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AGC-O with Active Low Cut Filter in a CIC Size Hybrid - GS3044
DATA SHEET FEATURES * * * * * * * * CIC suitable package size low distortion compression limiting 38dB maximum system gain, adjustable over a 38dB range output compression threshold, adjustable over 16dB range 2nd order active low cut filter adjustable from 530Hz to 2.0kHz designed to drive a class D integrated receiver averaging detector flexibility to add high cut filter DESCRIPTION The GS3044 CIC hybrid features AGC-O capability for low distortion output limiting with an active low cut filter in a package size suitable for CIC instruments. The circuit consists of an AGC preamplifier and output stage, capable of driving a class D integrated receiver. The compression control circuit, connected between the input and output of the AGC preamplifier, varies the current controlled resistance. It operates with an 8:1 compression ratio and uses an averaging detector with a time constant of 270ms, selected to provide optimal sound quality over a full range of sound and listening environments. The actual attack and release times are typically 40ms and 150ms respectively when the circuit is fully in the compression region of operation (measured times vary depending on gain and threshold settings). The system gain, compression control and filter corner frequency can be adjusted by choosing three independent resistors or 100k trimmers. Maximum system gain is 38dB. It can be adjusted within a 38dB range. The output compression threshold can be adjusted within a 16dB range. The filter's corner frequency can be adjusted from 530Hz to 2kHz.
GS3044
STANDARD PACKAGING Hybrid typical dimensions: 0.180 x 0.110 x 0.070 in. (4.57 x 2.79 x 1.78 mm)
VB 1
RVC 2
RTH 3 C7 015
GS3044
7 VREG C2 01
REGULATOR 8:1 COMPRESSION CONTROL 80k RECT. VB 48k C1 C3 -F 15n 6n8 10k 12k -A B 48k 33n C8 10 OUT
6 IN
C4 10n
800
C5 01 R1 = 0 5 RHP 8 FOUT 9 AIN C6 22n 4 GND Note: R1 can be desoldered from hybrid to break connection between FOUT and AIN
All resistors in ohms, all capacitors in farad, unless otherwidse stated.
BLOCK DIAGRAM
Revision Date: March 2000 Document No. 521 - 90 - 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
ABSOLUTE MAXIMUM RATINGS
PARAMETER Supply Voltage Power Dissipation Operating Temperature Range VALUE 3 VDC 25 mW -10 C to 40 C -20 C to 70 C
PAD CONNECTION
VB 1 RVC RTH GND RHP
2
3
4
5
OUT
10
6
IN
GS3044
Storage Temperature Range CAUTION
ELECTROSTATIC SENSITIVE DEVICES
DO NOT OPEN PACKAGES OR HANDLE EXCEPT AT A STATIC-FREE WORKSTATION
9 AIN
8 FOUT
7 VREG
ELECTRICAL CHARACTERISTICS
CONDITIONS: Frequency = 1 kHz, Temperature = 25C, Supply Voltage VB = 1.3 V
PARAMETER Hybrid Current Minimum Voltage Total Harmonic Distortion Input Referred Noise System Gain at Peak Relative Gain at Peak with Low Cut, Note 3 Relative Gain at 500Hz, Note 3 Relative Gain at 500Hz with Low Cut, Note 3 Relative Gain at 5kHz, Note 3 Regulator Voltage Power Supply Rejection Ratio AGC Maximum Threshold (O/P Referred) Minimum Threshold (O/P Referred) VC Gain Range Compression Ratio High Threshold Compression Ratio Low Threshold Stage A Gain Compression Gain Range AGC Time Consrtant OUTPUT STAGE Gain Output Resistance FILTER Minimum Corner Frequency Maximum Corner Frequency
SYMBOL IA M P VB THD IRN AV AV ALF ALC AH F VR E G PSRR
CONDITIONS
MIN -
TYP 235 0.5 4.4 38 -1.0 -3.0 -2 3 -3.0 935 56
MAX 340 1.1 1.0 41 -19 1000 -
UNITS A V % VR M S dB dB dB dB dB mV dB
VIN = -60dBV A weighted, RH P = 100k Frequency = 2.8kHz, RH P = 100k Frequency = 2.8kHz, RH P = 0 Frequency = 500Hz, RH P = 100k Frequency = 500Hz, RH P = 0 Frequency = 5kHz, RH P = 100k
35 -27 890 49
TH M A X THM I N AVC CMP-H CMP-L AA AR A N G E
VIN = -60dBV, Note 2 VIN = -70dBV, RTH = 100k, Note 2 RV C = 100k to 0 VIN = -60dBV to -30dBV, RTH = 0 VIN = -70dBV to -40dBV, RTH = 100k VIN = -70dBV Note 1
-43 -59 35 8.0 6.5 24 47 -
-41 -57 38 9.0 7.3 27 53 270
-39 -55 41 10.0 9.0 30 55 -
dBV dB V dB ratio ratio dB dB ms
AG C
AB RO P
-
11 24
-
dB k
C _M I N C _M A X
-
530 2
-
Hz kHz
All parameters and switches remain as shown in the Test Circuit unless otherwise stated in the CONDITIONS column. NOTE: 1. ARANGE = AA - AA[VIN = -20dBV, RTH = 100k] 2. Measured at output of Stage A 3. Relative to System Gain at Peak
521 - 90 -02
2
VB Rvc=100k
1 2 3 C7 015
RTH =0
GS3044
7 VREG C2 01
REGULATOR 8:1 COMPRESSION CONTROL 80k RECT. VB 48k C1 C3 -F 15n 6n8 10k 12k -A B 48k 33n C8 10
GS3044
VOUT 50k
6 3k9
VIN
C4 10n
800
C5 01 R1 = 0 5 8 FOUT 9 AIN
All resistors in ohms, all capacitors in farad, unless otherwidse stated.
C6 22n 4
RHP 100k
Fig. 1 Production Test Circuit
VB
Rvc 100k (Log) 2 3
RTH 100k (Log) C7 015
1
GS3044
7 C2 01
REGULATOR 8:1 COMPRESSION CONTROL VB RECT. C1 15n C3 6n8 -F 10k 12k -A B 48k 33n
Any Knowles class D integrated receiver
80k VB 48k C8 10 22
6
Any Knowles or Microtronic Microphone
C4 10n 800 C5 01 R1 = 0 5 RHP 100k (Log) 8 9
All resistors in ohms, all capacitors in farad, unless otherwidse stated.
C6 22n 4
Fig. 2 Typical Application Circuit
3
521 - 90 - 02
7
8
R1
9 10
MIC
+
6 5 4 3 2
1
GS3044
RHP
RTH
RVC
+
BATTERY
+
RECEIVER
22
Fig. 3 Typical Hearing Instrument Assembly Diagram
1.3V Rvc=100k 1 2 3 C7 015 RTH =100k
GS3044
7 C2 01
REGULATOR 8:1 COMPRESSION CONTROL
80k RECT. C1 6 15n C3 6n8 C4 10n 800 C5 01 R1 = 0 5 RHP 100k 8 9 AIN C6 22n 4
All resistors in ohms, all capacitors in farad, unless otherwidse stated.
VB 48k C8 VOUT 10 48k 33n 50k
3k9
-F 10k 12k
-A
B
Pink Noise Generatoror 1kHz for I/O
Fig. 4 Characterization Circuit (used to generate typical curves)
521 - 90 -02
4
TYPICAL PERFORMANCE CURVES
-15 -20 -25 -30 -35 -40 -45 -50 -55 -60 -65 -70 -75 -80 -85 -90 -95 -140
-20
RVC = 100k 50k 25k 12.1k 4.75k 1.5k 0
-25 -30
RTH=0 RTH=25k
OUTPUT (dBV)
OUTPUT (dBV)
-35 -40 -45
RTH=100k
GS3044
RTH=0 VIN = 1kHz
-50 -55 -60 -65
VIN =1kHz RVC = 100k
-120
-100
-80
-60
-40
-20
0
-70 -140
-120
-100
-80
-60
-40
-20
0
INPUT (dBV)
INPUT (dBV)
Fig. 5 Input vs Output Volume Control Settings
Fig. 6 Input vs Output Threshold Settings
45 40 35 30
RTH=0 RTH=25k RTH=50k RTH=100k
45
RHP = 100k
40 35 30
RHP = 0
GAIN (dB)
25 20 15 10 5 0 100
GAIN (dB)
VIN = -70dBV RVC = 100k
25 20 15 10
5 VIN = -70dBV RVC = 100k RTH = 0
1k
10k
0 100
1k
10k
FREQUENCY (kHz)
FREQUENCY (kHz)
Fig. 7 Frequency Response vs RTH
Fig. 8 Frequency Response vs RHF
10 6
VIN = 1kHz RVC = 100k
5
THD (%)
RTH = 0
1
THD (%)
4 3 2 RTH = 0 VIN = -40dBV RVC = 100k
RTH = 100k
1 RTH = 100k 0 100
0.1 -90
-80
-70
-60
-50
-40
-30
-20
-10
0
1k
10k
INPUT (dBV)
FREQUENCY (kHz)
Fig. 9 THD vs Input
Fig. 10 THD vs Frequency
5
521 - 90 - 02
0.1
PACKAGE DIMENSIONS
RVC =100k VIN =1kHz
0.110 (2.79)
RTH = 0
GS3044
0.01 -80
-70
-60
-50
-40
-30
-20
-10
0
INPUT (dBV)
Fig. 11 Intermodulation distortion vs Input
0.079 MAX (2.01)
1
10
10
9
1
RVC =100k VIN -40dBV
0.1
RTH = 0
Dimensions are in inches. Dimensions shown in parenthesis are in millimeters, converted from inches and include minor rounding errors. 1.0000 inches = 25.400mm. Dimension tolerances 0.003 (+0.08) unless otherwise stated. Minimum Pad size: 0.027 x 0.026in (0.68 x 0.71mm) XXXXXX - work order number. This hybrid is designed for point-to-point manual soldering.
IMD (%)
0.01 3k
10k
100k
FREQUENCY (kHz)
Fig. 12 Intermodulation Distortion vs Frequency
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
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. REVISION NOTES: Updated to Data Sheet; Correction to Figure 7.
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
Gennum Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement. (c) Copyright September 1998 Gennum Corporation. All rights reserved.
521 - 90 -02
6
GS3044 XXXXXX
0.180 (4.57) 2 3 4 5 C3 C1 6 R1 8 C4 7
Printed in Canada.
IMD (%)

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