424 Series
10 Hz to 102.4 kHz
4-Bit Programmable
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
32-Pin DIP
4-Pole 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
424 Series
4-Bit Programmable Filters
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
).
Digital Tuning &
Control Characteristics
Pin-Out Key
IN
Analog Input Signal
D
3
D
2
D
0
Tuning Bit 3 (MSB)
Tuning Bit 2
Tuning Bit 1
Tuning Bit 0 (LSB)
OUT Analog Output Signal
Binary Tuning Range
MSB
2
D
3
0
0
0
0
1
3
GND Power and Signal Return D
1
LSB
2
D
0
0
1
1
1
1
0
---
2
D
2
0
0
0
1
1
2
---
2
D
1
0
0
1
1
1
1
Bit
Weight
fc - corner
frequency
f
max
/16
f
max
/8
f
max
/4
f
max
/2
f
max
+Vs
-Vs
Os
0.80
0.70
Supply Voltage, Positive
Supply Voltage, Negative +5V Logic Power
Offset Adjustment
Bottom View
Out
D0
D1
Gnd Os
4
-Vs +Vs
+5V
D2 D3
In
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
0.10
0.00
0.80
0.90
1.00
1.10
1.50
1.60
0.00
1.30
1.80
0.30
0.50
Discrete Frequencies
F
F
B
F
1
F
2
F
3
F
4
D
0
0
1
1
1
1
D
1
0
0
1
1
1
D
2
0
0
0
1
1
D
3
0
0
0
0
1
Data Input Specifications
Input Data Levels
Input Voltage (
Vs=15 Vdc
)
Low Level In
High Level In
Input Current
High Level In
Low Level In
Input Capacitance
Input Data Format
Positive Logic
(+5Vdc CMOS Logic)
0 Vdc min.
3.5 Vdc min.
0.5 Vdc max.
5.0 Vdc max.
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
.
-0.4mA typ.
+0.4mA typ.
20 pF typ.
-2.0mA max.
+2.0mA max.
30 pF max.
Frequency Select Bits
Logic “1” = (+5Vdc)
Logic “0” = Gnd
(Binary-Coded)
LSB (least significant bit)
MSB (most significant bit)
Bit Weight
D
0
D
3
Frequency Range16:1 Binary Weighted
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
424 Series
4-Bit Programmable
Model
Product Specifications
Transfer Function
Size
Range fc
Theoretical Transfer
Characteristics
Passband Ripple
(theoretical)
4-Pole
Low-Pass Filters
424L4L
424L4Y2
424L4Y5
424L4B
4-Pole,
Butterworth
0.8” x 1.8” x 0.3”
10.0 Hz to 102.4 kHz
Appendix A
Page 7
0.0 dB
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
24 dB/octave
f
c
± 0.01% /°C
-3 dB
-180°
0.67 dB
3.01 dB
30.0 dB
40.0 dB
0 - 0.8 f
c
± 2% max.
4-Pole,
Bessel
0.8" x 1.8" x 0.3"
10.0 Hz to 102.4 kHz
Appendix A
Page 2
0.0 dB
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
24 dB/octave
f
c
± 0.01% /°C
-3 dB
-121°
1.86 dB
3.01 dB
30.0 dB
40.0 dB
0 - f
c
± 2% max.
4-Pole, Chebychev,
0.2 dB Ripple
0.8" x 1.8" x 0.3"
10.0 Hz to 102.4 kHz
Appendix A
Page 12
0.20 dB
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
24 dB/octave
f
c
± 0.01% /°C
-3 dB
-231°
-0.20 dB
3.01 dB
30.0 dB
40.0 dB
0 - 0.8 f
c
0.8 f
c
- 1.0 f
c
± 2% max.
4-Pole, Chebychev,
0.5 dB Ripple
0.8" x 1.8" x 0.3"
10.0 Hz to 102.4 kHz
Appendix A
Page 15
0.50 dB
0 ± 0.1 dB max.
0 ± 0.05 dB typ.
24 dB min.
f
c
± 0.01% /°C
-3 dB
-245°
-0.43 dB
3.01 dB
30.0 dB
40.0 dB
0 - 0.8 f
c
0.8 f
c
- 1.0 f
c
± 2% max.
DC Voltage Gain
(non-inverting)
Stopband
Attenuation Rate
Cutoff Frequency
Stability
Amplitude
Phase
Filter Attenuation
(theoretical)
0.80 f
c
1.00 f
c
2.37 f
c
3.16 f
c
0.80 f
c
1.00 f
c
3.50 f
c
4.72 f
c
± 2° max.
± 1° typ.
0.80 f
c
1.00 f
c
1.89 f
c
2.46 f
c
± 2° max.
± 1° typ.
± 3° max.
± 1.5° typ.
0.80 f
c
1.00 f
c
1.80 f
c
2.33 f
c
± 2° max.
± 1° typ.
± 3° max.
± 1.5° typ.
± 0.2 dB max.
± 0.1 dB typ.
± 0.3 dB max.
± 0.15 dB typ.
Phase Match
1
± 2° max.
± 1° typ.
0.8 f
c
- 1.0 f
c
± 3° max.
± 1.5° typ.
Amplitude Accuracy
(theoretical)
± 0.2 dB max.
± 0.1 dB typ.
0.8 f
c
- 1.0 f
c
± 0.3 dB max.
± 0.15 dB typ.
< - 100 dB typ.
200
mVrms
typ.
50
mVrms
typ.
0 - 0.8 f
c
0 - f
c
± 0.2 dB max. 0 - 0.8 f
c
± 0.2 dB max. 0 - 0.8 f
c
± 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
± 0.15 dB typ.
< - 88 dB typ.
200
mVrms
typ.
50
mVrms
typ.
< - 88 dB typ.
Total Harmonic
Distortion @ 1 kHz
Wide Band Noise
(5 Hz - 2 MHz)
< - 100 dB typ.
200
mVrms
typ.
50
mVrms
typ.
200
mVrms
typ.
50
mVrms
typ.
Narrow Band Noise
(5 Hz - 100 kHz)
Filter Mounting
Assembly
FMA-02A
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.
3
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
424 Series
4-Bit Programmable
Model
Product Specifications
Transfer Function
Size
Range f
c
Theoretical Transfer
Characteristics
Passband Ripple
(theoretical)
4-Pole
High-Pass Filters
424H4Y2
424H4Y5
424H4B
4-Pole,
Butterworth
0.8” x 1.8” x 0.3”
10.0 Hz to 102.4 kHz
Appendix A
Page 27
0.0 dB
0 ± 0.2 dB to 100 kHz
0 ± 0.5 dB to 120 kHz
120 kHz
(-6 dB) 1 MHz
24 dB/octave
f
c
± 0.01% /°C
-3 dB
-180°
40 dB
30 dB
3.01 dB
0.02 dB
± 2% max.
4-Pole, Chebychev,
0.2 dB Ripple
0.8" x 1.8" x 0.3"
10.0 Hz to 102.4 kHz
Appendix A
Page 31
0.20 dB
0 ± 0.2 dB to 100 kHz
0 ± 0.5 dB to 120 kHz
120 kHz
(-6 dB) 1 MHz
24 dB/octave
f
c
± 0.01% /°C
-3 dB
-231°
40.0 dB
30.0 dB
3.01 dB
-0.07 dB
f
c
- 100 kHz
± 2% max.
4-Pole, Chebychev,
0.5 dB Ripple
0.8" x 1.8" x 0.3"
10.0 Hz to 102.4 kHz
Appendix A
Page 33
0.50 dB
0 ± 0.2 dB to 100 kHz
0 ± 0.5 dB to 120 kHz
120 kHz
(-6 dB) 1 MHz
24 dB/octave
f
c
± 0.01% /°C
-3 dB
-245°
40.0 dB
30.0 dB
3.01 dB
-0.25 dB
f
c
- 100 kHz
± 2% max.
Voltage Gain
(non-inverting)
Power Bandwidth
Small Signal Bandwidth
Stopband
Attenuation Rate
Cutoff Frequency
Stability
Amplitude
Phase
Filter Attenuation
(theoretical)
0.31 f
c
0.42 f
c
1.00 f
c
2.00 f
c
0.41 f
c
0.53 f
c
1.00 f
c
2.00 f
c
± 3° max.
± 1.5° typ.
0.43 f
c
0.56 f
c
1.00 f
c
2.00 f
c
± 3° max.
± 1.5° typ.
Phase Match
1
f
c
- 100 kHz ± 3° max.
± 1.5° typ.
1.0 - 1.25 f
c
Amplitude Accuracy
(theoretical)
± 0.3 dB max. 1.0 - 1.25 f
c
± 0.15 dB typ.
1.25 f
c
-100 kHz ± 0.2 dB max. 1.25 f
c
-100 kHz
± 0.1 dB max.
< - 100 dB typ.
400
mVrms
typ.
100
mVrms
typ.
< - 88 dB typ.
± 0.3 dB max. 1.0 - 1.25 f
c
± 0.3 dB max.
± 0.15 dB typ.
± 0.15 dB typ.
± 0.2 dB max. 1.25 f
c
-100 kHz ± 0.2 dB max.
± 0.1 dB typ.
± 0.1 dB typ.
< - 88 dB typ.
400
mVrms
typ.
100
mVrms
typ.
Total Harmonic
Distortion @ 1kHz
Wide Band Noise
(5 Hz - 2 MHz)
400
mVrms
typ.
100
mVrms
typ.
Narrow Band Noise
(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
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
424 Series
Specification
(25°C and Vs ± 15 Vdc)
Analog Input Characteristics
1
Impedance
Voltage Range
Max. Safe Voltage
Analog Output Characteristics
Impedance (Closed Loop)
Linear Operating Range
Maximum Current
2
Offset Voltage
3
Offset Temp. Coeff.
Power Supply (
±
V)
Rated Voltage
Operating Range
Maximum Safe Voltage
Quiescent Current
4-Pole
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
0.30
424
0.00
0.025 Dia.
All dimensions are in inches
All dimensions are in inches
All case
dimensions ±0.02
All case
dimensions ±0.02"
10 k
W
min.
±
10 Vpeak
±
Vs
11
W
typ.
10
W
max.
±
10V
±
2 mA
22
mV typ.
20 mV max.
50
mV/°C
(Side View)
0.15 min.
0.80
0.70
Out
D0
0.10
0.00
Bottom View
Gnd Os
4
-Vs +Vs
D1
+5V
D2 D3
In
0.80
0.90
1.00
1.10
0.00
±
15 Vdc
±
12 to
±
18 Vdc
±
18 Vdc
±
13 mA typ.
±
20 mA max.
-20
to +70°C
-25 to +85°C
Filter Mounting Assembly-See FMA-02A
Ordering Information
Filter Type
L
- Low Pass
H
- High Pass
424 Transfer Function
B
- Butterworth
L
- Bessel
Y2
- 0.2 Ripple Chebychev
Y5
- 0.5 Ripple Chebychev
424 L4L-7
Model Number
Binary Tuning Ranges
DC Offset Adjustment
± Vs
Do not connect
if trim is not
required.
20 k
W
(Cermet)
OS
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.
- Vs
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
5
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
1.50
1.60
1.30
1.80
0.30
0.50
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