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 828 BP 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 (D0 thru D7 = 0);
Minimum frequency step (Resolution) = f
max
/256
OUT +Vs -Vs
D
7
D
6
D
5
D
4
2.00
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
Bit
Bit
Bit
Bit
Bit
Bit
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
---
2
1
LSB
2
0
Bit
Weight
Corner
Frequency
fc
D
7
0
0
0
0
0
0
0
0
1
D
6
0
0
0
0
0
0
0
1
1
D
5
0
0
0
0
0
0
1
1
1
D
4
0
0
0
0
0
1
1
1
1
D
3
0
0
0
0
1
1
1
1
1
D
2
0
0
0
1
1
1
1
1
1
D
1
0
0
1
1
1
1
1
1
1
D
0
0
1
1
1
1
1
1
1
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
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
11
Ω
typ.
10
Ω
max.
±
10V
±
2 mA
22
mV typ.
20 mV max.
50
µV/°C
0.6 0.5
G-2
G-3
0.15 min.
0.025 Dia.
Side View
All dimensions are in inches
All Case Dimensions ± 0.02"
Grid Dimensions 0.1" x 0.1"
OUT +Vs -Vs
D
7
D
6
D
5
D
4
2.00
GND
D
3
D
2
D
1
D
0
IN Os
4
±
15 Vdc
±
12 to
±
18 Vdc
±
18 Vdc
±
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.
828BP4/10-4
“Q”
BP
- 1, 2, 5, 10
BR
- 3, 10
Model
Model
Number
2
3
4
20 k
Ω
(Cermet)
OS
- Vs
Tuning
Range (Hz)
1.0 to 256
10 to 2560
100 to 25.6k
Minimum
Step(Hz)
1.0
10
100
Case
G-2
G-3
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
Band-Pass
4-Pole Pair
Appendix A
Amplitude Response Curves
0
-10
-20
-30
0
Q1
-1
Q1
Q2
Amp (dB)
Amp (dB)
-40
-50
-60
-70
-80
-90
-100
0.1
2
3
4
5
6
7 8
Q2
-2
Q5
-3
Q5
-4
Q10
Q10
-5
1.0
2
3
4
5
6
7 8
0.6
0.7
0.8
0.9
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 Amplitude Data
Q=1
Amp
(dB)
-0.10
-0.25
-0.50
-1.00
-1.50
-2.00
-2.50
-3.00
-5.00
-10.00
-15.00
-20.00
-25.00
-30.00
-35.00
-40.00
-45.00
-50.00
-55.00
-60.00
-65.00
-70.00
-75.00
-80.00
f
L
< f
O
< f
H
f/f
o
0.735
0.709
0.687
0.663
0.648
0.636
0.627
0.618
0.591
0.539
0.493
0.449
0.407
0.365
0.326
0.290
0.256
0.225
0.197
0.173
0.151
0.131
0.114
0.099
f/f
o
1.360
1.411
1.456
1.508
1.543
1.571
1.596
1.618
1.692
1.855
2.027
2.225
2.459
2.737
3.065
3.452
3.908
4.442
5.067
5.796
6.644
7.630
8.774
10.01
Q=2
f
L
< f
O
< f
H
f/f
o
0.856
0.840
0.826
0.811
0.801
0.793
0.787
0.781
0.762
0.724
0.688
0.650
0.611
0.570
0.527
0.484
0.441
0.399
0.358
0.319
0.283
0.250
0.220
0.193
f/f
o
1.168
1.191
1.211
1.233
1.249
1.261
1.271
1.281
1.313
1.382
1.454
1.538
1.637
1.755
1.896
2.065
2.267
2.507
2.793
3.131
3.530
4.000
4.550
5.193
Q=5
f
L
< f
O
< f
H
f/f
o
0.939
0.932
0.926
0.919
0.914
0.911
0.908
0.905
0.896
0.877
0.858
0.838
0.816
0.791
0.763
0.733
0.699
0.664
0.625
0.585
0.543
0.500
0.457
0.414
f/f
o
1.064
1.073
1.080
1.088
1.094
1.098
1.102
1.105
1.116
1.140
1.165
1.193
1.226
1.265
1.311
1.365
1.430
1.507
1.599
1.710
1.842
2.000
2.189
2.414
Q = 10
f
L
< f
O
< f
H
f/f
o
0.969
0.965
0.962
0.959
0.956
0.954
0.953
0.951
0.946
0.936
0.926
0.915
0.903
0.888
0.872
0.854
0.834
0.811
0.786
0.758
0.727
0.693
0.657
0.618
f/f
o
1.032
1.036
1.039
1.043
1.046
1.048
1.050
1.051
1.057
1.068
1.080
1.093
1.108
1.126
1.146
1.171
1.199
1.233
1.273
1.320
1.376
1.443
1.523
1.618
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
·
Fax on Demand: 978/521-5178
41
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