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PDF GM358 Data sheet ( Hoja de datos )
| Número de pieza | GM358 | |
| Descripción | DUAL OPERATIONAL AMPLIFIER | |
| Fabricantes | Gamma Microelectronics | |
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AA
MICROELECTRONICS
Signal Conditioning
GM358
DUAL OPERATIONAL AMPLIFIER
Description
Utilizing the circuit designs perfected for two operational
amplifiers, these dual operational amplifiers feature low
power drain, a common mode input voltage range extend-
ing to GND/ V EE, and single supply or split supply opera-
tion. The GM358 is equivalent to one-half of an GM324.
These amplifiers have several distinct advantages over
standard operational amplifier types in single supply appli-
cations. They can operate at supply voltages as low as 3.0
V or as high as 32 V, with quiescent currents about one-ifth
of those associated with the MC1741 (on a per amplifier ba-
sis). The common mode input range includes the negative
supply, thereby eliminating the necessity for external bias-
ing components in many applications. The output voltage
range also includes the negative power supply voltage.
Features
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
SINGLE SUPPLY
3.0V to VCC(max)
VCC
1
2
VEE/ GND
SPLIT SUPPLIUES
VCC
1
2
VEE
VEE/ GND
1.5V to VCC(max)
1.5V to VEE(max)
www.gammamicro.com 1
1 page  
AA
MICROELECTRONICS
SCHEMATIC BLOCK DIAGRAM
Signal Conditioning
GM358
DUAL OPERATIONAL AMPLIFIER
Q16
Q19
5.0pF
Q15
Q14
40k
Q12
Inputs
Q18 Q20
Q17
Q2
Q3
Q21
Q5
Q4
Q6 Q7
Q8
Q9
Output
Bias Circuitry Common
to both Amplifiers
VCC
Q22
Q13
Q23 Q24
25k
Q11
Q25
Q1
Q10
2.0k 2.4k
VEE/ GND
CIRCUIT DESCRIPTION
The GM358 series is made by using two internally compensated, andtwo - stage 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.
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 single - ended converter. The second stage consists a standard current source load
amplifier stage.
Each amplifier is biased from an internal voltage regulator, which has a low temperature coefficient
thus giving each amplifier good temperature characteristics as well as excellent power supply
rejection.
5
5 Page | ||
| Páginas | Total 10 Páginas | |
| PDF Descargar | [ Datasheet GM358.PDF ] | |
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