Datasheet > LTC1069-6

LTC1069-6

更新时间： 2022-11-25 12:22:29

品牌	Logo	应用领域
凌特 - Linear		/
页数	文件大小	规格书
8页	230K
描述
Single Supply, Very Low Power, Elliptic Lowpass Filter

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LTC1069-6 数据手册

LTC1069-6

PIN FUNCTIONS

only. Table 1 shows the clock’s low and high level thresh-

old value for a dual or single supply operation. A pulse

generator can be used as a clock source provided the high

level ON time is greater than 0.42µs (V_S= ±5V). Sine

waves less than 100kHz are not recommended for clock

frequencies because, excessive slow clock rise or fall

times generate internal clock jitter. The maximum clock

rise or fall time is 1µs. The clock signal should be routed

from the right side of the IC package to avoid coupling into

any input or output analog signal path. A 1k resistor

between the clock source and the Clock Input (Pin 5) will

slow down the rise and fall times of the clock to further

reduce charge coupling (Figure 1).

AGND

OUT

–

0.1µF

LTC1069-6

CLK

ANALOG GROUND PLANE

STAR

DIGITAL

GROUND

SYSTEM

GROUND

PLANE

CLOCK

SOURCE

1069-6 F03

Figure 3. Connections for Dual Supply Operation

Table 1. Clock Source High and Low Thresholds

NC (Pins 3, 6): No Connection. Pins 3 and 6 are not

connected to any internal circuitry; they should be tied to

ground.

POWER SUPPLY

HIGH LEVEL

1.5V

LOW LEVEL

0.5V

Dual Supply = ±5V

Single Supply = 10V

Single Supply = 5V

Single Supply = 3.3V

6.5V

5.5V

V_IN(Pin4):FilterInputPin. TheFilterInputpinisinternally

connected to the inverting input of an op amp through a

50k resistor.

1.5V

0.5V

1.2V

0.5V

CLK (Pin 5): Clock Input Pin. Any TTL or CMOS clock

source with a square wave output and 50% duty cycle

(±10%) is an adequate clock source for the device. The

power supply for the clock source should not necessarily

be the filter’s power supply. The analog ground of the filter

shouldbeconnectedtotheclock’sgroundatasinglepoint

V_OUT(Pin 8): Filter Output Pin. Pin 8 is the output of the

filter, and it can source 8mA or sink 1mA. The total

harmonic distortion of the filter will degrade when driving

coaxial cables or loads less than 20k without an output

buffer.

W U U

APPLICATIONS INFORMATION

Temperature Behavior

= SINGLE 3V

= 0.5V

RMS

The power supply current of the LTC1069-6 has a positive

temperature coefficient. The GBW product of its internal

op amps is nearly constant and the speed of the device

doesnotdegradeathightemperatures. Figures4a, 4band

4c show the behavior of the passband of the device for

various supplies and temperatures. The filter has a pass-

band behavior which is temperature independent.

85°C

–40°C

= 500kHz

CLK

CUTOFF

–1

–2

= 10kHz

11 13 15 17 19 21

FREQUENCY (kHz)

1069-6 F04a

Figure 4a

1...3 4 567 8

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