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. Programmable Tuning and Control Digital Tuning & Control Available 424 Low-Pass Models: (Click model number to view datasheet) 424L4B 4-pole Butterworth 424L4L 4-pole Bessel 424L4Y2 4-pole Cheby (0.2 dB Ripple) 424L4Y5 4-pole Cheby (0.5 dB Ripple)   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 424 High-Pass Models: (Click model number to view datasheet) 424H4B 4-pole Butterworth 424H4Y2 4-pole Cheby (0.2 dB Ripple) 424H4Y5 4-pole Cheby (0.5 dB Ripple) 4-Bit Programmable Filters   424 Series Digital Tuning & Control Characteristics   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 MSB --- --- LSB Bit Weight 23 D3 22 D2 21 D1 20 D0 fc - corner frequency 0 0 0 0 fmax /16 0 0 0 1 fmax /8 0 0 1 1 fmax /4 0 1 1 1 fmax /2 1 1 1 1 fmax 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 F D0 D1 D2 D3 FB 0 0 0 0 F1 1 0 0 0 F2 1 1 0 0 F3 1 1 1 0 F4 1 1 1 1 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 .     Pin-Out Key IN Analog Input Signal   D3 Tuning Bit 3 (MSB) OUT Analog Output Signal   D2 Tuning Bit 2 GND Power and Signal Return   D1 Tuning Bit 1 +Vs Supply Voltage, Positive   D0 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   -0.4µA typ.   -2.0µA max. Low Level In   +0.4µA typ.   +2.0µA 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)   D0   LSB (least significant bit)   D3   MSB (most significant bit) Frequency Range16:1 Binary Weighted     4-Bit Programmable                 4-Pole Low-Pass Filters Model 424L4B 424L4L 424L4Y2 424L4Y5 Product Specifications Transfer Function Size Range fc 4-Pole, Butterworth 0.8” x 1.8” x 0.3” 10.0 Hz to 102.4 kHz 4-Pole, Bessel 0.8” x 1.8” x 0.3” 10.0 Hz to 102.4 Hz  4-Pole, Chebychev, 0.2 dB Ripple 0.8” x 1.8” x 0.3” 10.0 Hz to 102.4 kHz 4-Pole, Chebychev, 0.5 dB Ripple 0.8” x 1.8” x 0.3” 10.0 Hz to 102.4 kHz Theoretical Transfer Characteristics Click to view Click to view Click to view Click to view Passband Ripple    (theoretical) 0.0 dB 0.0 dB 0.20 dB 0.50 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 24 dB/octave 24 dB/octave 24 dB/octave 24 dB min. Cutoff Frequency Stability Amplitude Phase fc          ± 2% max. ± 0.01% /°c -3 dB -180° fc          ± 2% max. ± 0.01% /°c -3 dB -121° fc          ± 2% max. ± 0.01% /°c -3 dB -231° fc          ± 2% max. ± 0.01% /°c -3 dB -245° Filter Attenuation    (theoretical) 0.67 dB       0.80 fc 3.01 dB       1.00 fc 30.0 dB       2.37 fc 40.0 dB       3.16 fc 1.86 dB       0.80 fc 3.01 dB       1.00 fc 30.0 dB       3.50 fc 40.0 dB       4.72 fc -0.20 dB      0.80 fc 3.01 dB       1.00 fc 30.0 dB       1.89 fc 40.0 dB       2.46 fc -0.43 dB      0.80 fc 3.01 dB       1.00 fc 30.0 dB       1.80 fc 40.0 dB       2.33 fc Phase Match1 0 - 0.8 fc ± 2° max. ± 1° typ. 0.8 fc - 1.0 fc ± 3° max. ± 1.5° typ. 0 - fc ± 2° max. ± 1° typ. 0 - 0.8 fc ± 2° max. ± 1° typ. 0.8 fc - 1.0 fc ± 3° max. ± 1.5° typ. 0 - 0.8 fc ± 2° max. ± 1° typ. 0.8 fc - 1.0 fc ± 3° max. ± 1.5° typ. 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. 0 - fc ± .2 dB max. ± .1 dB typ. 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. 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. Total Harmonic Distortion @ 1 kHz < - 100 dB typ. < - 100 dB typ. < - 88 dB typ. < - 88 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                 4-Pole High-Pass Filters Model 424H4B 424H4Y2 424H4Y5                                 Product Specifications Transfer Function Size Range fc 4-Pole Butterworth 0.8” x 1.8” x 0.3” 10.0 Hz to 102.4 Hz 4-Pole, Chebychev, 0.2 dB Ripple 0.8” x 1.8” x 0.3” 10.0 Hz to 102.4 kHz  4-Pole, Chebychev, 0.5 dB Ripple 0.8” x 1.8” x 0.3” 1.0 Hz to 102.4 Hz   Theoretical Transfer Characteristics Click to view Click to view Click to view   Passband Ripple    (theoretical) 0.0 dB 0.20 dB 0.50 dB   Voltage Gain    (non-inverting) 0 ± 0.2 dB to 100 Hz 0 ± 0.5 dB to 120 Hz 0 ± 0.2 dB to 100 kHz 0 ± 0.5 dB to 120 kHz 0 ± 0.2 dB to 100 Hz 0 ± 0.5 dB to 120 Hz   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 fc (-3dB) Stability Amplitude Phase fc          ± 2% max. ± 0.01% /°c -3 dB -180° fc          ± 2% max. ± 0.01% /°c -3 dB 231° fc          ± 2% max. ± 0.01% /°c -3 dB 245°   Filter Attenuation    (theoretical) 40 dB          0.31 fc 30.0 dB       0.42 fc 3.01 dB       1.00 fc 0.02 dB       2.00 fc 40 dB          0.41 fc 30.0 dB       0.53 fc 3.01 dB       1.00 fc -0.07 dB      2.00 fc 40 dB          0.43 fc 30.0 dB       0.56 fc 3.01 dB       1.00 fc -0.25 dB      2.00 fc   Phase Match1 fc - 100 kHz ± 3° max. ± 1.5° typ. fc - 100 kHz ± 3° max. ± 1.5° typ. fc - 100 kHz ± 3° max. ± 1.5° typ.   Amplitude Accuracy    (theoretical) 1.0 - 1.25 fc ± 0.3 dB max. ± 0.15 dB typ. 1.25 fc-100kHz ± 0.2 dB max. ± 0.1 dB typ. 1.0 - 1.25 fc ± 0.3 dB max. ± 0.15 dB typ. 1.25 fc-100kHz ± 0.2 dB max. ± 0.1 dB typ. 1.0 - 1.25 fc ± 0.3 dB max. ± 0.15 dB typ. 1.25 fc-100kHz ± 0.2 dB max. ± 0.1 dB typ.   Total Harmonic Distortion @ 1 kHz < - 100 dB typ. < - 88 dB typ. < - 88 dB typ.   Wide Band Noise    (5 Hz - 2 MHz) 400 µVrms typ. 400 µVrms typ. 400 µVrms typ.   Narrow Band Noise (5 Hz - 100 kHz) 100 µVrms typ. 100 µVrms typ. 100 µVrms typ.   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. Specifications (@ 25°C and Vs ±15 Vdc) 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. 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: 0 to + 70°C Storage: -25 to+85°C See note 4 Pin-Out and Package Data Filter Mounting Assembly-See FMA-02A Ordering Information Binary Tuning Ranges   Model Number Tuning Range (Hz) *Minimum 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 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.