828BP4/10-4 datasheet, PDF - EEWORLD Datasheet

828BP & 828BR Series

Band Pass and Band Reject

Description:

The 828BP and 828BR Series are 4-pole-pair

digitally programmable band-pass and band-reject

(notch) active filters. These new filters take

advantage of the company’s proprietary designs

using surface-mount technology to provide a low

profile, compact package in minimal board space.

828BP and 828BR filters are factory tuned to one of

three factory set tuning ranges or 8-bit custom

ranges from 1 Hz to 25.6 kHz. Each filter type

features a near theoretical amplitude/phase

response along with low output voltage noise

enabling these filters to achieve a 10,000:1 or better

dynamic signal range

Pretuned to within ±2% of the center frequency,

band-pass 828BP filters pass all frequencies lying

between the upper and lower -3 dB points of the

amplitude response curve, while 828BR band-reject

(notch) filters sharply attenuate those frequencies

that are bound and defined by the bottom of the

notch. Available Q’s for 828BP models are 1, 2, 5, or

10 and 828BR filters are 3 or 10.

Features/Benefits:

• Compact 2.0"L x 2.0"W footprint minimizes board

space requirements.

• Plug-in ready-to-use, reducing engineering design

and manufacturing cycle time.

• Factory tuned, no external clocks or adjustments

needed.

• Broad range of center frequencies to meet a wide

range of applications.

Applications

• Power line interference rejection

• Transducer output filtering

• Production test instrumentation

• Medical electronics equipment and research

• Comb filtering and equalization

• Noise and harmonic analysis

• RMS measurements

• Frequency spectrum analysis

1

8 Bit Programmable

4-Pole Pair Filters

Programmable Specifications:

. . . . . . . . . . . .Page

Digital Tuning & Control . . . . . . . . . . . . . . . . . . . . .2

Available Band-Pass Models:

828BP4

4 pole pair . . . . . . . . . . . . . . . . . . .3

Available Band-Reject Models:

828BR4

4-pole pair . . . . . . . . . . . . . . . . . . .3

General Specifications:

Ordering Information . . . . . . . . . . . . . . . . . . . . . . .4

Pin-Out/package data . . . . . . . . . . . . . . . . . . . . . .4

25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839

e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com

828BP & 828BR Series

8-Bit Programmable Filters

Digital Tuning Characteristics

The digital tuning interface circuits are a parallel set of eight

(8) 4053 CMOS switches which accept CMOS compatible

inputs for the eight tuning bits (D

0

- D

7

).

Filter tuning follows the tuning equation given below:

f

c

= ( f

max

/256 ) [ 1 + D

7

x 2 + D

6

x 2 + D

5

x 2 + D

4

x 2 +

D

3

x 2 + D

2

x 2 + D

1

x 2 + D

0

x 2 ]

where D

1

- D

7

= "0" or "1", and

f

max

= Maximum tuning frequency;

f

c

= corner frequency;

Minimum tunable frequency = f

max

/256 (D

0

thru D

7

= 0);

Minimum frequency step (Resolution) = f

max

/256

2.00

OUT +Vs -Vs

D

7

D

6

D

5

D

4

GND

D

3

D

2

D

1

3

2

1

0

7

6

5

4

Digital Tuning &

Control Characteristics

Pin-Out Key

IN

OUT

GND

+Vs

-Vs

Os

Analog Input Signal

Analog Output Signal

Power and Signal Return

Supply Voltage, Positive

Supply Voltage, Negative

Offset Adjustment

D

7

Tuning

D

6

Tuning

D

5

Tuning

D

4

Tuning

D

3

Tuning

D

2

Tuning

D

1

Tuning

D

0

Tuning

Bit

7 (MSB)

6

5

4

3

2

1

0 (LSB)

Data Input Specifications

Input Data Levels

(CMOS Logic)

4 Vdc max.

15 Vdc max.

Input Voltage (Vs = 15 Vdc)

Low Level In

0 Vdc min.

High Level In

11 Vdc min.

Input Current

High Level In

Low Level In

Input Capacitance

Input Data Format

Positive Logic

Bit Weighting

D

0

D

7

Frequency Range

- 10

µA

typ.

-5

+10

µA

typ

.

5 pF typ

-5

D

0

IN Os

4

-1

µA

max.

.

+1

µA

max.

7.5 pF max.

MSB

2

7

Bottom View

Frequency Select Bits

Logic "1" = +Vs

Logic "0" = Gnd

(Binary-Coded)

LSB (least significant bit)

MSB (most significant bit)

256 : 1, Binary Weighted

---

2

6

---

2

5

---

2

4

---

2

3

---

2

---

2

1

LSB

2

0

Bit

Weight

Corner

Frequency

fc

D

7

0

1

D

6

0

1

D

5

0

1

D

4

0

1

D

3

0

1

D

2

0

1

D

1

0

1

D

0

1

f

max

/256

f

max

/128

f

max

/64

f

max

/32

f

max

/16

f

max

/8

f

max

/4

f

max

/2

fmax

2

25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839

e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com

828BP & 828BR Series

Band-Pass & Band-Reject

Model

Product Specifications

Size

Range fo

Available "Q’s"

1

Q Accuracy

Theoretical Transfer

Characteristics

828BP4

Band-Pass

2.0" x 2.0" x 0.5"

1 Hz to 25.6 kHz

1, 2, 5, 10

±10%

Appendix A

Pages 41 & 42

8-Bit Programmable

4-Pole Pair Filters

Model

Product Specifications

Size

Range fo

Available "Q’s"

1

Q Accuracy

Theoretical Transfer

Characteristics

Notch Attenuation

828BR4

Band-Reject

2.0" x 2.0" x 0.5"

1 Hz to 25.6 kHz

3, 10

±10%

Appendix A

Pages 43

45 db typ.

0± 0.25 dB typ.

0± 0.50 dB max.

24 dB/octave

fo

±0.01%/°C

FMA-02A

±2% max.

Pass-Band Gain

(non-inverting)

0± 0.25 dB typ.

0± 0.50 dB max.

24 dB/octave

fo

±0.01%/°C

FMA-02A

±2% max.

Pass-Band Gain

(non-inverting)

Attenuation Rate

Center Frequency

Stability

Filter Mounting

Assembly

Attenuation Rate

Center Frequency

Stability

Filter Mounting

Assembly

f

O

=

1. Q – Quality Factor for band-pass and band-reject filters. Q = f

O

/(f

H

-f

L

)

√

f

H

f

L

3

25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839

e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com

828BP & 828BR Series

Specification

(25°C and Vs ±15Vdc)

Analog Input Characteristics

1

Impedance

Voltage Range

Max. Safe Voltage

Analog Output Characteristics

Impedance (Closed Loop)

Linear Operating Range

2

Maximum Current

3

Offset Voltage

Offset Temp. Coeff.

Power Supply (

±

V)

Rated Voltage

Operating Range

Maximum Safe Voltage

Quiescent Current

Temperature

Operating

Storage

Notes:

1. Input and output signal voltage referenced to supply common.

2. Output is short circuit protected to common.

DO NOT CONNECT TO ±Vs.

3. Adjustable to zero.

4. Units operate with or without offset pin connected.

Pin-Out and Package Data

Ordering Information

Pin-Out & Package Data

2.00

10 k

Ω

min.

±

10 Vpeak

±

Vs

0.5

G-3

0.15 min.

0.025 Dia.

11

Ω

typ.

10

Ω

max.

±

10V

±

2 mA

22

mV typ.

20 mV max.

50

µV/°C

Side View

All dimensions are in inches

All Case Dimensions ± 0.02"

OUT +Vs -Vs

Grid Dimensions 0.1" x 0.1"

±

15 Vdc

±

12 to

±

18 Vdc

±

18 Vdc

2.00

D

7

D

6

D

5

D

4

GND

D

3

D

2

D

1

D

0

IN Os

4

±

25 mA typ.

±

40 mA max.

-20

to +70°C

-25 to +85°C

Bottom View

Filter Mounting Assembly-See FMA-02A

Ordering Information

Filter Type

BP

- Band Pass

BR

- Band Reject

DC Offset Adjustment

± Vs

Do not connect

if trim is not

required.

20 k

Ω

(Cermet)

OS

828BP4/10-4

“Q”

BP

- 1, 2, 5, 10

BR

- 3, 10

Model

Number

2

3

4

- Vs

Tuning

Range (Hz)

1.0 to 256

10 to 2560

100 to 25.6k

Minimum

Step(Hz)

1.0

10

100

Case

G-3

We hope the information given here will be helpful. The information is based on data and our best knowledge, and we consider the information to be true and accurate. Please read all statements,

recommendations or suggestions herein in conjunction with our conditions of sale which apply to all goods supplied by us. We assume no responsibility for the use of these statements,

recommendations or suggestions, nor do we intend them as a recommendation for any use which would infringe any patent or copyright.

PR-828BP/BR-03

4

25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839

e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com

Product Handling

Procedure

Programmable Filter Modules Power Sequence & ESD

November 2000

Programmable Filters Modules

818, 824, 828, 828BP, 828BR, 854, 858, R854, R858

I. Scope

The following precautions are necessary when handling and installing Frequency Devices

programmable filter modules.

II. Digital Circuit Description

The digital input pins connect directly to 4000 series CMOS logic, such as the 4053 analog switch. The

power supply (Vss) for the digital logic on the module comes directly from the +15 Volt pin on the

module. This sets the threshold voltage at 11.0 V minimum to 15.0 V maximum for a "1" (High) level

and 0.0 V minimum to 4.0 V maximum for a "0" (Low) level. Applying a voltage between 4.0 and 11.0

V will produce unpredictable operation. Connecting 5 Volt or 3.3 V logic devices directly to the filter

module without using a voltage translator will result in erratic operation of the filter.

III. (VERY IMPORTANT) Power-Up and Power-Down Sequence

Do not plug-in or un-plug module while power is applied.

It is imperative that power is

supplied to the + 15 V pin on the filter module before or at the same instance that any digital pin is

pulled High (> 0.0 V). Failure to do this will result in excessive current flowing through the digital input

pin and through a protection diode internal to the 4000 logic, which will result in damage to the module.

The proper power-up and power-down sequence is:

1. Connect filter module ground.

2. Connect filter module +15 V.

3. Connect filter module -15 V.

4. Connect the input signal.

All four of the above steps can also occur simultaneously. Power-down should occur in the reverse

order.

IV. ESD Issues

Like most modern electronic equipment, the modules can be damaged by electrostatic discharge (ESD).

The modules are shipped from the factory in sealed, anti-static packaging and should be kept in the

sealed package prior to mounting on a circuit board. The following additional rules should also be

observed when handling the modules after they are removed from the factory packaging:

1. Only a person wearing a properly grounded wrist strap should handle the modules.

2. Any work surface that the modules are placed on must be properly ESD grounded.

3. Any insulating materials capable of generating static charge (such as paper) should be kept

away from the modules.

Static generating clothing should be covered with an ESD-protective smock.

1

25 Locust St, Haverhill, Massachusetts 01830 • Tel: 800/252-7074, 978/374-0761 • FAX: 978/521-1839

e-mail: sales@freqdev.com • Web Address: http://www.freqdev.com

828BP4/10-4

828BP4/10-4 Overview

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