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CIC, Class D Hybrid
GS3024A - DATA SHEET
FEATURES * small outline for CIC applications * designed to drive class D integrated receivers * on chip voltage regulator for improved end of battery life operation * adjustable symmetrical peak clipper for MPO control * low current drain (150 A 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) DESCRIPTION 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. 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. 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.
VREG 4 C1 01
REGULATOR
1 VB
50k IN 5 C2 01 -A -B
C3 22n
8 OUT
50k
GS3024A
3 AIN
All resistors in ohms, all capacitors in farads unless otherwise stated.
2
6
7
AOUT MPO GND
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: hipinfo@gennum.com
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ABSOLUTE MAXIMUM RATINGS
PARAMETER Supply Voltage Power Dissipation Operating Temperature Storage Temperature VALUE & UNITS 3 V DC 8 25 mW -10 to + 40 C -20 to +70 C 1 OUT
PIN CONNECTION
GND MPO IN
7
6
5
2
3
4
CAUTION
CLASS 1 ESD SENSITIVITY
VB
AOUT
AIN
VREG
ELECTRICAL CHARACTERISTICS
Conditions: Supply Voltage VB = 1.3VDC, Temperature 25 oC, Frequency = 1 kHz.
PARAMETER Amplifier Current Regulator Voltage Regulator Power Supply Rejection Input Referred Noise STAGE A Input Bias Voltage Input Bias Current Output Voltage Swing Low Open Loop Voltage Gain STAGE B Maximum Output Level MPO Range Output Impedance SYSTEM AC Voltage Gain Change in Gain
SYMBOL IAMP VREG PSRR IRN
CONDITION
MIN 80 0.87 -
TYP 150 0.92 63 2
MAX 220 0.97 -
UNITS A V dB VRMS
NFB at 200 Hz to 10 kHz
-
VBIAS IBIAS VOL AOL At DC
500 -25 200 46
570 0 250 53
630 25 -
mV nA mV dB
MPO MPO ROUT
VIN = -50 dBV VIN = -50 dBV, RMPO = 50 k
-14.5 14 20
-12.5 16 25
-10.5 18 30
dBV dB k
GAIN GAIN
VIN = -66 dBV RMPO = 100 k VIN = -78 dBV
40 -
42 0
44 2.5
dB dB
All conditions and parameters remain as shown in test circuit unless stated in "conditions " column.
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1.3VDC
4 C1 01
REGULATOR
1
50k 3k9 5 VIN 1kHz 0dBV C2 01 -A -B
C3 22n 8
VOUT
50k
50k
GS3024A
3 2 6 7
100k
All resistors in ohms, all capacitors in farads unless otherwise stated.
RMPO=0
Fig. 1 Production Test Circuit
VB
4 C1 01
REGULATOR
1
50k
EM3046 or MODEL 39
5 C2 01
-A
-B
C3 22n
8 22
ES3127
50k
GS3024A
3 RVC 100k
All resistors in ohms, all capacitors in farads unless otherwise stated.
2
6
7
Fig. 2 Typical Hearing Instrument Application (Minimum Parts Configuration)
3
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BATTERY
4
3
2
1
MIC
5
6
7
8 22
EM3046 or MODEL 39
ES3127
Fig. 3 Typical Instrument Assembly Diagram (Minimum Parts Configuration)
4 C1 01
REGULATOR
50k 3k9 5 VIN C2 01 -A -B
50k
GS3024A
3 RVC 100k
All resistors in ohms, all capacitors in farads unless otherwise stated.
2
6
7
RMPO=0
Fig. 4 Characterization Circuit (Used to generate typical curves)
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4
+
+ REC
1.3VDC 1 C3 22n 8 50k VOUT
-
RVC
+
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-10 -15 -25 -35
-10 -15 -20
R MPO=0 RMPO=3.3k R MPO=10k R MPO=22k R MPO=50k
R VC = 100k
OUTPUT (dBV)
-45 -55 -65 -75 -85 -95 -140
R VC = 33k RVC = 10k
OUTPUT (dBV)
-20
-25 -30 -35 -40 -45 -50
RVC = 3.3k
-120
-100
-80
-60
-40
-90
-80
-70
-60
-50
-40
-30
-20
INPUT (dBV)
INPUT (dBV)
Fig. 5 I/O for Various R VC Settings
Fig. 6 I/O for Various RMPO Settings
1 0 -2 -4 -6 -8 -10
10 9
RELATIVE OUTPUT (dBV)
RVC =10k RVC=50k THD (%)
20k
8 7 6 5 4 3
RVC =100k
-12 -14 -16 100 1k 10k
2 1 0 -90 -86 -82 -78 -74 -70 -66 -62 -58 -54
FREQUENCY (Hz)
INPUT (dBV)
Fig. 7 Frequency Response for Various RVC Values
Fig. 8 Distortion vs Input Level (RVC = 100 k)
5
2 0 -2
RELATIVE AMPLIFIER CURRENT (A)
0 -5 -10 -15 -20 -25 -30 -35 -40 -45 -50 -55 -60 0 10 100 1k 10k 100k
RELATIVE OUTPUT (dBV)
-4 -6 -8 -10 -12 -14 -16 -18 -20 -22 -24 0 10 100 1k 10k 100k
R
MPO
()
RMPO ()
Fig. 9 Quiescent Current vs MPO Resistance
Fig. 10 Output vs MPO Resistance
5
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-58
54 50
-59
46 42
-60
38
PSRR (dB)
GAIN (dB)
100 1k 10k 100k
-61
34 30 26 22
-62
-63
18 14
-64
10 10 100 1k 10k 100k
FREQUENCY (Hz)
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
6
5
1
2
3
4
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.
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. (c) Copyright January 1995 Gennum Corporation. All rights reserved.
Printed in Canada.
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