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| Low Distortion AGC Compression Amplifier LD502 DATA SHEET FEATURES * adjustable gain from 0 to 60 dB * 0.94 V DC voltage regulator on-chip * attack time fixed at less than 1 ms * release time adjustable from 40 to 500 ms * low input referred noise 1.2 V * <1 % distortion at 10 mVRMS output * operates from 1.05 to 3 VDC STANDARD PACKAGING * 8 pin MICROpac * 8 pin MINIpac * 8 pin PLID (R) * 8 pin SLT * Chip (64 x 62 mils) Au Bump By using RGT (see test circuit) to vary the value of this current controlled resistance, the amplifier gain and compression threshold can be controlled over a range of 60 dB. The AGC current is derived from a full wave rectifier driven by a differential amplifier. The attack time of the AGC circuit is fixed at less than 1 ms. The release time is adjustable from 40 to 500 ms by selecting the value of an external capacitor (C3). Internally, a series shunt voltage regulator produces a 0.94 V DC regulated output voltage. This provides a bias for electret microphones and permits circuit operations over a wide range of supply voltages, 1.05 to 3 VDC for LD502 without any degradation of electrical performances. DESCRIPTION The LD502 is a compression (AGC) preamplifier that consists of a single ended input inverting amplifier, with an internal current controlled resistance connected between input and output. VB 7 GAIN SET 4 2 VREG VOLTAGE REGULATOR 1 A IN AMPLIFIER A OUT 3 FULL WAVE RECTIFIER AGC IN 6 8 GND 5 AGC FILTER BLOCK DIAGRAM Patented 1985 Canada 1183580 Patent Pending Europe 83.300836.0 USA 4506169 Japan 58-06886 Revision Date: March 1994 Document No. 500 - 43 - 18 GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 Japan Branch: A-302, M i yamae Vi l l age, 2-10-42 M i yamae, Suginami-ku, Tokyo 168, Japan tel. (905) 632-2996 fax: (905) 632-5946 tel. (03) 3334-7700 fax (03) 3247-8839 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range VALUE/UNITS 3 V DC 25 mW -10C to 50 C -20C to 70 C GAIN SET A OUT VREG A IN PIN CONNECTION 4 5 AGC FILTER AGC IN VB 1 8 GND CAUTION CLASS 1 ESD SENSITIVITY ELECTRICAL CHARACTERISTICS Conditions: Frequency = 1 kHz, Temperature = 25C, Supply Voltage V B = 1.3 VDC PARAMETER Gain SYMBOL AV CONDITIONS VOUT = 11.0 mV, 20 Log ( V OUT V IN ) MIN 38 TYP 41 MAX 46 UNITS dB Output Level Distortion -Linear - AGC Input Referred Noise Compression Function Ratio Total Amplifier Current Regulated Voltage Supply Rejection VOHIGH THD VIN = 6.32 mV, S1 closed VOUT = 11.0 mV VIN = 6.32mV, S1 closed 7.5 2 160 0.890 51 12 1 1 1.2 5 310 0.940 60 15.5 2.9 2.2 2.2 8 380 0.990 - mV % % V dB A VDC dB IRN S2 closed,NFB 0.2 to 10 kHz at 12 dB/Oct VIN = 0.1 to 6.32 mV, S1 closed I AMP VREG PSRR All parameters and switches remain as shown in Test Circuit unless otherwise stated in "Conditions" column ITOT RGT 130k VB= 1.3 VDC 7 4 2 VOLTAGE REGULATOR C5 1.0 RTH 0 VOUT C1 0.47 1 3 AMP RS= 3.5k FULL WAVE RECTIFIER 6 S1 RL 10K S2 RM 33K C2 1.0 VIN C4 0.1 8 5 C3 1.0 All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 1 Test Circuit 500 - 43 - 18 2 GAIN TRIM 4.7 500k 7 2 VB=1.3 VDC 4.7 4 LD502 4 1 4.7 0.1 VOLTAGE REGULATOR LC549 6 5 VC =10k 0.1 2 1 AMP 3 RL=400 TYP 8 RS 3.9k FULL WAVE RECTIFIER 6 8 5 0.1 3 7 NC 0.1-1.0 0.047 All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 2 LD502/LC549Hearing Instrument Application GAIN TRIM VB=1.3 VDC 500k 7 4.7 0.1 AMP 1 RS 3.9k FULL WAVE RECTIFIER 6 5 0.47 3 0.1 VC 10k 3 6 0.1 2 VOLTAGE REGULATOR 2 0.1 33k 5 2k 4 8 1 7 18k 13.5k LD502 4 LE507 25k BK1606 Z=1k 8 RE=33 All resistors in ohms, all capacitors in microfarads unless otherwise stated Fig. 3 LD502/LE507 Hearing Instrument Application 3 500 - 43 - 18 100 100 RTH =50k OUTPUT (mV) RTH=22k RTH=10k 10 RTH=0k 10 OUTPUT (mV) 1 RGT=130k RGT=82k RGT=68k RGT=47k 1 0.01 0.1 1.0 10 0.1 0.01 0.1 1.0 10 INPUT (mV) INPUT (mV) Fig. 4 I/O Characteristics at Various RTH Values Fig. 5 I/O Characteristics at Various RGT Values 100 4 2 0 CS=0.22 CS =0.1 RELATIVE OUTPUT (dB) RTH =0 -2 -4 -6 -8 -10 -12 -14 -16 -18 OUTPUT (mV) VB=3 VDC 10 VB=1.3 VDC CS=0.047 CS =0.033 0.1 0.01 0.1 1.0 10 -20 20 200 2K 20000 INPUT (mV) FREQUENCY (Hz) Fig. 6 Effects of Supply Voltage Variation Fig. 7 Frequency Response at Various CS Values 4.0 3.0 REVISION NOTES Changes to Fig.1, test conditions, Pb/Sn bump removed. THD (%) 2.0 DOCUMENT IDENTIFICATION PRODUCT PROPOSAL This data has been compiled for market investigation purposes only, and does not constitute an offer for sale. ADVANCE INFORMATION NOTE This product is in development phase and specifications are subject to change without notice. Gennum reserves the right to remove the product at any time. Listing the product does not constitute an offer for sale. PRELIMINARY DATA SHEET The product is in a preproduction phase and specifications are subject to change without notice. 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. 1.0 0.0 0.0 5.0 10.0 15.0 20.0 25.0 OUTPUT (mV) Fig. 8 Total Harmonic Distortion vs Output Level 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 January 1982 Gennum Corporation. All rights reserved. Printed in Canada. 500 - 43 - 18 4 |
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