Gennum Corporation GS3032, GS3031 Datasheet
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
R
ƒc
R
LO
B
OUT
BC
IN
B
IN
F
OUT
R
HI
4:1
2:11:1
0µ22
C6
C7
0µ22
GS3031
(GS3032)
10n
C1
C2
C5
C4
C3
0µ1
0µ1
0µ1
0µ2
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
R
H
R
L
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 µA
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 = 47kΩ -210%
Input Referred Noise IRN Aweight - 3.0 - µV
RMS
Total System Gain A
V
V
IN
= -90dBV 46 49 52 dB
Regulator Voltage V
REG
I
LOAD
= 30µA 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(-90dBVIN) -Gain(-30dBVIN) 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
VIN=3kHz, -60dBV to -40dBV,
Rhp=1:1 Rlp=1:1 0.9 1.0 1.1 Ratio
Max. Comp. Ratio CMP
4 :1
VIN =3kHz, -60dBV to -40dBV,
Rhp=4:1, Rlp=4:1 3.6 4.0 4.3 Ratio
Fast Detector Time Constant τ
FAST
-10-ms
Slow Detector Time Constant τ
SLOW
- 220 - ms
FILTER
Maximum Cross-over Frequency ƒ
c_0
Rƒc=0Ω 3.0 3.9 - kHz
Nominal Cross-over Frequency ƒ
c_22
Rƒc=22kΩ 1.5 1.9 2.3 kHz
Minimum Cross-over Frequency ƒ
c_220
Rƒc=220kΩ - 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
91113 kΩ
OUTPUT STAGE
Stage Gain A
C
VIN=-30dBV 7 9 11 dB
Max Output Level MPO RVC=220kΩ,VIN=-25dBV -14.5 -12.5 -10.5 dBV
MPO Range ∆MPO R
MPO
=0Ω to 50kΩ 13 15 17 dB
Output Resistance R
OUT
-24-kΩ
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 VB = 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
111410
9
8
7
6
54
32
1
17
RFC
V
REG
2.1
RHI
RLO
GNDMPO
B
OUT
B
IN
F
OUT
BC
IN
OUT
V
B
R
TH
16
13
12
4:1
IN
1.1
15
111410
9
8
7
6
54
32
1
17
RFC
V
REG
2:1
RHI
RLO
GNDMPO
B
OUT
B
IN
F
OUT
BC
IN
OUT
V
B
R
TH
16
13
12
521 - 52 - 02
3
R
MPO
=0
V
B
0µ22
C6
C7
0µ22
GS3031
(GS3032)
10n
C1
C2
C5
C4
C3
0µ1
0µ1
0µ1
0µ2
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
R
H
R
L
5
7
9
10
11
12
13
14
16
17
15
8
6
2
1
3
4
RTH= ∞
= 22k
RVC= 100k
3.9k
2µ2
V
IN
R
ƒc
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
0µ22
R
MPO
R
TH
100k
Log
R
ƒc
100k Log
50k
Log
R
VC
100k Log
200k Linear
200k Linear
2µ2
2
Any
Knowles
Class D
receiver
V
B
V
B
R
HI
R
LO
C7
0µ22
GS3031
(GS3032)
10n
C1
C2
C5
C6
C4
C3
0µ1
0µ1
0µ1
0µ2
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
R
H
R
L
5
7
9
10
11
12
13
14
16
17
15
8
6
2
1
3
4
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