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參數(shù)資料
| 型號： | 6300 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | 500mA, 200MHz X DSL LINE DRIVER IN 16-LEAD SSOP PACKAGE |
| 中文描述： | 500mA的，200MHz的X的DSL線路驅(qū)動器，采用16引線SSOP封裝 |
| 文件頁數(shù)： | 8/16頁 |
| 文件大小： | 237K |
| 代理商： | 6300 |
8
LT6300
Logic Controlled Operating Current
The DSP controller in a typical xDSL application can have
I/O pins assigned to provide logic control of the LT6300
line driver operating current. As shown in Figure 4 one or
two logic control inputs can control two or four different
operating modes. The logic inputs add or subtract current
to the SHDN input to set the operating current. The one
logic input example selects the supply current to be either
full power, 10mA per amplifier or just 2mA per amplifier,
which significantly reduces the driver power consumption
APPLICATIOU
W
U
U
R
BIAS
(k
)
4
7
10
50
90
130
170
210
250
30
70
100
150
190
230
270 290
I
S
20
25
30
35
40
6300
F03
5
10
15
0
45
V
S
=
±
12V
V
+
= 12V
R
BIAS
SHDN
SHDNREF
R
BIAS
=
64 – 5k
V
+
– 1.2V
I
S
PER AMPLIFIER (mA)
I
S
PER AMPLIFIER
(mA)
64
V
+
– 1.2V
R
BIAS
+ 5k
≈
Figure 3. R
BIAS
to Ground Current Control
while maintaining less than 2
output impedance to
frequencies less than 1MHz. This low power mode retains
termination impedance at the amplifier outputs and the
line driving back termination resistors. With this termina-
tion, while a DSL port is not transmitting data, it can still
sense a received signal from the line across the back-
termination resistors and respond accordingly.
The two logic input control provides two intermediate
(approximately 7mA per amplifier and 5mA per amplifier)
operating levels between full power and termination
Two Control Inputs
RESISTOR VALUES (k
)
R
SHDN
TO V
CC
(12V)
3V
40.2
11.5
19.1
22.1
SUPPLY CURRENT PER AMPLIFIER (mA)
R
SHDN
TO V
LOGIC
3V
4.99
8.66
14.3
17.8
V
LOGIC
R
SHDN
R
C1
R
CO
V
C0
H
L
H
L
3.3V
43.2
13.0
5V
60.4
21.5
36.5
3.3V
6.81
10.7
5V
19.6
20.5
34.0
V
C1
H
H
L
L
10
7
5
2
10
7
5
2
10
7
5
2
10
7
5
2
10
7
5
2
10
7
5
2
One Control Input
RESISTOR VALUES (k
)
R
SHDN
TO V
CC
(12V)
3V
40.2
7.32
8.25
SUPPLY CURRENT PER AMPLIFIER (mA)
R
SHDN
TO V
LOGIC
3V
4.99
5.49
6.65
V
LOGIC
R
SHDN
R
C
V
C
H
L
3.3V
43.2
5V
60.4
13.7
3.3V
6.81
5V
19.6
12.7
10
2
10
2
10
2
10
2
10
2
10
2
R
SHDN
R
C1
V
C1
V
LOGIC
12V OR V
LOGIC
0V
V
C0
R
C0
SHDN
SHDNREF
2k
R
SHDN
R
C
V
C
V
LOGIC
12V OR V
LOGIC
0V
SHDN
SHDNREF
6300
F04
2k
Figure 4. Providing Logic Input Control of Operating Current
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