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Preamp Hybrid for Class D
GS3001 - HYB DATA SHEET
FEATURES * designed to drive class D integrated receivers * adjustable peak clipper * low current drain (150 A typical) * 46 dB of adjustable gain * low external parts required (R * low noise and distortion * mid supply referenced output
VC
DESCRIPTION
, RMPO)
The GS3001 incorporates Gennum's GL504 preamp, all the required coupling and decoupling capacitors, and a midsupply referencing 48 k resistor. All that is required further for a fully functioning hearing aid system is the addition of a microphone, receiver, volume control and an MPO adjusting potentiometer. The GS3001 can be mounted on the back of the hearing aid's battery compartment. It has several access pads allowing for adjustment of the frequency characteristics. An additional ground pad (8a) is also included to aid in the manufacturability of the system. The GL504 chip is Gennum's proprietary low current preamplifier designed to drive class D integrated receivers. This preamp has a built-in symmetrical peak clipping output limiter and up to 46 dB of adjustable gain. The major advantage of the GL504 over other preamplifiers is the electronic MPO adjustment. Since conventional MPO is not possible for integrated receivers, it is provided in the preamp. The maximum output swing is easily set using an RMPO resistor. The receiver output level is thus limited, preventing it from exceeding the discomfort level.
STANDARD PACKAGING * Hybrid typical dimensions 0.140 in. x 0.240 in. x 0.110 in. (3.56 mm x 6.10 mm x 2.79 mm)
VMIC
3
6 C1 33
RMIC
7 RPULL
10 VB
C2 AIN
2
-A
5
-B
8
C4
9 BOUT
47n
47n R1 48k
CIN
1
GL504
4
3
1
2
MGND 4 C3 GS3001 HYBRID
All resistors in ohms, all capacitors in farads unless otherwise stated.
47n
5 6 8a 8 7
AOUT
BIN
PGND
MPO
BLOCK DIAGRAM
Revision Date: May 1998
Document No. 520 - 46 - 08
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 Storage Temperature VALUE & UNITS 3 V DC 25 mW -10 to + 40 C -20 to +70 C
AIN VMIC MGND AOUT 2 3 4 5
PIN CONNECTION
CIN 1 10 9 8a 7 TOP VIEW MPO 8 VB BOUT PGND PGND
6 BIN
CAUTION
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Temperature 25 oC, Frequency = 1 kHz.
PARAMETER System Gain Amplifier Current Maximum Output MPO Range Input Referred Noise Distortion On Chip Pull-up Resistance On Chip Microphone Resistor Mic Decoupling Capacitor Input Coupling Capacitor Interstage Coupling Capacitor Output Coupling Capacitor Output Resistor Output Impedance (Pad 9)
SYMBOL AV IAMP MPO MPO IRN THD RPULL RMIC C1 C2 C3 C4 R1 ROUT
CONDITION VIN = -80 dBV, Frequency = 5 kHz VIN = 0, RMPO = 0 VIN = -50 dBV, RMPO = 0 VIN = -50 dBV, RMPO = 10 k NFB at 200 Hz to 10 kHz
MIN 44.5 75 -16 10 -20% -10% -10% -10% -5% -
TYP 46.5 150 -14 12 2 <1.0 48 4 3.3 0.047 0.047 0.047 48 24
MAX 48.5 225 -12 14 +20% +10% +10% +10% +5% -
UNITS dB A dBV dB VRMS % k k F F F F k k
(All conditions and parameters remain as shown in test circuit unless stated in condition column)
520 - 46 - 08
2
3
6 C1 33 C2
RMIC RPULL
7
VB = 1.3 VDC
10
IAMP C4
9
3k9
2
47n VIN 1kHz
1
5
-A
-B
8
VOUT
47n R1 48k
GL504
4
4
3 C3
1
2
GS3001 HYBRID
5
47n
6
8a
8
7
RFA =100k
All resistors in ohms, all capacitors in farads unless otherwise stated.
RMPO =10k
Fig. 1 Production Test Circuit
1.3 VDC 6 C1 33 C2 MIC
2
RMIC RPULL
3
7
10
47n
1
5
-A
-B
8
C4
9
47n 1 R1 48k
CLASS D RECEIVER
GL504
4
4
3 C3
1
2
GS3001 HYBRID
5
47n
6
8a
8
7
RFA =100k
All resistors in ohms, all capacitors in farads unless otherwise stated.
RMPO =10k
Fig. 2 Typical Hearing Instrument Application
3
520 - 46 - 08
-10 -15 -25
-10
RVC = 100k OUTPUT (dBV)
-15 -20
R
MPO
= 0
OUTPUT (dBV)
-35
R
-45 -55 -65 -75 -85 -95 -140
= 33k VC RVC = 10k
-25 -30 -35 -40 -45 -50 -100
RMPO = 3.3k RMPO = 10k
R
VC
= 3.3k
-120
-100
-80
-60
-40
-20
-90
-80
-70
-60
-50
-40
-30
-20
INPUT (dBV)
INPUT (dBV)
Fig. 3 I/O for Various RVC Settings
Fig. 4 I/O for Various RMPO Settings
2 0 -2
10
C = 0.47
9 8
RELATIVE OUTPUT (dB)
-4 -6 -8 -10 -12 -14 -16 -18 -20 20 200 2k 20k
THD (%)
7 6 5 4 3 2
C = 0.1
NO CAP.
1 0 -90 -86 -82 -78 -74 -70 -66 -62 -58
FREQUENCY (Hz)
INPUT (dBV)
Fig. 5 Frequency Response for Various C//C2 Values
Fig. 6
Distortion vs Input Level (RVC = 100 k)
0
-10 -14 -18
RELATIVE AMPLIFIER CURRENT (A)
-10 -20
No Load 50k Load
OUTPUT (dBV)
0 5 10 15 20 25 30
-30 -40 -50 -60 -70 -80 -90
-22 -26 -30 -34 -38 -42 -46 -50 1 10
100
1k
10k
100k
R
(k) MPO
R MPO ()
Fig. 7 Quiescent Current vs MPO Resistance
Fig. 8 Output vs MPO Resistance
520 - 46 - 08
4
VOLUME CONTROL
2
1
10 9
MIC
+
3
+
REC
4
8a
5 6 7 8
+
BATTERY
MPO TRIMMER
Fig. 9 Typical Assembly Diagram
TOP VIEW 2 1 10
3 0.140 (3.56) 4
9
3001
XXXXXX
8a
5
6
7
8
0.240 (6.10 ) BOTTOM VIEW
0.125 (MAX) (3.18)
C4
C2
C1
C3
Dimensioning units are inches. Dimensions shown in parenthesis are in millimetres, converted from inches and include minor round off errors. 1.0000 inches = 25.400mm Pad size 0.045 x 0.025 (1.14 x 0.64) Dimension tolerances 0.005 (+0.13) unless otherwise stated. XXXXXX - work order number. Pad numbers and capacitor numbers for illustration only.
Fig. 10 Hybrid Layout and Dimensions 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:
Updated to Data sheet
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 September 1991 Gennum Corporation. All rights reserved.
Printed in Canada.
5
520 - 46 - 08

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