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参数资料
| 型号： | LTC1569IS8-6#TRPBF |
| 厂商： | Linear Technology |
| 文件页数： | 10/12页 |
| 文件大小： | 0K |
| 描述： | IC FILTER 10TH ORDR LOWPASS8SOIC |
| 标准包装： | 2,500 |
| 滤波器类型： | 线性相位，低通开关电容器 |
| 频率 - 截止或中心： | 300kHz |
| 滤波器数： | 1 |
| 滤波器阶数： | 10th |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SOIC |
| 包装： | 带卷 (TR) |
7
LTC1569-6
Using the equation in Figure 1, the approximate filter
cutoff frequency is fCUTOFF = 64kHz (10k/20k)
(1/16) = 2kHz.
For a more precise fCUTOFF estimate, use Table 1 to get
a value of fCUTOFF when REXT = 20k and use the graph
in Figure 6 to find the correct divide ratio when VS = 3V
and REXT = 20k. Based on Table 1 and Figure 6, fCUTOFF
= 32kHz (20.18k/20k) (1/16.02) = 2.01kHz.
From Table 1, the part-to-part variation of fCUTOFF will
be
±2%. From the graph in Figure 7, the 0°C to 70°C
drift of fCUTOFF will be – 0.2% to 0.2%.
Example 2: LTC1569-6, REXT = 10k, VS = 5V, divide-by-1
mode, DIV/CLK (Pin 5) connected to V – (Pin 4), TA = 25°C.
APPLICATIONS INFORMATION
WU
U
Using the equation in Figure 1, the approximate filter
cutoff frequency is fCUTOFF = 64kHz (10k/10k)
(1/1) = 64kHz.
For a more precise fCUTOFF estimate, use Figure 2 to
correct for the supply voltage when VS = 5V. From
Table 1 and Figure 2, fCUTOFF = 64k (10k/10k) 0.970
= 62.1kHz.
The oscillator is sensitive to transients on the positive
supply. The IC should be soldered to the PC board and the
PCB layout should include a 1
F ceramic capacitor be-
tween V + (Pin 7) and V – (Pin 4) , as close as possible to
the IC to minimize inductance. Avoid parasitic capacitance
on RX and avoid routing noisy signals near RX (Pin 6). Use
Figure 4. Typical Divide Ratio in the
Divide-by-4 Mode, TA = 25°C
Figure 5. Filter Cutoff vs Temperature,
Divide-by-4 Mode, REXT = 10k
Figure 3. Filter Cutoff vs Temperature,
Divide-by-1 Mode, REXT = 10k
Figure 2. Filter Cutoff vs VSUPPLY,
Divide-by-1 Mode, TA = 25°C
VSUPPLY (V)
2
DIVIDE
RATIO
1569-6 F04
4.08
4.04
4.00
3.96
4
6
810
REXT = 5k
REXT = 10k
REXT = 20k
REXT = 40k
TEMPERATURE (
°C)
–50
NORMALIZED
FILTER
CUTOFF
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
VS = 3V
VS = 5V
VS = 10V
VSUPPLY (V)
2
NORMALIZED
FILTER
CUTOFF
1569-6 F02
1.04
1.03
1.02
1.01
1.00
0.99
0.98
0.97
0.96
4
6
810
REXT = 5k
REXT = 10k
REXT = 20k
REXT = 40k
TEMPERATURE (
°C)
–50
NORMALIZED
FILTER
CUTOFF
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
VS = 3V
VS = 5V
VS = 10V
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