OUT
V
REG
IN
GND
B
OUT
B
IN
7n4
0
14
C2
C1
C14
80n
81n
92n
81n
37k
FAST
AVERAGE
DETECTOR
SLOW
AVERAGE
DETECTOR
CONTROL
10k
R2
R1
R3
R4
RECT.
VB
3k3
85k6
42k8
REGULATOR
48k
48k
11k
2M
1M
13k1
12k
1
X
- B
- A
- C
24 dB / Oct
BAND SPLIT
FILTER
High Frequency
Exp'der / Comp'r
Low Frequency
Exp'der / Comp'r
R
AGC_IN
RH
RL
R
LO
R
HI
4:1
1:1
C
SAD
MPO
R
TH
B
OUT
B
IN
R
FC
F
OUT
A
OUT
REC
OUT
C
FAD
83n
C6
V
REF
V
REG
IN
GND
C4
C7
C3
100k
2:1
GA3202
12k
R
TH
R
C
198k
MPO
R
LO
R
HI
4:1
1:1
2:1
V
B
C8
8n5
V
BA
T
8
1
2
13
14
15
3
10
4
5
9
12
11
6
7
8n
C5
All resistors in ohms, all capacitors in farads, unless otherwise stated.
Patent Pending
DynamEQ
II
WDRC System - GA3202
FEATURES
dual channel signal processing
reflowable hybrid
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
> 95dB dynamic range
low THD and IMD distortion
drives class D integrated receivers
MPO range externally adjustable
thinSTAX
TM
PACKAGING
Hybrid Typical Dimensions:
0.190 x 0.105 x 0.050in.
(4.83 x 2.67 x 1.27mm)
DEVICE DESCRIPTION
The DynamEQ
II hybrid family is a second generation Wide
Dynamic Range Compression (WDRC) system.
The small hybrid design makes it particularly suitable for
CIC applications. GA3202 hybrid incorporates 24dB/oct
filtering. 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 24 dB/oct band split filter ahead of the expander/
compressor circuits allows for independent compression ratio
adjustments (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.
The GA3202 is designed as a CIC alternative to GS3032,
GR3032 and GS3028 with MPO adjustment range modifications.
DATA SHEET
BLOCK DIAGRAM
Document No. 521 - 91 - 04
Revision Date: March 2001
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
GA3202
2
521 - 91 - 04
GA3202
PARAMETER
SYMBOL
CONDITIONS
MIN
TYP
MAX
UNITS
Hybrid Current
I
AMP
-
380
530
A
Minimum Voltage
Vb
-
-
-
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
-
%
Input Referred Noise
IRN
Aweight
-
3.0
-
V
RMS
Total System Gain
A
V
V
IN
= -90dBV
45
48
51
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
-
8
-
ms
Slow Detector Time Constant
SLOW
-
180
-
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
-
24
-
dB/oct
STAGE A and B
-
-
-
Open Loop Gain (B)
A
OL_B
-
52
-
dB
Input Impedance (A)
R
IN
-
11
-
k
OUTPUT STAGE
Stage Gain
A
C
V
IN
=-30dBV
7.0
9
11.0
dB
Max Output Level
MPO
R
VC
=220k
,V
IN
=-25dBV
-16
-14
-12
dBV
MPO Range
MPO
R
MPO
=0
to 100k
17
19
21
dB
Output Resistance
R
OUT
-
24
-
k
ABSOLUTE MAXIMUM RATINGS
PARAMETER
VALUE
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
All conditions and parameters remain as shown in Test Circuit unless otherwise stated in "Conditions" column.
V
B
B
IN
OUT
IN
MPO
B
OUT
R
TH
R
C
R
HI
4:1
1:1
GND
V
REG
R
LO
7
2:1
1
2
3
4
6
7
8
9
10
11
12
13
14
5
5
15
GND
CAUTION
ELECTROSTATIC
SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE
EXCEPT AT A STATIC-FREE WORKSTATION
ELECTRICAL CHARACTERISTICS
3
521 - 91 - 04
GA3202
Fig. 1 Production Test Circuit
Fig. 2 Typical Application Circuit
R
VC
100k Log
2
2
VB
R
MPO
100k
Log
Any
Knowles
Class D
receiver
V
B
GND
7n4
0
14
C2
C1
C14
80n
81n
92n
81n
37k
FAST
AVERAGE
DETECTOR
SLOW
AVERAGE
DETECTOR
CONTROL
10k
R2
R1
R3
R4
RECT.
VB
3k3
85k6
42k8
REGULATOR
48k
48k
11k
2M
1M
13k1
12k
1
X
- B
- A
- C
24 dB / Oct
BAND SPLIT
FILTER
High Frequency
Exp'der / Comp'r
Low Frequency
Exp'der / Comp'r
R
AGC_IN
RH
RL
R
LO
R
HI
4:1
1:1
C
SAD
MPO
R
TH
B
OUT
B
IN
R
FC
F
OUT
A
OUT
REC
OUT
C
FAD
83n
C6
V
REF
V
REG
IN
C4
C7
C3
100k
2:1
GA3202
12k
198k
C8
8n5
V
BA
T
8
1
2
13
14
15
3
10
4
5
9
12
11
6
7
8n
C5
All resistors in ohms, all capacitors in farads, unless otherwise stated.
Any Knowles
or
Microtronics
microphone
RTH
100k
Log
R
c
100k Log
200k Linear
RHI
200k Linear
RLO
V
B
R
c
=22k
R
VC
=100k
R
MPO
=0
50k
GND
7n4
0
14
C2
C1
C14
80n
81n
92n
81n
37k
FAST
AVERAGE
DETECTOR
SLOW
AVERAGE
DETECTOR
CONTROL
10k
R2
R1
R3
R4
RECT.
VB
3k3
85k6
42k8
REGULATOR
48k
48k
11k
2M
1M
13k1
12k
1
X
- B
- A
- C
24 dB / Oct
BAND SPLIT
FILTER
High Frequency
Exp'der / Comp'r
Low Frequency
Exp'der / Comp'r
R
AGC_IN
RH
RL
R
LO
R
HI
4:1
1:1
C
SAD
MPO
R
TH
B
OUT
B
IN
R
FC
F
OUT
A
OUT
REC
OUT
C
FAD
83n
C6
V
REF
V
REG
IN
C4
C7
C3
100k
2:1
GA3202
12k
198k
C8
8n5
V
BA
T
8
1
2
13
14
15
3
10
4
5
9
12
11
6
7
8n
C5
All resistors in ohms, all capacitors in farads, unless otherwise stated.
R
TH
=
3.9k
2
2
V
IN
2
2
V
B
4
521 - 91 - 04
GA3202
Fig. 3 Characterization Circuit (Used to generate typical curves)
Fig. 4 Typical Assembly Diagram
+
+
BATTERY
MIC
RECEIVER
VOLUME
CONTROL
+
-
2
2
100k
100k
V
B
B
IN
IN
OUT
MPO
B
OUT
R
TH
R
C
R
HI
1:1
4:1
2:1
1
2
3
4
6
7
8
11
12
10
9
13
14
V
REG
R
LO
5
15
GND
GND
2
2
R
VC
=
100k
V
B =
1.3V
GND
7n4
0
14
C2
C1
C14
80n
81n
92n
81n
37k
FAST
AVERAGE
DETECTOR
SLOW
AVERAGE
DETECTOR
CONTROL
10k
R2
R1
R3
R4
RECT.
VB
3k3
85k6
42k8
REGULATOR
48k
48k
11k
2M
1M
13k1
12k
1
X
- B
- A
- C
24 dB / Oct
BAND SPLIT
FILTER
High Frequency
Exp'der / Comp'r
Low Frequency
Exp'der / Comp'r
R
AGC_IN
RH
RL
R
LO
R
HI
4:1
1:1
C
SAD
MPO
R
TH
B
OUT
B
IN
R
FC
F
OUT
A
OUT
REC
OUT
C
FAD
83n
C6
V
REF
V
REG
IN
C4
C7
C3
100k
2:1
GA3202
12k
198k
C8
8n5
V
BA
T
8
1
2
13
14
15
3
10
4
5
9
12
11
6
7
8n
C5
All resistors in ohms, all capacitors in farads, unless otherwise stated.
3k9
Pink Noise
Generator
or 1kHz for I/O
RTH =
R
c
= 100k
R
MPO
= 0
R
HI1
=200k
R
HI2
=0
R
LO2
=0
R
LO1
=200k
50k
5
521 - 91 - 04
GA3202
FREQUENCY (Hz)
GAIN (dB)
50
40
30
20
10
0
-10
20
100
1k
10k
20k
V
IN
= -60 dBV
R
IVC
= 220k
R
IVC
= 100k
R
IVC
= 47k
R
IVC
= 20k
R
IVC
= 10k
1.0
0.9
0.8
0.7
0.6
0.5
0.4
0.3
0.2
0.1
0.0
1.0 1.3 1.6 1.9 2.2 2.5 2.8 3.1 3.4 3.7 4.0
COMPRESSED RATIO (RATIO)
R
LO1
R
HI1
R
LO1
+R
LO2
(
R
HI1
+R
HI2
)
50
40
30
20
10
0
-10
20
100
1k
10k
20k
FREQUENCY (Hz)
GAIN (dB)
V
IN
= -80 dBV
V
IN
= -60 dBV
V
IN
= -40 dBV
V
IN
= -20 dBV
Fig. 10 I/O Transfer Function for
Different R
TH
Resistors
TYPICAL PERFORMANCE CURVES
Fig. 5 I/O Transfer function for Different Compression Ratios
Fig. 6 Frequency Response for Different Input Levels
Fig. 9 I/O Transfer Function for
Different R
MPO
Resistors
Fig. 7 Compression Settings Resistor Ratio for High Pass Channel
(R
HI1
& R
HI2
) and Low Pass Channel (R
LO1
& R
LO2
)
Fig. 8 Frequency Response for Different R
VC
Values
-10
-20
-30
-40
-50
-60
-70
-80
-90
-100
-90
-80
-70
-60
-50
-40
-30
-20
OUTPUT LEVEL (dBV)
INPUT LEVEL (dBV)
4 :1
2 :1
3 :1
1 :1
1.2 :1
1.5 :1
-50
-40
-30
-20
-50
-40
-30
-20
-10
RMPO =
RMPO = 22k
RMPO = 0
RMPO = 100k
RMPO = 10k
OUTPUT LEVEL (dBV)
INPUT LEVEL (dBV)
COMPRESSION 1:1
OUTPUT LEVEL (dBV)
INPUT LEVEL (dBV)
-10
-20
-30
-40
-50
-60
-70
-100
-90
-80
-70
-60
-50
-40
-30
-20
R
TH
= 0
R
TH
= 10k
R
TH
= 22k
R
TH
= 47k
R
TH
=
R
TH
= 100k
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