828BP & 828BR Series
8 Bit Programmable
Band Pass and Band Reject 4-Pole Pair Filters
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. Programmable Specifications: . . . . . . . . . . . .Page
· Factory tuned, no external clocks or adjustments Digital Tuning & Control . . . . . . . . . . . . . . . . . . . . .2
needed.
· Broad range of center frequencies to meet a wide Available Band-Pass Models:
range of applications. 828BP4 4 pole pair . . . . . . . . . . . . . . . . . . .3
Applications Available Band-Reject Models:
· Power line interference rejection 828BR4 4-pole pair . . . . . . . . . . . . . . . . . . .3
· Transducer output filtering
General Specifications:
· Production test instrumentation Ordering Information . . . . . . . . . . . . . . . . . . . . . . .4
· Medical electronics equipment and research Pin-Out/package data . . . . . . . . . . . . . . . . . . . . . .4
· Comb filtering and equalization
· Noise and harmonic analysis
· RMS measurements
· Frequency spectrum analysis
1
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
828BP & 828BR Series
Digital Tuning &
8-Bit Programmable Filters Control Characteristics
Digital Tuning Characteristics Pin-Out Key
The digital tuning interface circuits are a parallel set of eight IN Analog Input Signal D7 Tuning Bit 7 (MSB)
(8) 4053 CMOS switches which accept CMOS compatible OUT Analog Output Signal D6 Tuning Bit 6
inputs for the eight tuning bits (D0 - D7). GND Power and Signal Return D5 Tuning Bit 5
+Vs Supply Voltage, Positive D4 Tuning Bit 4
Filter tuning follows the tuning equation given below: -Vs Supply Voltage, Negative D3 Tuning Bit 3
7 6 5 4 Os Offset Adjustment D2 Tuning Bit 2
fc = ( fmax/256 ) [ 1 + D7 x 2 + D6 x 2 + D5 x 2 + D4 x 2 +
3 2 1 0 D1 Tuning Bit 1
D3 x 2 + D2 x 2 + D1 x 2 + D0 x 2 ]
D0 Tuning Bit 0 (LSB)
where D1 - D7 = "0" or "1", and OUT +Vs -Vs
fmax = Maximum tuning frequency;
fc = corner frequency; D7
Minimum tunable frequency = fmax/256 (D0 thru D7 = 0); D6
Minimum frequency step (Resolution) = fmax/256 D5
D4
Data Input Specifications 2.00 GND
D3
Input Data Levels (CMOS Logic) D2
Input Voltage (Vs = 15 Vdc) D1
Low Level In 0 Vdc min. 4 Vdc max. D0
High Level In 11 Vdc min. 15 Vdc max.
4
IN Os
Input Current
-5
High Level In - 10 µA typ. -1 µA max.. Bottom View
-5
Low Level In +10 µA typ. +1 µA max.
Input Capacitance 5 pF typ 7.5 pF max.
MSB --- --- --- --- --- --- LSB Bit
Input Data Format Frequency Select Bits Weight
7 6 5 4 3 2 1 0
Positive Logic Logic "1" = +Vs 2 2 2 2 2 2 2 2 fc
Corner
Logic "0" = Gnd Frequency
D7 D6 D5 D4 D3 D2 D1 D0
Bit Weighting (Binary-Coded)
D0 LSB (least significant bit) 0 0 0 0 0 0 0 0 fmax/256
D7 MSB (most significant bit)
Frequency Range 256 : 1, Binary Weighted 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
2
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
828BP & 828BR Series
8-Bit Programmable
Band-Pass & Band-Reject 4-Pole Pair Filters
Model 828BP4 Model 828BR4
Product Specifications Band-Pass Product Specifications Band-Reject
Size 2.0" x 2.0" x 0.5" Size 2.0" x 2.0" x 0.5"
Range fo 1 Hz to 25.6 kHz Range fo 1 Hz to 25.6 kHz
Available "Q's"1 1, 2, 5, 10 Available "Q's"1 3, 10
Q Accuracy ±10% Q Accuracy ±10%
Theoretical Transfer Appendix A Theoretical Transfer Appendix A
Characteristics Pages 41 & 42 Characteristics Pages 43
Notch Attenuation 45 db typ.
Pass-Band Gain 0± 0.25 dB typ. Pass-Band Gain 0± 0.25 dB typ.
(non-inverting) 0± 0.50 dB max. (non-inverting) 0± 0.50 dB max.
Attenuation Rate 24 dB/octave Attenuation Rate 24 dB/octave
Center Frequency fo ±2% max. Center Frequency fo ±2% max.
Stability ±0.01%/°C Stability ±0.01%/°C
Filter Mounting FMA-02A Filter Mounting FMA-02A
Assembly Assembly
1. Q Quality Factor for band-pass and band-reject filters. Q = fO/(fH-fL) fO = fHfL
3
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
828BP & 828BR Series
Specification Pin-Out and Package Data
(25°C and Vs ±15Vdc) Ordering Information
Analog Input Characteristics1 Pin-Out & Package Data
Impedance 10 k min.
2.00
Voltage Range ± 10 Vpeak
Max. Safe Voltage ±Vs G-3
Analog Output Characteristics 0.5
Impedance (Closed Loop) 11 typ.
0.15 min.
10 max.
Linear Operating Range ±10V 0.025 Dia. Side View
2
Maximum Current ±2 mA All dimensions are in inches
3
Offset Voltage 22 mV typ. All Case Dimensions ± 0.02"
20 mV max. Grid Dimensions 0.1" x 0.1"
OUT +Vs -Vs
Offset Temp. Coeff. 50 µV/°C
Power Supply (±V) D7
Rated Voltage ±15 Vdc D6
Operating Range ±12 to ±18 Vdc D5
Maximum Safe Voltage ±18 Vdc D4
2.00 GND
Quiescent Current ±25 mA typ. D3
±40 mA max. D2
Temperature D1
Operating -20 to +70°C D0
Storage -25 to +85°C
4
IN Os
Notes:
Bottom View
1. Input and output signal voltage referenced to supply common.
2. Output is short circuit protected to common. Filter Mounting Assembly-See FMA-02A
DO NOT CONNECT TO ±Vs.
3. Adjustable to zero.
4. Units operate with or without offset pin connected. Ordering Information
Filter Type
DC Offset Adjustment BP - Band Pass
± Vs BR - Band Reject
Do not connect
if trim is not
required.
828BP4/10-4
"Q"
20 k
OS BP - 1, 2, 5, 10
(Cermet) BR - 3, 10
Model
Model Tuning Minimum
Number Range (Hz) Step(Hz) Case
- Vs 2 1.0 to 256 1.0 G-3
3 10 to 2560 10 G-3
4 100 to 25.6k 100 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
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
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
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
Band-Pass
4-Pole Pair
Appendix A
Amplitude Response Curves
0 0
Q1
-10
Q1
-20 -1
-30
Q2 Q2
Amp (dB)
Amp (dB)
-40 -2
Q5
-50
-60 -3
Q5
-70
-80 -4
Q10
-90
Q10
-100 -5
2 3 4 5 6 7 8 2 3 4 5 6 7 8 0.6 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 1.5 1.6
0.1 1.0 10.0
Normalized Frequency (f/fo) Normalized Frequency (f/fo)
Normalized Theoretical Amplitude Data
Q=1 Q=2 Q=5 Q = 10
Amp fL < fO < fH fL < fO < fH fL < fO < fH fL < fO < fH
(dB) f/fo f/fo f/fo f/fo f/fo f/fo f/fo f/fo
-0.10 0.735 1.360 0.856 1.168 0.939 1.064 0.969 1.032
-0.25 0.709 1.411 0.840 1.191 0.932 1.073 0.965 1.036
-0.50 0.687 1.456 0.826 1.211 0.926 1.080 0.962 1.039
-1.00 0.663 1.508 0.811 1.233 0.919 1.088 0.959 1.043
-1.50 0.648 1.543 0.801 1.249 0.914 1.094 0.956 1.046
-2.00 0.636 1.571 0.793 1.261 0.911 1.098 0.954 1.048
-2.50 0.627 1.596 0.787 1.271 0.908 1.102 0.953 1.050
-3.00 0.618 1.618 0.781 1.281 0.905 1.105 0.951 1.051
-5.00 0.591 1.692 0.762 1.313 0.896 1.116 0.946 1.057
-10.00 0.539 1.855 0.724 1.382 0.877 1.140 0.936 1.068
-15.00 0.493 2.027 0.688 1.454 0.858 1.165 0.926 1.080
-20.00 0.449 2.225 0.650 1.538 0.838 1.193 0.915 1.093
-25.00 0.407 2.459 0.611 1.637 0.816 1.226 0.903 1.108
-30.00 0.365 2.737 0.570 1.755 0.791 1.265 0.888 1.126
-35.00 0.326 3.065 0.527 1.896 0.763 1.311 0.872 1.146
-40.00 0.290 3.452 0.484 2.065 0.733 1.365 0.854 1.171
-45.00 0.256 3.908 0.441 2.267 0.699 1.430 0.834 1.199
-50.00 0.225 4.442 0.399 2.507 0.664 1.507 0.811 1.233
-55.00 0.197 5.067 0.358 2.793 0.625 1.599 0.786 1.273
-60.00 0.173 5.796 0.319 3.131 0.585 1.710 0.758 1.320
-65.00 0.151 6.644 0.283 3.530 0.543 1.842 0.727 1.376
-70.00 0.131 7.630 0.250 4.000 0.500 2.000 0.693 1.443
-75.00 0.114 8.774 0.220 4.550 0.457 2.189 0.657 1.523
-80.00 0.099 10.01 0.193 5.193 0.414 2.414 0.618 1.618
41
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel 089-321501-0 · Fax 089-321501-11 · www.compumess.de · www.netzteile.de
Band-Pass
4-Pole Pair
Appendix A
Phase Response Curves
360 360
Q10 270
270
Phase (deg)
Phase (deg)
180 180
90 90
0 0
-90 Q1 -90 Q1
Q2 Q2
-180 -180
Q5 Q5
-270 -270
Q10
-360 -360
0.6 0.7 0.8 0.9
0.1 2 3 4 5 6 78
1.0 2 3 4 5 6 7 8 10.0 1.0 1.1 1.2 1.3 1.4 1.5 1.6
Normalized Frequency (f/fo) Normalized Frequency (f/fo)
Normalized Theoretical Phase Data
Phase Q=1 Q=2 Q=5 Q = 10
Mag (+) (-) (+) (-) (+) (-) (+) (-)
(deg) f /f o f /f o f /f o f /f o f /f o f /f o f /f o f /f o
1.0 0.997 1.003 0.998 1.002 0.999 1.001 1.000 1.000
2.5 0.992 1.008 0.996 1.004 0.998 1.002 0.999 1.001
5.0 0.983 1.017 0.992 1.008 0.997 1.003 0.998 1.002
10.0 0.967 1.034 0.983 1.017 0.993 1.007 0.997 1.003
15.0 0.951 1.051 0.975 1.025 0.990 1.010 0.995 1.005
20.0 0.936 1.069 0.967 1.034 0.987 1.013 0.993 1.007
25.0 0.920 1.087 0.959 1.042 0.984 1.017 0.992 1.008
30.0 0.905 1.105 0.951 1.051 0.980 1.020 0.990 1.010
35.0 0.891 1.123 0.944 1.060 0.977 1.023 0.988 1.012
40.0 0.876 1.141 0.936 1.068 0.974 1.027 0.987 1.013
45.0 0.863 1.159 0.929 1.077 0.971 1.030 0.985 1.015
50.0 0.849 1.178 0.921 1.086 0.968 1.033 0.984 1.017
60.0 0.823 1.215 0.907 1.103 0.962 1.040 0.981 1.020
70.0 0.799 1.252 0.893 1.120 0.956 1.046 0.978 1.023
80.0 0.776 1.288 0.880 1.136 0.950 1.052 0.975 1.026
90.0 0.755 1.324 0.868 1.152 0.945 1.058 0.972 1.029
120.0 0.701 1.426 0.835 1.198 0.930 1.075 0.964 1.037
150.0 0.657 1.521 0.807 1.239 0.917 1.090 0.958 1.044
180.0 0.618 1.618 0.781 1.281 0.905 1.105 0.951 1.051
210.0 0.577 1.734 0.752 1.330 0.891 1.122 0.944 1.060
240.0 0.525 1.904 0.713 1.403 0.872 1.147 0.933 1.071
270.0 0.452 2.210 0.653 1.532 0.840 1.191 0.916 1.092
300.0 0.345 2.899 0.548 1.825 0.777 1.288 0.880 1.136
330.0 0.192 5.211 0.350 2.859 0.617 1.621 0.780 1.282
42
CompuMess Elektronik GmbH · Lise-Meitner-Str.1 · 85716 Unterschleissheim
Tel
089-321501-0 · Fax 089-321501-11 ·
www.compumess.de · www.netzteile.de
Band-Reject
4-Pole Pair
Appendix A
Amplitude Response Curves Phase Response Curves
360
0
Q3 Q10 270
-10
Phase (deg)
180
Amp (dB)
-20 Q3
90
-30
0
Q10
-40 -90
-50 -180
-60 1 -270
-70 -360
.8 .9 1.1 1.2 0.1 2 3 4 5 6 7 8 1.0 2 3 4 5 6 7 810.0
Normalized Frequency (f/fo) Normalized Frequency (f/fo)
Normalized Theoretical Amplitude Data Normalized Theoretical Phase Data
Q=3 Q = 10 Phase Q=3 Q = 10
Amp fL