Gennum Corporation GS3026 Datasheet
AGC-O in a CIC Size Hybrid
FEATURES DESCRIPTION
GS3026 - DATA SHEET
• CIC suitable package size
• 8:1 compression ratio
• 38 dB maximum system gain,
adjustable over a 38 dB range
• output compression threshold,
adjustable over 16 dB range
• designed to drive a class D integrated receiver
• averaging detector
STANDARD PACKAGING
Hybrid typical dimensions:
0.162 in x 0.094 in x 0.070 in
(4.11 mm x 2.39 mm x 1.78 mm)
V
B
1
GS3026
The GS3026 CIC hybrid features AGC-O capability for low
distortion output limiting and offers a package size suitable
for CIC instruments. The circuit consists of a newly designed
AGC preamplifier and output stage, capable of driving the
class D integrated receiver. The compression control
circuit varies the current controlled resistance, connected
between the input and output of the AGC preamplifier. The
compression circuit operates with an 8:1 compression
ratio and uses an averaging detector with a time constant
of 270 ms, selected to provide optimal sound quality over
the full range of sound and listening environments. The
actual attack and release times are typically 40 ms and 150
ms respectively when the circuit is fully in the compression
region of operation (measured times will vary depending
on gain and threshold settings).
The system gain and compression control can be adjusted
by the choice of two independent resistors. Maximum
system gain is 38 dB and it can be adjusted within a 38 dB
range. The output compression threshold can be adjusted
within a 16 dB range.
R
R
vc
TH
6
4
C3
0µ15
V
3
REG
IN
GND
Revision Date: July 1998
GENNUM CORPORATION P.O. Box 489, Stn. A, Burlington, Ontario, Canada L7R 3Y3 tel. +1 (905) 632-2996
C1
0µ1
C2
2
0µ1
7
All resistors in ohms, all capacitors in farads unless otherwise stated.
REG.
-A
12k
8:1
COMPRESSION
CONTROL
RECT.
B
C5
22n
BLOCK DIAGRAM
Web Site: www.gennum.com E-mail: hipinfo@gennum.com
V
B
48k
48k
C4
OUT
5
33n
Document No. 521 - 71 - 02
ABSOLUTE MAXIMUM RATINGS
PARAMETER VALUE / UNITS
Supply Voltage 3 VDC
Power Dissipation 25 mW
3026
Operating Temperature Range -10° C to 40° C
Storage Temperature Range -20° C to 70° C
PAD CONNECTION
V
B
1
GND
7
CAUTION
2
3
4
5
CLASS 1 ESD SENSITIVITY
IN
V
REG
R
VC
OUT
ELECTRICAL CHARACTERISTICS
Conditions: Frequency = 1 kHz, Temperature = 25°C, Supply Voltage V
PARAMETER SYMBOL CONDITIONS MIN TYP MAX UNITS
Hybrid Current I
Minimum Voltage V
AMP
B
Total Harmonic Distortion THD VIN=-60dBV - 0.5 1 %
Input Referred Noise IRN A weighted - 2 2.5 µVRMS
Total System Gain A
Regulator Voltage V
V
REG
VIN=-70dBV 35 38 41 dB
Power Supply Rejection Ratio PSRR 49 57 - dB
AGC
Maximum Threshold TH
MAX
VIN=-60dBV -43 -41 -39 dBV
(Output Referred) Note 2
Minimum Threshold TH
MIN
VIN=-70dBV R
(Output Referred) Note 2
VC Gain Range ∆A
Compression Ratio High Threshold CMP-H V
Compression Ratio Low Threshold CMP-L V
Stage A Gain A
Compression Gain Range A
AGC Time Constant τ
VC
A
RANGE
AGC
R
VC
=-60dBV to -30dBV RTH=0 8 9.0 10 ratio
IN
=-70dBV to -40dBV RTH=200k 6.5 7.3 9 ratio
IN
VIN=-70dBV 24 27 30 dB
RTH=200k; Note 1 47 50 55 dB
OUTPUT STAGE
Gain A
B
Output Resistance 20 24 28 kΩ
All parameters and switches remain as shown in the Test Circuit unless otherwise stated in CONDITIONS column.
Note 1.
A
2. Measured at output of Stage A
RANGE
= AA -AA [V
= -20dBV]
IN
= 1.3 V
B
- 165 240 µA
- 1.1 - V
890 950 1000 mV
= 200k -59 -57 -55 dBV
TH
=200kΩ to 0Ω 35 38 41 dB
- 270 - ms
91113dB
6
R
TH
521 - 71 - 02
2
GS3026
V
B
Rvc=200k
1
4
=0
R
TH
6
C3
0µ15
3026
3
C1
0µ1
REG.
8:1
COMPRESSION
CONTROL
RECT.
V
B
48k
C2
V
IN
3k9
2
0µ1
12k
-A
B
48k
C4
33n
V
OUT
5
50k
7
C5
22n
All resistors in ohms, all capacitors in farads unless otherwise stated.
Fig. 1 Production Test Circuit
V
B
R
TH
6
4
C3
0µ15
GS3026
R
vc
1
Any Knowles
or Microtronic
Microphone
3
C1
0µ1
C2
2
2
0µ1
7
All resistors in ohms, all capacitors in farads unless otherwise stated.
REG.
COMPRESSION
-A
12k
Fig. 2 Typical Hearing Instrument Application
8:1
CONTROL
C5
22n
RECT.
V
V
B
48k
B
48k
C4
33n
2µ2
5
B
Any Knowles
class D
integrated
receiver
521 - 71 - 023
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