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Description
The 428 Series are 8-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. 428 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 428 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 0.5"H (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.
- Programmable Tuning and Control
- Digital Tuning & Control
Available 428 Low-Pass Models:
(Click model number to view datasheet)
- 428L4B
- 8-pole Butterworth
- 428L4E
- 8-pole, 6 zero elliptic, 1.77 (-80dB)
- 428L4EX
- 8-pole, 6 zero elliptic, 1.56 (-80dB)
- 428L4EY
- 8-pole, 6 zero elliptic, 2.00 (-100dB)
- 428L4L
- 8-pole Bessel
- 428L4D60
- 8-pole constant delay (-60 dB)
- 428L4D80
- 8-pole constant delay (-80 dB)
- 428L4D10
- 8-pole constant delay (-100 dB)
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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
Available 428 High-Pass Models:
(Click model number to view datasheet)
- 428H4B
- 8-pole Butterworth
- 428H4E
- 8-pole, 6 zero elliptic, 1.77 (-80dB)
- 428H4EX
- 8-pole, 6 zero elliptic, 1.56 (-80dB)
- 428H4EY
- 8-pole, 6 zero elliptic, 2.00 (-100dB)
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4-Bit Programmable
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428 Series
Digital Tuning &
Control Characteristics
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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 (D0 - D3 ).
Binary Tuning Range
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MSB
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---
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---
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LSB
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Bit
Weight
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23
D3
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22
D2
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21
D1
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20
D0
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fc - corner
frequency
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0
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0
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0
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0
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fmax /16
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0
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0
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0
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1
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fmax /8
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0
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0
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1
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1
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fmax /4
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0
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1
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1
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1
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fmax /2
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1
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1
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1
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1
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fmax
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Binary Tuning Equation:
fc = (f max /16) [1+ D3 x 23 + D2 x 22 + D1 x 21 + D0 x 20]
where D1 - D3 = “0” or “1”, and
f max = Maximum tuning frequency
fc = Corner frequency;
Minimum tunable frequency = f max /16 (D0 thru D3 = 0);
Minimum frequency step (Resolution) = f max /16
Discrete Frequencies
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F
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D0
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D1
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D2
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D3
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F0
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0
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0
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0
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0
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F1
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1
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0
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0
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0
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F2
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1
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1
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0
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0
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F3
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1
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1
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1
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0
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F4
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1
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1
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1
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1
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Discrete Tuning Equation:
fc = FB + D0 [ f0 ] + D1 [f1 ] + D2 [f2 ] + D3 [f3 ]
f0 , f1 , f2 , f3 are the incremental frequency shifts for the data bits D0 , D1 , D2 and D3 . They are selected to realize the five customer specified programming frequencies FB => F4 . Other programming codes produce valid fc’s between FB and F4 .
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Pin-Out Key
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IN
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Analog Input Signal
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D3
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Tuning Bit 3 (MSB)
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OUT
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Analog Output Signal
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D2
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Tuning Bit 2
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GND
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Power and Signal Return
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D1
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Tuning Bit 1
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+Vs
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Supply Voltage, Positive
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D0
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Tuning Bit 0 (LSB)
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-Vs
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Supply Voltage, Negative
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+5V
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Logic Power
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Os
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Offset Adjustment
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Data Input Specifications
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Input Data Levels
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(+5Vdc CMOS Logic)
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| Input Voltage (Vs=15 Vdc ) |
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| Low Level In |
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0 Vdc min. |
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0.5 Vdc max. |
| High Level In |
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3.5 Vdc min. |
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5.0 Vdc max. |
| Input Current |
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| High Level In |
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-0.4µA typ. |
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-2.0µA max. |
| Low Level In |
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+0.4µA typ. |
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+2.0µA max. |
| Input Capacitance |
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20 pF typ. |
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30 pF max. |
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Input Data Format
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Frequency Select Bits
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| Positive Logic |
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Logic “1” = (+5Vdc) |
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Logic “0” = Gnd |
| Bit Weight |
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(Binary-Coded) |
| D0 |
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LSB (least significant bit) |
| D3 |
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MSB (most significant bit) |
Frequency Range16:1 Binary Weighted
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4-Bit Programmable 8-Pole Low-Pass Filters
| Model |
428L4B |
428L4E |
428L4EX |
428L4EY |
| Product Specifications |
| Transfer Function
Size
Range fc, fr |
8-Pole
Butterworth
0.8” x 1.8” x 0.5”
10.0 Hz to 102.4 kHz |
8-Pole, 6 zero
Elliptic
0.8" x 1.8" x 0.5"
10.0 Hz to 102.4 kHz |
8-Pole, 6 zero
Elliptic
0.8" x 1.8" x 0.5"
10.0 Hz to 102.4 kHz |
8-Pole, 6 zero
Elliptic
0.8" x 1.8" x 0.5"
10.0 Hz to 102.4 kHz |
Theoretical Transfer
Characteristics |
Click to view
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Click to view
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Click to view
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Click to view
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Passband Ripple
(theoretical) |
0.0 dB |
± 0.035 dB |
0.05 dB |
0.05 dB |
DC Voltage Gain
(non-inverting) |
0 ± 0.1 dB max.
0 ± 0.05 dB typ. |
0 ± 0.1 dB max.
0 ± 0.05 dB typ. |
0 ± 0.1 dB max.
0 ± 0.05 dB typ. |
0 ± 0.1 dB max.
0 ± 0.05 dB typ. |
Stopband
Attenuation Rate |
48 dB/octave |
80 dB min. |
80 dB min. |
100 dB min. |
Cutoff Frequency
Stability
Amplitude
Phase |
fc ± 2% max.
± 0.01% /°c
-3 dB
-360° |
fr ± 2% max.
± 0.01% /°c
-0.035 dB
-323.5° |
fr ± 2% max.
± 0.01% /°c
-0.05 dB
-414° |
fr ± 2% max.
± 0.01% /°c
-0.05 dB
-419° |
Filter Attenuation
(theoretical) |
0.12 dB 0.80 fc
3.01 dB 1.00 fc
60.0 dB 2.37 fc
80.0 dB 3.16 fc |
0.035 dB 1.00 fr
3.01 dB 1.13 fr
60.0 dB 1.67 fr
80.0 dB 1.77 fr |
0.05 dB 1.00 fr
3.01 dB 1.05 fr
60.0 dB 1.45 fr
80.0 dB 1.56 fr |
0.05 dB 1.00 fr
3.01 dB 1.06 fr
80.0 dB 1.83 fr
100.0 dB 2.00 fr |
| Phase Match1 |
- 0 - 0.8 fc
- ± 2° max.
± 1° typ.
- 0.8 fc - 1.0 fc
- ± 3° max.
± 1.5° typ.
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- 0 - 0.8 fr
- ± 2° max.
± 1° typ.
- 0.8 fr - 1.0 fr
- ± 4° max.
± 2° typ.
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- 0 - 0.8 fr
- ± 3° max.
± 1.5° typ.
- 0.8 fr - 1.0 fr
- ± 4° max.
± 2° typ.
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- 0 - 0.8 fr
- ± 3° max.
± 1.5° typ.
- 0.8 fr - 1.0 fr
- ± 4° max.
± 2° typ.
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Amplitude Accuracy
(theoretical) |
- 0 - 0.8 fc
- ± 0.2 dB max.
± 0.1 dB typ.
- 0.8 fc - 1.0 fc
- ± 0.3 dB max.
± 0.15 dB typ.
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- 0 - 0.8 fr
- ± .2 dB max.
± .1 dB typ.
- 0.8 fr - 1.0 fr
- ± .3 dB max.
± .15 dB typ.
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- 0 - 0.8 fr
- ± 0.2 dB max.
± 0.1 dB typ.
- 0.8 fr - 1.0 fr
- ± 0.5 dB max.
± 0.25 dB typ.
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- 0 - 0.8 fr
- ± 0.2 dB max.
± 0.1 dB typ.
- 0.8 fr - 1.0 fr
- ± 0.5 dB max.
± 0.25 dB typ.
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Total Harmonic
Distortion @ 1 kHz |
< -100 dB typ. |
< - 88 dB typ. |
< - 88 dB typ. |
< - 88 dB typ. |
Wide Band Noise
(5 Hz - 2 MHz) |
200 µVrms typ. |
200 µVrms typ. |
250 µVrms typ. |
250 µVrms typ. |
Narrow Band Noise
(5 Hz - 100 kHz) |
50 µVrms typ. |
50 µVrms typ. |
75 µVrms typ. |
75 µVrms typ. |
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 |
4-Bit Programmable 8-Pole Low-Pass Filters
| Model |
428L4L |
428L4D60 |
428L4D80 |
428L4D10 |
| Product Specifications |
| Transfer Function
Size
Range fc, fr |
8-Pole
Bessel
0.8” x 1.8” x 0.5”
10.0 Hz to 102.4 kHz |
8-Pole, 6 zero
Constant Delay
0.8" x 1.8" x 0.5"
10.0 Hz to 102.4 kHz |
8-Pole, 6 zero
Constant Delay
0.8" x 1.8" x 0.5"
10.0 Hz to 102.4 kHz |
8-Pole, 6 zero
Constant Delay
0.8" x 1.8" x 0.5"
10.0 Hz to 102.4 kHz |
Theoretical Transfer
Characteristics |
Click to view
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Click to view
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Click to view
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Click to view
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Passband Ripple
(theoretical) |
0.0 dB |
0.15 dB |
0.15 dB |
0.15 dB |
DC Voltage Gain
(non-inverting) |
0 ± 0.1 dB max.
0 ± 0.05 dB typ. |
0 ± 0.1 dB max.
0 ± 0.05 dB typ. |
0 ± 0.1 dB max.
0 ± 0.05 dB typ. |
0 ± 0.1 dB max.
0 ± 0.05 dB typ. |
Stopband
Attenuation Rate |
48 dB/octave |
60 dB min. |
80 dB min. |
100 dB min. |
Cutoff Frequency
Stability
Amplitude
Phase |
fc ± 2% max.
± 0.01% /°c
-3 dB
-182° |
fc ± 2% max.
± 0.01% /°c
-3 dB
-306° |
fc ± 2% max.
± 0.01% /°c
-3 dB
-306° |
fc ± 2% max.
± 0.01% /°c
-3 dB
-311° |
Filter Attenuation
(theoretical) |
1.91 dB 0.80 fc
3.01 dB 1.00 fc
60.0 dB 4.52 fc
80.0 dB 6.07 fc |
3.01 dB 1.00 fc
40.0 dB 2.28 fc
60.0 dB 2.64 fc |
3.01 dB 1.00 fc
60.0 dB 3.08 fc
80.0 dB 3.57 fc |
3.01 dB 1.00 fc
80.0 dB 4.45 fc
100.0 dB 5.20 fc |
| Phase Match1 |
- 0 - fc
- ± 2° max.
± 1° typ.
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- 0 - fc
- ± 2° max.
± 1° typ.
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- 0 - fc
- ± 2° max.
± 1° typ.
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- 0 - fc
- ± 2° max.
± 1° typ.
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Amplitude Accuracy
(theoretical) |
- 0 - fc
- ± 0.2 dB max.
± 0.1 dB typ.
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- 0 - 0.8 fc
- ± 0.2 dB max.
± 0.1 dB typ.
- 0.8 fc - 1.0 fc
- ± 0.3 dB max.
± 0.15 dB typ.
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- 0 - 0.8 fc
- ± 0.2 dB max.
± 0.1 dB typ.
- 0.8 fc - 1.0 fc
- ± 0.3 dB max.
±0.15 dB typ.
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- 0 - 0.8 fc
- ± 0.2 dB max.
± 0.1 dB typ.
- 0.8 fc - 1.0 fc
- ± 0.3 dB max.
±0 .15 dB typ.
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Total Harmonic
Distortion @ 1 kHz |
< - 100 dB typ. |
< - 100 dB typ. |
< - 100 dB typ. |
< - 100 dB typ. |
Wide Band Noise
(5 Hz - 2 MHz) |
200 µVrms typ. |
200 µVrms typ. |
200 µVrms typ. |
200 µVrms typ. |
Narrow Band Noise
(5 Hz - 100 kHz) |
50 µVrms typ. |
50 µVrms typ. |
50 µVrms typ. |
50 µVrms typ. |
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 |
4-Bit Programmable 8-Pole High-Pass Filters
| Model |
428H4B |
428H4E |
428H4EX |
428H4EY |
| Product Specifications |
| Transfer Function
Size
Range fc, fr |
8-Pole
Butterworth
0.8” x 1.8” x 0.5”
10.0 Hz to 102.4 kHz |
8-Pole, 6 zero
Elliptic
0.8" x 1.8" x 0.5"
10.0 Hz to 102.4 kHz |
8-Pole, 6 zero
Elliptic
0.8" x 1.8" x 0.5"
10.0 Hz to 102.4 kHz |
8-Pole, 6 zero
Elliptic
0.8" x 1.8" x 0.5"
10.0 Hz to 102.4 kHz |
Theoretical Transfer
Characteristics |
Click to view
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Click to view
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Click to view
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Click to view
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Passband Ripple
(theoretical) |
0.0 dB |
± 0.035 dB |
0.05 dB |
0.05 dB |
Voltage Gain
(non-inverting) |
0 ± 0.2 dB to 100 kHz
0 ± 0.5 dB to 120 kHz |
0 ± 0.2 dB to 100 kHz
0 ± 0.5 dB to 120 kHz |
0 ± 0.2 dB to 100 kHz
0 ± 0.5 dB to 120 kHz |
0 ± 0.2 dB to 100 kHz
0 ± 0.5 dB to 120 kHz |
| Power Bandwidth |
120 kHz |
120 kHz |
120 kHz |
120 kHz |
Small Signal
Bandwidth |
(-6 dB) 1 MHz |
(-6 dB) 1 MHz |
(-6 dB) 1 MHz |
(-6 dB) 1 MHz |
Stopband
Attenuation Rate |
48 dB/octave |
80 dB min. |
80 dB min. |
100 dB min. |
Cutoff Frequency
Stability
Amplitude
Phase |
fc ± 2% max.
± 0.01% /°c
-3 dB
-360° |
fr ± 2% max.
± 0.01% /°c
-0.035 dB
-323.5° |
fr ± 2% max.
± 0.01% /°c
-0.05 dB
-414° |
fr ± 2% max.
± 0.01% /°c
-0.05 dB
-419° |
Filter Attenuation
(theoretical) |
80 dB 0.31 fc
60.0 dB 0.42 fc
3.01 dB 1.00 fc
0.00 dB 2.00 fc |
80 dB 0.56 fr
60.0 dB 0.60 fr
3.01 dB 0.88 fr
0.03 dB 1.00 fr
0.00 dB 2.00 fr |
80 dB 0.64 fr
60.0 dB 0.69 fr
3.01 dB 0.95 fr
0.03 dB 1.00 fr
0.00 dB 2.00 fr |
100 dB 0.50 fr
80.0 dB 0.55 fr
3.01 dB 0.94 fr
0.03 dB 1.00 fr
0.00 dB 2.00 fr |
| Phase Match1 |
- fc - 100 kHz
- ± 3° max.
± 1.5° typ.
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- fr - 1.25 fr
- ± 4° max.
± 2° typ.
- 1.25 fr-100 kHz
- ± 2° max.
± 1° typ.
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- fr - 1.25 fr
- ± 4° max.
± 2° typ.
- 1.25 fr-100 kHz
- ± 2° max.
± 1° typ.
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- fr - 1.25 fr
- ± 4° max.
± 2° typ.
- 1.25 fr-100 kHz
- ± 3° max.
± 1.5° typ.
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Amplitude Accuracy
(theoretical) |
- fc-1.25 fc
- ± 0.3 dB max.
± 0.15 dB typ.
- 1.25 fc-100kHz
- ± 0.2 dB max.
± 0.1 dB typ.
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- fr-1.25 fr
- ± 0.3 dB max.
± 0.15 dB typ.
- 1.25 fr-100kHz
- ± 0.2 dB max.
± 0.1 dB typ.
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- fr-1.25 fr
- ± 0.5 dB max.
± 0.25 dB typ.
- 1.25 fr-100kHz
- ± 0.2 dB max.
± 0.1 dB typ.
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- fr-1.25 fr
- ± 0.5 dB max.
± 0.25 dB typ.
- 1.25 fr-100kHz
- ± 0.2 dB max.
± 0.1 dB typ.
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Total Harmonic
Distortion @ 1 kHz |
< - 100 dB typ. |
< - 88 dB typ. |
< - 88 dB typ. |
< - 88 dB typ. |
Wide Band Noise
(5 Hz - 2 MHz) |
400 µVrms typ. |
400 µVrms typ. |
500 µVrms typ. |
500 µVrms typ. |
Narrow Band Noise
(5 Hz - 100 kHz) |
100 µVrms typ. |
100 µVrms typ. |
150 µVrms typ. |
150 µVrms typ. |
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 |
Specifications
(@ 25°C and Vs ±15 Vdc)
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Analog Input Characteristics 1
- Impedance: 10 kΩ min.
- Voltage Range: ± 10 Vpeak
- Max. Safe Voltage: ± Vs
Analog Output Characteristics
- Impedance(Closed Loop):
1 Ω typ.
10 Ω max.
- Linear Operating Range: ± 10 V
- Maximum Current2: ± 2 mA
- Offset Voltage3:
2 mV typ.
20 mV max.
- Offset Temp. Coeff.: 50 µV / °C
Notes:
- Input and output signal voltage referenced to supply common.
- Output is short circuit protected to common. DO NOT CONNECT TO ±Vs.
- Adjustable to zero.
- Units operate with or without offset pin connected.
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Power Supply (+/-V)
- Rated Voltage: ± 15 Vdc
- Operating Range: ± 12 to ± 18 Vdc
- Maximum Safe Voltage: ± 18 Vdc
- Quiescent Current:
±25 mA typ.
±40 mA max.
Temperature
- Operating: 0 to + 70°C
- Storage: -25 to+85°C
See note 4
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Pin-Out and Package Data
Filter Mounting Assembly-See FMA-02A
Ordering Information
Binary Tuning Ranges
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Model Number
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Tuning Range (Hz)
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*Minimum Step (Hz)
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1
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10-160
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10
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2
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25-400
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25
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3
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50-800
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50
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4
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100-1.60k
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100
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5
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250-4.00k
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250
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6
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500-8.00k
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500
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7
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1.00k-16.0k
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1.00k
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8
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2.50k-40.0k
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2.50k
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9
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5.00k-80.0k
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5.00k
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10
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6.40k-102.4k
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6.40k
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*Contact factory for custom step frequency. Maximum step 6.40 kHz.
Discrete Frequency’s
Customer must specify f1 ,f2 ,f3 , f4 ,f5 . Maximum span f1 => f5 1,000:1.
Contact factory for custom frequency’s |
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.
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