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| Adjustable Analog Highpass Filter GH580 - DATA SHEET FEATURES * 200 to 8 kHz adjustable corner frequency * 12 dB/oct Butterworth filter * low current drain (175 A typical) * two on chip 1 nF capacitors * low noise and distortion * 1.1 to 3.0 VDC operation DESCRIPTION The GH580 is a single, second order (12 dB/Oct) continuous high pass filter with an adjustable corner frequency (C) from 200 to 8 kHz. Adjustment of C is accomplished with a single 100 k potentiometer connected from pin 3 to ground. The bias circuitry is operated from an on chip voltage regulator providing good supply rejection down to 1.1 V. The two integrated 1 nF capacitors have parasitic diodes connected in parallel. This necessitates that the DC voltage at pin 6 be greater that 400 mV and less than VB and that pins 8 and 7 be no greater than approximately 400 mV DC. The GH580 has a dynamic range of approximately 80 dB. STANDARD PACKAGING * 8 pin PLID(R) * Chip (66 x 61 mils) VB 4 VREG 8 A IN + 1n + A _ 5 A OUT CP+ 6 + 1n CONTROL CP- 7 1 GND 3 RCNT BLOCK DIAGRAM Revision Date: January 2001 Document No. 520 - 50 - 05 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 Power Dissipation Operating Temperature Range Storage Temperature Range VALUE/UNITS 5 V DC 25 mW -10C to +40 C -20C to +70 C PIN CONNECTION VB RCNT NC GND 4 5 A OUT CP+ CP- 1 8 A IN CAUTION CLASS 1 ESD SENSITIVITY ELECTRICAL CHARACTERISTICS Conditions: Frequency = 1 kHz, Temperature = 25C, V = 1.3V B PARAMETER Amplifier Current Bias Voltage (Pin 6) Bias Voltage (Pin 8) Insertion Loss Output Noise SYMBOL IAMP VP6 VP8 ILOSS ONOISE CONDITIONS MIN 120 - TYP 175 100 350 1.7 5 MAX 210 2.0 7 UNITS A mV mV dB V SW1 to closed, VIN = 40 mVRMS SW1 to closed, VIN = 0 mVRMS NFB 200 Hz to 10 kHz at 12dB/oct - Distortion Supply Rejection (Pin 4 to Pin 5) Corner Frequency THD PSRR C SW1 to closed, VIN = 50 mVRMS Note 1, Pin 4 to Pin 5 Note 2, RCNT = 10.27k 48 1300 1 56 1650 5 1900 % dB Hz All parameters and switches remain as shown in Test Circuit unless otherwise stated in "Conditions" column Notes: 1. V modulated with 1kHz B 2. F C = 1000 x 2A ; A = (ILOSS - 20 LOG (V OUT /0.04))/12 VB=1.3VDC IAMP 4 VREG 8 SW1 + 1n0 + A _ 5 10 V OUT 6 + 1n0 7 1 VIN 1kHz All resistors in ohms, all capacitors in farads unless otherwise stated CONTROL RL=10K 1.8K 3 RCNT 100K Fig. 1 Test Circuit 520 - 50 - 05 2 4 1n 2 1 1.8K 5 All resistors in ohms, all capacitors in farads unless otherwise stated 7 1n 6 8 3 Fig. 2 Functional Schematic 1.3 VDC 4 RMIC 10 3 8 MIC VREG + 1n0 + _ A 5 01 10K 10 4 RP1 -B 33n 01 2 -A -C 6 + 1n0 7 5 RP2 10 EP 3075 CONTROL 1/ 1/ 2 GK504 RGT 1n5 100K 1 GH580 1k8 1 3 RCNT 100K 2 GK504 9 33n 8 7 6 RVC 100K RMPO 10K All resistors in ohms, all capacitors in farads unless otherwise stated Fig. 3 Typical Hearing Instrument Application 3 520 - 50 - 05 2 0 -2 16 14 12 10 8 6 4 2 0 20 200 2k 20k 10 20 30 40 50 60 70 80 RELATIVE OUTPUT (dB) -4 -8 -10 -12 -14 -16 -18 -20 THD (%) -6 FREQUENCY (Hz) INPUT (mVRMS) Fig. 4 Frequency Response at Various RCNT Values Fig. 5 Total Harmonic Distortion vs Input Level 10k 215 210 205 CORNER FREQUENCY (Hz) CURRENT DRAIN (A) 10 100 1k 10k 100k 200 195 190 185 180 175 1k 100 170 200 1k 8k CONTROL RESISTANCE () 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 November 1991 Gennum Corporation. All rights reserved. Printed in Canada. 520 - 50 - 05 4 |
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