Datasheet > LTC1569-6_1

LTC1569-6_1

更新时间： 2022-12-28 23:38:40

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
12页	192K
描述
Linear Phase, DC Accurate, Low Power, 10th Order Lowpass Filter

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LTC1569-6_1 数据手册

LTC1569-6

W U U

APPLICATIONS INFORMATION

Using the equation in Figure 1, the approximate filter

cutoff frequency is f_CUTOFF= 64kHz • (10k/20k)

• (1/16) = 2kHz.

Using the equation in Figure 1, the approximate filter

cutoff frequency is f_CUTOFF= 64kHz • (10k/10k)

• (1/1) = 64kHz.

For a more precise f_CUTOFFestimate, use Table 1 to get

a value of f_CUTOFFwhen R_EXT= 20k and use the graph

in Figure 6 to find the correct divide ratio when V_S= 3V

and R_EXT= 20k. Based on Table 1 and Figure 6, f_CUTOFF

= 32kHz • (20.18k/20k) • (1/16.02) = 2.01kHz.

For a more precise f_CUTOFFestimate, use Figure 2 to

correct for the supply voltage when V_S= 5V. From

Table 1 and Figure 2, f_CUTOFF= 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 1µF ceramic capacitor be-

tween V⁺(Pin 7) and V^–(Pin 4) , as close as possible to

theICtominimizeinductance. Avoidparasiticcapacitance

on R_Xand avoid routing noisy signals near R_X(Pin 6). Use

From Table 1, the part-to-part variation of f_CUTOFFwill

be ±2%. From the graph in Figure 7, the 0°C to 70°C

drift of f_CUTOFFwill be –0.2% to 0.2%.

Example 2: LTC1569-6, R_EXT= 10k, V_S= 5V, divide-by-1

mode,DIV/CLK(Pin 5)connectedtoV^–(Pin4),T_A=25°C.

1.04

1.010

= 5k

= 3V

= 5V

= 10V

EXT

1.008

1.006

1.004

1.002

1.000

0.998

0.996

0.994

0.992

0.990

1.03

1.02

1.01

1.00

0.99

0.98

0.97

0.96

= 10k

= 20k

= 40k

–50

–25

100

(V)

TEMPERATURE (°C)

SUPPLY

1569-6 F02

1569-6 F03

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

4.08

4.04

4.00

3.96

1.010

= 5k

= 3V

= 5V

= 10V

EXT

1.008

1.006

1.004

1.002

1.000

0.998

0.996

0.994

0.992

0.990

= 10k

= 20k

= 40k

–50

–25

100

(V)

TEMPERATURE (°C)

SUPPLY

1569-6 F04

1569-6 F05

Figure 5. Filter Cutoff vs Temperature,

Divide-by-4 Mode, R_EXT= 10k

Figure 4. Typical Divide Ratio in the

Divide-by-4 Mode, T_A= 25°C

1...4 5 678 9 10...12

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