DESCRIPTION
The GS3015 incorporates Gennum's GL504 preamp, three of
the required capacitors and a mid supply referencing 48K
resistor. All that is required for a fully functional hearing aid
system is the addition of a microphone, receiver, volume
control, interstage coupling capacitor and an MPO adjusting
potentiometer.
The GS3015 has been designed to mount on the back of the
Microtronics PJ88S Socket Volume Control. This translates to
a saving in space within the hearing instrument, as the circuitry
mounts directly beneath the volume control. If the VC requires
replacing, it is a simple procedure to remove the defective unit
from the socket and install a new device. This does not disturb
the electronic circuitry.
The major advantage of the GL504 over other preamplifiers is
the electronic MPO adjustment. Since conventional MPO is not
possible in a class D receiver, Gennum provides it in the
preamp.
BLOCK DIAGRAM
V.C. Preamp Hybrid
for Class D
Gennum's GL504 preamp
mounts on back of Microtronic PJ88S VC Socket
low external parts count
designed to drive Class D integrated receivers
adjustable peak clipper
low current drain (150
A) typical
low noise and distortion
FEATURES
STANDARD PACKAGING
Hybrid Typical Dimensions
0.192 in x 0.194 in x 0.113 in
(4.88 mm x 4.93 mm x 2.85 mm)
GS3015 - HYB DATA SHEET
C2
47n
C3
47n
V
B
5
R
MIC
7
V
REC
GND
R1
48K
3
2
8
6
1
4
GS3015
R
PULL
C1
33
10
A
OUT
9
5
3
6
HYBRID
- B
1
7
8
A
IN
V
MIC
2
4
C
IN
CT
B
IN
MPO
11
B
OUT
- A
All resistors in ohms, all capacitors
in farads unless otherwise stated
Revision Date: May 1998
Document No. 520 - 92 - 05
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
520 - 92 - 05
2
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE/UNITS
Supply Voltage
3 V DC
Power Dissipation
25 mW
Operating Temperature Range
-10
C to +40
C
Storage Temperature Range
-20
C to +70
C
CAUTION
CLASS 1 ESD SENSITIVITY
PIN CONNECTION
PARAMETER
SYMBOL
CONDITIONS
MIN TYP MAX UNITS
Amplifier Current
I
AMP
V
IN
= 0, R
MPO
= 0
75
150
225
A
System Gain
A
V
V
IN
= -80 dBV, R
MPO
= 0
, Freq.= 5 kHz
44.5
46.5
48.5
dB
Maximum Output
MPO
V
IN
= -50 dBV, R
MPO
= 0
-16
-14
-12
dBV
MPO Range
MPO
V
IN
= -50 dBV, R
MPO
= 10 k
10
12
14
dB
Input Referred Noise
IRN
NFB 0.2 to 10 kHz at 12 dB/oct
-
2
-
V
RMS
Distortion
THD
-
<1.0
-
%
On Chip Pull-up Resistance
R
PULL
-
48
-
k
On Chip Microphone Resistor
R
MIC
-
4
-
k
Mic Decoupling Capacitor
C1
-20%
3.3
+20%
F
Input Coupling Capacitor
C2
-10%
0.047
+10%
F
Output Coupling Capacitor
C3
-10%
0.047
+10%
F
Output Resistor
R1
-5%
48
+5%
k
Output Impedance (Pad 1)
R
OUT
-
24
-
k
ELECTRICAL CHARACTERISTICS
Conditions: Frequency = 1 kHz, Temperature = 25
C
All parameters and switches remain as shown in Test Circuit unless otherwise stated in "Conditions" column
CT
BIN
MPO
CIN
BOUT
VMIC
8
11
6
7
10
9
2
1
3
4
5
VREC
AOUT
GND
VB
AIN
TOP VIEW
520 - 92 - 05
3
C2
47n
C3
47n
1.3 VDC
5
R
MIC
7
47n
R1
48K
3
2
8
6
1
4
R
PULL
C1
33
11
VOUT
R
FA
=100K
9
5
3
6
GS3015
HYBRID
4
- B
1
7
8
R
MPO
=10K
I
AMP
V IN
1kHz
3.92K
2
10
- A
All resistors in ohms, all capacitors in farads unless otherwise stated
Fig.1 Production Test Circuit
All resistors in ohms, all capacitors in farads unless otherwise stated
Fig. 2 Typical Hearing Instrument Application
C2
47n
C3
47n
1.3 VDC
5
R
MIC
7
VC SWITCH
47n
R1
48K
1
3
2
8
6
1
4
R
PULL
C1
33
MIC
2
CLASS D
INTEGRATED
RECEIVER
VC
9
5
3
6
GS3015
HYBRID
8
4
- B
1
7
11
10
R
MPO
10K
- A
520 - 92 - 05
4
0 5 10 15 20 25 30
RMPO (k
)
Fig. 7 Relative Amplifier Current vs MPO Resistance
R
VC
=33K
R
VC
=10K
-100 -90 -80 -70 -60 -50 -40 -30 -20
INPUT (dBV)
R
MPO
=0
R
MPO
=3.3k
R
MPO
=10k
Fig. 4
I
/ O for Various R
MPO
Values
-140 -120 -100 -80 -60 -40 -20
INPUT (dBV)
Fig. 3
I
/ O for Various R
VC
Values
R
VC
=100K
20
200
2K
20K
FREQUENCY (Hz)
C=0
C=0.1
C=0.22
-15
-25
-35
-45
-55
-65
-75
-85
-95
2
0
-2
-4
-6
-8
-10
-12
-14
-16
-18
-20
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
-10
-15
-20
-25
-30
-35
-40
-45
-50
Fig. 5 Frequency Response for Various C||C2 Values
R
VC
=3.3K
10
9
8
7
6
5
4
3
2
1
0
-90 -86 -82 -78 -74 -70 -66 -62 -58
INPUT (dBV)
Fig. 6 Distortion vs Input Level (R
VC
=100k
)
RELATIVE AMPLIFIER CURRENT (
A)
OUTPUT (dBV)
THD (%)
OUTPUT (dBV)
RELATIVE OUTPUT (dB)
520 - 92 - 05
5
Fig. 10 Hybrid Layout and Dimensions
No Load
50K Load
Fig. 8 Output vs MPO Resistance
10
100
1K
10K 100K
FREQUENCY (Hz)
Fig. 9
Preamplifier A Open Loop Voltage Gain
0 10 100 1K 10K 100K
RMPO (
)
-10
-14
-18
-22
-26
-30
-34
-38
-42
-46
-50
55
50
45
40
35
Dimensioning units are inches. Dimensions shown in
parenthesis are in millimetres, converted from inches
and include minor round off errors 1.0000 inches = 25.4mm.
Minimum pad size 0.015in x 0.025in (0.38mm x 0.64mm).
Pad numbers & capacitor numbers for illustration only.
Dimensions tolerances:+0.013in -0.002in (+0.33mm -0.05mm)
unless otherwise stated.
XXXXXX - work order number.
0.080 MAX
(2.03)
0.192
(4.88)
0.123MAX
(3.13)
8
11
6
7
10
9
2
1
3
4
5
TOP VIEW
BOTTOM VIEW
0.194
(4.93)
8
11
6
7
10
9
2
1
3
4
5
C3
C2
0.063 MAX
(1.60)
C1
3015
XXXXXX
OUTPUT (dBV)
GAIN (dB)
520 - 92 - 05
6
BOTTOM VIEW
OF SWITCHES
BATTERY SWITCH
E
S
A
BATTERY SWITCH
S
A
E
BATTERY SW
BATTERY SW
eg. left volume control potentiometer
88S - 00 - 011 - 1 - 25 - 104/00
eg. right volume control potentiometer
88S - 00 - 011 - 2 - 24 - 104/00
eg. of socket
88S 10-1-1/00
For more information on Microtronic ordering codes, refer to MIcrotronic Data Sheet PJ88S
Fig. 11 Gennum Hybrid Concept with Microtronic PJ88S VC Socket
MPO TRIMMER
VOLUME
CONTROL
BATTERY
MIC
+
- +
11
9
1
10
8
7
6
5
4
3
2
REC
+
Fig. 12 Typical Assembly Diagram
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.
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 JUNE 1993 Gennum Corporation. All rights reserved. Printed in Canada.
REVISION NOTES:
Updated to Data sheet
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