1

500 - 15 - 09

NOT

RECOMMENDED

FOR

NEW

DESIGNS

LIMITER

100

-

+

1

5

4

8

33k

200

RE

2.2k

6

3

2

7

GND

VC

OUT

IN

VB

MICBIAS

GENNUM CORPORATION P.O. Box 489, Stn A, Burlington, Ontario, Canada L7R 3Y3

tel. (905) 632-2996 fax: (905) 632-5946

Japan Branch: A-302, M i yamae Vi l l age, 2–10–42 M i yamae, Sugi nami–ku, Tokyo 168, Japan

tel. (03) 3334-7700

fax (03) 3247-8839

High Gain Class A Amplifier

DESCRIPTION

The LC/LD505 are low voltage, linear monolithic integrated

amplifiers with a typical electrical gain of 71 dB. The circuits

are comprised of a compensated, unconditionally stable,

operational amplifier and a low distortion Class A single

transistor output stage with negative feedback for stability

over a wide temperature range.

Current trimming in the output stage for inductive or resistive

loads can be accomplished by connecting an emitter resistor

from RE to ground. The LC/LD505 can operate over a supply

voltage range of 1.0 to 1.6 DC.

The LD505 which is an eight pin device, has an internal 2.2 k

Ω

decoupling resistor for microphone bias providing increased

supply line rejection. The base of the output transistor is also

accessible allowing connection of diodes in a feedback

configuration for peak limiting.

Document No. 500 - 15 - 09

LC505/LD505 DATA SHEET

GENNUM

C

O

R

P

O

R

A

T

I

O

N

STANDARD PACKAGING

• MINIpac P6 (LC505)

• MINIpac P8 (LD505)

FEATURES

• 71 dB of gain with 1.3 V supply

• 0.2 to 2.0 mA of transducer current adjustment

• 43 dB of volume control range

• 1.0 to 1.6 V supply operating range

• 2.2 k

bias (LD505 only)

• output limiting capabilities (LD505 only)

RE

100

-

+

4

3

33k

200

VB

5

2

1

6

IN

GND

VC

OUT

Revision Date: January 1996

All resistors in ohms, all capacitors in

microfarads unless otherwise stated

All resistors in ohms, all capacitors in

microfarads unless otherwise stated

LD505 BLOCK DIAGRAM

LC505 BLOCK DIAGRAM