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| Telecoil Preamplifier GC562 - DATA SHEET FEATURES * direct coupled telecoil preamplifier * natural low frequency rolloff to reduce 50/60 Hz hum pickup * low current consumption (typ 65 A) * 34 dB maximum gain STANDARD PACKAGING * Chip (28 x 56 mils) Au Bump DESCRIPTION The GC562 was designed to allow direct coupling of the telecoil onto the preamplifier without the need of a capacitor. The DC bias voltage at the output of the unity gain, inverting preamplifier B, precisely matches that of the input of preamp A. When the telecoil is placed between these two pins, no DC current will flow through the coil as the potential at both ends is equal. With stage B configured as unity gain, its output appears as a virtual ground to AC signals. The lower -3 dB corner frequency of the amplifier is set by the ratio of the telecoil resistance to the inductance, given by the equation: RCOIL L = (2 LCOIL) With a gain set resistor from the input to output of preamplifier A, a signal inductively coupled into the telecoil via the telephone will produce a signal current to flow through the resistor, thereby producing a voltage at the output of the amplifier. For stability reasons it is recommended that the telecoil amplifier not be configured for more than 34 dB gain, or with a feedback resistor larger than 100 k. VB 2 TREF 1 B TIN 3 -A 4 TOUT 5 GND FUNCTIONAL BLOCK DIAGRAM Revision Date: September 1999 Document No. 520 - 93 - 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 Storage Temperature Range VALUE / UNITS 5 VDC 25 mW -10 C to 40 C -20 C to 70 C CHIP PIN CONNECTION TREF 1 VB 2 TIN 3 6 CAUTION CLASS 1 ESD SENSITIVITY 5 GND 4 TOUT TREF ELECTRICAL CHARACTERISTICS Conditions: Frequency = 1 kHz, Temperature = 25C, Supply Voltage V = 1.3 V B PARAMETER DC SPECIFICATIONS Amplifier Current Telecoil Offset Voltage Input Bias Current Stage A Source Current Stage B Source Current Output Voltage Swing-Low (Stage A) AC SPECIFICATIONS TREF Output Impedance Input Referred Noise SYMBOL CONDITIONS MIN TYP MAX UNITS IAMP TVOFF I BIAS ISRC_A ISRC_B VOL VP1 - VP3 40 -4 10 15 7 50 65 0 100 30 15 300 100 4 200 - A mV nA A A mV Z OUT IRN at < 5kHz NFB 0.2 to 10kHz at 12dB/oct - 200 1.5 - VRMS All parameters and switches remain as shown in the Test Circuit unless otherwise stated in CONDITIONS column VPX - actual voltage measured on the pin at given condition (X is pin number). VB=1.3V 2 1 B 1k 3 -A 4 10 VOUT 10 5 100k All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 1 Test Circuit 520 - 93 - 02 2 2 1 4 3 5 Fig. 2 Functional Schematic Diagram VB 4 10 2 MIC 21k 01 1 B 3k3 3 -A 4 100 3 -A 6 7 TCOIL REC ED1915 4k 5 -B GP509 1 8 2 GC562 5 10k 100k VC All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 3 Typical Hearing Instrument Application VB=1.3V 2 1k H99966 1 B 3 -A 4 VOUT 5 10k All resistors in ohms, all capacitors in farads unless otherwise stated. Fig. 4 Characterization Circuit 3 520 - 93 - 02 -10 -20 20 19 OUTPUT (dBV) -30 -40 -50 -60 -70 -80 -90 -100 -140 -120 -100 -80 -60 -40 -20 14 10 100 1k 10k 100k 18 GAIN (dB) 17 16 15 INPUT (dBV) FREQUENCY (Hz) Fig. 5 I/O Curve 20 18 16 14 12 64 Fig. 6 Frequency Response OPEN LOOP VOLTAGE GAIN (dB) 56 48 40 32 24 2.2k 10 PREAMP THD (%) 10 8 6 4 2 0 -100 -90 -80 -70 -60 -50 -40 -30 1M 1M 10 1.3V VOUT 16 VAC 8 0 10 100 1k 10k 100k INPUT (dBV) FREQUENCY (Hz) Fig. 7 THD vs Input Fig. 8 Stage A Open Loop Voltage Gain 8 PIN DIP PINOUT (For Evaluation Purposes) TREF 8 VB 7 TIN 6 NC 5 1 2 3 4 NC GND TOUT NC 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: Added Au Bump. 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 APRIL 1993 Gennum Corporation. All rights reserved. Printed in Canada. 520 - 93 - 02 4 |
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