1.0
%
–415
V/A
8.09
—
–8.09
—
2.06
—
–2.06
—
0.05
dB
0.05
dB
0.3
dB
2.5
dB
0.05
dB
–77
dBmp
12
dBrnC
20
dBrn
Transmit Idle-channel Noise:
Psophometric2
C-message
3 kHz Flat2
—
–82
–77
dBmp
—
7
12
dBrnC
—
15
20
dBrn
1. With a first-generation codec, this parameter is set by external components. Any complex impedance R1 + R2 || C between 150 Ω and
1300 Ω can be synthesized. With a third-generation codec, this parameter is set by a codec or by a combination of a codec and an external
network.
2. This parameter is not tested in production. It is guaranteed by design and device characterization.
3. Use this gain option with a first-generation or third-generation codec.
4. Use this gain option with an Agere third-generation codec.
Agere Systems Inc.
11
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