Description The 824BP Series is a 2-pole-pair digitally programmable precision band-pass active filter that provides high performance in a compact 2" x 2" footprint. These new filters take advantage of the company’s proprietary designs using surface-mount technology to provide a low profile, compact package in minimal board space. 824BP filters are factory tuned to one of three factory set tuning ranges or 8-bit custom ranges from 1 Hz to 25.6 kHz. Each filter type features a near theoretical amplitude/phase response along with low output voltage noise enabling these filters to achieve a 10,000:1 or better dynamic signal range. Pretuned to within ±2% of the center frequency, band-pass 824BP filters pass all frequencies lying between the upper and lower -3dB points of the amplitude response curve. Available Q’s for 824BP models are 1, 2, 5, or 10. Features/Benefits: Compact 2.0"L x 2.0"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 center frequencies to meet a wide range of applications   Applications Power line interference rejection Transducer output filtering Production test instrumentation Medical electronics equipment and research Comb filtering and equalization Noise and harmonic analysis RMS measurements Frequency spectrum analysis   Programmable Tuning and Control Digital Tuning & Control Available Band-Pass Models 824BP2 2 Pole Pair 8-Bit Programmable Filters   824BP 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   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       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)       Band-Pass 824BP Series 8-Bit Programmable 2-Pole Pair Filters Model 824BP2 Product Specifications   Band-Pass Size Model 2         Model 3 & 4 Range fo Available "Q’s"1 Q Accuracy 2.0" x 2.0" x 0.5" 2.0" x 2.0" x 0.4" 1 Hz to 25.6 kHz 1, 2, 5, 10 ±10% Theoretical Transfer Characteristics Click to view     Pass-Band Gain    (non-inverting) 0± 0.25 dB typ. 0± 0.50 dB max. Attenuation Rate 12 dB/octave Center Frequency fo     ±2% max. Stability ±0.01%/°C Filter Mounting Assembly FMA-02A Notes 1: Q – Quality Factor for band-pass filters. Q = fo / (fH - fL) fo=sq.rt.(fH x fL) 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 Current(2): ± 2 mA Offset Voltage(3): 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 (+/-Vs) Rated Voltage: ± 15 Vdc Operating Range: ± 12 to ± 18 Vdc Maximum Safe Voltage: ± 18 Vdc Quiescent Current: ± 13 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-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.