Low Parts Compression Amplifier GB512/LD512 DATA SHEET DESCRIPTION FEATURES The GB512 and LD512 are 8 pin stand-alone input compression amplifiers requiring minimal external parts. Each consists of a voltage regulator for the electret microphone providing a high power supply rejection ratio (PSRR), a compression stage which has a 2:1 compression ratio, and an auto-biasing, class A, voltage drive output stage. • 44 dB typical preamplifier gain • 14 dB typical output stage gain • compression function ratio 1:1 to 2:1 to ∞:1 • automatic setting of transducer current • greater than 40 dB volume control range The auto-bias output stage can drive a variety of impedances ranging from 500 Ω to 5 kΩ without adding any external resistors to set the bias. STANDARD PACKAGING The GB512 and LD512 are recommended for low to medium gain/output ITE and ITC type hearing aids. • 8 pin PLID The GB512 is tested to tighter test limits. • operation down to 1.1 VDC • 8 pin SLT (LD512) • Chip (61 x 61 mils) Au Bump VB 5 VREG 4 28 dB A IN 3 200 mV REF VREG -A 16 dB + C _ - B 7 C OUT CONTROL 2 6 CAGC GND 1 8 B OUT C IN BLOCK DIAGRAM Revision Date: January 2001 Document No. 500 - 75 - 08 GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3 tel. (905) 632-2996 fax: (905) 632-5946 Japan Branch: A-302, Miyamae Village, 2-10-42, Miyamae, Suginami-ku, Tokyo 168, Japan tel. (03) 3334-7700 fax (03) 3247-8839 PIN CONNECTION ABSOLUTE MAXIMUM RATINGS PARAMETER VALUE/UNITS 5 V DC VREG 25mW A IN -10°C to 40°C CAGC -20˚C to 70˚C B OUT Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range 5 4 VB GND C OUT 1 C IN 8 CAUTION CLASS 1 ESD SENSITIVITY ELECTRICAL CHARACTERISTICS Conditions : Temperature 25˚C, Frequency 1 kHz, Supply Voltage 1.3 VDC. PARAMETER SYMBOL GB512 CONDITIONS LD512 MIN TYP MAX MIN TYP MAX 200 290 110 200 290 UNITS µA Amplifier Current IAMP 110 Regulator Voltage VREG 0.88 0.93 0.98 0.88 0.93 0.98 VDC Output Level VO1 VIN = -88 dBV -47 -44 -41 -48 -44 -40 dBV Output Level VO2 VIN = -74 dBV VO1 + 7 VO1 + 9 VO1 + 11 - - - dB Output Level VO3 VIN = -54 dBV VO2 + 8 VO2+10 VO2+10 VO2+13 dB Output Level VO4 VIN = -40 dBV Input Referred Noise IRN Total Harmonic Distortion VO2+12 VO2 + 7 -23 -20 -18 -23.5 -20 -17.5 dBV NFB 0.2-10kHz at 12dB/oct - 1 3 - 1 3 µVRMS THD VIN = -54 dBV - 2 4 - 2 4 % Receiver Bias Voltage VBIAS Note 3 100 200 300 160 200 240 mVDC Current Sinking Capability ISINK Note 4 3 8 - 3 8 - mA Release Time Factor TREL - 100 - - 100 - ms/µF Attack Time Factor TATT - 5 - - 5 - ms/µF All parameters and switches remain as shown in the Test Circuit unless stated in CONDITIONS column. VPX - actual voltage measured on the pin at given condition (X is pin number). VO4 Notes: 1. VO and Distortion measurements are taken at pin 1. VO3 2. Output stage gain = 20 log (RF / RS). O/P LEVEL VO2 (dBV) at PIN 1 A gain of 14 dB is recommended for optimal stability. Stability is dependent upon the ratio of the receiver impedance VO1 (Z L) and the battery impedance to RF & RS. (RF / RS) < (ZL/ RB) -88 dBVIN -74 dBVIN -54 dBVIN -40 dBVIN 3. VBIAS = VP5 - VP7 4. Measured at pin 7 500 - 75 - 08 2 RB IAMP VB= 1.3 VDC 4Ω7 5 2k2 4 200 mV REF VREG 1µ0 16 dB 28 dB 3 3k9 -A + C _ - B 0µ1 7 VIN CONTROL 6 2 1 8 RF 0µ1 1µ0 22k VO 100k All resistors in ohms, all capacitors in farads unless otherwise stated Fig. 1 Test Circuit 5 7 8 4 REGULATOR 1 BASE CURRENT COMPENSATION 3 6 _ CONTROL _ 1k 120k 2 Fig. 2 Functional Schematic 3 500 - 75 - 08 VB=1.3 VDC 5 ED1913 4 200 mV REF VREG 1µ0 RS 3k9 16 dB 28 dB CS 3 -A + C _ - B 0µ1 7 CONTROL 1 6 2 8 1µ0 0µ1 20K 100k RVC All resistors in ohms, all capacitors in farads unless otherwise stated Fig. 3 Typical Hearing Aid Application 0 0 RVC = 100k -10 -10 RVC = 47k -20 RVC = 22k OUTPUT (dBV) OUTPUT (dBV) -20 -30 -40 -50 RVC = 3.3K -60 -30 -40 -50 -60 RVC = 10K -70 -70 -80 -100 -90 -80 -70 -60 -50 -80 -100 -40 -90 -80 -70 -60 -50 INPUT (dBV) INPUT (dBV) Fig. 4 I/O Characteristics at Various RVC Values (Pin 7) Fig. 5 I/O Characteristics at Pin 1 -40 5 4 2 -2 CS = 0.1µF -4 RELATIVE GAIN (dB) RELATIVE OUTPUT (dB) 0 CS = 0.22µF 0 CS = 0.033µF -6 CS = 0.047µF -8 -10 -12 -5 -10 -15 -20 -14 -16 -25 -18 -20 -30 20 200 FREQUENCY 2K 0.7 20K 0.9 1.0 1.1 1.2 SUPPLY VOLTAGE (VDC) Fig. 6 Closed Loop Frequency Response at Various CS Values 500 - 75 - 08 0.8 Fig. 7 Gain vs Supply Voltage 4 1.3 1.4 RELATIVE REFERENCE VOLTAGE (mVDC) 1.4 1.2 RELATIVE GAIN (dB) 1.0 0.8 0.6 0.4 0.2 0.0 -0.2 -0.4 -0.6 -0.8 -1.0 -20 -10 0 10 20 30 40 30 20 10 0 -10 -20 -30 -40 -50 50 -20 -10 0 10 20 30 40 50 TEMPERATURE (˚C) TEMPERATURE (˚C) Fig. 8 Gain vs Temperature Fig. 9 Receiver Bias Voltage vs Temperature RELATIVE AMPLIFIER CURRENT (µA) 50 40 30 20 10 0 -10 -20 -30 -40 -50 -60 -70 -20 -10 0 10 20 30 40 50 TEMPERATURE (˚C) Fig. 10 Amplifier Current vs Temperature REVISION NOTES Changes to standard packaging information. 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. Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. © Copyright Sept. 1982 Gennum Corporation. All rights reserved. Printed in Canada. 5 500 - 75 - 08