Description The D61 Series of small 4-pole fixed-frequency, precision active filters provide high performance linear active filtering in a compact 32-pin DIP package, with a broad range of corner frequencies and a choice of transfer functions. Individual D61 filters can serve in low-pass or high-pass applications or be combined to create custom band-pass or band reject filters. These fully self-contained units require no external components or adjustments. Each model comes factory tuned to a user-specified corner frequency between 0.02 Hz and 1.00 Hz and operate with low total harmonic distortion over a wide dynamic input voltage range from non-critical +/-5V to +/-18V power supplies. Features/Benefits: Low harmonic distortion and wide signal-to-noise ratio Compact 1.8"L x 0.8"W x 0.5"H 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 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 Sound and vibration testing Acoustic and vibration analysis and control Noise elimination Signal reconstruction Available Low-Pass Models: D61L4B 4-pole Butterworth D61L4L 4-pole Bessel   Available High-Pass Models: D61H4B 4-pole Butterworth Fixed Frequency 4-Pole Low-Pass and High-Pass Filters Model D61L4B D61L4L   Model D61H4B Product Specifications   Low-Pass   High-Pass Transfer Function Size Range fc    D61 4-Pole, Butterworth 1.8” x 0.8” x 0.5” 0.02 Hz to 1.00 Hz 4-Pole, Bessel 1.8” x 0.8” x 0.5” 0.02 Hz to 1.00 Hz   Transfer Function Size Range fc    D61 4-Pole, Butterworth 1.8” x 0.8” x 0.5” 0.02 Hz to 1.00 Hz Theoretical Transfer Characteristics Click to view Click to view     Click to view Passband Ripple    (theoretical) 0.0 dB 0.0 dB   Passband Ripple    (theoretical) 0.0 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.   Voltage Gain    (non-inverting) 0 ± 0.2 dB to 100 kHz 0 ± 0.5 dB to 120 kHz         Power Bandwidth 120 kHz         Small Signal Bandwidth (-6 dB) 1 MHz Stopband Attenuation Rate 24 dB/octave 24 dB/octave   Stopband Attenuation Rate 24 dB/octave Cutoff Frequency Stability Amplitude Phase fc          ± 2% max. ± 0.01% /°c -3 dB -180° fc          ± 2% max. ± 0.01% /°c -3 dB -121°   Cutoff Frequency Stability Amplitude Phase fc          ± 2% max. ± 0.01% /°c -3 dB -180° 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   Filter Attenuation    (theoretical) 40.0 dB       0.31 fc 30.0 dB       0.42 fc 3.01 dB       1.00 fc 0.02 dB       2.00 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.   Phase Match1 0 -100 kHz ± 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 ± 0.2 dB max. ± 0.1 dB typ.   Amplitude Accuracy    (theoretical) 1.0 - 1.25 fc ± 0.30 dB max. ± 0.15 dB typ. 1.25 fc - 100 kHz ± 0.20 dB max. ± 0.10 dB typ. Wide Band Noise    (5 Hz - 2 MHz) 200 µVrms typ. 200 µVrms typ.   Wide Band Noise    (5 Hz - 2 MHz) 400 µVrms typ. Narrow Band Noise   (20 Hz - 100 kHz) 50 µVrms typ. 50 µVrms typ.   Narrow Band Noise   (20 Hz - 100 kHz) 100 µVrms typ. Filter Mounting Assembly FMA-01S FMA-01S   Filter Mounting Assembly FMA-01S Specifications (@ 25°C and Vs ±15 Vdc) Analog Input Characteristics1 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., 10 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. How to Specify Corner Frequency: Corner frequencies are specified by attaching a three digit frequency designator to the basic model number. Corner frequencies can range from 0.05 Hz to 100 Hz. Power Supply (+/-V) Rated Voltage: ± 15 Vdc Operating Range: ± 5 to ± 18 Vdc Maximum Safe Voltage: ± 18 Vdc Quiescent Current D61: ± 12.5 mA typ., ± 20 mA max. Temperature Operating: 0 to + 70°C Storage: -25 to+85°C Pin-Out and Package Data Filter Mounting Assembly-See FMA-01S 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.