824BP Series. 8 Bit Programmable 2-Pole Pair Filters. Band Pass
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- Osborne Gallagher
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1 824BP Series Band Pass 8 Bit Programmable 2-Pole Pair Filters 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 1,: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 1. Features/Benefits: Compact 2."L x 2."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 Specifications: Page Digital Tuning & Control Available Band-Pass Models: 824BP2 2 pole pair General Specifications: Ordering Information Pin-Out/package data
2 8-Bit Programmable Filters Digital Tuning Characteristics Pin-Out Key 824BP Series Digital Tuning & Control Characteristics The digital tuning interface circuits are a parallel set of eight (8) 453 CMOS switches which accept CMOS compatible inputs for the eight tuning bits (D - D 7 ). Filter tuning follows the tuning equation given below: fc = ( fmax/256 ) [ 1 + D 7 x D 6 x D 5 x D 4 x D 3 x D 2 x D 1 x D x 2 ] where D 1 - D 7 = "" or "1", and fmax = Maximum tuning frequency; fc = corner frequency; Minimum tunable frequency = fmax/256 (D thru D 7 = ); Minimum frequency step (Resolution) = fmax/256 Data Input Specifications Input Data Levels (CMOS Logic) Input Voltage (Vs = 15 Vdc) Low Level In Vdc min. 4 Vdc max. High Level In 11 Vdc min. 15 Vdc max. Input Current High Level In ma typ. -1 ma max.. Low Level In +1-5 ma typ. +1 ma max. Input Capacitance 5 pf typ 7.5 pf max. Input Data Format Positive Logic Bit Weighting D D 7 Frequency Range Frequency Select Bits Logic "1" = +Vs Logic "" = Gnd (Binary-Coded) LSB (least significant bit) MSB (most significant bit) 256 : 1, Binary Weighted IN Analog Input Signal D 7 Tuning Bit 7 (MSB) OUT Analog Output Signal D 6 Tuning Bit 6 GND Power and Signal Return D 5 Tuning Bit 5 +Vs Supply Voltage, Positive D 4 Tuning Bit 4 -Vs Supply Voltage, Negative D 3 Tuning Bit 3 Os Offset Adjustment D 2 Tuning Bit 2 D 1 Tuning Bit 1 D Tuning Bit (LSB) 2. OUT +Vs -Vs 4 IN Os Bottom View D7 D6 D5 D4 GND D3 D2 D1 D MSB LSB Bit Weight 2 7 D D D D D D D 1 2 D fc Corner Frequency fmax/256 1 fmax/ fmax/ fmax/ fmax/ fmax/ fmax/ fmax/ fmax 2
3 824BP Series Band-Pass 8-Bit Programmable 2-Pole Pair Filters Model Product Specifications 824BP2 Band-Pass Size Model 2 2." x 2." x.5" Model 3 & 4 2." x 2." x.4" Range f o 1 Hz to 25.6 khz Available "Q s" 1 1, 2, 5, 1 "Q" Accuracy ±1 % Theoretical Transfer Appendix A Characteristics Pages 39 & 4 Pass-Band Gain (non-inverting) Attenuation Rate ±.25 db typ ±.5 db max. 12 db/octave Center Frequency f o ±2% max. Stability Filter Mounting Assembly ±.1%/ C FMA-2A 1. Q Quality Factor for band-pass filters. Q = f O /(f H - ) f O = fhfl 3
4 824BP Series Specification (25 C and Vs ±15Vdc) Analog Input Characteristics 1 Impedance Voltage Range Max. Safe Voltage Analog Output Characteristics Impedance (Closed Loop) DC Offset Adjustment 2 k W (Cermet) ± Vs - Vs Do not connect if trim is not required. OS 1 k W min. ± 1 Vpeak ±Vs 11 W typ. 1 W max. Linear Operating Range ±1V Maximum Current 2 ±2 ma Offset Voltage 3 22 mv typ. 2 mv max. Offset Temp. Coeff. 5 mv/ C Power Supply (±V) Rated Voltage ±15 Vdc Operating Range ±12 to ±18 Vdc Maximum Safe Voltage ±18 Vdc Quiescent Current Temperature Operating Storage ±13 ma typ. ±2 ma max. -2 to +7 C -25 to +85 C 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. Adjustable to zero. 4. Units operate with or without offset pin connected Dia. Model Pin-Out and Package Data Ordering Information 2. OUT +Vs -Vs 4 IN Os 2. G-1 Side View Bottom View Ordering Information 824BP2/ min. D7 D6 D5 D4 GND D3 D2 D1 D G-3 Filter Mounting Assembly-See FMA-2A Q 1, 2, 5, 1 Pin-Out & Package Data All dimensions are in inches All Case Dimensions ±.2" Grid Dimensions.1" x.1" Model Number Tuning Range (Hz) Minimum Step(Hz) Case 2 1. to G to G to 25.6k 1 G-1 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-824BP-1 4
5 Product Handling Procedure Programmable Filter Modules Power Sequence & ESD Programmable Filters Modules 818, 824, 828, 828BP, 828BR, 854, 858, R854, R858 November 2 I. Scope The following precautions are necessary when handling and installing Frequency Devices programmable filter modules. II. Digital Circuit Description The digital input pins connect directly to 4 series CMOS logic, such as the 453 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. V minimum to 15. V maximum for a "1" (High) level and. V minimum to 4. V maximum for a "" (Low) level. Applying a voltage between 4. and 11. 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. III. (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 (>. V). Failure to do this will result in excessive current flowing through the digital input pin and through a protection diode internal to the 4 logic, which will result in damage to the module. The proper power-up and power-down sequence is: 1. Connect filter module ground. 2. Connect filter module +15 V. 3. Connect filter module -15 V. 4. Connect the input signal. All four of the above steps can also occur simultaneously. Power-down should occur in the reverse order. IV. 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: 1. Only a person wearing a properly grounded wrist strap should handle the modules. 2. Any work surface that the modules are placed on must be properly ESD grounded. 3. 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. 1
6 Band-Pass Appendix A Amp (db) Amplitude Response Curves Amp (db) Pole Pair Amp Q = 1 Q = 2 Q = 5 Q = 1 (db) f / fo f / fo f / fo f / fo f / fo f / fo f / fo f / fo sales@freqdev.com Web Address:
7 Band-Pass Appendix A 2-Pole Pair 18 Phase Response Curves 18 Phase (deg) 9-9 Phase (deg) Normalized Theoretical Phase Data Phase Q = 1 Q = 2 Q = 5 Q = 1 Mag (+) (-) (+) (-) (+) (-) (+) (-) (deg) f / fo f / fo f / fo f / fo f / fo f / fo f / fo f / fo inf inf inf inf 4 sales@freqdev.com Web Address:
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FEATURES. Timers Low Supply Detector. Power up Timer. Post Alarm Dead Time. Counter. Pulse Width Discriminator. Discriminator control function
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