D98 Series 1 Hz to 400 kHz* Low Noise Fixed Frequency 8- Pole Single Power Supply Anti-Aliasing Low-Pass Filters Description: The D98 Series of small 8-pole fixed-frequency, precision active filters provide high performance linear active filtering in a compact package, with a broad range of corner frequencies and a choice of Butterworth or Bessel transfer functions. These filters are designed to work with up to 16 Bit A/D converters. These fully self-contained units require no external components or adjustments. Applications • • • • • • • • • Each model comes factory tuned to a userspecified corner frequency between 1 Hz and 400 kHz* and operate with low total harmonic distortion over a wide dynamic input voltage range from non-critical single +5VDC to +18VDC power supply. Each filter has a built in internal +6VDC and -6VDC power supplies to power the filter. Features/Benefits: • Low harmonic distortion and wide signal– to–noise ratio to 16 bit resolution. • Available with Single or Differential inputs. • Available with DC coupled or AC coupled inputs. (The AC corner frequency is a single pole at 2 Hz.) • Compact 1.5"L x 2.0"W x 0.4"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. • Available in Butterworth or Bessel transfer functions to meet a wide range of applications. • Requires a single +5V to +18V power supply to operate (The module generates ± 6 VDC internally to operate the filter). • One to one offset input that works with your A/Ds reference output to set the output of the filter in the center of your A/Ds input range. • Available with built in gains from 0 dB to 60 dB. 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: D98L8B 8-Pole Butterworth D98L8L 8-Pole Bessel * Bessel 1 Hz to 200 Khz 1 1784 Chessie Lane, Ottawa, Illinois 61350 • Tel:800/252-7074, 815/434-7800 • FAX:815/434-8176 e-mail: [email protected] • Web Address: http://www.freqdev.com D98 Series 1 Hz to 400 kHz* Low Noise Fixed Frequency 8- Pole Single Power Supply Anti-Aliasing Low-Pass Filters Transfer Function D98L8B 8-Pole Butterworth D98L8L 8-Pole Bessel Size 1.5” x 2.0” x 0.4” 1.5” x 2.0” x 0.4” Range fc 1.0 Hz to 400 kHz 1.0 Hz to 200 kHz Theoretical Transfer Characteristics Passband Ripple (theoretical) Appendix A Page 9 Appendix A Page 4 0.0 dB 0.0 dB 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 36 dB/octave Cutoff Frequency Stability Amplitude Phase fc ± 1% max. ± 0.01%/°C -3 dB -360° fc ± 1% max. ± 0.01%/°C -3 dB -182° 0.12 dB 3.01 dB 60.0 dB 80.0 dB 1.91 dB 3.01 dB 60.0 dB 80.0 dB DC Voltage Gain (non-inverting) Filter Attenuation (theoretical) Amplitude Accuracy 0.80 fc 1.00 fc 2.37 fc 3.16 fc 0.80 fc 1.00 fc 4.52 fc 6.07 fc 0 – 0.8 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. 0.8 fc – 1.0 fc ±0.3 dB max. ±0.15 dB typ. (THD) Total Harmonic Distortion @ 1 kHz <-100 dB <-100 dB Wide Band Noise < 200 µVrms < 200 µVrms <-100 dB <-100 dB (theoretical) (5 Hz – 2 MHz) SINAD 2 1784 Chessie Lane, Ottawa, Illinois 61350 • Tel:800/252-7074, 815/434-7800 • FAX:815/434-8176 e-mail: [email protected] • Web Address: http://www.freqdev.com D98 Series Specifications Pin-Out and Package Data Ordering Information (25ºC and Vs + 5 VDC to + 18 VDC) Pin-Out and Package Data 1 Analog Input Characteristics Impedance 1 MΩ Voltage Range ±6 V peak Max. Safe Voltage ± 6V 0.1" GRID 2.00” Analog Output Characteristics Impedance 1 Ω typ., 10 Ω max. (Closed Loop) 3 ± 5V Linear Operating Range 2 ± 5 mA Maximum Current 3 ± 5 VDC Offset Voltage GND GND IN+V IN+ 1.50” Power Supply (±V) Rated Voltage Quiescent Current + 5 VDC to + 18 VDC ~110 mA Temperature Range Operating Storage 0ºC to +70ºC -25ºC to +85ºC OS Bottom View GND OUT+ OUT- 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. Any voltage applied to the offset pin appears at the output and an output offset. Note that if, for instance, the offset pin is at 2 VDC the maximum linear operating range will be ± 3V not ± 5 V. This is because you cannot exceed +5V or -5V linear operating range. Any voltage applied to the Offset Pin is low pass filtered to remove noise. 4. Units operate with or without offset pin connected. 5. How to specify Corner Frequency. Corner frequency is specified by attaching a three-digit frequency designator to the basic model number. Corner frequencies can range from 1.00 Hz to 400 kHz. 0.40” FRONT VIEW PINS 0.025" DIAMETER ORDERING INFORMATION Transfer Function B = Butterworth L = Bessel Input Type D = Differential S = Single Output Type D = Differential S = Single D98L8BDAS-100 Hz-10dB Gain 0 to 60dB Input Coupling A = AC Coupled Input D = DC Coupled Input - 3 dB Corner Frequency e.g., 100 Hz 10.0 kHz 75.2 kHz 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. 3 1784 Chessie Lane, Ottawa, Illinois 61350 • Tel:800/252-7074, 815/434-7800 • FAX:815/434-8176 e-mail: [email protected] • Web Address: http://www.freqdev.com Low-Pass 8-Pole Appendix A Butterworth Theoretical Transfer Characteristics 1 f/fc Amp Phase Delay (Hz) (dB) (deg) (sec) 0.00 0.00 0.00 .816 0.10 0.00 -29.4 .819 0.20 0.00 -59.0 .828 0.30 0.00 -89.1 .843 0.40 0.00 -120 .867 0.50 0.00 -152 .903 0.60 -0.001 -185 .956 0.70 -0.014 -221 1.04 0.80 -0.121 -261 1.19 0.85 -0.311 -283 1.29 0.90 -0.738 -307 1.40 0.95 -1.58 -333 1.48 1.00 -3.01 -360 1.46 1.10 -7.48 -408 1.17 1.20 -12.9 -445 .873 1.30 -18.2 -472 .672 1.40 -494 .540 -23.4 1.50 -511 .448 -28.2 1.60 -526 .380 -32.7 1.70 -539 .328 -36.9 1.80 -550 .287 -40.8 1.90 -44.6 -560 .253 2.00 -48.2 -568 .226 2.25 -56.3 -586 .174 2.50 -63.7 -600 .139 2.75 -70.3 -611 .113 3.00 -76.3 -621 .094 3.25 -81.9 -629 .080 3.50 -87.1 -635 .069 4.00 -96.3 -646 .052 5.00 -112 -661 .033 6.00 -125 -671 .023 7.00 -135 -678 .017 8.00 -144 -683 .013 9.00 -153 -687 .010 10.0 -160 -691 .008 Frequency Response Amp (dB) 0 -60 -100 0.1 Delay (sec) 2.0 2 3 4 5 6 78 1.0 2 3 4 5 67 Normalized Frequency(f/fc) 10.0 Delay (Normalized) 1.0 0.0 0.1 0.15 2 3 4 5 6 7 8 9 1.0 1.5 Normalized Time (1/f sec) Step Response (V/V) Step Response 1.2 1.0 0.8 0.6 0.4 0.2 -0.0 0 Normalized Delay Actual Corner Frequency (fc) in Hz -40 -80 1.Normalized Group Delay: The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc). Actual Delay = -20 9 1 2 3 4 Normalized Time (1/f sec) 1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176 e-mail: [email protected] Web Address: http://www.freqdev.com 5 8-Pole Bessel Appendix A Low-Pass Theoretical Transfer Characteristics 1 f/fc Amp Phase Delay (Hz) (dB) (deg) (sec) 0.00 0.00 0.00 .506 0.10 -0.029 -18.2 .506 0.20 -0.117 -36.4 .506 0.30 -0.264 -54.7 .506 0.40 -0.470 -72.9 .506 0.50 -0.737 -91.1 .506 0.60 -1.06 -109 .506 0.70 -1.45 -128 .506 0.80 -1.91 -146 .506 0.85 -2.16 -155 .506 0.90 -2.42 -164 .506 0.95 -2.71 -173 .506 1.00 -3.01 -182 .506 -3.67 1.10 -200 .506 -4.40 1.20 -219 .506 -5.20 1.30 -237 .506 1.40 -6.10 -255 .505 1.50 -7.08 -273 .504 1.60 -8.16 -291 .502 1.70 -9.36 -309 .498 1.80 -10.7 -327 .492 1.90 -12.1 -345 .482 2.00 -13.7 -362 .468 2.25 -18.1 -402 .417 2.50 -23.1 -436 .352 2.75 -28.3 -465 .291 3.00 -33.4 -489 .241 3.25 -38.3 -509 .201 3.50 -43.1 -526 .170 4.00 -51.8 -552 .126 5.00 -66.8 -587 .077 6.00 -79.2 -610 .052 7.00 -89.8 -626 .038 8.00 -99.0 -638 .029 9.00 -107 -647 .023 10.0 -114 -655 .018 Frequency Response Amp (dB) 0 -40 -60 -80 -100 0.1 2 3 4 5 6 78 1.0 2 3 4 5 6 7 10.0 Normalized Frequency(f/fc) Delay (Normalized) Delay (sec) 1.0 0.5 0.0 0.1 0.15 2 3 4 5 6 7 89 1.0 1.5 Normalized Time (1/f sec) Step Response (V/V) Step Response 1.Normalized Group Delay: The above delay data is normalized to a corner frequency of 1.0Hz.The actual delay is the normalized delay divided by the actual corner frequency (fc). Actual Delay = -20 Normalized Delay 1.2 1.0 0.8 0.6 0.4 0.2 -0.0 -0.2 0 1 2 3 4 Normalized Time (1/f sec) Actual Corner Frequency (fc) in Hz 4 1784 Chessie Lane, Ottawa, IL 61350 • Tel: 800/252-7074, 815/434-7800 • FAX: 815/434-8176 e-mail: [email protected] Web Address: http://www.freqdev.com 5