ETC GS3024A

CIC, Class D Hybrid
GS3024A - DATA SHEET
FEATURES
DESCRIPTION
• small outline for CIC applications
The GS3024A is a Gennum proprietary hybrid for CIC
applications. It incorporates a newly designed integrated
circuit which offers optimum performance in class D receiver
applications.
• designed to drive class D integrated receivers
• on chip voltage regulator for improved end of battery
life operation
The system consists of a voltage regulator, a single low noise
inverting preamplifier and a mid supply referenced output
stage. The voltage regulator provides a clean DC voltage for
the microphone and preamplifier, so that at end of battery life
conditions when the output impedance of the battery is high,
the system maintains stable operation. The preamplifier and
output stage have been optimally compensated to minimize
aliasing effects normally associated with class D operation.
The two stages have been DC coupled to reduce the external
components required, thereby minimizing the hybrid footprint.
• adjustable symmetrical peak clipper for MPO control
• low current drain (150 µA typical)
STANDARD PACKAGING
• Hybrid Typical Dimensions
0.145 in. x 0.085 in. x 0.065 in.
(3.68 mm x 2.16 mm x 1.65 mm)
The hybrid incorporates a decoupling capacitor for the regulator
as well as input and output coupling capacitors for the
microphone and receiver. In a minimum parts configuration, a
microphone, receiver and gain set resistor, need to be added
to the hybrid for a fully functional hearing instrument. Should
the application require the Maximum Power Output (MPO) to
be adjusted, a potentiometer can be added from pad 6 of the
hybrid to ground.
REGULATOR
VREG 4
1 VB
C1
0µ1
50kΩ
IN 5
-A
-B
C2
0µ1
C3
22n
8 OUT
50kΩ
GS3024A
3
AIN
2
6
7
AOUT MPO GND
All resistors in ohms, all capacitors
in farads unless otherwise stated.
BLOCK DIAGRAM
Revision Date: May 1998
Document No. 521 - 24 - 03
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: [email protected]
PIN CONNECTION
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE & UNITS
Supply Voltage
3 V DC
Power Dissipation
25 mW
OUT
8
Operating Temperature
-10 to + 40 °C
Storage Temperature
-20 to +70 °C
CAUTION
GND
7
MPO
IN
6
5
1
2
3
4
VB
AOUT
AIN
VREG
CLASS 1 ESD SENSITIVITY
ELECTRICAL CHARACTERISTICS
Conditions: Supply Voltage VB = 1.3VDC, Temperature 25 oC, Frequency = 1 kHz.
PARAMETER
SYMBOL
CONDITION
MIN
TYP
MAX
UNITS
Amplifier Current
IAMP
80
150
220
µA
Regulator Voltage
VREG
0.87
0.92
0.97
V
Regulator Power Supply Rejection
PSRR
-
63
-
dB
Input Referred Noise
IRN
-
2
-
µVRMS
NFB at 200 Hz to 10 kHz
STAGE A
Input Bias Voltage
VBIAS
500
570
630
mV
Input Bias Current
IBIAS
-25
0
25
nA
Output Voltage Swing Low
VOL
200
250
-
mV
Open Loop Voltage Gain
AOL
At DC
46
53
-
dB
Maximum Output Level
MPO
VIN = -50 dBV
-14.5
-12.5
-10.5
dBV
MPO Range
∆MPO
VIN = -50 dBV, RMPO = 50 kΩ
14
16
18
dB
Output Impedance
ROUT
20
25
30
kΩ
40
42
44
dB
-
0
2.5
dB
STAGE B
SYSTEM
AC Voltage Gain
GAIN
VIN = -66 dBV
Change in Gain
∆GAIN
RMPO = 100 kΩ VIN = -78 dBV
All conditions and parameters remain as shown in test circuit unless stated in "conditions " column.
521 - 24 - 03
2
1.3VDC
REGULATOR
4
1
C1
0µ1
50kΩ
3k9
5
-A
VOUT
8
-B
C2
0µ1
VIN
1kHz
0dBV
C3
22n
50k
50kΩ
GS3024A
2
3
100k
6
7
RMPO=0Ω
All resistors in ohms, all capacitors
in farads unless otherwise stated.
Fig. 1 Production Test Circuit
VB
REGULATOR
4
1
C1
0µ1
50kΩ
EM3046
or
MODEL 39
5
-A
-B
C2
0µ1
C3
22n
ES3127
8
2µ2
50kΩ
GS3024A
3
2
6
7
RVC
100k
All resistors in ohms, all capacitors
in farads unless otherwise stated.
Fig. 2 Typical Hearing Instrument Application
(Minimum Parts Configuration)
3
521 - 24 - 03
BATTERY
-
RVC
4
3
2
5
6
7
+
1
+
+
MIC
REC
8
EM3046
or
MODEL 39
ES3127
2µ2
Fig. 3 Typical Instrument Assembly Diagram
(Minimum Parts Configuration)
1.3VDC
REGULATOR
4
1
C1
0µ1
50kΩ
3k9
5
VIN
-A
C3
22n
C2
0µ1
50k
50kΩ
GS3024A
3
2
6
RVC
100k
RMPO=0Ω
All resistors in ohms, all capacitors
in farads unless otherwise stated.
Fig. 4 Characterization Circuit
(Used to generate typical curves)
521 - 24 - 03
4
VOUT
8
-B
7
-10
-15
-10
R VC = 100k
-25
R MPO=10k
-20
OUTPUT (dBV)
-35
OUTPUT (dBV)
R MPO=0Ω
RMPO=3.3k
-15
R VC = 33k
-45
RVC = 10k
-55
-65
RVC = 3.3k
-75
R MPO=22k
-25
R MPO=50k
-30
-35
-40
-45
-85
-50
-95
-140
-120
-100
-80
-60
-40
-20
-90
-80
-70
-60
INPUT (dBV)
Fig. 5 I/O for Various R VC Settings
-30
-20
10
9
-2
RVC =10k
-4
8
7
RVC=50k
RVC =100k
-6
THD (%)
RELATIVE OUTPUT (dBV)
-40
Fig. 6 I/O for Various RMPO Settings
1
0
-8
6
5
4
-10
3
-12
2
-14
1
-16
100
1k
10k
0
20k
-90
-86
-82
-78
FREQUENCY (Hz)
-74
-70
-66
-62
-58
-54
INPUT (dBV)
Fig. 8 Distortion vs Input Level (RVC = 100 kΩ)
Fig. 7 Frequency Response for Various RVC Values
5
2
0
0
-5
-2
RELATIVE OUTPUT (dBV)
RELATIVE AMPLIFIER CURRENT (µA)
-50
INPUT (dBV)
-10
-15
-20
-25
-30
-35
-40
-45
-4
-6
-8
-10
-12
-14
-16
-18
-50
-20
-55
-22
-24
-60
0
10
100
R
MPO
1k
10k
100k
0
10
100
1k
10k
100k
RMPO (Ω)
(Ω)
Fig. 9 Quiescent Current vs MPO Resistance
Fig. 10 Output vs MPO Resistance
5
521 - 24 - 03
-58
54
50
-59
46
42
38
GAIN (dB)
PSRR (dB)
-60
-61
-62
34
30
26
22
-63
18
14
-64
100
1k
10k
10
100k
10
100
FREQUENCY (Hz)
1k
10k
100k
FREQUENCY (Hz)
Fig. 11 Regulator Power Supply Rejection Ratio
Fig. 12 Preamplifier A Open Loop
Frequency Response
0.145
(3.68)
0.085
(2.16)
XXXXXX
0.070 MAX
(1.78)
8
7
1
2
6
3
5
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
Minimum Pad size 0.021 x 0.030 (0.53 x 0.76)
Dimension tolerances ±0.003 (±0.08) unless otherwise stated.
Pad numbers and capacitor numbers for illustration only.
This hybrid is designed for point to point manual soldering.
4
Fig. 13 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.
© Copyright January 1995 Gennum Corporation.
All rights reserved.
521 - 24 - 03
6
Printed in Canada.