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
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
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.
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.
Band Pass
824BP Series
8 Bit Programmable
2-Pole Pair Filters
1
Programmable Specifications:
. . . . . . . . . . . .
Page
Digital Tuning & Control . . . . . . . . . . . . . . . . . . . . .2
Available Band-Pass Models:
824BP2
2 pole pair . . . . . . . . . . . . . . . . . . .3
General Specifications:
Ordering Information . . . . . . . . . . . . . . . . . . . . . . .4
Pin-Out/package data . . . . . . . . . . . . . . . . . . . . . .4
824BP Series
Digital Tuning &
Control Characteristics
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
8-Bit Programmable Filters
2
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
7
+ D
6
x 2
6
+ D
5
x 2
5
+ D
4
x 2
4
+
D
3
x 2
3
+ D
2
x 2
2
+ D
1
x 2
1
+ D
0
x 2
0
]
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
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
mA typ. -1 mA max.
.
Low Level In
+10
-5
mA typ
.
+1
mA 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 Weighting
(Binary-Coded)
D
0
LSB (least significant bit)
D
7
MSB (most significant bit)
Frequency Range
256 : 1, Binary Weighted
Pin-Out Key
IN
Analog Input Signal
D
7
Tuning Bit 7 (MSB)
OUT Analog Output Signal
D
6
Tuning Bit 6
GND Power and Signal Return
D
5
Tuning Bit 5
+Vs
Supply Voltage, Positive
D
4
Tuning Bit 4
-Vs
Supply Voltage, Negative
D
3
Tuning Bit 3
Os
Offset Adjustment
D
2
Tuning Bit 2
D
1
Tuning Bit 1
D
0
Tuning Bit 0 (LSB)
MSB
---
---
---
---
---
---
LSB
Bit
Weight
2
7
2
6
2
5
2
4
2
3
2
2
2
1
2
0
fc
Corner
Frequency
D
7
D
6
D
5
D
4
D
3
D
2
D
1
D
0
0
0
0
0
0
0
0
0
f
max
/256
0
0
0
0
0
0
0
1
f
max
/128
0
0
0
0
0
0
1
1
f
max
/64
0
0
0
0
0
1
1
1
f
max
/32
0
0
0
0
1
1
1
1
f
max
/16
0
0
0
1
1
1
1
1
f
max
/8
0
0
1
1
1
1
1
1
f
max
/4
0
1
1
1
1
1
1
1
f
max
/2
1
1
1
1
1
1
1
1
fmax
+Vs
OUT
-Vs
D
D
D
D
GND
D
D
D
D
IN
2.00
Bottom View
Os
4
5
3
2
1
0
6
7
4
Band-Pass
824BP Series
8-Bit Programmable
2-Pole Pair Filters
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
3
Model
824BP2
Product Specifications
Band-Pass
Size Model 2
2.0" x 2.0" x 0.5"
Model 3 & 4
2.0" x 2.0" x 0.4"
Range f
o
1 Hz to 25.6 kHz
Available "Q's"
1
1, 2, 5, 10
"Q" Accuracy
10 %
Theoretical Transfer
Appendix A
Characteristics
Pages 39 & 40
Pass-Band Gain
0 0.25 dB typ
(non-inverting)
0 0.50 dB max.
Attenuation Rate
12 dB/octave
Center Frequency
f
o
2% max.
Stability
0.01%/C
Filter Mounting
FMA-02A
Assembly
1. Q Quality Factor for band-pass filters. Q = f
O
/(f
H
-f
L
)
f
O
=
f
H
f
L
824BP Series
Pin-Out and Package Data
Ordering Information
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-824BP-01
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
4
Specification
(25C and Vs 15Vdc)
DC Offset Adjustment
Vs
- Vs
20 k
W
(Cermet)
Do not connect
if trim is not
required.
OS
Analog Input Characteristics
1
Impedance
10 k
W
min.
Voltage Range
10 Vpeak
Max. Safe Voltage
Vs
Analog Output Characteristics
Impedance (Closed Loop)
1
1
W
typ.
10
W
max.
Linear Operating Range
10V
Maximum Current
2
2 mA
Offset Voltage
3
2
2 mV typ.
20 mV max.
Offset Temp. Coeff.
50
mV/C
Power Supply (
V)
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
-2
0 to +70C
Storage
-25 to +85C
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.
824BP2/10-3
Model Tuning
Minimum
Number
Range (Hz)
Step(Hz) Case
2
1.0 to 256
1.0
G-3
3
10 to 2560
10
G-1
4
100 to 25.6k
100
G-1
Model
Ordering Information
Side View
+Vs
OUT
-Vs
D
D
D
D
GND
D
D
D
D
IN
2.00
0.4
2.00
Bottom View
G-1
0.15 min.
0.025 Dia.
Os
4
5
3
2
1
0
6
7
4
G-3
0.5
All dimensions are in inches
All Case Dimensions 0.02"
Grid Dimensions 0.1" x 0.1"
Filter Mounting Assembly-See FMA-02A
Pin-Out & Package Data
"Q"
1, 2, 5, 10
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
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
Product Handling
Procedure
Programmable Filter Modules Power Sequence & ESD
Q = 1
Q = 2
Q = 5
Q = 10
f
L
< f
O
< f
H
f
L
< f
O
< f
H
f
L
< f
O
< f
H
f
L
< f
O
< f
H
Amp
(dB)
f / fO
f / fO
f / fO
f / fO
f / fO
f / fO
f / fO
f / fO
-0.10 0.824 1.214
0.907 1.102
0.962 1.040
0.981 1.020
-0.25 0.783 1.277
0.884 1.131
0.952 1.051
0.976 1.025
-0.50 0.747 1.338
0.863 1.159
0.943 1.061
0.971 1.030
-1.00 0.705 1.418
0.837 1.194
0.931 1.074
0.965 1.036
-1.50 0.677 1.478
0.820 1.220
0.923 1.083
0.961 1.041
-2.00 0.654 1.529
0.805 1.242
0.916 1.091
0.957 1.045
-2.50 0.635 1.574
0.792 1.262
0.910 1.098
0.954 1.048
-3.00 0.618 1.617
0.781 1.280
0.905 1.105
0.951 1.051
-5.00 0.563 1.776
0.742 1.348
0.886 1.129
0.941 1.062
-10.00 0.457 2.189
0.657 1.523
0.842 1.188
0.917 1.090
-15.00 0.368 2.720
0.572 1.748
0.792 1.263
0.889 1.125
-20.00 0.290 3.445
0.485 2.062
0.733 1.364
0.855 1.170
-25.00 0.225 4.439
0.399 2.506
0.664 1.507
0.811 1.233
-30.00 0.173 5.795
0.319 3.130
0.585 1.709
0.758 1.320
-35.00 0.131 7.630
0.250 3.999
0.500 2.000
0.693 1.443
-40.00 0.099 10.09
0.193 5.192
0.414 2.414
0.618 1.618
-45.00 0.075 13.41
0.147 6.814
0.333 3.001
0.535 1.869
-50.00 0.056 17.83
0.111 9.002
0.262 3.819
0.449 2.228
-55.00 0.042 23.75
0.084 11.94
0.202 4.945
0.365 2.737
-60.00 0.032 31.65
0.063 15.87
0.154 6.479
0.290 3.453
-65.00 0.024 42.19
0.047 21.13
0.117 8.552
0.225 4.443
-70.00 0.018 56.25
0.036 28.15
0.088 11.33
0.172 5.798
-75.00 0.013 75.00
0.027 37.52
0.066 15.06
0.131 7.632
-80.00 0.010 100.0
0.020 50.01
0.050 20.05
0.099 10.10
Band-Pass
2-Pole Pair
Appendix A
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
Amplitude Response Curves
0.1
1.0
10.0
2
3 4 5 6 7 8
2
3 4 5 6 7 8
Normalized Frequency (f/fo)
-80
-70
-60
-50
-40
-30
-20
-10
0
Amp (dB)
Normalized Frequency (f/fo)
1.0
0.9
0.8
0.7
0.6
-5
-4
-3
-2
-1
0
Amp (dB)
1.1 1.2
1.4
1.3
1.5 1.6
Q1
Q2
Q5
Q10
Q1
Q2
Q5
Q10
39
Band-Pass
2-Pole Pair
Appendix A
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
Q = 1
Q = 2
Q = 5
Q = 10
(+)
(-)
(+)
(-)
(+)
(-)
(+)
(-)
Phase
Mag
(
deg)
f / fO
f / fO
f / fO
f / fO
f / fO
f / fO
f / fO
f / fO
1.0
0.994 1.006
0.997 1.003
0.999 1.001 0.999 1.001
2.5
0.985 1.016
0.992 1.008
0.997 1.003 0.998 1.002
5.0
0.970 1.031
0.985 1.016
0.994 1.006 0.997 1.003
10.0
0.940 1.063
0.970 1.031
0.988 1.012 0.994 1.006
15.0
0.913 1.096
0.955 1.047
0.982 1.018 0.991 1.009
20.0
0.886 1.128
0.941 1.062
0.976 1.025 0.988 1.012
25.0
0.861 1.161
0.928 1.078
0.970 1.030 0.985 1.015
30.0
0.838 1.194
0.915 1.093
0.965 1.036 0.982 1.018
35.0
0.815 1.227
0.902 1.108
0.960 1.042 0.980 1.021
40.0
0.794 1.259
0.891 1.123
0.955 1.048 0.977 1.024
45.0
0.774 1.292
0.879 1.138
0.950 1.053 0.974 1.026
50.0
0.755 1.324
0.868 1.152
0.945 1.059 0.972 1.029
60.0
0.719 1.391
0.846 1.182
0.935 1.069 0.967 1.034
70.0
0.685 1.460
0.825 1.212
0.925 1.081 0.962 1.040
80.0
0.652 1.535
0.803 1.245
0.916 1.092 0.957 1.045
90.0
0.618 1.618
0.781 1.281
0.905 1.105 0.951 1.051
105.0
0.564 1.772
0.743 1.346
0.887 1.128 0.941 1.062
120.0
0.502 1.991
0.695 1.439
0.862 1.160 0.928 1.077
135.0
0.424 2.356
0.628 1.594
0.825 1.212 0.908 1.101
150.0
0.320 3.126
0.520 1.923
0.758 1.319 0.869 1.150
165.0
0.177 5.639
0.327 3.058
0.593 1.686 0.764 1.310
180.0
0
inf
0
inf
0
inf
0
inf
Phase Response Curves
Normalized Frequency (f/fo)
1.0
0.9
0.8
0.7
0.6
Phase (deg)
1.1 1.2
1.4
1.3
1.5 1.6
0.1
1.0
10.0
2
3 4 5 6 7 8
2
3 4 5 6 7 8
Normalized Frequency (f/fo)
-180
-90
0
90
180
Phase (deg)
Q1
Q2
Q5
Q10
Q1
Q2
Q5
Q10
Normalized Theoretical Phase Data
-180
-90
0
90
180
40
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