Description The D824 Series are digitally programmable low pass and high pass active filters with differential input that are tunable over a 256:1 frequency range. D824 filters are available with any one of five standard factory-set tuning ranges up to 102.4 kHz. These units contain 8 CMOS logic inputs . All D824 Series models are convenient, low profile, easy to use fully finished filters which require no ex-ternal components or adjustments. They feature low harmonic distortion, and near theoretical phase and amplitude characteristics. D824 filters operate from non-critical ± 12 to ± 18 Vdc power supplies, have a 10 kΩ (min.) input impedance, a 10 Ω (max.) output. Features/Benefits: Compact 2" x 2" design 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-set tuning range, 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 Low-Pass Models: D824L8B 4-pole Butterworth D824L8L 4-pole Bessel D824L8Y2 4-pole Cheby (0.2 dB Ripple) D824L8Y5 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 Sound and vibration testing Real and compressed time data analysis Noise elimination Signal reconstruction   Available 824 High-Pass Models: D824H8B 4-pole Butterworth D824H8Y2 4-pole Cheby (0.2 dB Ripple) D824H8Y5 4-pole Cheby (0.5 dB Ripple) 8-Bit Programmable Filters   D824 Series Digital Tuning & Control Characteristics Digital Tuning Characteristics The digital tuning interface circuits are a parallel set of eight (8) 4053 CMOS switches which accept CMOS compatible inputs for the eight tuning bits (D0 - D7 ). Filter tuning follows the tuning equation given below: fc = ( fmax/256 ) [ 1 + D7 x 27 + D6 x 26 + D5 x 25 + D4 x 24 + D3 x 23 + D2 x 22 + D1 x 21 + D0 x 20] where D1 - D7 = "0" or "1", and fmax = Maximum tuning frequency; fc = corner frequency; Minimum tunable frequency = fmax/256 (D0 thru D7 = 0); Minimum frequency step (Resolution) = fmax/256   MSB --- --- --- --- --- --- LSB Bit Weight 27 D7 26 D6 25 D5 24 D4 23 D3 22 D2 21 D1 20 D0 fc Corner Frequency 0 0 0 0 0 0 0 0 fmax/256 0 0 0 0 0 0 0 1 fmax/128 0 0 0 0 0 0 1 1 fmax/64 0 0 0 0 0 1 1 1 fmax/32 0 0 0 0 1 1 1 1 fmax/16 0 0 0 1 1 1 1 1 fmax/8 0 0 1 1 1 1 1 1 fmax/4 0 1 1 1 1 1 1 1 fmax/2 1 1 1 1 1 1 1 1 fmax   Pin-Out Key IN Analog Input Signal   D7 Tuning Bit 7 (MSB) OUT Analog Output Signal   D6 Tuning Bit 6 GND Power and Signal Return   D5 Tuning Bit 5 +Vs Supply Voltage, Positive   D4 Tuning Bit 4 -Vs Supply Voltage, Negative   D3 Tuning Bit 3 Os Offset Adjustment   D2 Tuning Bit 2       D1 Tuning Bit 1       D0 Tuning Bit 0 (LSB)   Data Input Specifications Input Data Levels   (CMOS Logic) Input Voltage (Vs=15 Vdc ) Low Level In   0 Vdc min.   4 Vdc max. High Level In   11 Vdc min.   15 Vdc max. Input Current         High Level In   -10-5 µA typ.   -1 µA max. Low Level In   +10-5 µA typ.   +1 µA max. Input Capacitance   5 pF typ   7.5 pF max. Input Data Format   Frequency Select Bits Positive Logic   Logic "1" = +Vs     Logic "0" = Gnd Bit Weight   (Binary-Coded)   D0   LSB (least significant bit)   D7   MSB (most significant bit) Frequency Range   256 : 1, Binary Weighted   8-Bit Programmable D824 Series                  4-Pole Low-Pass Filters Model D824L8B D824L8L D824L8Y2 D824L8Y5 Product Specifications Transfer Function Size, Model 2    Model 3 thru 6 Range fc 4-Pole Butterworth 2.0” x 2.0” x 0.5” 2.0” x 2.0” x 0.4” 1.0 Hz to 102.4 kHz 4-Pole, Bessel 2.0” x 2.0” x 0.5” 2.0” x 2.0” x 0.4” 1.0 Hz to 102.4 kHz 4-Pole, Chebychev, 0.2 dB Ripple 2.0” x 2.0” x 0.5” 2.0” x 2.0” x 0.4” 1.0 Hz to 102.4 kHz 4-Pole, Chebychev, 0.5 dB Ripple 2.0” x 2.0” x 0.5” 2.0” x 2.0” x 0.4” 1.0 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/octave 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 ± 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. 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.   1. Unit to unit match for the same transfer function, set to the same frequency and operating configuration, and from the same manufacturing lot.   8-Bit Programmable D824 Series                  4-Pole High-Pass Filters     Model D824H8B D824HY2 D824H8Y5 Product Specifications Transfer Function Size, Model 2    Model 3 thru 6 Range fc 4-Pole Butterworth 2.0” x 2.0” x 0.5” 2.0” x 2.0” x 0.4” 1.0 Hz to 102.4 kHz 4-Pole,Chebychev, 0.2 dB Ripple 2.0” x 2.0” x 0.5” 2.0” x 2.0” x 0.4” 1.0 Hz to 102.4 kHz 4-Pole, Chebychev, 0.5 dB Ripple 2.0” x 2.0” x 0.5” 2.0” x 2.0” x 0.4” 1.0 Hz to 102.4 kHz 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 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 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 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) 40.0 dB       0.31 fc 30.0 dB       0.42 fc 3.01 dB       1.00 fc 0.02 dB       2.00 fc 40.0 dB       0.41 fc 30.0 dB       0.53 fc 3.01 dB       1.00 fc -0.07 dB      2.00 fc 40.0 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.   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 Pin-Out and Package Data Bottom View Filter Mounting Assembly-See FMA-02A Ordering Information Power Sequence & ESD Programmable Filters Modules 818, 824, 828, 828BP, 828BR, 854, 858, R854, R858, 824BP, D824, D828 Scope The following precautions are necessary when handling and installing Frequency Devices programmable filter modules. Digital Circuit Description The digital input pins connect directly to 4000 series CMOS logic, such as the 4053 analog switch. The power supply (Vss) for the digital logic on the module comes directly from the +15 Volt pin on the module. This sets the threshold voltage at 11.0 V minimum to 15.0 V maximum for a "1" (High) level and 0.0 V minimum to 4.0 V maximum for a "0" (Low) level. Applying a voltage between 4.0 and 11.0 V will produce unpredictable operation. Connecting 5 Volt or 3.3 V logic devices directly to the filter module without using a voltage translator will result in erratic operation of the filter. (VERY IMPORTANT) Power-Up and Power-Down Sequence Do not plug-in or un-plug module while power is applied. It is imperative that power is supplied to the + 15 V pin on the filter module before or at the same instance that any digital pin is pulled High (> 0.0 V). Failure to do this will result in excessive current flowing through the digital input pin and through a protection diode internal to the 4000 logic, which will result in damage to the module. The proper power-up and power-down sequence is: Connect filter module ground. Connect filter module +15 V. Connect filter module -15 V. Connect the input signal. All four of the above steps can also occur simultaneously. Power-down should occur in the reverse order. ESD Issues Like most modern electronic equipment, the modules can be damaged by electrostatic discharge (ESD). The modules are shipped from the factory in sealed, anti-static packaging and should be kept in the sealed package prior to mounting on a circuit board. The following additional rules should also be observed when handling the modules after they are removed from the factory packaging: Only a person wearing a properly grounded wrist strap should handle the modules. Any work surface that the modules are placed on must be properly ESD grounded. Any insulating materials capable of generating static charge (such as paper) should be kept away from the modules. Static generating clothing should be covered with an ESD-protective smock. 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.