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| www..com V.C. Preamp Hybrid for Class D GS3015 - HYB DATA SHEET FEATURES * Gennum's GL504 preamp * mounts on back of Microtronic PJ88S VC Socket * low external parts count * designed to drive Class D integrated receivers * adjustable peak clipper * low current drain (150 A) typical * low noise and distortion DESCRIPTION The GS3015 incorporates Gennum's GL504 preamp, three of the required capacitors and a mid supply referencing 48K resistor. All that is required for a fully functional hearing aid system is the addition of a microphone, receiver, volume control, interstage coupling capacitor and an MPO adjusting potentiometer. The GS3015 has been designed to mount on the back of the Microtronics PJ88S Socket Volume Control. This translates to a saving in space within the hearing instrument, as the circuitry mounts directly beneath the volume control. If the VC requires replacing, it is a simple procedure to remove the defective unit from the socket and install a new device. This does not disturb the electronic circuitry. The major advantage of the GL504 over other preamplifiers is the electronic MPO adjustment. Since conventional MPO is not possible in a class D receiver, Gennum provides it in the preamp. STANDARD PACKAGING * Hybrid Typical Dimensions 0.192 in x 0.194 in x 0.113 in (4.88 mm x 4.93 mm x 2.85 mm) 10 VB RMIC VMIC 2 C1 6 33 7 RPULL C3 47n 8 1 BOUT 4 VREC AIN 11 C2 47n -A 5 -B R1 48K 4 3 1 2 3 CIN 6 CT 5 7 AOUT BIN 8 GND MPO 9 GS3015 HYBRID All resistors in ohms, all capacitors in farads unless otherwise stated BLOCK DIAGRAM Revision Date: May 1998 Document No. 520 - 92 - 05 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 Storage Temperature Range VALUE/UNITS 3 V DC 25 mW -10C to +40 C -20C to +70 C BIN CAUTION CLASS 1 ESD SENSITIVITY MPO CT PIN CONNECTION AOUT VREC 5 6 4 3 CIN 7 2 VMIC 8 9 GND 10 VB TOP VIEW 11 AIN 1 BOUT ELECTRICAL CHARACTERISTICS Conditions: Frequency = 1 kHz, Temperature = 25C PARAMETER Amplifier Current System Gain Maximum Output MPO Range Input Referred Noise Distortion On Chip Pull-up Resistance On Chip Microphone Resistor Mic Decoupling Capacitor Input Coupling Capacitor Output Coupling Capacitor Output Resistor Output Impedance (Pad 1) SYMBOL IAMP AV MPO MPO IRN THD RPULL RMIC C1 C2 C3 R1 R OUT CONDITIONS V IN = 0, RMPO = 0 V IN = -80 dBV, R MPO = 0, Freq.= 5 kHz V IN = -50 dBV, R MPO = 0 V IN = -50 dBV, R MPO = 10 k NFB 0.2 to 10 kHz at 12 dB/oct MIN 75 44.5 -16 10 -20% -10% -10% -5% - TYP 150 46.5 -14 12 2 <1.0 48 4 3.3 0.047 0.047 48 MAX 225 48.5 -12 14 +20% +10% +10% +5% UNITS A dB dBV dB VRMS % k k F F F k 24 - k All parameters and switches remain as shown in Test Circuit unless otherwise stated in "Conditions" column 520 - 92 - 05 2 10 RMIC 2 C1 6 33 7 RPULL C3 47n 1 8 4 IAMP VOUT 1.3 VDC 11 3.92K C2 47n -A 5 -B V IN 1kHz R1 48K 4 3 1 2 3 6 5 7 9 8 GS3015 HYBRID RMPO=10K RFA=100K 47n All resistors in ohms, all capacitors in farads unless otherwise stated Fig.1 Production Test Circuit 1.3 VDC 10 RMIC 2 C1 6 33 7 RPULL C3 47n 1 8 1 R1 48K 4 3 1 2 4 VC SWITCH MIC 11 C2 47n -A 5 -B CLASS D INTEGRATED RECEIVER 3 6 5 47n VC 7 9 8 GS3015 HYBRID RMPO 10K All resistors in ohms, all capacitors in farads unless otherwise stated Fig. 2 Typical Hearing Instrument Application 3 520 - 92 - 05 -15 -25 -35 -10 -15 RVC=100K -20 R MPO=0 R MPO=3.3k OUTPUT (dBV) OUTPUT (dBV) -45 -55 -65 -25 -30 -35 -40 -45 -50 -100 R VC=33K R VC=10K RMPO=10k RVC=3.3K -75 -85 -95 -140 -120 -100 -80 -60 -40 -20 -90 -80 -70 -60 -50 -40 -30 -20 INPUT (dBV) INPUT (dBV) Fig. 3 I / O for Various RVC Values Fig. 4 I / O for Various R MPO Values 2 0 -2 10 9 8 RELATIVE OUTPUT (dB) -4 -6 -8 -10 -12 -14 -16 -18 -20 20 200 2K 20K C=0 C=0.1 THD (%) 7 6 5 4 3 2 1 0 -90 -86 -82 -78 -74 -70 -66 -62 -58 C=0.22 FREQUENCY (Hz) INPUT (dBV) Fig. 5 Frequency Response for Various C||C2 Values Fig. 6 Distortion vs Input Level (RVC=100k) 0 RELATIVE AMPLIFIER CURRENT (A) -10 -20 -30 -40 -50 -60 -70 -80 -90 0 5 10 15 20 25 30 RMPO (k) Fig. 7 Relative Amplifier Current vs MPO Resistance 520 - 92 - 05 4 -10 -14 -18 -22 55 No Load 50 OUTPUT (dBV) -30 -34 -38 50K Load GAIN (dB) -26 45 40 -42 -46 -50 0 10 100 1K 10K 100K 35 10 100 1K 10K 100K RMPO () FREQUENCY (Hz) Fig. 8 Output vs MPO Resistance Fig. 9 Preamplifier A Open Loop Voltage Gain TOP VIEW 5 6 0.194 (4.93) 4 3 7 XXXXXX 9 10 0.192 (4.88) 11 3015 2 8 1 0.063 MAX (1.60) 11 C3 1 0.080 MAX (2.03) 0.123MAX (3.13) 8 9 10 7 C1 6 C2 3 2 5 4 Dimensioning units are inches. Dimensions shown in parenthesis are in millimetres, converted from inches and include minor round off errors 1.0000 inches = 25.4mm. Minimum pad size 0.015in x 0.025in (0.38mm x 0.64mm). BOTTOM VIEW Pad numbers & capacitor numbers for illustration only. Dimensions tolerances:+0.013in -0.002in (+0.33mm -0.05mm) unless otherwise stated. XXXXXX - work order number. Fig. 10 Hybrid Layout and Dimensions 5 520 - 92 - 05 |
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