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
10 Hz to 102.4 kHz
4-Bit Programmable
424 Series
32-Pin DIP
4-Pole Filters
Description
The 424 Series are 4-pole digitally programmable
low-pass and high-pass 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. 424 filters are factory tuned to one of ten
preset 4-bit binary ranges from 10 Hz to 102.4 kHz.
Contact the factory for custom discrete tuning
ranges, maximum span 1000:1.
All 424 Series models are easy to use fully finished
filters which require no external components or
adjustment. They feature low harmonic distortion,
near theoretical phase and amplitude characteristics
and operate over a dynamic input voltage range
from non-critical 12V to 18V power supplies.
Features/Benefits:
Low harmonic distortion and wide signal-to-noise
ratio to 16-bit resolution.
Compact 1.8"L x 0.8"W x 0.3"H min. (32-pin DIP
footprint) minimizes board space requirements.
Digitally programmable corner frequency allows
selecting cut-off frequencies specific to each
application.
Plug-in ready-to-use, reducing engineering design
and manufacturing cycle time.
Factory tuned, no external clocks or adjustments
needed
Broad range of transfer characteristics and corner
frequencies to meet a wide range of applications.
Applications
Anti-alias filtering
Data acquisition systems
Communication systems and electronics
Medical electronics equipment and research
Aerospace, navigation and sonar applications
Acoustic and vibration analysis and control
Real and compressed time data analysis
Noise elimination
Signal reconstruction
Programmable Specifications
. . . . . . . . . . . . . .
Page
Digital Tuning & Control . . . . . . . . . . . . . . . . . . . . . . 2
Available Low-Pass Models:
. . . . . . . . . . . . . . . . . . .
424L4B
4-pole Butterworth . . . . . . . . . . . . . . . . . . 3
424L4L
4-pole Bessel . . . . . . . . . . . . . . . . . . . . . . 3
424L4Y2 4-pole Cheby (0.2 dB Ripple) . . . . . . . . . . 3
424L4Y5 4-pole Cheby (0.5 dB Ripple) . . . . . . . . . . 3
Available High-Pass Models:
. . . . . . . . . . . . . . . . . .
424H4B
4-pole Butterworth . . . . . . . . . . . . . . . . . . 4
424H4Y2 4-pole Cheby (0.2 dB Ripple) . . . . . . . . . . 4
424H4Y5 4-pole Cheby (0.5 dB Ripple) . . . . . . . . . . 4
General Specifications:
Ordering information . . . . . . . . . . . . . . . . . . . . . . . . . 5
Pin-out/package data. . . . . . . . . . . . . . . . . . . . . . . . . 5
4-Bit Programmable Filters
424 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
Digital Tuning Characteristics
The digital tuning interface circuits are a parallel set of CMOS
switches which accept CMOS compatible inputs for the four
tuning bits (D
0
- D
3
).
Binary Tuning Range
Pin-Out Key
IN
Analog Input Signal
D
3
Tuning Bit 3 (MSB)
OUT Analog Output Signal
D
2
Tuning Bit 2
GND Power and Signal Return D
1
Tuning Bit 1
+Vs
Supply Voltage, Positive
D
0
Tuning Bit 0 (LSB)
-Vs
Supply Voltage, Negative +5V Logic Power
Os
Offset Adjustment
Data Input Specifications
Input Data Levels
(+5Vdc CMOS Logic)
Input Voltage (
Vs=15 Vdc
)
Low Level In
0 Vdc min.
0.5 Vdc max.
High Level In
3.5 Vdc min.
5.0 Vdc max.
Input Current
High Level In
-0.4
mA typ.
-2.0
mA max.
Low Level In
+0.4
mA typ.
+2.0
mA max.
Input Capacitance
20 pF typ.
30 pF max.
Input Data Format
Frequency Select Bits
Positive Logic
Logic "1" = (+5Vdc)
Logic "0" = Gnd
Bit Weight
(Binary-Coded)
D
0
LSB (least significant bit)
D
3
MSB (most significant bit)
Frequency Range16:1 Binary Weighted
MSB
---
---
LSB
Bit
Weight
2
3
2
2
2
1
2
0
fc - corner
D
3
D
2
D
1
D
0
frequency
0
0
0
0
f
max
/16
0
0
0
1
f
max
/8
0
0
1
1
f
max
/4
0
1
1
1
f
max
/2
1
1
1
1
f
max
Binary Tuning Equation:
fc = (f
max
/16) [1+ D
3
x 2
3
+ D
2
x 2
2
+ D
1
x 2
1
+ D
0
x 2
0
]
where D
1
- D
3
= "0" or "1", and
f
max
= Maximum tuning frequency
fc = Corner frequency;
Minimum tunable frequency = f
max
/16 (D
0
thru D
3
= 0);
Minimum frequency step (Resolution) = f
max
/16
Discrete Frequencies
F
D
0
D
1
D
2
D
3
F
B
0
0
0
0
F
1
1
0
0
0
F
2
1
1
0
0
F
3
1
1
1
0
F
4
1
1
1
1
Discrete Tuning Equation:
fc = F
B
+ D
0
[
Df
0
] + D
1
[
Df
1
] + D
2
[
Df
2
] + D
3
[
Df
3
]
Df
0
,
Df
1
,
Df
2
,
Df
3
are the incremental frequency shifts for the data
bits D
0
, D
1
,
D
2
and D
3
. They are selected to realize the five
customer specified programming frequencies F
B
fi F
4
. Other
programming codes produce valid fc's between F
B
and F
4
.
Bottom View
0.70
0.80
0.00
0.10
1.00
1.50
1.30
1.10
0.50
1.80
1.60
0.30
0.00
0.80
0.90
Gnd Os
-Vs +Vs
D0
D2 D3
D1
+5V
Out
In
4
2
424 Series
4-Pole
Low-Pass 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
4-Bit Programmable
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
3
Model
424L4B
424L4L
424L4Y2
424L4Y5
Product Specifications
Transfer Function
4-Pole,
4-Pole,
4-Pole, Chebychev,
4-Pole, Chebychev,
Butterworth
Bessel
0.2 dB Ripple
0.5 dB Ripple
Size
0.8" x 1.8" x 0.3"
0.8" x 1.8" x 0.3"
0.8" x 1.8" x 0.3"
0.8" x 1.8" x 0.3"
Range fc
10.0 Hz to 102.4 kHz
10.0 Hz to 102.4 kHz
10.0 Hz to 102.4 kHz
10.0 Hz to 102.4 kHz
Theoretical Transfer
Appendix A
Appendix A
Appendix A
Appendix A
Characteristics
Page 7
Page 2
Page 12
Page 15
Passband Ripple
0.0 dB
0.0 dB
0.20 dB
0.50 dB
(theoretical)
DC Voltage Gain
0 0.1 dB max.
0 0.1 dB max.
0 0.1 dB max.
0 0.1 dB max.
(non-inverting)
0 0.05 dB typ.
0 0.05 dB typ.
0 0.05 dB typ.
0 0.05 dB typ.
Stopband
Attenuation Rate
24 dB/octave
24 dB/octave
24 dB/octave
24 dB min.
Cutoff Frequency
f
c
2% max.
f
c
2% max.
f
c
2% max.
f
c
2% max.
Stability
0.01% /C
0.01% /C
0.01% /C
0.01% /C
Amplitude
-3 dB
-3 dB
-3 dB
-3 dB
Phase
-180
-121
-231
-245
Filter Attenuation
0.67 dB 0.80 f
c
1.86 dB 0.80 f
c
-0.20 dB 0.80 f
c
-0.43 dB 0.80 f
c
(theoretical)
3.01 dB 1.00 f
c
3.01 dB 1.00 f
c
3.01 dB 1.00 f
c
3.01 dB 1.00 f
c
30.0 dB 2.37 f
c
30.0 dB 3.50 f
c
30.0 dB 1.89 f
c
30.0 dB 1.80 f
c
40.0 dB 3.16 f
c
40.0 dB 4.72 f
c
40.0 dB 2.46 f
c
40.0 dB 2.33 f
c
Phase Match
1
0 - 0.8 f
c
2 max.
0 - f
c
2 max.
0 - 0.8 f
c
2 max.
0 - 0.8 f
c
2 max.
1 typ.
1 typ.
1 typ.
1 typ.
0.8 f
c
- 1.0 f
c
3 max.
0.8 f
c
- 1.0 f
c
3 max.
0.8 f
c
- 1.0 f
c
3 max.
1.5 typ.
1.5 typ.
1.5 typ.
Amplitude Accuracy
0 - 0.8 f
c
0.2 dB max.
0 - f
c
0.2 dB max. 0 - 0.8 f
c
0.2 dB max. 0 - 0.8 f
c
0.2 dB max.
(theoretical)
0.1 dB typ.
0.1 dB typ.
0.1 dB typ.
0.1 dB typ.
0.8 f
c
- 1.0 f
c
0.3 dB max.
0.8 f
c
- 1.0 f
c
0.3 dB max. 0.8 f
c
- 1.0 f
c
0.3 dB max.
0.15 dB typ.
0.15 dB typ.
0.15 dB typ.
Total Harmonic
< - 100 dB typ.
< - 100 dB typ.
< - 88 dB typ.
< - 88 dB typ.
Distortion @ 1 kHz
Wide Band Noise
200
mVrms typ.
200
mVrms typ.
200
mVrms typ.
200
mVrms typ.
(5 Hz - 2 MHz)
Narrow Band Noise
50
mVrms typ.
50
mVrms typ.
50
mVrms typ.
50
mVrms typ.
(5 Hz - 100 kHz)
Filter Mounting
Assembly
FMA-02A
FMA-02A
FMA-02A
FMA-02A
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-Bit Programmable
424 Series
4-Pole
High-Pass Filters
Model
424H4B
424H4Y2
424H4Y5
Product Specifications
Transfer Function
4-Pole,
4-Pole, Chebychev,
4-Pole, Chebychev,
Butterworth
0.2 dB Ripple
0.5 dB Ripple
Size
0.8" x 1.8" x 0.3"
0.8" x 1.8" x 0.3"
0.8" x 1.8" x 0.3"
Range f
c
10.0 Hz to 102.4 kHz
10.0 Hz to 102.4 kHz
10.0 Hz to 102.4 kHz
Theoretical Transfer
Appendix A
Appendix A
Appendix A
Characteristics
Page 27
Page 31
Page 33
Passband Ripple
0.0 dB
0.20 dB
0.50 dB
(theoretical)
Voltage Gain
0 0.2 dB to 100 kHz
0 0.2 dB to 100 kHz
0 0.2 dB to 100 kHz
(non-inverting)
0 0.5 dB to 120 kHz
0 0.5 dB to 120 kHz
0 0.5 dB to 120 kHz
Power Bandwidth
120 kHz
120 kHz
120 kHz
Small Signal Bandwidth
(-6 dB) 1 MHz
(-6 dB) 1 MHz
(-6 dB) 1 MHz
Stopband
Attenuation Rate
24 dB/octave
24 dB/octave
24 dB/octave
Cutoff Frequency
f
c
2% max.
f
c
2% max.
f
c
2% max.
Stability
0.01% /C
0.01% /C
0.01% /C
Amplitude
-3 dB
-3 dB
-3 dB
Phase
-180
-231
-245
Filter Attenuation
40 dB 0.31 f
c
40.0 dB 0.41 f
c
40.0 dB 0.43 f
c
(theoretical)
30 dB 0.42 f
c
30.0 dB 0.53 f
c
30.0 dB 0.56 f
c
3.01 dB 1.00 f
c
3.01 dB 1.00 f
c
3.01 dB 1.00 f
c
0.02 dB 2.00 f
c
-0.07 dB 2.00 f
c
-0.25 dB 2.00 f
c
Phase Match
1
f
c
- 100 kHz
3 max.
f
c
- 100 kHz
3 max.
f
c
- 100 kHz
3 max.
1.5 typ.
1.5 typ.
1.5 typ.
Amplitude Accuracy
1.0 - 1.25 f
c
0.3 dB max. 1.0 - 1.25 f
c
0.3 dB max. 1.0 - 1.25 f
c
0.3 dB max.
(theoretical)
0.15 dB typ.
0.15 dB typ.
0.15 dB typ.
1.25 f
c
-100 kHz 0.2 dB max. 1.25 f
c
-100 kHz 0.2 dB max. 1.25 f
c
-100 kHz 0.2 dB max.
0.1 dB max.
0.1 dB typ.
0.1 dB typ.
Total Harmonic
< - 100 dB typ.
< - 88 dB typ.
< - 88 dB typ.
Distortion @ 1kHz
Wide Band Noise
400
mVrms typ.
400
mVrms typ.
400
mVrms typ.
(5 Hz - 2 MHz)
Narrow Band Noise
100
mVrms typ.
100
mVrms typ.
100
mVrms typ.
(5 Hz - 100 kHz)
Filter Mounting
Assembly
FMA-02A
FMA-02A
FMA-02A
1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.
4
Specification
(25C and Vs 15 Vdc)
424 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.
IN-00424-01
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
4-Pole
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.
424 L4L-7
Binary Tuning Ranges
Model
Tuning
*Minimum
Number
Range (Hz)
Step (Hz)
1
10-160
10
2
25-400
25
3
50-800
50
4
100-1.60k
100
5
250-4.00k
250
6
500-8.00k
500
7
1.00k-16.0k
1.00k
8
2.50k-40.0k
2.50k
9
5.00k-80.0k
5.00k
10
6.40k-102.4k
6.40k
*Contact factory for custom step frequency. Maximum step 6.40 kHz.
Discrete Frequency's
Customer must specify f
1
,f
2
,f
3
, f
4
,f
5
. Maximum span f
1
fi f
5
1,000:1.
Model Number
424 Transfer Function
B - Butterworth
L - Bessel
Y2 - 0.2 Ripple Chebychev
Y5 - 0.5 Ripple Chebychev
Filter Type
L - Low Pass
H - High Pass
Ordering Information
0.025 Dia.
All dimensions are in inches
All case dimensions 0.02"
0.15 min.
(Side View)
424
0.00
0.30
Bottom View
0.70
0.80
0.00
0.10
1.00
1.50
1.30
1.10
0.50
1.80
1.60
0.30
0.00
0.80
0.90
Gnd Os
-Vs +Vs
D0
D2 D3
D1
+5V
Out
In
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
Pin-Out & Package Data
All dimensions are in inches
All case dimensions 0.02
Filter Mounting Assembly-See FMA-02A
5
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