GC562 DATA SHEET FEATURES direct coupled telecoil preamplifier na

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GC562 DATA SHEET FEATURES direct coupled telecoil preamplifier na

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Telecoil Preamplifier
GC562 DATA SHEET
FEATURES direct coupled telecoil preamplifier natural frequency rolloff reduce 50/60 pickup current consumption (typ maximum gain STANDARD PACKAGING Chip mils) Bump DESCRIPTION GC562 designed allow direct coupling telecoil onto preamplifier without need capacitor. bias voltage output unity gain, inverting preamplifier precisely matches that input preamp When telecoil placed between these pins, current will flow through coil potential both ends equal. With stage configured unity gain, output appears virtual ground signals. lower corner frequency amplifier ratio telecoil resistance inductance, given equation: RCOIL LCOIL) With gain resistor from input output preamplifier signal inductively coupled into telecoil telephone will produce signal current flow through resistor, thereby producing voltage output amplifier. stability reasons recommended that telecoil amplifier configured more than gain, with feedback resistor larger than
TREF
TOUT
FUNCTIONAL BLOCK DIAGRAM
Revision Date: September 1999
Document
GENNUM CORPORATION P.O. 489, Stn. Burlington, Ontario, Canada tel. (905) 632-2996 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 -10° -20°
CHIP CONNECTION TREF
CAUTION CLASS SENSITIVITY
TOUT
TREF
ELECTRICAL CHARACTERISTICS
Conditions: Frequency kHz, Temperature 25°C, Supply Voltage
PARAMETER SPECIFICATIONS Amplifier Current Telecoil Offset Voltage Input Bias Current Stage Source Current Stage Source Current Output Voltage Swing-Low (Stage SPECIFICATIONS TREF Output Impedance Input Referred Noise
SYMBOL
CONDITIONS
UNITS
IAMP TVOFF BIAS ISRC_A ISRC_B
5kHz 10kHz 12dB/oct
parameters switches remain shown Test Circuit unless otherwise stated CONDITIONS column actual voltage measured given condition number). VB=1.3V
VOUT
100k
resistors ohms, capacitors farads unless otherwise stated.
Fig. Test Circuit
Fig. Functional Schematic Diagram
TCOIL ED1915
GP509
GC562
100k
resistors ohms, capacitors farads unless otherwise stated.
Fig. Typical Hearing Instrument Application
VB=1.3V
H99966
VOUT
resistors ohms, capacitors farads unless otherwise stated.
Fig. Characterization Circuit
OUTPUT (dBV)
-100 -140 -120 -100 100k
GAIN (dB)
INPUT (dBV)
FREQUENCY (Hz)
Fig. Curve
Fig. Frequency Response
OPEN LOOP VOLTAGE GAIN (dB)
2.2k
PREAMP
-100
1.3V VOUT
100k
INPUT (dBV)
FREQUENCY (Hz)
Fig. Input
Fig. Stage Open Loop Voltage Gain
PINOUT
(For Evaluation Purposes) TREF
TOUT
GENNUM CORPORATION
MAILING ADDRESS: P.O. 489, Stn. Burlington, Ontario, Canada Tel. (905) 632-2996 (905) 632-2814 SHIPPING ADDRESS: Fraser Drive, Burlington, Ontario, Canada
DOCUMENT IDENTIFICATION: DATA SHEET product production. Gennum reserves right make changes time improve reliability, function design, order provide best product possible. REVISION NOTES:
Added Bump.
GENNUM JAPAN CORPORATION
C-101, Miyamae Village, 2-10-42 Miyamae, Suginami-ku, Tokyo 168-0081, Japan Tel. 3334-7700 Fax: 3247-8839
Gennum Corporation assumes responsibility circuits described herein makes representations that they free from patent infringement. Copyright APRIL 1993 Gennum Corporation. rights reserved.
Printed Canada.

GC562 DATA SHEET FEATURES direct coupled telecoil preamplifier na

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