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參數(shù)資料
| 型號(hào)： | MC33121 |
| 廠商： | Motorola, Inc. |
| 英文描述： | LOW VOLTAGE SUBSCRIBER LOOP INTERFACE CIRCUIT |
| 中文描述： | 低電壓用戶環(huán)路接口電路 |
| 文件頁(yè)數(shù)： | 8/32頁(yè) |
| 文件大小： | 570K |
| 代理商： | MC33121 |
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MC33121
8
MOTOROLA
Figure 5. Loop Current versus Loop
Resistance and RRF
Figure 6. Loop Current versus Loop
Resistance and RRF
Figure 7. Loop Current versus Loop
Resistance and RRF
Figure 8. Off–Hook to On–Hook
Threshold versus RRF
Figure 9. On–Hook to Off–Hook Threshold versus RS
Figure 10. IDD versus Loop Current
50
0
40
30
20
10
400
800
1200
1600
2000
I
RL, LOOP RESISTANCE (
)
50
0
40
30
20
10
200
400
600
800
1000
I
RL, LOOP RESISTANCE (
)
50
0
40
30
20
10
200
400
600
800
1000
I
RL, LOOP RESISTANCE (
)
15
3.0
13
11
9.0
5.0
4.0
5.0
6.0
RRF (k
)
7.0
10
5.0
5.0
4.0
3.0
2.0
1.0
6.0
7.0
RS, SENSE RESISTANCE (k
)
8.0
9.0
12
15
20
10
5.0
30
40
45
IL, LOOP CURRENT (mA)
7.0
8.0
9.0
10
11
L
)
L
)
D
I
,
RRF = 3900
8200
7500
6200
4700
5100
10 k
RS = 9.1 k
VEE = –42 V
TA = 25
°
C
8200
7500
6200
4700
5100
10 k
RS = 9.1 k
VEE = –28 V
TA = 25
°
C
RRF = 3900
RRF = 3900
8200
7500
6200
4700
5100
10 k
RS = 9.1 k
VEE = –24 V
TA = 25
°
C
–42 V
≤
VEE
≤
–24 V
5.1 k
≤
RS
≤
11 k
4.5 V
≤
VDD
≤
5.5 V
TA = 25
°
C
–42 V
≤
VEE
≤
–24 V
TA = 25
°
C
VDD = +5.0 V
RRF = 4700
3.9 k
≤
RRF
≤
10 k
4.5 V
≤
VDD
≤
5.5 V
TA = 25
°
C
VEE = –24 V
VEE = –42 V
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