CIC, Class D Hybrid GS3024A - DATA SHEET FEATURES DESCRIPTION • small outline for CIC applications The GS3024A is a Gennum proprietary hybrid for CIC applications. It incorporates a newly designed integrated circuit which offers optimum performance in class D receiver applications. • designed to drive class D integrated receivers • on chip voltage regulator for improved end of battery life operation The system consists of a voltage regulator, a single low noise inverting preamplifier and a mid supply referenced output stage. The voltage regulator provides a clean DC voltage for the microphone and preamplifier, so that at end of battery life conditions when the output impedance of the battery is high, the system maintains stable operation. The preamplifier and output stage have been optimally compensated to minimize aliasing effects normally associated with class D operation. The two stages have been DC coupled to reduce the external components required, thereby minimizing the hybrid footprint. • adjustable symmetrical peak clipper for MPO control • low current drain (150 µA typical) STANDARD PACKAGING • Hybrid Typical Dimensions 0.145 in. x 0.085 in. x 0.065 in. (3.68 mm x 2.16 mm x 1.65 mm) The hybrid incorporates a decoupling capacitor for the regulator as well as input and output coupling capacitors for the microphone and receiver. In a minimum parts configuration, a microphone, receiver and gain set resistor, need to be added to the hybrid for a fully functional hearing instrument. Should the application require the Maximum Power Output (MPO) to be adjusted, a potentiometer can be added from pad 6 of the hybrid to ground. REGULATOR VREG 4 1 VB C1 0µ1 50kΩ IN 5 -A -B C2 0µ1 C3 22n 8 OUT 50kΩ GS3024A 3 AIN 2 6 7 AOUT MPO GND All resistors in ohms, all capacitors in farads unless otherwise stated. BLOCK DIAGRAM Revision Date: May 1998 Document No. 521 - 24 - 03 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] PIN CONNECTION ABSOLUTE MAXIMUM RATINGS PARAMETER VALUE & UNITS Supply Voltage 3 V DC Power Dissipation 25 mW OUT 8 Operating Temperature -10 to + 40 °C Storage Temperature -20 to +70 °C CAUTION GND 7 MPO IN 6 5 1 2 3 4 VB AOUT AIN VREG CLASS 1 ESD SENSITIVITY ELECTRICAL CHARACTERISTICS Conditions: Supply Voltage VB = 1.3VDC, Temperature 25 oC, Frequency = 1 kHz. PARAMETER SYMBOL CONDITION MIN TYP MAX UNITS Amplifier Current IAMP 80 150 220 µA Regulator Voltage VREG 0.87 0.92 0.97 V Regulator Power Supply Rejection PSRR - 63 - dB Input Referred Noise IRN - 2 - µVRMS NFB at 200 Hz to 10 kHz STAGE A Input Bias Voltage VBIAS 500 570 630 mV Input Bias Current IBIAS -25 0 25 nA Output Voltage Swing Low VOL 200 250 - mV Open Loop Voltage Gain AOL At DC 46 53 - dB Maximum Output Level MPO VIN = -50 dBV -14.5 -12.5 -10.5 dBV MPO Range ∆MPO VIN = -50 dBV, RMPO = 50 kΩ 14 16 18 dB Output Impedance ROUT 20 25 30 kΩ 40 42 44 dB - 0 2.5 dB STAGE B SYSTEM AC Voltage Gain GAIN VIN = -66 dBV Change in Gain ∆GAIN RMPO = 100 kΩ VIN = -78 dBV All conditions and parameters remain as shown in test circuit unless stated in "conditions " column. 521 - 24 - 03 2 1.3VDC REGULATOR 4 1 C1 0µ1 50kΩ 3k9 5 -A VOUT 8 -B C2 0µ1 VIN 1kHz 0dBV C3 22n 50k 50kΩ GS3024A 2 3 100k 6 7 RMPO=0Ω All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 1 Production Test Circuit VB REGULATOR 4 1 C1 0µ1 50kΩ EM3046 or MODEL 39 5 -A -B C2 0µ1 C3 22n ES3127 8 2µ2 50kΩ GS3024A 3 2 6 7 RVC 100k All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 2 Typical Hearing Instrument Application (Minimum Parts Configuration) 3 521 - 24 - 03 BATTERY - RVC 4 3 2 5 6 7 + 1 + + MIC REC 8 EM3046 or MODEL 39 ES3127 2µ2 Fig. 3 Typical Instrument Assembly Diagram (Minimum Parts Configuration) 1.3VDC REGULATOR 4 1 C1 0µ1 50kΩ 3k9 5 VIN -A C3 22n C2 0µ1 50k 50kΩ GS3024A 3 2 6 RVC 100k RMPO=0Ω All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 4 Characterization Circuit (Used to generate typical curves) 521 - 24 - 03 4 VOUT 8 -B 7 -10 -15 -10 R VC = 100k -25 R MPO=10k -20 OUTPUT (dBV) -35 OUTPUT (dBV) R MPO=0Ω RMPO=3.3k -15 R VC = 33k -45 RVC = 10k -55 -65 RVC = 3.3k -75 R MPO=22k -25 R MPO=50k -30 -35 -40 -45 -85 -50 -95 -140 -120 -100 -80 -60 -40 -20 -90 -80 -70 -60 INPUT (dBV) Fig. 5 I/O for Various R VC Settings -30 -20 10 9 -2 RVC =10k -4 8 7 RVC=50k RVC =100k -6 THD (%) RELATIVE OUTPUT (dBV) -40 Fig. 6 I/O for Various RMPO Settings 1 0 -8 6 5 4 -10 3 -12 2 -14 1 -16 100 1k 10k 0 20k -90 -86 -82 -78 FREQUENCY (Hz) -74 -70 -66 -62 -58 -54 INPUT (dBV) Fig. 8 Distortion vs Input Level (RVC = 100 kΩ) Fig. 7 Frequency Response for Various RVC Values 5 2 0 0 -5 -2 RELATIVE OUTPUT (dBV) RELATIVE AMPLIFIER CURRENT (µA) -50 INPUT (dBV) -10 -15 -20 -25 -30 -35 -40 -45 -4 -6 -8 -10 -12 -14 -16 -18 -50 -20 -55 -22 -24 -60 0 10 100 R MPO 1k 10k 100k 0 10 100 1k 10k 100k RMPO (Ω) (Ω) Fig. 9 Quiescent Current vs MPO Resistance Fig. 10 Output vs MPO Resistance 5 521 - 24 - 03 -58 54 50 -59 46 42 38 GAIN (dB) PSRR (dB) -60 -61 -62 34 30 26 22 -63 18 14 -64 100 1k 10k 10 100k 10 100 FREQUENCY (Hz) 1k 10k 100k FREQUENCY (Hz) Fig. 11 Regulator Power Supply Rejection Ratio Fig. 12 Preamplifier A Open Loop Frequency Response 0.145 (3.68) 0.085 (2.16) XXXXXX 0.070 MAX (1.78) 8 7 1 2 6 3 5 Dimensioning units are inches. Dimensions shown in parenthesis are in millimetres, converted from inches and include minor round off errors. 1.0000 inches = 25.400mm Minimum Pad size 0.021 x 0.030 (0.53 x 0.76) Dimension tolerances ±0.003 (±0.08) unless otherwise stated. Pad numbers and capacitor numbers for illustration only. This hybrid is designed for point to point manual soldering. 4 Fig. 13 Hybrid Layout and Dimensions 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 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 January 1995 Gennum Corporation. All rights reserved. 521 - 24 - 03 6 Printed in Canada.