Datasheet > LTC1069-7

LTC1069-7

更新时间： 2023-12-20 18:46:08

品牌	Logo	应用领域
亚德诺 - ADI		/
页数	文件大小	规格书
10页	163K
描述
线性相位 8 阶低通滤波器

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LTC1069-7 数据手册

LTC1069-7

TYPICAL PERFORMANCE CHARACTERISTICS

Output Voltage Swing

vs Temperature

Supply Current

vs Supply Voltage

vs Clock Frequency

4.2

4.1

= 10Hz

CLK

85°C

25°C

= 5V

4.0

–40°C

= 2.5MHz

CLK

CUTOFF

= 100kHz

= 10k

–4.5

–4.6

–4.7

= 1mA

SOURCE SINK

= 5V

–40

80 100

–20

0.25

1.25

2.25

3.25

4.25

5.25

SUꢀꢀLY VOLTAGE ( V)

TEMꢀERATURE (°C)

CLOCK FREQUENCY (MHz)

1069-7 G18

1069-7 G19

1069-7 G20

PIN FUNCTIONS

AGND (Pin 1): Analog Ground. The quality of the analog

signal ground can affect the ﬁlter performance. For either

single or dual supply operation, an analog ground plane

surrounding the package is recommended. The analog

ground plane should be connected to any digital ground

at a single point. For dual supply operation, ꢀin 1 should

be connected to the analog ground plane.

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

connected to any internal circuitry; they should be tied

to ground.

(Pin 4): Filter Input. The ﬁlter input pin is internally

connected to the inverting inputs of two op amps through

a 36k resistor for each op amp. This parallel combination

creates an 18k input impedance.

For single supply operation, ꢀin 1 should be bypassed

to the analog ground plane with a capacitor 0.47μF or

larger. An internal resistive divider biases ꢀin 1 to half the

total power supply. ꢀin 1 should be buffered if used to

bias other ICs. Figure 1 shows the connections for single

supply operation.

ANALOG GROUND

ꢀLANE

AGND

OUT

0.47μF

–

LTC1069-7

0.1μF

CLK

–

V , V (Pins 2, 7): ꢀower Supplies. The V (ꢀin 2) and

V (ꢀin 7) should be bypassed with a 0.1μF capacitor to

DIGITAL

GROUND

ꢀLANE

STAR

SYSTEM

GROUND

an adequate analog ground. The ﬁlter’s power supplies

shouldbeisolatedfromotherdigitalorhighvoltageanalog

supplies.Alownoiselinearsupplyisrecommended.Using

switching power supplies will lower the signal-to-noise

ratio of the ﬁlter. Unlike previous monolithic ﬁlters, the

power supplies can be applied in any order, that is, the

positive supply can be applied before the negative supply

and vice versa. Figure 2 shows the connections for dual

supply operation.

CLOCK

SOURCE

1069-7 F01

Figure 1. Connections for Single Supply Operation

10697fa

1...3 4 567 8 9 10

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