NE5230, SA5230, SE5230

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9

2.0 V, is above 40 kHz for the maximum bias current setting

and greater than 10 kHz at the minimum bias current setting.

If extremely low signal distortion (<0.05%) is required at

low supply voltages, exclude the common−mode crossover

be accomplished by proper bias selection or by using an

inverting amplifier configuration.

Most single supply designs necessitate that the inputs 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 100 mV 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.

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 600 kHz, 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 60 Hz 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.

V+

V−

+

−

NE5230

OTHER

PARTS

V+

V−

V+

V−

V+

V−

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.