GL504 [ETC]
GL504 - Low Current Preamplifier with Output Limiting ; GL504 - 低电流前置放大器，输出限制\n
| 型号： | GL504 |
| 厂家： | 
ETC |
| 描述： | GL504 - Low Current Preamplifier with Output Limiting
|
| 文件： | 总5页 (文件大小：80K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Low Current Preamplifier
with Output Limiting
GL504 - DATA SHEET
DESCRIPTION
FEATURES
The GL504 is a low current preamplifier designed to drive
the class D series of integrated receivers. This preamp has a
built-in symmetrical peak clipping output limiter, 46 dB of
adjustable gain, and requires few external components.
• designed to drive class D integrated receivers
• MPO range externally adjustable
• 150 µA typical current drain
• 46 dB of adjustable gain
Composed of two stages, an inverting preamp with gain of
28 dB, and a transconductance block with gain of 18 dB, the
GL504 is easily configured for mid-supply reference as
required by the class D receivers.
• low external parts count
STANDARD PACKAGING
• 8 Pin MICROpac
• 8 Pin PLID®
• 8 Pin SLT
The two stages of the GL504 must be AC coupled in order to
maintain the DC bias conditions of each stage. Also, a 48
kΩ resistor, between the output and ground, is used to keep
the receivers at mid-supply reference. The minimal total parts
count, excluding an MPO variable resistor, requires 3
capacitors, a 100 kΩ volume control and the 48 kΩ bias
resistor at the output.
• Chip (56 x 56 mils)
Au Bump
The GL504 is capable of providing a flat frequency response
with very little distortion.
R
MIC
7
V
R
6
5
MIC
B
R
PULL
A
8
B
IN
OUT
B
A
R
CLIP
1
4
3
2
U.S. Patent No. 07/354,327
A
OUT
B
GND
MPO
IN
BLOCK DIAGRAM
Document No. 510 - 99 - 06
Revision Date: May 1998
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
PIN CONNECTION
PARAMETER
VALUE / UNITS
AOUT
BIN
5
AIN
4
Supply Voltage
5 V
-10°C to +40°C
-20°C to +70°C
RMIC
Operating Temperature
Storage Temperature
MPO
GND
VB
1
8
BOUT
CAUTION
Class 1 ESD Sensitivity
ELECTRICAL CHARACTERISTICS (refer to test circuit) Supply Voltage = 1.3 V, Test Frequency 1kHz
PARAMETER
Amplifier Current
Microphone Resistance
Input Referred Noise
Gain
SYMBOL
IAMP
CONDITIONS
RMPO = 0
MIN
75
TYP
150
4.0
2
MAX
225
5.3
-
UNITS
µA
RMIC
3.0
-
kΩ
IRN
NFB 0.2 to 10kHz at 12 dB/oct
VIN = -80 dBV
µVRMS
dB
A
44.5
-16
46.5
-14
48.5
-12
V
MPO Level
MPO
VIN = -50 dBV
RMPO = 0
dBV
Change in MPO
∆MPO
VIN = -50 dBV
10
12
14
dB
RMPO = 10 kΩ
Preamp A input Bias Current
Pull-up Resistance
Gain Loss
IBIAS A
RPULL
-25
40
-
0
48
0
+25
58
nA
kΩ
dB
∆GAIN
R4 = 10 k, VIN = -70 dBV,
RMPO = 50 k
2.5
I
AMP
V
=1.3 VDC
R
B
MIC
7
A
6
5
R
PULL
V
OUT
B
A
8
0µ1
3k9
R
CLIP
0µ22
V
V
IN
IN
1+40 dB
1k
4
2
1
47k
3
10
R
0µ1
MPO
R4
100k
All resistors in ohms, all capacitors in µF, unless otherwise stated.
Fig. 1 Test Circuit
510 - 99 - 06
2
R
MIC
7
6
R
PULL
4
8
BASE CURRENT
COMPENSATION
33k
5
2k5
1
2
3
All resistors in ohms, all capacitors in µF,
unless otherwise stated.
Fig. 2 Functional Schematic
V
=1.3 VDC
R
B
MIC
7
8
6
1µ0
R
1µ0
PULL
CLASS D
INTEGRATED
RECEIVER
B
MIC
A
5
33n
0µ1
R
CLIP
48k
4
2
3
1
10k
R
R
VC
MPO
100k
22n
All resistors in ohms, all capacitors in µF, unless otherwise stated.
Fig. 3 Typical Application Circuit
510 - 99 - 06
3
-10
-15
-20
-25
-30
-35
-40
-45
-50
-10
-20
-30
-40
-50
-60
-70
-80
-90
RVC = 100k
RMPO = 0
R
VC = 33k
RMPO = 3k3
RMPO = 10k
RVC = 10k
RVC = 3k3
-140
-120
-100
-80
-60
-40
-20
-100
-80
-60
-40
-20
INPUT (dBV)
INPUT (dBV)
Fig. 5 I/O for Various MPO Values
Fig. 4 I/O Curves at Various R Settings
VC
4
0
10
9
8
7
6
5
4
3
2
1
0
CS = 0µ22
CS = 0µ1
-4
C
S = 0µ047
-8
C
S = 0µ033
-12
-16
-20
20
200
2k
20k
-90
-86
-82
-78
-74
-70
-66
-62
-58
FREQUENCY (Hz)
INPUT (dBV)
Fig. 7 Distortion vs Input Level (R =100kΩ)
Fig. 6 Frequency Response for Various CS Values
VC
0
-10
-20
-30
-40
-50
-60
-70
-80
-90
0
5
10
15
20
25
30
RMPO (kΩ)
Fig. 8 Quiescent Current vs MPO Resistance
510 - 99 - 06
4
-10
-14
-18
-22
-26
-30
-34
-38
-42
-46
-50
55
50
45
40
35
No Load
50k Load
0
10
100
1k
10k
100k
10
100
1k
10k
100k
RMPO (Ω)
FREQUENCY (Hz)
Fig. 9 Output vs MPO Resistance
Fig. 10 Preamplifier A Open Loop Voltage Gain
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.
Printed in Canada.
510 - 99 - 06
5
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