DynamEQ
II
WDRC System
FEATURES
dual channel signal processing
2nd (4th) order state variable filter
adjustable crossover frequency
adjustable compression ratio from 1:1 to 4:1
independent compression ratio adjustment for
low and high frequency band
adjustable AGC threshold levels
unique twin average detectors
handles high input levels
low THD and IMD distortion
drives class D Integrated Receivers
MPO range externally adjustable
STANDARD PACKAGING
Hybrid Typical Dimensions
0.180 in x 0.110 in x 0.080 in
(4.57 mm x 2.79 mm x 2.03 mm)
DEVICE DESCRIPTION
The DynamEQ
II hybrid family is a second generation Wide
Dynamic Range Compression (WDRC) system.
GS3027 (GS3028) Hybrid incorporates 12 dB/oct (24 dB/
oct) filtering and is designed to accommodate CIC and ITC
size requirements.
The gain and frequency response is dependant on the user's
environment.
Twin averaging detector circuits are optimized for sound
quality during normal listening without sacrificing comfort
during sudden loud inputs.
All input signals to DynamEQ
II, are processed by 2:1
compression before subsequent band splitting.
The 12 dB/oct (24 dB/oct) band split filter ahead of the
expander/compressor circuits allows for independent
compression ratio adjustment (1:1 to 4:1) in high and low
frequency channels.
The gain setting stage is followed by a class D Integrated
Receiver preamplifier stage. Symmetrical peak clipping is
used to achieve MPO adjustment.
GS3027/GS3028 - DATA SHEET
Revision Date: May 1998
FUNCTIONAL BLOCK DIAGRAM
OUT
V
B
C
SAD
MPO
IN
GND
4:1
2:1
1:1
B
OUT
B
IN
F
OUT
R
c
V
REG
R
TH
R
HI
R
LO
2
10n
C1
GS3027
C2
C5
C4
C3
0
1
0
1
0
1
0
2
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
CONTROL
10k
RECTIFIER
RAGC_IN
V
B
50k
REGULATOR
48k
48k
8k4
1M
1M
14k
12k
1
X
- B
- A
- C
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
High Frequency
Expander / Compressor
Low Frequency
Expander / Compressor
(GS3028)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
R
H
R
L
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
Patent Pending
Document No. 521 - 34 - 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
521 - 34 - 03
2
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Hybrid Current
I
AMP
-
370
530
A
Minimum Voltage
Vb
1.1
-
-
V
Total Harmonic Distortion
THD
V
IN
= -40dBV at 1kHz
-
0.2
1.0
%
THD with Maximum Allowable Input
THD
M
V
IN
= -23dBV, Rvc = 47k
-
2
10
%
Input Referred Noise
IRN
Aweight
-
3.0
-
V
RMS
Total System Gain
A
V
V
IN
= -90dBV
46
49
52
dB
Regulator Voltage
V
REG
I
LOAD
= 30
A
890
930
1000
mV
AGC
Lower Threshold
TH
LO
-91
-87
-83
dBV
Upper Threshold
TH
HI
-36
-32
-28
dBV
Compression Gain Range
A
Gain(-90dBV
IN
) -Gain(-30dBV
IN
)
37.5
40.5
43.5
dB
System Gain in Compression
A
60
V
IN
=-60dBV
26
29
32
dB
Min. Compression Ratio
CMP
1 :1
V
IN
=3kHz, -60dBV to -40dBV,
Rhp=1:1 Rlp=1:1
0.9
1.0
1.1
Ratio
Max. Comp. Ratio
CMP
4 :1
V
IN
=3kHz, -60dBV to -40dBV,
Rhp=4:1, Rlp=4:1
3.6
4.0
4.3
Ratio
Fast Detector Time Constant
FAST
-
10
-
ms
Slow Detector Time Constant
SLOW
-
220
-
ms
FILTER
Maximum Cross-over Frequency
c_0
R
c
=0
3.0
3.9
-
kHz
Nominal Cross-over Frequency
c_22
R
c
=22k
1.5
1.9
2.3
kHz
Minimum Cross-over Frequency
c_220
R
c
=220k
-
0.9
1.4
kHz
Filter Rolloff Rate (GS3027)
-
12
-
dB/oct
(GS3028)
-
24
-
dB/oct
STAGE A and B
-
-
-
Open Loop Gain (B)
A
OL_B
-
52
-
dB
Input Impedance (A)
R
IN
9
11
13
k
OUTPUT STAGE
Stage Gain
A
C
V
IN
=-30dBV
7
9
11
dB
Max Output Level
MPO
R
VC
=220k
,V
IN
=-25dBV
-14.5
-12.5
-10.5
dBV
MPO Range
MPO
R
MPO
=0
to 50k
13
15
17
dB
Output Resistance
R
OUT
-
24
-
k
CAUTION
CLASS 1 ESD SENSITIVITY
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE / UNITS
Supply Voltage
3 VDC
Power Dissipation
25 mW
Operating Temperature Range
-10
C to 40
C
Storage Temperature Range
-20
C to 70
C
PAD CONNECTION
Conditions: Supply Voltage V
B
= 1.3 V, Frequency = 1 kHz, Temperature = 25
C
ELECTRICAL CHARACTERISTICS
R
HI
V
B
R
LO
4:1
2:1
1:1
C
SAD
B
OUT
B
IN
Rc
F
OUT
OUT
MPO
V
REG
Rth
IN
GND
1 2 3 4
14 15 16 17
13 12 11 10 9 8
6
7
5
1 2 3 4 6
14 15 16 1 7
13 12 11 10 9 8
7
5
2:1
MPO
R
TH
All conditions and parameters remain as shown in Test Circuit unless otherwise stated in "Conditions" column.
521 - 34 - 03
3
0
22
0
22
R
MPO
=0
R
TH
=
= 22k
R
VC
=100k
3.9k
2
2
50k
V
IN
V
B
R
c
2
10n
C1
GS3027
C2
C5
C4
C3
0
1
0
1
0
1
0
2
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
CONTROL
10k
RECTIFIER
RAGC_IN
V
B
50k
REGULATOR
48k
48k
8k4
1M
1M
14k
12k
1
X
- B
- A
- C
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
High Frequency
Expander / Compressor
Low Frequency
Expander / Compressor
(GS3028)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
R
L
R
H
Fig. 1 Production Test Circuit
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
Fig. 2 Maximum Flexibility Hearing Instrument Application
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
Any Knowles
or
Microtronics
microphone
0
22
0
22
R
MPO
RTH
100k
Log
R
c
100k Log
50k
Log
R
VC
100k Log
200k Linear
200k Linear
2
2
2
Any
Knowles
Class D
receiver
VB
VB
RHI
RLO
2
10n
C1
GS3027
C2
C5
C4
C3
0
1
0
1
0
1
0
2
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
CONTROL
10k
RECTIFIER
RAGC_IN
VB
50k
REGULATOR
48k
48k
8k4
1M
1M
14k
12k
1
X
- B
- A
- C
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
High Frequency
Expander / Compressor
Low Frequency
Expander / Compressor
(GS3028)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
RH
RL
521 - 34 - 03
4
Fig. 3 Minimum Component Hearing Instrument Application
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
Fig. 4 Characterization Circuit (Used to generate typical curves)
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
0
22
0
22
R
VC
100k Log
2
Any Knowles
or
Microtronics
microphone
Any
Knowles
Class D
receiver
VB
VB
2
10n
C1
GS3027
C2
C5
C4
C3
0
1
0
1
0
1
0
2
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
CONTROL
10k
RECTIFIER
RAGC_IN
VB
50k
REGULATOR
48k
48k
8k4
1M
1M
14k
12k
1
X
- B
- A
- C
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
High Frequency
Expander / Compressor
Low Frequency
Expander / Compressor
(GS3028)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
RH
RL
0
22
0
22
R
MPO
=0
R
TH
=
R
c
=100k
R
VC
=100k
R
HI1
= 200k
R
HI2
= 0
R
LO2
= 0
R
LO1
= 200k
V
B
=1.3V
3.9k
2
2
10n
C1
GS3027
C2
C5
C4
C3
0
1
0
1
0
1
0
2
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
CONTROL
10k
RECTIFIER
V
B
50k
REGULATOR
48k
48k
50k
8k4
1M
1M
14k
12k
1
X
- B
- A
- C
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
Pink Noise
Generator
or
1kHz for I/O
(GS3028)
RAGC_IN
High Frequency
Expander / Compressor
RH
Low Frequency
Expander / Compressor
RL
1
2
3
4
6
7
5
8
9
10
11
12
13
14
15
16
17
521 - 34 - 03
5
Fig. 5 Typical Assembly Diagram
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
TYPICAL PERFORMANCE CURVES
OUTPUT LEVEL (dBV)
1.2:1
1:1
1.5:1
4:1
3:1
2:1
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100 -90 - 80 -70 -60 -50 -40 -30 -20
INPUT LEVEL (dBV)
Fig. 6 I/O Transfer function for Different Compression Ratios
50
40
30
20
10
0
-10
GAIN (dB)
V
IN
= -40dBV
V
IN
= -20dBV
V
IN
= -60dBV
V
IN
= -80dBV
V
IN
= -96dBV
20 100 1k 10k 20k
FREQUENCY (Hz)
Fig. 7 Frequency Response for Different Input Levels
1.0 1.2 1.4 1.6 1.8 2.0 2.2 2.4 2.6 2.8 3.0 3.2 3.4 3.6 3.8 4.0
COMPRESSION RATIO (RATIO)
Fig. 8 Compression Settings Resistor Ratio for High Pass
Channel (R
HI1
& R
HI2
) and Low Pass Channel (R
LO1
& R
LO2
)
50
40
30
20
10
0
-10
GAIN (dB)
20 100 1k 10k 20k
FREQUENCY (Hz)
Fig. 9 Frequency Response for Different R
VC
Values
V
IN
= -60dBV
R
VC
= 220k
R
VC
= 100k
R
VC
= 47k
R
VC
= 22k
R
VC
= 10k
R
LO1
R
LO1
+R
LO2
R
HI1
R
HI1
+R
HI2
( )
+
+
0
22
V
B
R
LO
4:1
2:1
1:1
C
SAD
OUT
MPO
V
REG
R
TH
IN
GND
0
22
BATTERY
MICROPHONE
RECEIVER
VOLUME
CONTROL
1 2 3 4
14 15 16 17
13 12 11 10 9 8
7
5
6
R
HI
R
c
B
IN
B
OUT
F
OUT
+
-
521 - 34 - 03
6
-10
-20
-30
-40
-50
-50 -40 -30 -20
INPUT LEVEL (dBV)
Fig. 10 I/O Transfer Function for
Different R
MPO
Resistors
COMPRESSION 1:1
OUTPUT LEVEL (dBV)
R
M PO
= 0
R
M PO
= 10k
R
M PO
= 22k
R
M PO
= 50k
OUTPUT LEVEL (dBV)
R
TH
=
R
TH
= 0
R
TH
= 10k
R
TH
= 22k
R
TH
= 100k
R
TH
= 47k
-10
-20
-30
-40
-50
-60
-70
-100 -90 -80 -70 -60 -50 -40 30 -20
INPUT LEVEL (dBV)
Fig. 11 I/O Transfer Function for
Different R
TH
Resistors
50
40
30
20
10
0
-10
GAIN (dB)
20 100 1k 10k 20k
FREQUENCY (Hz)
Fig. 14 Crossover Frequency Representation
for GS3027 Processor
Rc =
1:1 in Low Frequency
4:1 in High Frequency
4:1 in Low Frequency
1:1 in High Frequency
V
IN
= -80dBV
50
40
30
20
10
0
-10
GAIN (dB)
20 100 1k 10k 20k
FREQUENCY (Hz)
Fig. 15 Crossover Frequency Representation
for GS3028 Processor
Rc =
V
IN
= -80dBV
1:1 in Low Frequency
4:1 in High Frequency
4:1 in Low Frequency
1:1 in High Frequency
1000
100
10
1
R
AGC
RESISTOR VALUE (k
)
198k
9k
R
H
& R
L
RESISTORS VALUES (k
)
-100 -90 -80 -70 -60 -50 -40 30 -20
INPUT LEVEL (dBV)
Fig. 12 Stage A Compressor Feedback Resistor Value
-100 -90 -80 -70 -60 -50 -40 30 -20
INPUT LEVEL (dBV)
Fig. 13 Expander / Compressor Resistors Values
1.6M
72k
15k
1:1
4:1
10000
1000
100
10
2:1
Crossover
Frequency
Crossover
Frequency
521 - 34 - 03
7
50
40
30
20
10
0
-10
GAIN (dB)
20 100 1k 10k 20k
FREQUENCY (Hz)
Fig. 16 GS3027 Frequency Response
for Different R
c
Resistor Values
100k
47k
22k
10k
0
50
40
30
20
10
0
-10
GAIN (dB)
20 100 1k 10k 20k
FREQUENCY (Hz)
Fig. 17 GS3028 Frequency Response
for Different R
c
Resistor Values
V
IN
= -80dBV
100k
47k
22k
10k
100 1000 10000
FREQUENCY (Hz)
Fig. 18 THD and Noise vs Frequency
10
1
0.1
THD & NOISE (%)
V
IN
= -80dBV
GS3027
GS3028
-80 -70 -60 -50 -40 -30 -20
INPUT LEVEL (dBV)
Fig. 19 THD and Noise vs Input Level
THD & NOISE (%)
GS3027
10
1
0.1
GS3028
3000 10000 100000
FREQUENCY (Hz)
Fig. 20 Intermodulation Distortion (CCIF) vs Frequency
10
1
0.1
IMD (%)
GS3028
GS3027
V
IN
= -40dBV
= 200Hz
-80 -70 -60 -50 -40 -30 -20
INPUT LEVEL (dBV)
Fig. 21 Intermodulation Distortion
(CCIF) vs Input Level
IMD (%)
= 4kHz
= 200Hz
GS3027
GS3028
10
1
0.1
0.01
1:1 in Low Frequency Gain
4:1 in High Frequency
Rc=
1:1 in Low Frequency Gain
4:1 in High Frequency
Rc=
V
IN
= -40dBV
= 1 kHz
0
521 - 34 - 03
8
Dimension units are in inches.
Dimensions in parenthesis are in millimetres converted
from inches and include minor rounding errors.
1.0000 inches = 25.400 mm.
Dimension
0.003 (
0.08) unless otherwise stated.
Smallest pad 0.0195 x 0.025 (0.50 x 0.64)
Largest pad 0.020 x 0.063 (0.50 x 1.60)
XXXXXX - work order number.
Component name - either GS3027 or GS3028.
Fig. 22 Hybrid Layout & Dimensions
GS3027
XXXXXX
0.180
(4.57)
0.090 MAX
(2.28)
2 3 4 6
1
14 15 16 1 7
13 12 11 10 9 8
7
5
0.110
(2.79)
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 April 1995 Gennum Corporation. All rights reserved. Printed in Canada.
REVISION NOTES:
Updated to Data sheet
GENNUM CORPORATION
MAILING ADDRESS:
P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3
Tel. +1 (905) 632-2996 Fax +1 (905) 632-2814
SHIPPING ADDRESS:
970 Fraser Drive, Burlington, Ontario, Canada L7L 5P5
GENNUM JAPAN CORPORATION
C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081,
Japan Tel. +81 (3) 3334-7700 Fax: +81 (3) 3247-8839
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