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| ZXF103 VARIABLE Q FILTER DESCRIPTION The ZXF103 is a versatile analog high Q bandpass filter. It can be configured to provide pass or notch characteristics. The basic filter section requires 2 resistors and 2 capacitors to set the centre frequency. The frequency range is up to 600kHz. Two external resistors control filter Q Factor. The Q can be varied up to 50. APPLICATIONS Many filter applications including: - FEATURES AND BENEFITS * Centre Frequency up to 1MHz * Variable Q up to 50 * Low distortion * Low noise * Low power 25mW * Devices easily cascaded * Small QSOP16 package * Sonar and Ultrasonic Systems * Line frequency notch * Signalling * Motion detection * Instrumentation * Low frequency telemetry ORDERING INFORMATION PART NUMBER ZXF103Q16 PACKAGE QSOP16 PART MARK ZXF103 PART NUMBER ZXF103Q16TA ZXF103Q16TC CONTAINER Reel 7" 178mm Reel 13" 330mm INCREMENT 500 2500 SYSTEM DIAGRAM R C R C Filter Input ZXF103 Filter Output PINOUT 1 R2 0V RC2 BIAS RC1 0V C1 FI1 16 GP1 Vcc GP3 GP2 NC Vcc FO FI2 R Q SET ISSUE 1 - APRIL 2002 1 ZXF103 ABSOLUTE MAXIMUM RATINGS Voltage on any pin Operating temperature range Storage temperature 7.0V (relative to 0V) 0 to 70C -55 to 125C ELECTRICAL CHARACTERISTICS Test Coditions: Temperature =25C, VCC = 5.00V, 0V =0.00V, RL=10k,CL=10pF GENERAL CHARACTERISTICS Parameter Operating current Max. operating frequency Q usable range Centre Frequency temperature coefficient Q temperature coefficient Voltage noise Input impedance Linear Output Range Sink current Source current Pin 1 2 3 Name R2 0V RC2 BIAS RC1 0V C1 FI1 FI2 FO Vcc N/C GP2 GP3 Vcc GP1 Output load =10 k Q=30, Q=30, fo = 1kHz fo = 1kHz Vout=1.6V p-p Vout=1.0V p-p 0.5 100 0.1 20 10 15 2 450 450 Function Phase retard node 0 Volts Phase retard node Internal bias generator Phase advance node 0 Volts Phase advance node Filter input mode dependent Filter input, mode dependent Filter output for all modes +5 Volt supply No connection Loop gain node Loop gain node +5 Volt supply Loop gain node 20 Conditions Min. Typical 4.0 Max. 5.0 600 1000 50 Units mA kHz ppm/C % /C nV/ Hz k V pk-pk A A 1 - 100 kHz Histogram of Centre Frequency (Fo = 11.80KHz Q = 25) 4 5 6 7 Number of Devices 8 9 10 11 12 11.78 11.79 11.80 11.81 11.82 13 14 15 16 Frequency (KHz) ISSUE 1 - APRIL 2002 2 ZXF103 Filter Configurations and Responses Notch Filter AC Filter Performance 0 -8 Fo = 1 2 RC Gain (dB) -16 where R=R1=R2 and C=C1=C2 Q R4 R3 2k -24 -32 where R1,R2,R3 and R4 and C1 and C2 50pF 100K 1M 10M -40 10K Frequency (Hz) 270 See "Designing for a value of Q" for more details. 225 Phase (deg) 180 135 90 45 10K 100K 1M 10M Frequency (Hz) ISSUE 1 - APRIL 2002 3 ZXF103 Filter Configurations and Responses (Continued) Inverse Notch Filter (with 0dB Stop Band) AC Filter Performance 30 24 Fo = 1 2 RC Gain (dB) 18 where R=R1=R2 and C=C1=C2 Q R4 R3 2k 12 6 where R1,R2,R3 and R4 and C1 and C2 50pF 100K 1M 10M 0 10K Frequency (Hz) -45 -90 -135 -180 -225 -270 10K 100K 1M 10M Frequency (Hz) ISSUE 1 - APRIL 2002 4 ZXF103 Filter Configurations and Responses (Continued) Inverse Notch Filter (with attenuating skirts) AC Filter Performance 30 20 Fo = 1 2 RC Gain (dB) 10 where R=R1=R2 and C=C1=C2 Q R4 R3 2k 0 -10 -20 10K 100K 1M 10M where R1,R2,R3 and R4 and C1 and C2 50pF Frequency (Hz) -90 See "Designing for a value of Q" for more details. The skirt `roll off' away from the peak is -20dB/Decade regardless of chosed Q. Typical responses from the circuit with component values derived from the diagram. -180 Phase (deg) -270 -360 -450 -540 10K 100K 1M 10M Frequency (Hz) ISSUE 1 - APRIL 2002 5 ZXF103 Designing for a value of Q As mentioned on the configuration pages, there is a proportional relationship between the ratio of R4 and R3, and Q. Q R4 R3 Frequency dependant effects must be accounted for in determining the appropriate gain. As the frequency increases, the effective circuit gain reduces. The required gain is nominally two but at higher frequencies it will need to be slightly greater than two in order to compensate for loss of gain and internal phase shifts. This is not really a problem for circuits where the desired Fo remains constant, as the phase shifts are accounted for permanently. For designs where Q is high and Fo is to be `swept', care must be taken that a gain appropriate at the highest frequency does not cause oscillation at the lowest. Variation in Q increases from device to device, as the value of Q increases, due to internal gain spreads. These resistors define the gain of an inverting amplifier that determines the peak value of gain and therefore the Q of the filter, as Q is described as; Fo Q= -3dBBandwidth This value of required gain is quite critical. As the maximum value of Q is approached, too much gain will cause the filter to oscillate at the centre frequency Fo. A small reduction of gain will cause the value of Q to fall significantly. Therefore, for high values of Q factor or tight tolerances of lower values of Q, the resistor ratio must be trimmed. ISSUE 1 - APRIL 2002 6 ZXF103 Evaluation Board Schematic 0v C3 100 nF C4 5v 100 nF 6.8 k 1 R2 0v RC2 Bias RC1 0v C1 FI 1 GP1 Vcc GP3 GP2 N/C Vcc FO FI 2 C2 330 pF R2 R3 10 k VR1 2 k R4 22 k C5 Output 100 nF J1 J2 J3 R1 6.8k C1 330 pF ZXF103 C6 Input 100 nF The evaluation board is designed for operation at 70kHz. Notch Notch Pass 1 Notch Pass 2 J1 and J2 J2 and J3 (0dB Stop Band) J3 only (Attenuating skirts) ISSUE 1 - APRIL 2002 7 ZXF103 ISSUE 1 - APRIL 2002 8 ZXF103 QSOP16 DIM Millimetres MIN A B C D E F G J K 4.80 0.635 0.23 REF 0.20 3.81 1.35 0.10 5.79 0 0.30 3.99 1.75 0.25 6.20 8 MAX 4.98 Inches MIN 0.189 0.025 NOM 0.009 REF 0.008 0.15 0.053 0.004 0.228 0 0.012 0.157 0.069 0.01 0.244 8 MAX 0.196 Conforms to JEDEC MO-137AB Iss A (c) Zetex plc 2001 Zetex plc Fields New Road Chadderton Oldham, OL9 8NP United Kingdom Telephone (44) 161 622 4422 Fax: (44) 161 622 4420 Zetex GmbH Streitfeldstrae 19 D-81673 Munchen Germany Telefon: (49) 89 45 49 49 0 Fax: (49) 89 45 49 49 49 Zetex Inc Suite 315 700 Veterans Memorial Highway Hauppauge NY11788 USA Telephone: (631) 360 2222 Fax: (631) 360 8222 Zetex (Asia) Ltd 3701-04 Metroplaza, Tower 1 Hing Fong Road Kwai Fong, Hong Kong China Telephone: (852) 26100 611 Fax: (852) 24250 494 These offices are supported by agents and distributors in major countries world-wide. This publication is issued to provide outline information only which (unless agreed by the Company in writing) may not be used, applied or reproduced for any purpose or form part of any order or contract or be regarded as a representation relating to the products or services concerned. The Company reserves the right to alter without notice the specification, design, price or conditions of supply of any product or service. For the latest product information, log on to www.zetex.com ISSUE 1 - APRIL 2002 9 |
Price & Availability of ZXF103
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