參數(shù)資料
型號(hào)： AM7945
廠商： Advanced Micro Devices, Inc.
英文描述： Subscriber Line Interface Circuit
中文描述： 用戶線接口電路
文件頁數(shù)： 6/18頁
文件大?。?/td> 157K
代理商： AM7945
6
Am7945 Data Sheet
ELECTRICAL CHARACTERISTICS
The Am7945 device is tested under the following conditions unless otherwise noted: BAT =
–
48 V, V
CC
= +5 V,
V
EE
=
–
5 V, R
L
= 900
. The device is not tested in Polarity Reversal state.
Description
Test Conditions (See Note 1)
Min
Typ
Max
Unit
Note
Analog output (V
TX
) impedance
Analog output (V
TX
) offset
3
0
°
C to +70
°
C
–
40
°
C to +85
°
C
–
37
–
40
+37
+40
mV
4
Analog (RSN) input impedance
300 Hz to 3.4 kHz
1
20
4
Longitudinal impedance at A or B
35
Overload level
4-wire and 2-wire, Active state
–
2.5
+2.5
Vpk
2a
On hook, R
LAC
= 900
,
Active or OHT state
0.95
Vrms
2b
Transmission Performance
2-wire return loss
(See Test Circuit D)
200 to 3.4 kHz
26
dB
4, 8
Longitudinal Balance (2-Wire and 4-Wire, See Test Circuit C); R
L
= 740
at BAT = 48 V
Longitudinal to metallic L-T, L-4
normal polarity
200 Hz to 1 kHz
0
°
C to +70
°
C
–
40
°
C to +85
°
C
52
50
dB
4
1 kHz to 3.4 kHz
0
°
C to +70
°
C
–
40
°
C to +85
°
C
52
50
4
Longitudinal signal generation 4-L
300 Hz to 800 Hz, normal polarity
40
Longitudinal current per pin
Active state and OHT state
20
27
mArms
Insertion Loss (2- to 4-Wire and 4- to 2-Wire, See Test Circuits A and B) BAT =
–
48 V, R
L
= 900
Gain accuracy
0 dBm, 1 kHz
0
°
C to +70
°
C
–
40
°
C to +85
°
C
–
0.15
–
0.20
+0.15
+0.20
dB
4
Gain accuracy, OHT state
–
10 dBm, On hook, R
LAC
= 900
300 to 3.4 kHz, relative to 1 kHz
–
1.0
+1.0
4
Variation with frequency
0
°
C to +70
°
C
–
40
°
C to +85
°
C
–
0.10
–
0.15
+0.10
+0.15
4
Gain tracking
+7 dBm to
–
55 dBm, reference 0 dBm
0
°
C to +70
°
C
–
40
°
C to +85
°
C
–
0.10
–
0.15
+0.10
+0.15
4
4
Balance Return Signal (4- to 4-Wire, See Test Circuit B) BAT =
–
48 V, R
L
= 900
Gain accuracy
0 dBm, 1 kHz
0
°
C to +70
°
C
–
40
°
C to +85
°
C
–
0.15
–
0.20
+0.15
+0.20
dB
3
4
Variation with frequency
300 to 3.4 kHz, relative to 1 kHz
0
°
C to +70
°
C
–
40
°
C to +85
°
C
–
0.10
–
0.15
+0.10
+0.15
3
4
Gain tracking
+3 dBm to
–
55 dBm, reference 0 dBm
0
°
C to +70
°
C
–
40
°
C to +85
°
C
–
0.10
–
0.15
+0.10
+0.15
3, 4
4
Group delay
f = 1 kHz
4
μs
4, 8
Total Harmonic Distortion (2- to 4-Wire or 4- to 2-Wire, See Test Circuits A and B) BAT =
–
48 V, R
L
= 900
Harmonic distortion
300 Hz to 3.4 kHz
2-wire level = +7 dBm
2-wire level = 0 dBm
–
64
–
55
–
50
–
40
dB
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