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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 to 5 k 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 -10C to 40C -20C to 70C VREG A IN CAGC B OUT
PIN CONNECTION
4
5
VB GND C OUT
1
8
C IN
ELECTRICAL CHARACTERISTICS
Conditions : Temperature 25C, 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 A VDC dBV dB dB dBV VRMS % mVDC mA ms/F ms/F
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 VB= 1.3 VDC 47
5
2k2
4
10
VREG
200 mV REF
28 dB
16 dB
3
3k9 VIN 01
-A
-B
+ C _
7
CONTROL 2
6
01 10 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
10
CS RS 3k9 01
28 dB
16 dB
3
-A
-B
+ C _
7
CONTROL
2
10
6
1
8
01 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 = 0.22F
5 0
RELATIVE OUTPUT (dB)
RELATIVE GAIN (dB)
-2 -4 -6 -8 -10 -12 -14 -16 -18 -20 CS = 0.047F CS = 0.1F CS = 0.033F
-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 (A)
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. (c) Copyright Sept. 1982 Gennum Corporation. All rights reserved. Printed in Canada.
5
500 - 75 - 08

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