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GK504のメーカーはGennum Corporationです、この部品の機能は「Low Current Preamplifier」です。 |
部品番号 | GK504 |
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部品説明 | Low Current Preamplifier | ||
メーカ | Gennum Corporation | ||
ロゴ | |||
このページの下部にプレビューとGK504ダウンロード(pdfファイル)リンクがあります。 Total 6 pages
FEATURES
• designed to drive Class D integrated receivers
• adjustable peak clipper
• low current drain
• low noise and distortion
www.DataShee•t4Ulo.cwomexternal parts count
• two low noise preamplifiers
• transconductance output stage
• mid supply referenced output
• preamp A for Gain Trim or Telecoil
STANDARD PACKAGING
• 10 pin MICROpac
• 10 pin PLID®
• 10 pin SLT
• Chip ( 56 x 84 mils)
Au Bump
Low Current Preamplifier
with Output Limiting
GK504 - DATA SHEET
DESCRIPTION
The GK504 is Gennum’s proprietary low current preamplifier
designed to drive the Class D series receivers. It consists of
two independent single-ended, low noise inverting amplifiers,
a symmetrical peak clipping, mid-supply referenced,
transconductance output stage, and an on-chip microphone
decoupling resistor.
Blocks A and B typically have an open loop voltage gain of
53 dB, with the closed loop gain set by the ratio of the feedback
resistor to 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. It is
acceptable to DC-couple blocks A and B of the device,
however the third stage must be AC coupled in order to
maintain DC bias requirements.
The major advantage of the GK504 over other preamplifiers is
the electronic MPO adjustment. Since conventional MPO is
not possible in the class D receivers, it is provided electronically.
The maximum output swing is easily set using an R resistor.
MPO
The receiver output level is thus limited, preventing it from
exceeding the discomfort level.
VMIC 3
R MIC
AIN 2
A
B
RP1
C
RP2
4 VB
5C
OUT
1 10
A OUT BIN
U.S. Patent No.07/354,327
98
BOUT CIN
76
R MPO GND
BLOCK DIAGRAM
Revision Date; May 1998
Document No. 520 - 47 - 05
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 3
VIN DC
IBIAS
2
RMIC
A
B
4 VB=1.3 VDC
RP1
IAMP
C
5 0µ1
VOUT
RP2
www.DataSheet4U.com
RF=0
1
IL=0
10 9
I BIAS
RF=0
VINDC
IL=0
8
1µ0
76
RMPO=10k
VINAC=
0VRMS
1kHz
All resistors in ohms, all capacitors in µF, unless otherwise stated.
RL
50k
Fig. 1 Test Circuit
RMIC
3
BASE CURRENT
COMPENSATION
2
9
1
10
2.5k
All resistors in ohms, all capacitors in µF, unless otherwise stated.
7
33k
8
Fig. 2 Functional Schematic
4
48k
5
48k
6
3 520 - 47 - 05
3Pages 10
-10
-30
-50
-70
-90
-110
-130
www.DataSheet4U.com 1
10 100 1k
R
MPO
(Ω)
10k 100k
Fig. 10 Change in Supply Current vs RMPO
-10
-14
-18
-22
-26
-30
-34
-38
-42
0 10 100 1k 10k 100k
RMPO (Ω)
Fig. 12 Maximum Output vs RMPO
(as in Fig. 1, VINAC= -15dBV)
-12
-16
-20
-24
-28
-32
-36
-50
55
-40 -30
-20
INPUT (dBV)
-10
Fig. 11 I/O for Amplifier C
(as in Fig. 1)
0
50
1M 1M
10µ
45
1.3V
2.2k 10µ
PREAMP
VOUT
40 VAC
35
10 100 1k
10k
FREQUENCY (Hz)
Fig. 13 Preamplifiers A and B
Open Loop Voltage Gain
100k
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:
Updated to Data sheet
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 July 1990 Gennum Corporation. All rights reserved.
520 - 47 - 05
6
Printed in Canada.
6 Page | |||
ページ | 合計 : 6 ページ | ||
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データシートを活用すると、その部品の主な機能と仕様を詳しく理解できます。 ピン構成、電気的特性、動作パラメータ、性能を確認してください。 |
部品番号 | 部品説明 | メーカ |
GK504 | Low Current Preamplifier | Gennum Corporation |
GK509 | Class A Amplifier | Gennum |