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Datasheet: GM358D8 (Gamma Microelectronics)

Dual Operational Amplifier

 

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GM358
DUAL OPERATIONAL AMPLIFIER
Revision 1, May 2002 www.gammamicro.com
PRELIMINARY
PIN CONNECTIONS
1
1
2
3
4
5
6
7
OUTPUT A
V
EE
/GND
V
CC
8
+
+
-
-
OUTPUT B
}
{
INPUTS A
INPUTS B
SOP-8 (TOP VIEW)
Utilizing the circuit designs perfected for two operational
amplifiers, these dual operational amplifiers feature low
power drain, a common mode input voltage range
extending to GND/V
EE
, and single supply or split
supply operation. The GM358 series is equivalent to
onehalf of an GM324.
These amplifiers have several distinct advantages over
standard operational amplifier types in single supply
applications. They can operate at supply voltages as
low as 3.0 V or as high as 32 V, with quiescent currents
about onefifth of those associated with the MC1741
(on a per amplifier basis). The common mode input
range includes the negative supply, thereby eliminating
the necessity for external biasing components in many
applications. The output voltage range also includes
the negative power supply voltage.
Short Circuit Protected Outputs
True Differential Input Stage
Single Supply Operation: 3.0 V to 32 V
Low Input Bias Currents
Internally Compensated
Common Mode Range Extends to Negative Supply
Single and Split Supply Operation
ESD Clamps on the Inputs Increase Ruggedness of the Device without Affecting Operation
1
2
V
EE
/GND
V
CC
3.0V to V
CC(max)
1
2
V
EE
/GND
V
CC
1.5V to V
CC(max)
1.5V to V
EE(max)
V
EE
Figure 1
SINGLE SUPPLY
SPLIT SUPPLIES
GM358
DUAL OPERATIONAL AMPLIFIER
Revision 1, May 2002 www.gammamicro.com
PRELIMINARY
2
R
E
T
E
M
A
R
A
P
L
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B
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-
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2
V
ABSOLUTE MAXIMUM RATINGS
(Note 1) Split Power Supplies.
(Note 2) For Supply Voltages less than 32 V, the absolute maximum input voltage is equal to the supply voltage.
(Note 3) R
JA
for Case 846A.
(Note 4) ESD data available upon request.
8
5
3
M
G
)
l
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e
r
/
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p
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(
8
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A
M
G
T
8
S
8
5
3
A
M
G
8
D
8
5
3
M
G
ORDERING INFORMATION
* For more information contact Gamma Microelectronics inc.
GM358
DUAL OPERATIONAL AMPLIFIER
Revision 1, May 2002 www.gammamicro.com
PRELIMINARY
3
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2
ELECTRICAL CHARACTERISTICS
(V
CC
= 5V, at specified free-air temperature, unless otherwise specified )
* All characteristics are measured under open loop conditions with zero common-mode input voltage unless otherwise specified.
"MAX" V
CC
for testing purposes is 30V. Full range is 0C to 70C.
GM358
DUAL OPERATIONAL AMPLIFIER
Revision 1, May 2002 www.gammamicro.com
PRELIMINARY
4
Output
Inputs
V
CC
V
EE
/GND
Bias Circuitry Common
to both Amplifiers
2.4k
Q25
Q23
Q24
Q22
2.0k
Q1
Q10
Q11
Q9
25k
Q13
Q14
Q15
Q12
40k
Q16
Q19
5.0pF
Q18
Q17
Q2
Q20
Q21
Q3
Q4
Q5
Q6
Q7
Q26
Q8
SCHEMATIC BLOCK DIAGRAM
The GM358 series is made using two internally
compensated, twostage operational amplifiers. The
first stage of each consists of differential input devices
Q20 and Q18 with input buffer transistors Q21 and Q17
and the differential to single ended converter Q3 and
Q4.
The first stage performs not only the first stage gain
function but also performs the level shifting and
transconductance reduction functions. By reducing the
transconductance, a smaller compensation capacitor
(only 5.0 pF) can be employed, thus saving chip area.
The transconductance reduction is accomplished by
splitting the collectors of Q20 and Q18.
(1/2 of circuit)
CIRCUIT DESCRIPTION
Another feature of this input stage is that the input
common mode range can include the negative supply
or ground, in single supply operation, without
saturating either the input devices or the differential to
singleended converter.
The second stage consists of a standard current
source load amplifier stage. Each amplifier is biased
from an internalvoltage regulator which has a low
temperature coefficient thus giving each amplifier good
temperature characteristics as well as excellent power
supply rejection.
GM358
DUAL OPERATIONAL AMPLIFIER
Revision 1, May 2002 www.gammamicro.com
PRELIMINARY
5
SOP-8 PACKAGE OUTLINE DIMENSIONS
L
O
B
M
Y
S
s
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li
M
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A
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A
5
4
.
1
5
7
.
1
7
5
0
.
0
9
6
0
.
0
1
A
1
.
0
5
2
.
0
4
0
0
.
0
1
0
.
0
2
A
5
3
.
1
5
5
.
1
3
5
0
.
0
1
6
0
.
0
B
6
0
3
.
0
6
0
5
.
0
2
1
0
.
0
2
0
.
0
C
3
5
1
.
0
3
5
2
.
0
6
0
0
.
0
1
0
.
0
D
1
8
.
4
1
0
.
5
9
8
1
.
0
7
9
1
.
1
E
4
8
.
3
4
0
.
4
1
5
1
.
0
9
5
1
.
0
1
E
4
8
.
5
4
2
.
6
3
2
.
0
6
4
2
.
0
e
7
2
.
1
5
0
.
0
L
5
4
.
0
1
8
1
0
.
0
9
3
0
.
0
0
8
0
8
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