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
0.250 in x 0.115 in x 0.080 in)
(6.35 mm x 2.91 mm x 2.03 mm)
DynamEQ
II
WDRC System
DEVICE DESCRIPTION
The DynamEQ
II hybrid family is a second generation Wide
Dynamic Range Compression (WDRC) system.
GS3031 (GS3032) hybrid incorporates 12 dB/oct (24 dB/oct)
filtering. All capacitors necessary for operation are included
on the hybrid.
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.
FUNCTIONAL BLOCK DIAGRAM
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
Patent Pending
OUT
V
B
V
REG
R
TH
MPO
IN
GND
Rc
RLO
BOUT
BCIN BIN
FOUT
R
HI
4:1
2:1
1:1
0
22
C6
C7
0
22
GS3031
(GS3032)
10n
C1
C2
C5
C4
C3
0
1
0
1
0
1
0
2
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
CONTROL
10k
RECTIFIER
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
R
AGC_IN
RH
RL
5
7
9
10
11
12
13
14
16
17
15
8
6
2
1
3
4
GS3031/GS3032 DATA SHEET
Revision Date: July 1998
Document No. 521 - 52 - 02
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 - 52 - 02
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
All conditions and parameters remain as shown in Test Circuit unless otherwise stated in "Conditions" column.
4.1
IN
1.1
15
11
14
10
9
8
7
6
5
4
3
2
1
17
RFC
VREG
2.1
RHI
RLO
GND
MPO
BOUT
BIN
FOUT
BCIN
OUT
VB
RTH
16
13
12
4:1
IN
1.1
15
11
14
10
9
8
7
6
5
4
3
2
1
17
RFC
VREG
2:1
RHI
RLO
GND
MPO
BOUT
BIN
FOUT
BCIN
OUT
VB
RTH
16
13
12
521 - 52 - 02
3
R
MPO
=0
V
B
0
22
C6
C7
0
22
GS3031
(GS3032)
10n
C1
C2
C5
C4
C3
0
1
0
1
0
1
0
2
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
CONTROL
10k
RECTIFIER
Vb
50k
REGULATOR
48k
48k
50k
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
R
AGC_IN
RH
RL
5
7
9
10
11
12
13
14
16
17
15
8
6
2
1
3
4
R
TH
=
= 22k
R
VC
= 100k
3.9k
2
2
V
IN
R
c
Fig. 2 Maximum Flexibility Hearing Instrument Application
Fig. 1 Production Test Circuit
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
Any Knowles
or
Microtronic
microphone
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
C7
0
22
GS3031
(GS3032)
10n
C1
C2
C5
C6
C4
C3
0
1
0
1
0
1
0
2
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
CONTROL
10k
RECTIFIER
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
R
AGC_IN
RH
RL
5
7
9
10
11
12
13
14
16
17
15
8
6
2
1
3
4
521 - 52 - 02
4
Fig. 3 Minimum Component Hearing Instrument Application
Fig. 4 Characterization Circuit (Used to generate typical curves)
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
50k
Pink Noise
Generator
or
1kHz for I/O
C7
0
22
GS3031
(GS3032)
10n
C1
C2
C5
C6
C4
C3
0
1
0
1
0
1
0
2
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
CONTROL
10k
RECTIFIER
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
R
AGC_IN
RH
RL
5
7
9
10
11
12
13
14
16
17
15
8
6
2
1
3
4
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
R
VC
100k Log
Any
Knowles
Class D
receiver
VB
0
22
Any Knowles
or
Microtronic
microphone
VB
C7
0
22
GS3031
(GS3032)
10n
C1
C2
C5
C6
C4
C3
0
1
0
1
0
1
0
2
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
CONTROL
10k
RECTIFIER
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
R
AGC_IN
RH
RL
5
7
9
10
11
12
13
14
16
17
15
8
6
2
1
3
4
521 - 52 - 02
5
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. 5 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. 6 Frequency Response for Different Input Levels
-50 -40 -30 -20
INPUT LEVEL (dBV)
Fig. 9 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. 10 I/O Transfer Function for
Different R
TH
Resistors
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. 7 Compression Settings Resistor Ratio for High Pass
Channel (R
HI1
& R
HI2
) and Low Pass Channel (R
LO1
& R
LO2
)
GAIN (dB)
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
( )
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
50
40
30
20
10
0
-10
20 100 1k 10k 20k
FREQUENCY (Hz)
Fig. 8 Frequency Response for Different R
VC
Values
-10
-20
-30
-40
-50
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