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Low Current, Peak Limiting Class A Amplifier
LT505 DATA SHEET
FEATURES * amplifier current typically 53 A * transducer current typically 210 A * Schottky diodes provide peak limiting * low parts count * gain 74dB typically with 1.3 V supply
DESCRIPTION The LT505 is a low current, low voltage monolithic integrated circuit amplifier. It is comprised of an operational amplifier driving a single transistor class A output stage with open collector. Also included is a pair of complementary Schottky diodes which, when shunted across the load, provide the capability for symmetrical peak clipping. The input stage is biased by an external 200 k resistor. It is important that this resistor be 1% tolerance for optimum performance. An internal negative feedback loop ensures a stable operating point for the output stage over the designed operating voltage. Because of the lowered idle current, trimming the output current with the use of a single external resistor is not recommended for the LT505. The typical gain for this IC is 74 Due to low power consumption dB. this part is the perfect choice for the output stage of class A hearing instruments.
STANDARD PACKAGING * 8 Pin PLID(R) * chip ( 56 x 55 mils)
BLOCK DIAGRAM
VMIC 8 2.2K O/P 3 6 I/P VB 4 MPO 8 1 2.2 K
EQUIVALENT CIRCUIT
4 1
+ _
33K 100 200 5
6 3 27 K 100 33 K 2 200 7 GND RE U.S. Patent No. 4,034,306 Patented in other countries 2 5 7
RVC
All resistors in ohms, all capacitors in F unless otherwise stated
Revision Date: January 2001
Document No. 500 - 45 - 10
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 VALUE/UNITS 3 V DC 25 mW -10C to 40 C VB O/P RE MPO CAUTION CLASS 1 ESD SENSITIVITY
PIN CONNECTION
4
5
RVC I/P GND
1
8
VMIC
ELECTRICAL CHARACTERISTICS
All switches remain as shown in test circuit unless stated in conditions column. Conditions : VCC = 1.30 VDC , temperature 25 C
PARAMETER Gain Total Harmonic Dist. Amplifier Current Transducer Current Total Current Input Referred Noise Volume Control Range Battery Resist.Stability Input Impedance (Pin 6) Maximum Output
SYMBOL
CONDITIONS VOUT = 200 mVRMS VOUT = 200 mVRMS
MIN 70 44 130 174 -
TYP 74 2.0 53 210 263 1.4 47 15 0.240
MAX 78 5.0 62 260 322 2.2 0.310
UNITS dB % A A A VRMS dB k VRMS
IA IL IA+ IL
RVC = 0 to 56.2 k (S1 -ON/OFF) RB= 22
36 22 -
VIN = 0.5 m VRMS (S2 - closed)
0.165
V = 1.3 VDC B
RB = 4.7
S2
1.1 6K
V O
+
2.2 200 k 8 4 2.2 K 3 6 HAMMOND 99966 1
R = 3.9 K S
0.33
+ _
33 K 100
1 kHz 50 + 10
S1 5 R = 56.2 K VC
200 7 2
All external resistors in ohms, all capacitors in F unless otherwise stated
Fig. 1 Test Circuit
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:
Changes to standard packaging information.
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 1982 Gennum Corporation. All rights reserved.
Printed in Canada.
500 - 45 -10
2

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