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参数资料
| 型号： | LTC1569CS8-7#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
LTC1569-7
APPLICATIONS INFORMATION
WU
U
Figure 5. Filter Cutoff vs Temperature,
Divide-by-4 Mode, REXT = 10k
Figure 7. Filter Cutoff vs Temperature,
Divide-by-16 Mode, REXT = 10k
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.
Example 1: LTC1569-7, REXT = 20k, VS = 3V, divide-by-16
mode, DIV/CLK (Pin 5) connected to V + (Pin 7), TA = 25°C.
Using the equation in Figure 1, the approximate filter
cutoff frequency is fCUTOFF = 128kHz (10k/20k)
(1/16) = 4kHz.
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
= 64kHz (20.18k/20k) (1/16.02) = 4.03kHz.
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: LTC1569-7, REXT = 5k, VS = 5V, divide-by-1
mode, DIV/CLK (Pin 5) connected to V – (Pin 4), TA = 25°C.
Using the equation in Figure 1, the approximate filter
cutoff frequency is fCUTOFF = 128kHz (10k/5k)
(1/1) = 256kHz.
For a more precise fCUTOFF estimate, use Table 1 to get
fCUTOFF frequency for REXT = 5k and use Figure 2 to
correct for the supply voltage when VS = 5V. From
Table 1 and Figure 2, fCUTOFF = 256k (5.01k/5k)
0.970 = 249kHz.
Figure 6. Typical Divide Ratio in the
Divide-by-16 Mode, TA = 25°C
TEMPERATURE (
°C)
–50
NORMALIZED
FILTER
CUTOFF
1569-7 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
DIVIDE
RATIO
1569-7 F06
16.32
16.16
16.00
15.84
4
6
810
REXT = 5k
REXT = 10k
REXT = 20k
REXT = 40k
TEMPERATURE (
°C)
–50
NORMALIZED
FILTER
CUTOFF
1569-7 F07
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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