ECRI Microelectronics

HLP1000 Low-Pass Filter

Features:
Passband frequency: 1000Hz

Gain: 20dB
Out-band attenuation: ≥30dB
Four-stage Chebyshev function type
Volume is 25×20×5.5mm3, hybrid integrated metal airtight package case
Quality class: commercial, industrial, military and aerospace class
Operating temperature range: 0~70℃, -40~85℃, -55~85℃, -55~125℃


1.Keywords of HLP1000 Low-Pass Filter:

Band-stop, filter, active, thin film, military

2.Description of HLP1000 Low-Pass Filter:

HLP1000 is a kind of active low-pass signal filter designed for low-frequency signal frequencies with 0dB gain of passband signal and attenuation of other out-band signals, the module has the features of good frequency selection feature, good in-band flatness, good consistency between modules etc. The module adopts thin film hybrid integration technology, high precision thin film resistor network and precision capacitor make the electric circuit still have stable and ideal amplitude-frequency characteristic and temperature characteristic even if it is designed to be in high order filtration topological structure. The electric circuit is equipped with ESD design to prevent peak interference.
The module can be applied to signal frequency selection and filtration of the system, gain, central frequency and mathematical model for filtration can be adjusted and customized according to the requirements of the user.

3.Application of HLP1000 Low-Pass Filter:

Platform inertial navigation system
Infrared sensor system

4.Principle of type selection of HLP1000 Low-Pass Filter

For active filter, it is not necessary to consider the index of differential loss of passive filter. First, determine the central frequency, then, determine the gain according to the need of electric circuit. The nearer the out-band interference frequency point is to the central frequency, the greater the number of stages (orders) designed for filter, the more complicated the electric circuit, and the poorer the amplitude-frequency characteristic and temperature characteristic. Therefore, the out-band attenuation shall be determined according to actual need, don’t pursue high attenuation too much. The flatness index is also associated with the complexity of electric circuit, and this index can be relaxed accordingly if there are not special requirements.
The insertion of filter will make phase shift of signal, the more distant the filter is from the central frequency, the greater the phase shift will be.
We will determine the mathematical model of filter and select Butterworth, Chebyshev, elliptic or Bethel filter topological structure, and we can design and manufacture precision active filter with the number of stages up to 8 so as to meet the requirements of the user.

5.Pin designation of HLP1000 Low-Pass Filter

The module is of DIL construction.

Pin

Symbol

Meaning

Pin

Symbol

Meaning

1

Case

Case ground

9

GND

Ground

2

Vin

Signal input

10

GND

Ground

3

GND

Ground

11

Nc

Vacant

4

Nc

Vacant

12

Vout

Output

5

Nc

Vacant

13

GND

Ground

6

Nc

Vacant

14

Vee

-15V

7

Nc

Vacant

15

Vcc

+15V

8

Nc

Vacant

16

Nc

Vacant


6.Electric performance of circuit of HLP1000 Low-Pass Filter


Table 1  Electric characteristics

Characteristics

Symbol

Condition

(Unless otherwise specified,

VCC=15±0.1V

VEE=-15±0.1V

-55℃≤TA≤125℃)

Limit value

Unit

Min.

Max.

Passband frequency

f0


-

1000

Hz

Gain

GV


19

21

dB

Out-band attenuation

ASB


30

-

dB


7.Characteristic curve of HLP1000 Low-Pass Filter

hlp1000-low-pass-filter
Amplitude-frequency characteristic

hlp1000-low-pass-filter
Phase-frequency characteristic

8.Application block diagram of HLP1000 Low-Pass Filter


hlp1000-low-pass-filter

9.External dimensions of HLP1000 Low-Pass Filter


hlp1000-low-pass-filter
unit: mm

Symbol

Value

Min.

Nominal

Max.

A

-

5

6

фb

0.5

-

0.7

D

-

25

26

E

-

20

21

e

2.24

2.54

2.84

e1

14.74

15.24

15.74

L

5

-

-

10.Outside view
The type of package and performance indexes of the circuit can be adjusted and customized according to customer’s demand.

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