DL Series Hz to khz Low Noise Fixed Frequency 4- and 8- Pole Low-Pass Filters Description: DL Series filters are low noise and distortion 4- and 8-pole, Butterworth or Bessel fixed frequency low-pass filters. These filters feature near theoretical low noise and distortion performance, by providing up to -2 db noise floors (2-Bit). DL s take advantage of FDI s design expertise utilizing high performance amplifiers and surface-mount technology to provide design engineers with precision signal conditioning solutions in a compact package. These fully self-contained units require no external components or adjustments. Each DL comes factory tuned to a user specified corner frequency between Hz to khz and operate with low harmonic distortion over an input voltage range to ± V. Features/Benefits: Small 32-pin DIP (.8"L x "W) footprint 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 corner frequencies to meet a wide range of applications. Available Low-Pass Models: Page DL4L 4-Pole Bessel 2 DL4B 4-Pole Butterworth 2 DL8L 8-Pole Bessel 2 DL8B 8-Pole Butterworth 2 General Specifications Pin-out/package data & order information 3 Applications Transducer output filtering: Production test instrumentation Medical electronics equipment and research Noise and harmonic analysis Frequency spectrum analysis e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
DL Series Hz to khz Low Noise Fixed Frequency 4- and 8- Pole Low-Pass Filters DL4B DL4L DL8B DL8L Product Specifications Transfer Function 4-Pole Butterworth 4-Pole Bessel 8-Pole Butterworth 8-Pole Bessel Size.8 x x.3.8 x x.3.8 x x.3.8 x x.3 Range f c Hz to khz Hz to khz Hz to khz Hz to khz Theoretical Transfer Characteristics Passband Ripple (theoretical) Page 7 Page 2 Page 9 db db db db Page 4 DC Voltage Gain (non-inverting) Stopband Attenuation Rate 24 db/octave 24 db/octave 48 db/octave 48 db/octave Cutoff Frequency f c ± % max. f c ± % max. f c ± % max. f c ± % max. Stability ± %/ C ± %/ C ± %/ C ± %/ C Amplitude -3 db -3 db -3 db -3 db Phase -8-2 -36-82 Filter Attenuation (theoretical) 7 db f c.86 db f c db f c.9 db f c 3. db f c 3. db f c 3. db f c 3. db f c 3 db 2.37 f c 3 db 3.5 f c 6 db 2.37 f c 6 db 4.52 f c 4 db 3.6 f c 4 db 4.72 f c 8 db 3.6 f c 8 db 6.7 f c Phase Match f c ± 2. max f c ± 2. max f c ± 2. max f c ± 2. max ± typ ± typ ± typ ± typ Amplitude Accuracy f c ± db max f c ± db max f c ± db max f c ± db max (theoretical) ±. db typ ±. db typ ±. db typ ±. db typ (THD) Total Harmonic Distortion @ Vp-p F C khz F C 2 khz F C khz <- db max. <- db max. <-5 db max. <-5 db max. Narrow Band Noise khz BW @ 2V p-p (µv rms) (µv rms) (µv rms) (µv rms) F C khz F C 2 khz 7. typ., 2 max. 7. typ., 2 max. 7. typ., 2 max. 7. typ., 2 max. 2 typ., 22 max. 2 typ., 22 max. 2 typ., 22 max. 2 typ., 22 max. F C khz 22 typ., 4 max. 22 typ., 4 max. 4 typ., 7 max. 4 typ., 7 max. Filter Mounting 2 FMA-S FMA-S FMA-S FMA-S Assembly. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot. 2. Use I/O jumpers to bypass input and output buffers, for low noise operation. With FMA, D distortion specs at 5k to khz may degrade slightly. 2 e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
DL Series Specifications (25ºC and Vs ± 5 Vdc) Pin-Out and Package Data Ordering Information Analog Input Characteristics Impedance kω min. Voltage Range ± V peak Max. Safe Voltage ± Vs Analog Output Characteristics Load impedance k Ω min. Linear Operating Range for THD ± 5V Operating Range for low Noise ± V Current 2 @ (Vs @ ±5V) ma max. Offset Voltage 3 2 mv typ. 2 mv max. Offset Temp. Coefficient 5 µv/ºc. Power Supply (±V S ) Rated Voltage ±5V Operating Range ±5V min. ±8V max. Quiescent Current DL4 4 ma max. DL8 8 ma max. Temperature Range Operating ºC to +7ºC Storage -25ºC to +85ºC ".7" " " " 25" (dia) "(typ).5" "(max) > khz.8"(max) > khz Bottom View 5".55".3"(max).5" (min) OUT +VS -VS OS GND < khz < khz All dimensions are in inches All case dimensions ± " 5 5 6 29 IN.55".65".5"(max) 7.8" DC Offset Adjustment +Vs ORDERING INFORMATION 2 k (Cermet) Do not connect if trim is not required. 4 Os Filter type L = Low Pass Transfer Function B= Butterworth L = Bessel DL4B- khz -Vs Notes:. Input and output signal voltage referenced to supply common. 2. Output is short circuit protected to common. DO NOT CONNECT TO ±Vs. 3. Adjustable to zero. 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 Hz to khz. # Poles - 3 db Corner Frequency 5 4 or 8 e.g., 849 Hz 2.5 khz 33.3 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. PR-DL 3 e-mail: sales@freqdev.com Web Address: http://www.freqdev.com
Low-Pass 4-Pole Bessel.336-28 -2..336 -. -24.2.336.3-5 -36.3.336-48 -48.4.336.5 -.75-6.336-2 -72.7.336.7 -.4-84.8.336 -.86-96.8.335 5-2. -3.334.9-2.4-9.333.95-2.69-5.332-3. -2.33. -3.7-33.325.2-4.5-44.38.3-5.39-56.38.4-6.37-66.295.5-7.42-77.28.6-8.54-87.263.7-9.7-95.246.8 -.9-24.228.9-2.2-22.2 2. -3.4-29.94 2.25-6.5-235.58 2.5-9.5-248.29 2.75-22.4-259.7 3. -25. -267.89 3.25-27.6-275.76 3.5-3 -28.65 4. -34.4-29.49 5. -4.9-35.3 6. -48. -35.2 7. -53.4-32.6 8. -58. -326.2 9. -62. -33.9-65.7-333.8.Normalized Group Delay: of Hz.The actual delay is the normalized delay divided -. 8 2 (V/V) -2-4 -6-8.5.5 8 9..2.5 - - 2 3 4 5
8-Pole Bessel Low-Pass.56-29 -8.2.56 -.7-36.4.56.3-64 -54.7.56-7 -72.9.56.5 -.737-9..56-6 -9.56.7 -.45-28.56 -.9-46.56 5-2.6-55.56.9-2.42-64.56.95-2.7-73.56-3. -82.56. -3.67-2.56.2-4.4-29.56.3-5.2-237.56.4-6. -255.55.5-7.8-273.54.6-8.6-29.52.7-9.36-39.498.8 -.7-327.492.9-2. -345.482 2. -3.7-362.468 2.25-8. -42.47 2.5-23. -436.352 2.75-28.3-465.29 3. -33.4-489.24 3.25-38.3-59.2 3.5-43. -526.7 4. -5.8-552.26 5. -66.8-587.77 6. -79.2-6.52 7. -89.8-626.38 8. -99. -638.29 9. -7-647.23-4 -655.8.Normalized Group Delay: of Hz.The actual delay is the normalized delay divided - - 2 3 4 5 4 (V/V) -2-4 -6-8 -. 8.5.5 8 9..2.5
Low-Pass 4-Pole Butterworth.46-5..48-3..423.3 - -45.5.433-3 -6.4.449.5-7 -78..474-72 -95.7.5.7-43 -5.558-74 -36.64 5-47 -47.69.9 -.555-58.622.95-2.2-69.62-3. -8.588. -4.97-2.53.2-7.24-27.427.3-9.62-23.35.4-2. -242.289.5-4.3-252.24.6-6.4-26.24.7-8.5-266.75.8-2.5-272.52.9-22.3-277.34 2. -24. -282.9 2.25-28.2-29.9 2.5-3.8-299.72 2.75-35. -34.59 3. -38.2-39.49 3.25-4 -33.4 3.5-43.5-37.35 4. -48.2-322.27 5. -55.9-33.7 6. -62.3-335.2 7. -67.6-339.9 8. -72.2-34.7 9. -76.3-343.5-8 -345.4.Normalized Group Delay: of Hz.The actual delay is the normalized delay divided -. 8 7 (V/V) -2-4 -6-8 2..5 8 9.5..2-2 3 4 5
Low-Pass 8-Pole Butterworth.86-29.4.89-59..828.3-89..843-2.867.5-52.93 - -85.956.7-4 -22 4 - -26.9 5 -.3-283.29.9 -.738-37.4.95 -.58-333.48-3. -36.46. -7.48-48.7.2-2.9-445.873.3-8.2-472.672.4-23.4-494.54.5-28.2-5.448.6-32.7-526.38.7-36.9-539.328.8-4 -55.287.9-44.6-56.253 2. -48.2-568.226 2.25-56.3-586.74 2.5-63.7-6.39 2.75-7.3-6.3 3. -76.3-62.94 3.25-8.9-629.8 3.5-87. -635.69 4. -96.3-646.52 5. -2-66.33 6. -25-67.23 7. -35-678.7 8. -44-683.3 9. -53-687. -6-69.8.Normalized Group Delay: of Hz.The actual delay is the normalized delay divided -. 8 9 (V/V) -2-4 -6-8 2...5 8 9.2 -.5 2 3 4 5