參數(shù)資料
型號： LTC1569I
廠商： Linear Technology Corporation
英文描述： Linear Phase, DC Accurate, Tunable, 10th Order Lowpass Filter
中文描述： 線性相位，直流準確，可調諧，第10階低通濾波器
文件頁數(shù)： 6/12頁
文件大?。?/td> 217K
代理商： LTC1569I
6
LTC1569-6
Table1. f
CUTOFF
vs R
EXT
, V
S
= 3V, T
A
= 25
°
C, Divide-by-1 Mode
R
EXT
Typical f
CUTOFF
3844
*
N/A
5010
*
N/A
10k
64kHz
20.18k
32kHz
40.2k
16kHz
Typical Variation of f
CUTOFF
±
3.0%
±
2.5%
±
1%
±
2.0%
±
3.5%
*REXT values less than 10k can be used only in the divide-by-16 mode.
In the divide-by-4 and divide-by-16 modes, the cutoff
frequencies in Table 1 will be lowered by 4 and 16
respectively. When the LTC1569-6 is in the divide-by-4
APPLICATIO
S I
FOR
ATIO
U
W
U
U
and divide-by-16 modes the power is automatically re-
duced. This results in up to a 40% power savings with a
single 5V supply.
The power reduction in the divide-by-4 and divide-by-16
modes, however, effects the fundamental oscillator fre-
quency. Hence, the effective divide ratio will be slightly
different from 4:1 or 16:1 depending on V
S
, T
A
and R
EXT
.
Typically this error is less than 1% (Figures 4 and 6).
The cutoff frequency is easily estimated from the equation
in Figure 1. Examples 1 and 2 illustrate how to use the
graphs in Figures 2 through 7 to get a more precise
estimate of the cutoff frequency.
Figure 4. Typical Divide Ratio in the
Divide-by-4 Mode, T
A
= 25
°
C
Figure 5. Filter Cutoff vs Temperature,
Divide-by-4 Mode, R
EXT
= 10k
Figure 3. Filter Cutoff vs Temperature,
Divide-by-1 Mode, R
EXT
= 10k
Figure 2. Filter Cutoff vs V
SUPPLY
,
Divide-by-1 Mode, T
A
= 25
°
C
V
SUPPLY
(V)
2
D
1569-6 F04
4.08
4.04
4.00
3.96
4
6
8
10
R
EXT
= 5k
R
EXT
= 10k
R
EXT
= 20k
R
EXT
= 40k
TEMPERATURE (
°
C)
–50
N
1569-6 F05
1.010
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
–25
0
25
50
75
100
V
S
= 3V
V
S
= 5V
V
S
= 10V
V
SUPPLY
(V)
2
N
1569-6 F02
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
4
6
8
10
R
EXT
= 5k
R
EXT
= 10k
R
EXT
= 20k
R
EXT
= 40k
TEMPERATURE (
°
C)
–50
N
1569-6 F03
1.010
1.008
1.006
1.004
1.002
1.000
0.998
0.996
0.994
0.992
0.990
–25
0
25
50
75
100
V
S
= 3V
V
S
= 5V
V
S
= 10V
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