ETC GB570

DynamEQ® II
WDRC IC
GB570/GC570 - DATA SHEET
FEATURES
DEVICE DESCRIPTION
• dual channel signal processing
The DynamEQ® II product family is a second generation Wide
Dynamic Range Compression (WDRC) system.
• 2nd (4th) order state variable filter
GB570 (GC570) incorporates 12 dB/oct (24 dB/oct) filtering
and is designed to accommodate CIC and ITC size
requirements.
• adjustable crossover frequency
• adjustable compression ratio from 1:1 to 4:1
The gain and frequency response is dependant on the user’s
environment.
• independent compression ratio adjustment for
low and high frequency band
Twin averaging detector circuits are optimized for sound
quality during normal listening without sacrificing comfort
during sudden loud inputs.
• adjustable AGC threshold levels
• unique twin average detectors
All input signals to DynamEQ® II, are processed by 2:1
compression before subsequent band splitting.
• handles high input levels
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.
• low THD and IMD distortion
• drives class D integrated receivers
• MPO range externally adjustable
The gain setting stage is followed by a class D integrated
receiver preamplifier stage. Symmetrical peak clipping is used
to achieve MPO adjustment.
PACKAGING
• Chip
Au Bump
VB
CSAD
VREG
RTH
8
2
7
18
REGULATOR
1:1
CFAD
1M
1M
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
1
6
85k6
42k8
RLO
RHI
4:1
2:1
5
4
3
GB570
GC570
1
19
CONTROL
RECTIFIER
X
50k
VB
RAGC_IN
48k
RH
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
11
IN
-A
10k
9
14k
12k
GND
10
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
REGIN
-B
-C
20
RL
48k
14
Rƒc
OUT
8k4
Low Frequency
Expander / Compressor
13
12
AOUT
High Frequency
Expander / Compressor
FOUT
15
17
16
BIN
MPO
BOUT
FUNCTIONAL BLOCK DIAGRAM
Document No. 521 - 99 - 00
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: [email protected]
PAD CONNECTION
ABSOLUTE MAXIMUM RATINGS
PARAMETER
CFAD
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
2
CAUTION
CLASS 1 ESD SENSITIVITY
RHI
RLO
3
4:1
2:1
5
6
4
CSAD
7
8
VREG
1:1
1
9
GND
OUT
20
10
AOUT
RTH
19
11
IN
12
REC
VB
18
ELECTRICAL CHARACTERISTICS
17
BOUT
16
15
14
BIN
MPO
FOUT
13
Rƒc
Conditions: Supply Voltage VB = 1.3 V, Frequency = 1 kHz, Temperature = 25°C
PARAMETER
SYMBOL
CONDITIONS
IAMP
IC Current
Minimum Voltage
MIN
-
Vb
TYP
370
MAX
UNITS
530
µA
1.1
-
-
V
Total Harmonic Distortion
THD
VIN = -40dBV at 1kHz
-
0.2
1.0
%
THD with Maximum Allowable Input
THDM
VIN = -23dBV, Rvc = 47kΩ
-
2
10
%
-
3.0
-
µVRMS
Input Referred Noise
IRN
Aweight
Total System Gain
AV
VIN = -90dBV
46
49
52
dB
Regulator Voltage
VREG
ILOAD = 30µA
890
930
1000
mV
AGC
Lower Threshold
THLO
-91
-87
-83
dBV
Upper Threshold
THHI
-36
-32
-28
dBV
Compression Gain Range
∆A
Gain(-90dBVIN) -Gain(-30dBVIN)
37.5
40.5
43.5
dB
A60
VIN =-60dBV
26
29
32
dB
0.9
1.0
1.1
Ratio
3.6
4.0
4.3
Ratio
System Gain in Compression
Min. Compression Ratio
CMP1 :1
VIN=3kHz, -60dBV to -40dBV,
Rhp=1:1 Rlp=1:1
Max. Comp. Ratio
CMP4 :1
VIN =3kHz, -60dBV to -40dBV,
Rhp=4:1, Rlp=4:1
Fast Detector Time Constant
τFAST
-
10
-
ms
Slow Detector Time Constant
τSLOW
-
220
-
ms
3.9
-
kHz
FILTER
Maximum Cross-over Frequency
ƒc_0
Rƒc=0Ω
3.0
Nominal Cross-over Frequency
ƒc_22
Rƒc=22kΩ
1.5
1.9
2.3
kHz
Minimum Cross-over Frequency
ƒc_220
Rƒc=220kΩ
-
0.9
1.4
kHz
-
12
-
dB/oct
dB/oct
Filter Rolloff Rate (GB570)
(GC570)
STAGE A and B
-
24
-
-
-
-
Open Loop Gain (B)
AOL_B
-
52
-
dB
Input Impedance (A)
RIN
8
11
12
kΩ
7
9
11
dB
-14.5
-12.5
-10.5
13
15
17
dB
-
24
-
kΩ
OUTPUT STAGE
Stage Gain
Max Output Level
MPO Range
Output Resistance
AC
MPO
∆MPO
VIN=-30dBV
RVC=220kΩ,VIN=-25dBV
RMPO=0Ω to 50kΩ
ROUT
All conditions and parameters remain as shown in Test Circuit unless otherwise stated in "Conditions" column.
521 - 99 - 00
2
dBV
VB
0µ22
8
10n
2
7
18
REGULATOR
1M
1M
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
5
6
1
85k6
3
4
GB570
GC570
42k8
2µ2
1
19
R
CONTROL
=∞
TH
RECTIFIER
X
50k
VB
RAGC_IN
48k
RH
3.9k
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
11
-A
VIN
0µ2
High Frequency
Expander / Compressor
10k
9
10
20
0µ1
50k
48k
8k4
Low Frequency
Expander / Compressor
13
12
-C
RL
14k
12k
-B
15
17
16
14
Rƒc = 22k
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
0µ1
0µ22
R
R
=0
MPO
=100k
VC
Fig. 1 Production Test Circuit
RHI
200k Linear
RLO
200k Linear
VB
0µ22
REGULATOR
0µ1
RTH
100k
Log
2
7
18
8
10n
1M
1M
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
5
1
6
85k6
42k8
4
3
GB570
GC570
1
19
CONTROL
RECTIFIER
X
50k
VB
VB
RAGC_IN
48k
RH
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
11
-A
0µ2
Any Knowles
or
Microtronics
microphone
High Frequency
Expander / Compressor
10k
9
10
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
12
0µ1
-C
20
RL
13
14
R
ƒc
100k Log
0µ1
2µ2
48k
8k4
Low Frequency
Expander / Compressor
14k
12k
-B
17
16
0µ22
15
Any
Knowles
Class D
receiver
R
MPO
50k
Log
R
VC
100k Log
Fig. 2 Maximum Flexibility Hearing Instrument Application
3
521 - 99 - 00
VB
10n
0µ22
8
2
7
18
REGULATOR
0µ1
1M
1M
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
5
1
6
85k6
42k8
4
3
GB570
GC570
1
19
CONTROL
RECTIFIER
X
50k
VB
VB
RAGC_IN
48k
RH
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
11
-A
0µ2
Any Knowles
or
Microtronics
microphone
High Frequency
Expander / Compressor
10k
9
10
20
0µ1
Any
Knowles
Class D
receiver
48k
8k4
Low Frequency
Expander / Compressor
13
12
-C
RL
14k
12k
-B
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
R
0µ22
0µ1
15
17
16
14
VC
100k Log
Fig. 3 Minimum Component Hearing Instrument Application
RHI1=200k RHI2=0
VB=1.3V
RLO2=0
0µ22
REGULATOR
RLO1=200k
2
7
18
8
10n
1M
1M
SLOW
AVERAGE
DETECTOR
FAST
AVERAGE
DETECTOR
5
6
1
85k6
4
3
GB570
GC570
42k8
2µ2
1
19
CONTROL
RECTIFIER
X
R
VB
50k
=∞
RAGC_IN
TH
48k
RH
12 dB / Oct
(24 dB / Oct)
BAND SPLIT
FILTER
11
-A
3.9k 0µ2
Pink Noise
Generator
or
1kHz for I/O
10k
9
10
12
All resistors in ohms, all capacitors
in microfarads, unless otherwise stated
13
-C
=22k
ƒc
20
RL
0µ1
48k
14
R
0µ1
-B
8k4
Low Frequency
Expander / Compressor
14k
12k
High Frequency
Expander / Compressor
17
16
0µ22
R
50k
15
=100k
VC
R
Fig. 4 Characterization Circuit (Used to generate typical curves)
521 - 99 - 00
4
=0
MPO
TYPICAL PERFORMANCE CURVES
-10
50
VIN = -96dBV
VIN = -80dBV
2:1
3:1
-30
40
VIN = -60dBV
4:1
-40
GAIN (dB)
OUTPUT LEVEL (dBV)
-20
1.5:1
-50
1.2:1
-60
1:1
30
20
VIN = -40dBV
10
VIN = -20dBV
-70
0
-80
-90
-100
-90
- 80
-70
-60
-50
-40
-30
-10
20
-20
50
VIN = -60dBV
RVC = 220kΩ
40
0.8
8
RVC = 100kΩ
7
0.7
30
GAIN (dB)
)
RHI1
20k
Fig. 6 Frequency Response for Different Input Levels
6
0.6
(
RHI1+RHI2
10k
Fig. 5 I/O Transfer function for Different Compression Ratios
9
0.9
5
0.5
0.4
4
RVC = 47kΩ
RVC = 22kΩ
20
RVC = 10kΩ
10
3
0.3
2
0.2
0
0.1
0
0.0
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
-10
20
100
1k
10k
20k
COMPRESSION RATIO (RATIO)
FREQUENCY (Hz)
Fig. 7 Compression Settings Resistor Ratio for High Pass
Channel (RHI1 & RHI2) and Low Pass Channel (RLO1 & RLO2)
Fig. 8 Frequency Response for Different RVC Values
-10
-10
COMPRESSION 1:1
RM PO = 0Ω
-20
-20
RM PO = 10kΩ
OUTPUT LEVEL (dBV)
OUTPUT LEVEL (dBV)
RLO1
1k
FREQUENCY (Hz)
0
1.0
RLO1+RLO2
100
INPUT LEVEL (dBV)
RM PO = 22kΩ
RM PO = 50kΩ
-30
-40
-30
RTH = ∞
RTH = 0Ω
-40
RTH = 10kΩ
-50
RTH = 22kΩ
RTH = 47kΩ
-60
RTH = 100kΩ
-50
-50
-40
-30
-70
-100
-20
-90
-80
INPUT LEVEL (dBV)
Fig. 9
-70
-60
-50
-40
30
-20
INPUT LEVEL (dBV)
I/O Transfer Function for
Fig. 10
Different RMPO Resistors
I/O Transfer Function for
Different RTH Resistors
5
521 - 99 - 00
10000
RH & RL RESISTORS VALUES (kΩ)
198kΩ
100
9kΩ
10
1
-100
-90
-80
-70
-60
-50
-40
30
1.6MΩ
1000
1:1
100
72kΩ
2:1
4:1
15kΩ
10
-100
-20
-90
-80
-70
-50
-40
30
-20
INPUT LEVEL (dBV)
Fig. 11 Stage A Compressor Feedback Resistor Value
Fig. 12 Expander / Compressor Resistors Values
GAIN (dB)
50
50
Crossover
Frequency
Rƒc = ∞
40
40
30
30
20
4:1 in Low Frequency
1:1 in High Frequency
10
Crossover
Frequency
Rƒc = ∞
20
10
4:1 in Low Frequency
1:1 in High Frequency
1:1 in Low Frequency
4:1 in High Frequency
0
0
-10
20
50
1:1 in Low Frequency
4:1 in High Frequency
VIN = -80dBV
100
1k
10k
-10
20
20k
100
20k
Fig. 13 Crossover Frequency Representation
Fig. 14 Crossover Frequency Representation
for GB570 Processor
for GGC570 Processor
50
1:1 in Low Frequency Gain
4:1 in High Frequency
1:1 in Low Frequency Gain
4:1 in High Frequency
40
Rƒc=∞
30
GAIN (dB)
47kΩ
20
22kΩ
10kΩ
10
Rƒc=∞
100kΩ
100kΩ
47kΩ
20
22kΩ
10
0Ω
0Ω
10kΩ
0
0
VIN = -80dBV
100
1k
10k
-10
20
20k
VIN = -80dBV
100
1k
10k
FREQUENCY (Hz)
FREQUENCY (Hz)
521 - 99 - 00
10k
FREQUENCY (Hz)
30
-10
20
VIN = -80dBV
1k
FREQUENCY (Hz)
40
GAIN (dB)
-60
INPUT LEVEL (dBV)
GAIN (dB)
RAG_C RESISTOR VALUE (kΩ)
1000
Fig. 15 GB570 Frequency Response
Fig. 16 GC570 Frequency Response
for Different Rƒc Resistor Values
for Different Rƒc Resistor Values
6
20k
10
10
ƒ= 1 kHz
THD & NOISE (%)
THD & NOISE (%)
VIN = -40dBV
GC570
1
1
GC570
GB570
0.1
100
1000
GB570
0.1
-80
10000
-70
-60
-50
-40
-30
FREQUENCY (Hz)
INPUT LEVEL (dBV)
Fig. 17 THD and Noise vs Frequency
Fig. 18 THD and Noise vs Input Level
-20
10
10
VIN = -40dBV
∆ƒ = 200Hz
ƒ = 4kHz
∆ƒ = 200Hz
IMD (%)
IMD (%)
1
1
GB570
GB570
0.1
GC570
0.1
3000
GC570
10000
0.01
-80
100000
-70
-60
-50
-40
-30
FREQUENCY (Hz)
INPUT LEVEL (dBV)
Fig. 19 Intermodulation Distortion (CCIF) vs Frequency
Fig. 20 Intermodulation Distortion
-20
(CCIF) vs Input Level
GENNUM CORPORATION
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.
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
REVISION NOTES:
GENNUM JAPAN CORPORATION
New Document.
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.
© Copyright September 1998 Gennum Corporation.
All rights reserved.
Printed in Canada.
7
521 - 99 - 00