Datasheet > LTC1069-1

LTC1069-1

更新时间： 2023-12-20 18:45:14

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
10页	141K
描述
低功率、8 阶渐进式椭圆、低通滤波器

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LTC1069-1 数据手册

LTC1069-1

APPLICATIONS INFORMATION

Temperature Behavior

Any parasitic switching transients during the rise and

fall edges of the incoming clock are not part of the clock

feedthrough speciﬁcations. Switching transients have

frequency contents much higher than the applied clock;

their amplitude strongly depends on scope probing tech-

niques as well as grounding and power supply bypassing.

The clock feedthrough can be reduced, if bothersome, by

adding a single RC lowpass ﬁlter at the output pin (8) of

the LTC1069-1.

The power supply current of the LTC1069-1 has a positive

temperature coefﬁcient. The GBW product of its internal

op amps is nearly constant and the speed of the device

doesnotdegradeathightemperatures. Figures3a, 3band

3c show the behavior of the maximum passband of the

device for various supplies and temperatures. The ﬁlter,

especially at 5V supply, has a passband behavior which

is nearly temperature independent.

Wideband Noise

Clock Feedthrough

The wideband noise of the ﬁlter is the total RMS value

of the device’s noise spectral density and determines the

operating signal-to-noise ratio. Most of the wideband

noise frequency contents lie within the ﬁlter passband.

The wideband noise cannot be reduced by adding post

ﬁltering. The total wideband noise is nearly independent

of the clock frequency and depends slightly on the power

supply voltage (see Table 3). The clock feedthrough speci

ﬁcations are not part of the wideband noise.

The clock feedthrough is deﬁned as the RMS value of the

clock frequency and its harmonics that are present at the

ﬁlter’s output pin (8). The clock feedthrough is tested with

the input pin (4) shorted to the AGND pin and depends on

PC board layout and on the value of the power supplies.

With proper layout techniques the values of the clock

feedthrough are shown on Table 2.

Table 2. Clock Feedthrough

CLOCK FEEDTHROUGH

Table 3. Wideband Noise

3.3V

10μV

40μV

RMS

WIDEBAND NOISE

3.3V

100μV

108μV

112μV

RMS

160μVRMS

2.0

1.5

2.0

1.5

2.0

1.5

CLK

= 3.3V

CLK

= 5V

V =

= 1.5MHz

= 750kHz

= 1MHz

CLK

= 0.5V

= 1.2V

V = 2V

IN RMS

RMS

= 25°C

1.0

= 85°C

= 25°C

= 85°C

0.5

= –40°C

T = 25°C

= –40°C

–0.5

–1.0

–1.5

–2.0

–0.5

–1.0

–1.5

–2.0

–0.5

–1.0

–1.5

–2.0

= –40°C

1.5

2.5 3.5 4.5 5.5

FREQUENCY (kHz)

7.5

1.5 2.5 3.5 4.5 5.5

7.5 8.5 9.5 10.5

0.5

6.5

0.5

6.5

FREQUENCY (kHz)

10691 F03a

10691 F03b

10691 F03c

Figure 3a

Figure 3b

Figure 3c

10691fa

1...4 5 678 9 10

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与LTC1069-1相关器件

型号	品牌	描述	获取价格	数据表
LTC1069-1C	Linear	Low Power, 8th Order Progressive Elliptic, Lowpass Filter	获取价格
LTC1069-1CN8	Linear	Low Power, 8th Order Progressive Elliptic, Lowpass Filter	获取价格
LTC1069-1CN8#PBF	Linear	LTC1069-1 - Low Power, 8th Order Progressive Elliptic, Lowpass Filter; Package: PDIP; Pins	获取价格
LTC1069-1CS8	Linear	Low Power, 8th Order Progressive Elliptic, Lowpass Filter	获取价格
LTC1069-1CS8#PBF	Linear	LTC1069-1 - Low Power, 8th Order Progressive Elliptic, Lowpass Filter; Package: SO; Pins:	获取价格
LTC1069-1CS8#TR	Linear	LTC1069-1 - Low Power, 8th Order Progressive Elliptic, Lowpass Filter; Package: SO; Pins:	获取价格

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