NE5230 데이터 시트보기 (PDF) - Philips Electronics
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NE5230 Datasheet PDF : 17 Pages
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Philips Semiconductors
Low voltage operational amplifier
Product specification
NE/SA5230
V+
V–
V+
V–
V+
V+
+
–
V–
NE5230
OTHER
PARTS
when no current is flowing, but also can power the transducer at the
remote location. Usually the transducer itself is not equipped to
provide for the current transmission. The unique features of the
NE5230 can provide high output current capability coupled with low
power consumption. It can be remotely connected to the transducer
to create a current loop with minimal external components. The
circuit for this is shown in Figure 6. Here, the part is configured as a
voltage-to-current, or transconductance amplifier. This is a novel
circuit that takes advantage of the NE5230’s large open-loop gain.
In AC applications, the load current will decrease as the open-loop
gain rolls off in magnitude. The low offset voltage and current
sinking capabilities of the NE5230 must also be considered in this
application.
3
+
VCC
7
6
NE5230
2
5
–4
VEE
T
R
A
N
S
D
U VIN
C
RC
E
R
IOUT
+ REMOTE
V POWER
– SUPPLY
RL
V–
SL00254
Figure 5. In a Non-Inverting Voltage-Follower Configuration,
the NE5230 will Give Full Rail-to-Rail Swing. Other Low Voltage
Amplifiers will not Because they are Limited by their Input
Common-Mode Range and Output Swing Capability.
There are not as many considerations when designing with the
NE5230 as with other devices. Since the NE5230 is
internally-compensated and has a unity gain-bandwidth of 600kHz,
board layout is not so stringent as for very high frequency devices
such as the NE5205. The output capability of the NE5230 allows it
to drive relatively high capacitive loads and small resistive loads.
The power supply pins should be decoupled with a low-pass RC
network as close to the supply pins as possible to eliminate 60Hz
and other external power line noise, although the power supply
rejection ratio (PSRR) for the part is very high. The pinout for the
NE5230 is the same as the standard single op amp pinout with the
exception of the bias current adjusting pin.
REMOTE TRANSDUCER WITH CURRENT
TRANSMISSION
There are many ways to transmit information along two wires, but
current transmission is the most beneficial when the sensing of
remote signals is the aim. It is further enhanced in the form of 4 to
20mA information which is used in many control-type systems. This
method of transmission provides immunity from line voltage drops,
large load resistance variations, and voltage noise pickup. The zero
reference of 4mA not only can show if there is a break in the line
NOTES:
1. IOUT = VIN/RC
2.
RL MAX ≈
VREMOTE * 1.8V * VINMAX
IOUT
For RC = 1Ω
IOUT
VIN
4mA
4mV
20mA
20mV
a. The NE5230 as a Remote Transducer Transconductance
Amp With 4-20mA Current Transmission Output Capability
+
RC
VIN
–
VCC
3
7
+
6
NE5230
+
VCC
–
2
–
5
4
VEE
+ IOUT
RL
b. The Same Type of Circuit as Figure 5a, but for Sourcing
Current to the Load
SL00255
Figure 6.
1994 Aug 31
9
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