Datasheet NCV5230 (ON Semiconductor) - 8

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NCV5230
The full output power bandwidth range for VCC equals voltage. Many competitive parts will show severe clipping 2.0 V, is above 40 kHz for the maximum bias current setting caused by input common−mode limitations. The NCV5230 and greater than 10 kHz at the minimum bias current setting. in this configuration offers more freedom for quiescent If extremely low signal distortion (<0.05%) is required at biasing of the inputs close to the positive supply rail where low supply voltages, exclude the common−mode crossover similar op amps would not allow signal processing. point (VB1) from the common−mode signal range. This can There are not as many considerations when designing be accomplished by proper bias selection or by using an with the NCV5230 as with other devices. Since the inverting amplifier configuration. NCV5230 is internally−compensated and has a unity Most single supply designs necessitate that the inputs to gain−bandwidth of 600 kHz, board layout is not so stringent the op amp be biased between VCC and ground. This is to as for very high frequency devices such as the NE5205. The assure that the input signal swing is within the working output capability of the NCV5230 allows it to drive common−mode range of the amplifier. This leads to another relatively high capacitive loads and small resistive loads. helpful and unique property of the NCV5230 that other The power supply pins should be decoupled with a low−pass CMOS and bipolar low voltage parts cannot achieve. It is the RC network as close to the supply pins as possible to simple fact that the input common−mode voltage can go eliminate 60 Hz and other external power line noise, beyond either the positive or negative supply voltages. This although the power supply rejection ratio (PSRR) for the benefit is made very clear in a non−inverting part is very high. The pinout for the NCV5230 is the same voltage−follower configuration. This is shown in Figure 5 as the standard single op amp pinout with the exception of where the input sine wave allows an undistorted output sine the bias current adjusting pin. wave which will swing less than 100 mV of either supply V+ V+ + − V− V− V+
NCV5230
V− V+
OTHER PARTS
V−
Figure 5. In a non−inverting voltage−follower configuration, the NCV5230 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. www.onsemi.com 8