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

BLOCK DIAGRA

OUT

10TH ORDER

LINEAR PHASE

FILTER NETWORK

–

EXT

POWER

CONTROL

GND

DIVIDER/

BUFFER

–

DIV/CLK

PRECISION

OSCILLATOR

1569-6 BD

W U U

APPLICATIONS INFORMATION

Table1. f_CUTOFFvs R_EXT, V_S= 3V, T_A= 25°C, Divide-by-1 Mode

Self-Clocking Operation

Typical f

Typical Variation of f

±3.0%

EXT

CUTOFF

The LTC1569-6 features a unique internal oscillator which

sets the filter cutoff frequency using a single external

resistor. The design is optimized for V_S= 3V, f_CUTOFF

3844Ω*

5010Ω*

10k

N/A

±2.5%

64kHz

32kHz

16kHz

±1%

64kHz, where the filter cutoff frequency error is typically

<1% when a 0.1% external 10k resistor is used. With

different resistor values and internal divider settings, the

cutoff frequency can be accurately varied from 1kHz to

64kHz. As shown in Figure 1, the divider is controlled by

the DIV/CLK (Pin 5). Table 1 summarizes the cutoff

frequency vs external resistor values for the divide-by-1

mode.

20.18k

40.2k

±2.0%

±3.5%

*R values less than 10k can be used only in the divide-by-16 mode.

EXT

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

and divide-by-16 modes the power is automatically re-

duced. This results in up to a 40% power savings.

OUT

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_Aand R_EXT

Typically this error is less than 1% (Figures 4 and 6).

–

LTC1569-6

GND

EXT

DIVIDE-BY-16

DIVIDE-BY-4

100pF

–

DIV/CLK

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.

64kHz (10k/R

)

EXT

CUTOFF

DIVIDE-BY-1

1, 4 OR 16

1569-6 F01

Figure 1

Example 1: LTC1569-6, R_EXT= 20k, V_S= 3V, divide-by-16

mode,DIV/CLK(Pin 5)connectedtoV⁺(Pin7),T_A=25°C.

1...3 4 567 8 9...12

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