Description The D68 and DP68 Series of small 8-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 D68 filters can serve in low-pass or high-pass applications (DP68, low-pass only) 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 1 Hz and 100 kHz (DP68, 1 Hz to 5 kHz) 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 to 16 bit resolution Compact 1.8"L x 0.8"W x 0.3"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   Available High-Pass Models: D68H8B 8-pole Butterworth D68H8E 8-pole, 6 zero elliptic, 1.77 (-80dB) D68H8EX 8-pole, 6 zero elliptic, 1.56 (-80dB) D68H8EY 8-pole, 6 zero elliptic, 2.00 (-100dB)   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: D68L8B & DP68L8B 8-pole Butterworth D68L8E & DP68L8E 8-pole, 6 zero elliptic, 1.77 (-80dB) D68L8EX & DP68L8EX 8-pole, 6 zero elliptic, 1.56 (-80dB) D68L8EY & DP68L8EY 8-pole, 6 zero elliptic, 2.00 (-100dB) D68L8L & DP68L8L 8-pole Bessel D68L8D60 & DP68L8D60 8-pole constant delay (-60 dB) D68L8D & DP68L8D 8-pole constant delay (-80dB) D68L8D10 & DP68L8D10 8-pole constant delay (-100dB) Fixed Frequency 8-Pole Low-Pass Filters Model D68L8B & DP68L8B D68L8E & DP68L8E D68L8EX & DP68L8EX D68L8EY & DP68L8EY Product Specifications Transfer Function Size Range fc, fr    D68    DP68 8-Pole Butterworth 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz 1 Hz to 5 kHz 8-Pole, 6 zero Elliptic 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz 1 Hz to 5 kHz 8-Pole, 6 zero Elliptic 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz 1 Hz to 5 kHz 8-Pole, 6 zero Elliptic 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz 1 Hz to 5 kHz Theoretical Transfer Characteristics Click to view Click to view Click to view Click to view 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         ± 1% max. ± 0.01% /°c -3 dB -360° fr         ± 1% max. ± 0.01% /°c -0.035 dB -323.5° fr         ± 1% 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. 0 - 0.8 fr ± 2° max. ± 1° typ. 0.8 fr - 1.0 fr ± 4° max. ± 2° typ. 0 - 0.8 fr ± 3° max. ± 1.5° typ. 0.8 fr - 1.0 fr ± 4° max. ± 2° typ. 0 - 0.8 fr ± 3° max. ± 1.5° typ. 0.8 fr - 1.0 fr ± 4° max. ± 2° 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 - 0.8 fr ± 0.2 dB max. ± 0.1 dB typ. 0.8 fr - 1.0 fr ± 0.3 dB max. ± 0.15 dB typ. 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. 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. Total Harmonic Distortion @ 1 kHz    D68    DP 68 < - 100 dB typ. < - 80 dB typ. < - 88 dB typ. < - 80 dB typ. < - 88 dB typ. < - 80 dB typ. < - 88 dB typ. < - 80 dB typ. Wide Band Noise    (5 Hz - 2 MHz) 200 µVrms typ. 200 µVrms typ. 250 µVrms typ. 250 µVrms typ. Narrow Band Noise (20 Hz - 100 kHz) 50 µVrms typ. 50 µVrms typ. 75 µVrms typ. 75 µVrms typ. Filter Mounting Assembly FMA-01S FMA-01S FMA-01S FMA-01S   1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot Fixed Frequency 8-Pole Low-Pass Filters Model D68L8L & DP68L8 D68L8D60 & DP68L8D60 D68L8D & DP68L8D D68L8D10 & DP68L8D10 Product Specifications Transfer Function Size Range fc    D68    DP68 8-Pole Bessel 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz 1 Hz to 5 kHz 8-Pole, 6 zero Constant Delay 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz 1 Hz to 5 kHz 8-Pole, 6 zero Constant Delay 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz 1 Hz to 5 kHz 8-Pole, 6 zero Constant Delay 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz 1 Hz to 5 kHz Theoretical Transfer Characteristics Click to view Click to view Click to view Click to view 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        ± 1% max. ± 0.01% /°c -3 dB -182° fc        ± 1% max. ± 0.01% /°c -3 dB -306° fc        ± 1% 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. 0 - fc ± 2° max. ± 1° typ. 0 - fc ± 2° max. ± 1° typ. 0 - fc ± 2° max. ± 1° typ. Amplitude Accuracy    (theoretical) 0 - fc ± 0.2 dB max. ± 0.1 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. 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    D68    DP 68 < - 100 dB typ. < - 80 dB typ. < - 100 dB typ. < - 80 dB typ. < - 100 dB typ. < - 80 dB typ. < - 100 dB typ. < - 80 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-01S FMA-01S FMA-01S FMA-01S   1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot Fixed Frequency 8-Pole High-Pass Filters Model D68H8B D68H8E D68H8EX D68H8EY Product Specifications Transfer Function Size Range fc, fr    D68    DP68 8-Pole Butterworth 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz Not Available 8-Pole, 6 zero Elliptic 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz Not Available 8-Pole, 6 zero Elliptic 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz Not Available 8-Pole, 6 zero Elliptic 1.8” x 0.8” x 0.3” 1 Hz to 100 kHz Not Available Theoretical Transfer Characteristics Click to view Click to view Click to view Click to view 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 80 dB 100 dB Cutoff Frequency Stability Amplitude Phase fc        ± 1% max. ± 0.01% /°c -3 dB -360° fr        ± 1% max. ± 0.01% /°c -0.035 dB -323.5° fr        ± 1% max. ± 0.01% /°c -0.05 dB -414° fr        ± 2% max. ± 0.01% /°c -0.05 dB -419° Filter Attenuation    (theoretical) 80.0 dB       0.31 fc 60.0 dB       0.42 fc 3.01 dB       1.00 fc 0.00 dB       2.00 fc 80.0 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 80.0 dB       0.64 fr 60.0 dB       0.69 fr 3.01 dB       0.95 fr 0.05 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. fr - 1.25 fr ± 4° max. ± 2° typ. 1.25 fr-100 kHz ± 2° max. ± 1° typ. fr - 1.25 fr ± 4° max. ± 2° typ. 1.25 fr-100 kHz ± 2° max. ± 1° typ. fr - 1.25 fr ± 4° max. ± 2° typ. 1.25 fr-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. 1.00 - 1.25 fr ± 0.3 dB max. ± 0.15 dB typ. 1.25 fr-100kHz ± 0.2 dB max. ± 0.1 dB typ. 1.00 - 1.25 fr ± 0.5 dB max. ± 0.25 dB typ. 1.25 fr-100kHz ± 0.2 dB max. ± 0.1 dB typ. 1.00 - 1.25 fr ± 0.5 dB max. ± 0.25 dB typ. 1.25 fr-100kHz ± 0.2 dB max. ± 0.1 dB typ. Total Harmonic Distortion @ 1 kHz    D68     < - 88 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 (20 Hz - 100 kHz) 100 µVrms typ. 100 µVrms typ. 150 µVrms typ. 150 µVrms typ. Filter Mounting Assembly FMA-01S FMA-01S FMA-01S FMA-01S   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 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., 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. 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 1.00 Hz to 100 kHz. Power Supply (+/-V) Rated Voltage: ± 15 Vdc Operating Range: ± 5 to ± 18 Vdc Maximum Safe Voltage: ± 18 Vdc Quiescent Current: D68: ± 25 mA typ., ± 40 mA max. DP68: ± 7 mA typ. ± 10 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.