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