Gennum Corporation GS3001 Datasheet
Preamp Hybrid for Class D
GS3001 - HYB DATA SHEET
FEATURES
• designed to drive class D integrated receivers
• adjustable peak clipper
• low current drain (150
µA typical)
• 46 dB of adjustable gain
• low external parts required (R
VC
, R
MPO
)
• low noise and distortion
• mid supply referenced output
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)
DESCRIPTION
The GS3001 incorporates Gennum’s GL504 preamp, all the
required coupling and decoupling capacitors, and a mid-
supply referencing 48 kΩ 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
R
resistor. The receiver output level is thus limited,
MPO
preventing it from exceeding the discomfort level.
Revision Date: May 1998
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996
3
V
MIC
A
IN
C
IN
MGND
All resistors in ohms, all capacitors
in farads unless otherwise stated.
C1
3µ3
C2
2
47n
1
4
GS3001
HYBRID
Web Site: www.gennum.com E-mail: hipinfo@gennum.com
6
5
GL504
R
MIC
-
A
4
A
OUT
BLOCK DIAGRAM
C3
47n
5
R
-
B
3
1
8a
6
BINPGND
PULL
2
8
7
8
MPO
10
V
B
C4
9
B
47n
R1
48k
7
OUT
Document No. 520 - 46 - 08
ABSOLUTE MAXIMUM RATINGS
PARAMETER VALUE & UNITS
Supply Voltage 3 V DC
Power Dissipation 25 mW
Operating Temperature -10 to + 40 °C
A
IN
V
MIC
MGND
PIN CONNECTION
C
IN
2
1
3
4
V
10
B
B
OUT
9
PGND
8a
Storage Temperature -20 to +70 °C
CAUTION
A
OUT
5
6
TOP VIEW
B
IN
MPO
8
7
PGND
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Temperature 25 oC, Frequency = 1 kHz.
PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS
System Gain A
Amplifier Current I
V
AMP
Maximum Output MPO V
MPO Range ∆MPO V
Input Referred Noise IRN NFB at 200 Hz to 10 kHz - 2 - µVRMS
VIN = -80 dBV, Frequency = 5 kHz 44.5 46.5 48.5 dB
VIN = 0, R
= -50 dBV, R
IN
= -50 dBV, R
IN
= 0 Ω 75 150 225 µA
MPO
= 0 Ω -16 -14 -12 dBV
MPO
= 10 kΩ 10 12 14 dB
MPO
Distortion THD - <1.0 - %
On Chip Pull-up Resistance R
On Chip Microphone Resistor R
PULL
MIC
-48- kΩ
-4- kΩ
Mic Decoupling Capacitor C1 -20% 3.3 +20% µF
Input Coupling Capacitor C2 -10% 0.047 +10% µF
Interstage Coupling Capacitor C3 -10% 0.047 +10% µF
Output Coupling Capacitor C4 -10% 0.047 +10% µF
Output Resistor R1 -5% 48 +5% kΩ
Output Impedance (Pad 9) R
(All conditions and parameters remain as shown in test circuit unless stated in condition column)
OUT
-24- kΩ
520 - 46 - 08
2
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