Filters > 824BP

824BP

1 Hz to 25.6 kHz
2" x 2"
Band-Pass Filters

Specifications

Pin-out and package data

Ordering Information

Ordering Information


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824BP
8-Bit Programmable
2 Pole Pair
Band-Pass Filters
 

 

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Description

The 824BP Series is a 2-pole-pair digitally programmable precision band-pass active filter that provides high performance in a compact 2" x 2" footprint. 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. 824BP 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 824BP filters pass all frequencies lying between the upper and lower -3dB points of the amplitude response curve. Available Q’s for 824BP models are 1, 2, 5, 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

 

Programmable Tuning and Control
Digital Tuning & Control

Available Band-Pass Models
824BP2 2 Pole Pair


8-Bit Programmable Filters

 

824BP Series

Digital Tuning &
Control Characteristics


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 (D0 - D7 ).

Filter tuning follows the tuning equation given below:

fc = ( fmax/256 ) [ 1 + D7 x 27 + D6 x 26 + D5 x 25 + D4 x 24 + D3 x 23 + D2 x 22 + D1 x 21 + D0 x 20]

where D1 - D7 = "0" or "1", and
f
max = Maximum tuning frequency;
f
c = corner frequency;
Minimum tunable frequency = f
max/256 (D0 thru D7 = 0);
Minimum frequency step (Resolution) = f
max/256

MSB
---
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LSB
Bit
Weight
27
D
7
26
D
6
25
D
5
24
D
4
23
D
3
22
D
2
21
D
1
20
D
0
fc
Corner
Frequency
0
0
0
0
0
0
0
0
fmax/256
0
0
0
0
0
0
0
1
fmax/128
0
0
0
0
0
0
1
1
fmax/64
0
0
0
0
0
1
1
1
fmax/32
0
0
0
0
1
1
1
1
fmax/16
0
0
0
1
1
1
1
1
fmax/8
0
0
1
1
1
1
1
1
fmax/4
0
1
1
1
1
1
1
1
fmax/2
1
1
1
1
1
1
1
1
fmax

 

Data Input Specifications

Input Data Levels
 
(CMOS Logic)
Input Voltage (Vs=15 Vdc )
Low Level In   0 Vdc min.   4 Vdc max.
High Level In   11 Vdc min.   15 Vdc max.
Input Current        
High Level In   -10-5 µA typ.   -1 µA max.
Low Level In   +10-5 µA typ.   +1 µA max.
Input Capacitance   5 pF typ   7.5 pF max.

Input Data Format
 
Frequency Select Bits
Positive Logic   Logic "1" = +Vs
    Logic "0" = Gnd
Bit Weight   (Binary-Coded)
  D0   LSB (least significant bit)
  D7   MSB (most significant bit)

Frequency Range 256 : 1, Binary Weighted

 

 

  Pin-Out Key

IN
Analog Input Signal
 
D7
Tuning Bit 7 (MSB)
OUT
Analog Output Signal
 
D6
Tuning Bit 6
GND
Power and Signal Return
 
D5
Tuning Bit 5
+Vs
Supply Voltage, Positive
 
D4
Tuning Bit 4
-Vs
Supply Voltage, Negative
 
D3
Tuning Bit 3
Os
Offset Adjustment
  D2
Tuning Bit 2
      D1
Tuning Bit 1
      D0
Tuning Bit 0 (LSB)

 

 

 


Band-Pass
824BP Series
8-Bit Programmable
2-Pole Pair Filters
Model 824BP2
Product Specifications
 
Band-Pass
Size Model 2
        Model 3 & 4

Range fo

Available "Q’s"1

Q Accuracy

2.0" x 2.0" x 0.5"
2.0" x 2.0" x 0.4"

1 Hz to 25.6 kHz

1, 2, 5, 10

±10%

Theoretical Transfer
Characteristics
Click to view
   
Pass-Band Gain
   
(non-inverting)
0± 0.25 dB typ.
0± 0.50 dB max.
Attenuation Rate 12 dB/octave
Center Frequency fo     ±2% max.
Stability ±0.01%/°C
Filter Mounting
Assembly
FMA-02A

Notes 1: Q – Quality Factor for band-pass filters. Q = fo / (fH - fL)

fo=sq.rt.(fH x fL)


Specifications

(@ 25°C and Vs ±15 Vdc)

Analog Input Characteristics (1)
  • Impedance: 10 kΩ min.
  • Voltage Range: ± 10 Vpeak
  • Max. Safe Voltage: ± Vs

Analog Output Characteristics

  • Impedance(Closed Loop):
    1 Ω typ.
    10 Ω max.
  • Linear Operating Range: ± 10 V
  • Maximum Current(2): ± 2 mA
  • Offset Voltage(3):
    2 mV typ.
    20 mV max.
  • Offset Temp. Coeff.: 50 µV / °C

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.
Power Supply (+/-Vs)
  • Rated Voltage: ± 15 Vdc
  • Operating Range: ± 12 to ± 18 Vdc
  • Maximum Safe Voltage: ± 18 Vdc
  • Quiescent Current:
    ± 13 mA typ., ± 20 mA max.

Temperature

  • Operating: 0 to + 70°C
  • Storage: -25 to+85°C


Pin-Out and Package Data

Filter Mounting Assembly - See FMA-02A


Ordering Information


Power Sequence & ESD
Programmable Filters Modules

818, 824, 828, 828BP, 828BR, 854, 858, R854, R858, 824BP, D824, D828

  1. Scope
    The following precautions are necessary when handling and installing Frequency Devices programmable filter modules.

  2. 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.

  3. (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.

  4. 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.


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.


Frequency Devices, Inc.
Your engineering partner for signal conditioning
  1784 Chessie Lane
Ottawa, IL 61350

Fax: (815) 434-8176
e-mail: sales@freqdev.com

 

Phone: (815) 434-7800
or (800) 252-7074 (U.S. only)

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