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NE5230N View Datasheet(PDF) - Philips Electronics

Part Name
Description
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NE5230N
Philips
Philips Electronics Philips
NE5230N Datasheet PDF : 17 Pages
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Philips Semiconductors
Low voltage operational amplifier
Product specification
NE/SA5230
THERMAL CONSIDERATIONS
When using the NE5230, the internal power dissipation capabilities
of each package should be considered. Philips Semiconductors
does not recommend operation at die temperatures above 110°C in
the SO package because of its inherently smaller package mass.
Die temperatures of 150°C can be tolerated in all the other
packages. With this in mind, the following equation can be used to
estimate the die temperature:
TJ = TA + (PD × θJA)
(1)
Where
TA 5 AmbientTemperature
TJ + Die Temperature
PD 5 Power Dissipation
+ (ICC x VCC)
qJA 5 Packagethermalresistance
+ 270oCńW for SO * 8 in PC
board mounting
See the packaging section for information regarding other methods
of mounting.
θJA=100°C/W for the plastic DIP;
θJA=110°C/W for the ceramic DIP.
The maximum supply voltage for the part is 15V and the typical
supply current is 1.1mA (1.6mA max). For operation at supply
voltages other than the maximum, see the data sheet for ICC versus
VCC curves. The supply current is somewhat proportional to
temperature and varies no more than 100µA between 25°C and
either temperature extreme.
Operation at higher junction temperatures than that recommended is
possible but will result in lower MTBF (Mean Time Between
Failures). This should be considered before operating beyond
recommended die temperature because of the overall reliability
degradation.
DESIGN TECHNIQUES AND APPLICATIONS
The NE5230 is a very user-friendly amplifier for an engineer to
design into any type of system. The supply current adjust pin (Pin 5)
can be left open or tied through a pot or fixed resistor to the most
negative supply (i.e., ground for single supply or to the negative
supply for split supplies). The minimum supply current is achieved
by leaving this pin open. In this state it will also decrease the
bandwidth and slew rate. When tied directly to the most negative
supply, the device has full bandwidth, slew rate and ICC. The
programming of the current-control pin depends on the trade-offs
which can be made in the designer’s application. The graph in
Figure 4 will help by showing bandwidth versus ICC. As can be seen,
the supply current can be varied anywhere over the range of 100µA
to 600µA for a supply voltage of 1.8V. An external resistor can be
inserted between the current control pin and the most negative
supply. The resistor can be selected between 1to 100kto
provide any required supply current over the indicated range. In
addition, a small varying voltage on the bias current control pin could
be used for such exotic things as changing the gain-bandwidth for
voltage controlled low pass filters or amplitude modulation.
Furthermore, control over the slew rate and the rise time of the
amplifier can be obtained in the same manner. This control over the
slew rate also changes the settling time and overshoot in pulse
response applications. The settling time to 0.1% changes from 5µs
at low bias to 2µs at high bias. The supply current control can also
be utilized for wave-shaping applications such as for pulse or
triangular waveforms. The gain-bandwidth can be varied from
between 250kHz at low bias to 600kHz at high bias current. The
slew rate range is 0.08V/µs at low bias and 0.25V/µs at high bias.
800
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300 400 500 600700
UNITY GAIN BANDWIDTH (kHz)
a. Unity Gain Bandwidth vs Power Supply Current for
VCC = ±0.9V
1.4
VCC = 15V
1.2
VCC = 12V
1.0 VCC = 9V
0.8
VCC = 6V
VCC = 3V
TA = 25°C
0.6 VCC = 2V
0.4
VCC = 1.8V
0.2
0.0100
101
102
103
104
105
RADJ ()
b. ICC Current vs Bias Current Adjusting Resistor for
Several Supply Voltages
SL00253
Figure 4.
The full output power bandwidth range for VCC equals 2V, is above
40kHz for the maximum bias current setting and greater than 10kHz
at the minimum bias current setting.
If extremely low signal distortion (<0.05%) is required at low supply
voltages, exclude the common-mode crossover point (VB1) from the
common-mode signal range. This can be accomplished by proper
bias selection or by using an inverting amplifier configuration.
Most single supply designs necessitate that the inputs to the op amp
be biased between VCC and ground. This is to assure that the input
signal swing is within the working common-mode range of the
amplifier. This leads to another helpful and unique property of the
NE5230 that other CMOS and bipolar low voltage parts cannot
achieve. It is the simple fact that the input common-mode voltage
can go beyond either the positive or negative supply voltages. This
benefit is made very clear in a non-inverting voltage-follower
configuration. This is shown in Figure 5 where the input sine wave
allows an undistorted output sine wave which will swing less than
100mV of either supply voltage. Many competitive parts will show
severe clipping caused by input common-mode limitations. The
NE5230 in this configuration offers more freedom for quiescent
biasing of the inputs close to the positive supply rail where similar op
amps would not allow signal processing.
1994 Aug 31
8
 

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