Datasheet > GK509

GK509

更新时间： 2024-11-27 21:54:19

品牌	Logo	应用领域
其他 - ETC		肖特基二极管放大器
页数	文件大小	规格书
5页	89K
描述
Class A Amplifier with 2 DC Coupled Gain Blocks and Schottky Diodes

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GK509 数据手册

Class A Amplifier with 2 DC Coupled

Gain Blocks & Schottky Diodes

GK509DATASHEET

FEATURES

DESCRIPTION

• 100 µA typical current drain

• low noise and distortion

The GK509 is a Class A amplifier utilizing Gennum’s

proprietary low voltage JFET technology. It consists of a

single-ended, low noise inverting gain block, a Class

A output stage, an on-chip microphone decoupling

resistor, and a pair of Schottky diodes for symmetrical

peak clipping.

• 1.0 to 5 VDC operating range

• DC coupled stages

• Class A output stage

Block A typically has an open loop voltage gain of 56 dB,

with the closed loop gain set by the ratio of the feedback

resistor to the source impedance. It is recommended that

the maximum closed loop gain be 20 dB lower than the

open loop gain. All blocks of the device are internally bias

compensated, preventing any DC current flow via external

feedback resistors. Without this compensation audible

scratchiness would be present during changes in volume

control settings.

• Schottky diodes for MPO control

• variable transducer current

• 4 kΩ microphone decoupling resistor

STANDARD PACKAGING

• 8 pin PLID^®

The output stage of the GK509 is a Class A current drive.

It has a fixed reference voltage of typically 30 mV at pin 2

of the device. The current that flows in the transducer is the

ratio of the 30 mV reference voltage and the on-chip

• Chip ( 61 x 55 mils)

emitter resistor (R ). To increase the bias current in the

transducer, simply place an external R_Eresistor from pin 2

toground,therebydecreasingtheequivalentemitterresistance

and increasing the current.

The GK509 also contains a pair of Schottky diodes in the

feedback configuration of the output stage, which provides

approximately 12 dB of MPO control.

MIC

MPO

21K

B OUT

- A

- B

A IN

A OUT

GND

All resistors in ohms, all capacitors in farads unless otherwise stated

BLOCK DIAGRAM

Revision Date: January 2001

Document No. 510 - 69 -06

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

12 3 4 5

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