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| Dual, Continuous, Analog Highpass Filter LF580 DATA SHEET FEATURES * only 2 small capacitors required * 200 to 10 kHz adjustable corner frequency * dual 12 dB/Oct Butterworth filter (24 dB/Oct cascaded) * 1.1 to 3.0 VDC operating range * adjustable by a single potentiometer DESCRIPTION The LF580 continuous analog filter consists of two second order (12 dB/oct), tunable (0.2 to 10 kHz) highpass Butterworth filter blocks. Tracking and corner frequency of each block are controlled by a single potentiometer. Cascading the two blocks together results in a single 24dB/oct high pass filter requiring only two external 0.001 F capacitors for the filter response. The output noise of each filter stage is typically 5.6V. Cascading the two filter blocks together will produce a noise level which is VN = (V N1) 2 + (VN2)2 Where VN is the total output noise of both filters, VN1 and VN2 is the noise of each filter. To improve the signal-to-noise ratio of the filter the LF580 should be placed after a preamplifier, provided that the signal level does not exceed the maximum signal capability of 50mVRMS STANDARD PACKAGING * 8 pin MICROpac * 8 pin PLID (R) * Chip (66 x 61mils) VB 4 8 AIN 0.001 + A _ 0.001 + _ B 5 BOUT CONTROL 1.8k 7 6 3 1 AOUT BIN CONTROL GND All resistors in ohms, all capacitors in microfarads unless otherwise stated BLOCK DIAGRAM Revision Date: January 2001 Document No. 500 - 73 - 08 GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996 Web Site: www.gennum.com E-mail: hipinfo@gennum.com ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Operating Temperature Range Storage Temperature Range VALUE/UNITS 5 V DC -10C to 50 C -40C to 100 C V B PIN CONNECTION TOP VIEW 4 5 B B A 1 8 A OUT IN OUT IN CONTROL N/C GND CAUTION CLASS 1 ESD SENSITIVITY ELECTRICAL CHARACTERISTICS Conditions: Frequency = 1 kHz, Temperature = 25C, Supply Voltage VB = 1.3 V Parameter Insertion Loss Current Drain Corner Frequency Distortion Ouput Noise Supply Rejection Symbol Conditions VIN =1 VRMS Note 1 Min 200 Typ 2 280 Max 3 370 1900 5 10 56 Units dB A Hz % V dB IT fC THD RCNT = 100 k VIN =1 VRMS VIN =1.25 VRMS Note 3 Note 2 1300 1650 2 8 45 SR VB = 3.0VDC Note 4 All parameters and switches remain as shown in Test Circuit unless otherwise stated in "Conditions" column Notes 1: Insertion Loss = 20 Log(VOUT/VIN)-12 2: a) measure output voltage VOUT1 (RCNT =100k) b) measure output voltage VOUT2 (R CNT =10.274k) fC = 1000 x 2 (VOUT1 / VOUT2) 3: Output Noise = VOUT /100, filter bandwidth 200Hz to 10kHz at 12dB/Oct 4: VB modulated with 1VRMS at 1 kHz Supply Rejection = 20 Log (VOUT)-40 0.001 RB=4.7 VB=1.3 VDC +15 VDC 7 1.82k 150 0.001 6 LF580 3 4 1.0 8 ATTENUATOR 28dB 5 1 + IC1 40.0 dB _ -15 VDC VOUT 82.1 VIN 100k RL=10k RCNT=100k 1000 10 All resistors in ohms, all capacitors in microfarads unless otherwise stated in conditions column Fig. 1 Test Circuit 500 - 73 - 08 2 4 0.001 0.001 2 1 1.8k 7 5 8 6 3 All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 2 Functional Schematic 1.3 VDC 1/ GL504 2 6 4 1/ GL504 2 7 1.0 RMIC 0.001 8 0.001 + _ A 0.001 + _ B 5 0.1 3 RPULL -B 8 0.033 EP3075 1.0 0.22 5 -A RCLIP CONTROL 47k 1.8k 4 LF580 7 6 3 1 1 2 0.001 100k 1.5nF RVC RCNT 10k RMPO 10k All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 3 GL504-LF580 Application Circuit 3 500 - 73 - 08 2 1 0 RCNT=100K RCNT=10K RCNT=1K 24 22 20 18 16 RELATIVE OUTPUT (dB) -1 -2 THD (%) 1K 10K 100K -3 -4 -5 -6 -7 -8 -9 -10 100 14 12 10 8 6 4 2 0 10 20 30 40 50 60 70 80 90 100 FREQUENCY (Hz) INPUT (mVDC) Fig. 4 Frequency Response at Various RCNT Values Fig. 5 Total Harmonic Distortion vs Input Level (measured at Pin 7) 20K 10K 400 380 CORNER FREQUENCY (Hz) CURRENT DRAIN (A) 360 340 320 300 280 1K 100 10 100 1K 10K 100K 260 100 10000 CONTROL RESISTANCE RCNT () CORNER FREQUENCY (Hz) Fig. 6 Corner Frequency vs Control Resistance Fig. 7 Current Drain vs Corner Frequency GENNUM CORPORATION MAILING ADDRESS: P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 Tel. +1 (905) 632-2996 Fax +1 (905) 632-2814 SHIPPING ADDRESS: 970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5 DOCUMENT IDENTIFICATION: DATA SHEET The product is in production. Gennum reserves the right to make changes at any time to improve reliability, function or design, in order to provide the best product possible. REVISION NOTES: Changes to standard packaging information GENNUM JAPAN CORPORATION C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081, Japan Tel. +81 (3) 3334-7700 Fax: +81 (3) 3247-8839 Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. (c) Copyright October 1987 Gennum Corporation. All rights reserved. Printed in Canada. 500 - 73 - 08 4 |
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