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PDF GK509 Data sheet ( Hoja de datos )
| Número de pieza | GK509 | |
| Descripción | Class A Amplifier | |
| Fabricantes | Gennum | |
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Hay una vista previa y un enlace de descarga de GK509 (archivo pdf) en la parte inferior de esta página. Total 5 Páginas | ||
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Class A Amplifier with 2 DC Coupled
Gain Blocks & Schottky Diodes
GK509 DATA SHEET
FEATURES
• 100 µA typical current drain
• low noise and distortion
• 1.0 to 5 VDC operating range
• DC coupled stages
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• Class A output stage
• Schottky diodes for MPO control
• variable transducer current
• 4 kΩ microphone decoupling resistor
STANDARD PACKAGING
• 8 pin PLID®
• Chip ( 61 x 55 mils)
VMIC
5
RMIC
DESCRIPTION
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.
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.
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
emitter resistor (RE). To increase the bias current in the
transducer, simply place an external RE resistor from pin 2
to ground, thereby decreasing the equivalent emitter resistance
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.
VB
6
MPO
7
21K
A IN
4
-A
-B
RE
B OUT
8
2 RE
31
A OUT
GND
All resistors in ohms, all capacitors in farads unless otherwise stated
Revision Date: January 2001
BLOCK DIAGRAM
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: [email protected]
1 page  
4
CS = 0.22
0
CS = 0.1
-4
-8 CS = 0.047
-12
CS = 0.033
-16
-20
20
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200 2K
FREQUENCY (Hz)
20K
Fig. 6 Closed Loop Frequency Response
with Various CS Values
10
0
-10
-20
-30
-40
-50
-60
0.6 0.7 0.8 0.9 1 1.1 1.2 1.3 1.4
SUPPLY VOLTAGE (V)
Fig. 7 Gain vs Supply Voltage
25
20
15
10
5
0
-5
-10
-15
-20
-25
-30-20 -10 0 10 20 30 40
-35 TEMPERATURE (oC)
Fig. 8 Amplifier Current vs Temperature
50
20
15
10
5
0
-5
-10
-15
-20
-20
-10
0 10 20 30
TEMPERATURE (oC)
40
Fig. 9 Transducer Current vs Temperature
50
60
55
50
45
40
35
30
25
20
10
100 1K
FREQUENCY (Hz)
10K
100K
Fig. 10 Preamplifer Open Loop
Frequency Response
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
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
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 Corporation assumes no responsibility for the use of any circuits described herein and makes no representations that they are free from patent infringement.
© Copyright October 1987 Gennum Corporation. All rights reserved.
5
Printed in Canada.
510 -69 - 06
5 Page | ||
| Páginas | Total 5 Páginas | |
| PDF Descargar | [ Datasheet GK509.PDF ] | |
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