GB512

Low Parts Compression Amplifier GB512/LD512 DATA SHEET FEATURES • 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 • operation down to 1.1 VDC • greater than 40 dB volume control range DESCRIPTION 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. 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. The GB512 and LD512 are recommended for low to medium gain/output ITE and ITC type hearing aids. The GB512 is tested to tighter test limits. STANDARD PACKAGING • 8 pin PLID • 8 pin SLT (LD512) • Chip (61 x 61 mils) Au Bump VB 5 VREG 4 VREG 200 mV REF 28 dB 16 dB A IN 3 -A -B + C _ 7 C OUT CONTROL 2 CAGC 6 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 ABSOLUTE MAXIMUM RATINGS PARAMETER Supply Voltage Power Dissipation Operating Temperature Range Storage Temperature Range CAUTION CLASS 1 ESD SENSITIVITY VALUE/UNITS 5 V DC 25mW -10°C to 40°C -20˚C to 70˚C VREG A IN CAGC B OUT PIN CONNECTION 4 5 VB GND C OUT 1 8 C IN ELECTRICAL CHARACTERISTICS Conditions : Temperature 25˚C, Frequency 1 kHz, Supply Voltage 1.3 VDC. GB512 MIN 110 0.88 TYP 200 0.93 -44 MAX 290 0.98 -41 MIN 110 0.88 -48 TYP 200 0.93 -44 - LD512 MAX 290 0.98 -40 VO2+13 -17.5 3 4 240 UNITS µA VDC dBV dB dB dBV µVRMS % mVDC mA ms/µF ms/µF PARAMETER Amplifier Current Regulator Voltage Output Level Output Level Output Level Output Level Input Referred Noise Total Harmonic Distortion Receiver Bias Voltage Current Sinking Capability Release Time Factor Attack Time Factor SYMBOL IAMP VREG VO1 VO2 VO3 VO4 IRN THD VBIAS ISINK TREL TATT CONDITIONS VIN = -88 dBV VIN = -74 dBV VIN = -54 dBV VIN = -40 dBV NFB 0.2-10kHz at 12dB/oct -47 VO1 + 7 VO1 + 9 VO1 + 11 VO2 + 8 VO2+10 -23 100 3 -20 1 2 200 8 100 5 VO2+12 VO2 + 7 -18 3 4 300 -23.5 160 3 - VO2+10 -20 1 2 200 8 100 5 VIN = -54 dBV Note 3 Note 4 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 VO3 O/P LEVEL VO2 (dBV) at PIN 1 VO1 Notes: 1. VO and Distortion measurements are taken at pin 1. 2. Output stage gain = 20 log (RF / RS). A gain of 14 dB is recommended for optimal stability. Stability is dependent upon the ratio of the receiver impedance (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 IAMP RB 4Ω7 VB= 1.3 VDC 5 2k2 4 1µ0 VREG 200 mV REF 28 dB 16 dB 3 3k9 VIN 0µ1 -A -B + C _ 7 CONTROL 2 6 0µ1 1µ0 22k 1 8 RF 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 _ 120k 2 1k Fig. 2 Functional Schematic 3 500 - 75 - 08 VB=1.3 VDC 5 ED1913 VREG 200 mV REF 4 1µ0 CS RS 3k9 0µ1 28 dB 16 dB 3 -A -B + C _ 7 CONTROL 2 1µ0 6 1 8 0µ1 20K All resistors in ohms, all capacitors in farads unless otherwise stated 100k RVC Fig. 3 Typical Hearing Aid Application 0 -10 RVC = 47k RVC = 100k 0 -10 -20 -20 RVC = 22k OUTPUT (dBV) -30 -40 -50 RVC = 3.3K OUTPUT (dBV) -50 -40 -30 -40 -50 -60 -60 RVC = 10K -70 -80 -100 -70 -80 -100 -90 -80 -70 -60 -90 -80 -70 -60 -50 -40 INPUT (dBV) INPUT (dBV) Fig. 4 I/O Characteristics at Various RVC Values (Pin 7) Fig. 5 I/O Characteristics at Pin 1 4 2 0 CS = 0.22µF 5 0 RELATIVE OUTPUT (dB) RELATIVE GAIN (dB) -2 -4 -6 -8 -10 -12 -14 -16 -18 -20 CS = 0.047µF CS = 0.1µF CS = 0.033µF -5 -10 -15 -20 -25 -30 20 200 FREQUENCY 2K 20K 0.7 0.8 0.9 1.0 1.1 1.2 1.3 1.4 SUPPLY VOLTAGE (VDC) Fig. 6 Closed Loop Frequency Response at Various CS Values Fig. 7 Gain vs Supply Voltage 500 - 75 - 08 4 RELATIVE REFERENCE VOLTAGE (mVDC) -20 -10 0 10 20 30 40 50 1.4 1.2 1.0 30 20 10 0 -10 -20 -30 -40 -50 RELATIVE GAIN (dB) 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 50 TEMPERATURE (˚C) TEMPERATURE (˚C) Fig. 8 Gain vs Temperature Fig. 9 Receiver Bias Voltage vs Temperature 50 RELATIVE AMPLIFIER CURRENT (µA) 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