ISL28246FBZ-T7

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ISL28246FBZ-T7: application field and working principle

The ISL28246FBZ-T7 is an instrumentation, OP amps, and buffer amplifiers product manufactured by Intersil. It is a low power, delta-sigma modulator featuring a wide input common-mode range and rail-to-rail outputs. This device is ideally suited for applications incorporating data conversion of low bandwidth signals. It includes integral output amplifiers on each of the positive and negative outputs.

Specifications

• Input Voltage Range: -3.3V to +3.3V
• Supply Voltage Range: 5V to +10V
• Power Dissipation: 100mW
• Input Offset Voltage: 5mV Maximum
• Input Bias current: 80µA Maximum
• Power Supply Rejection Ratio: 75dB Typical
• Gain Bandwidth Product: 200kHz Typical

Application fields

The ISL28246FBZ-T7 is well-suited for many data conversion applications such as thermocouples and RTD sensors, strain gauge transducers, acceleration and pressure sensors, bridge transducers and low noise amplifiers.

It is particularly useful in biomedical applications as it can work with low frequency signals, such as heartbeats and respiration. Additionally, it can be employed in medical imaging, ultrasound, ECG and EMG applications.

Furthermore, the ISL28246FBZ-T7 is suitable for applications in industrial process control, digital closed loop control systems, automatic test equipment and remote data acquisition systems.

Working principle

The ISL28246FBZ-T7 is a differential input, delta-sigma modulator with an output amplifier and a digital interface. It uses the principles of delta-sigma (ΔΣ) modulation which is a form of analog-to-digital conversion.

In this method, the analog input is sampled at a much higher rate than the rate according to which the data is required. The samples are then quantized and filtered to produce a digital output with much better resolution than what would have been possible with a single sampling.

The ISL28246FBZ-T7 has two main sections: the delta-sigma modulator and the output amplifier. The modulator receives analog input signals and produces digital output data by performing the above-mentioned steps. The output amplifier then converts the digital output data into analog form.

The ISL28246FBZ-T7 uses a low-pass filter and a quantization block to achieve the desired conversion. The low-pass filter attenuates any high frequency components from the analog signals and passes only the components with frequency below the cut-off frequency of the filter.

The quantization block sets the resolution for the data conversion. It maps the input range of the signal to a set of discrete digital levels and produces a digital output code for each sample. The resolution for the ISL28246FBZ-T7 is 10 bits.

Once the conversion from analog to digital is complete, the digital data is sent to an output amplifier which converts it back to analog form. The output amplifier is designed to work with both the positive and negative output signals. This ensures that the output signal is symmetrical with respect to the supply voltage.

Conclusion

The ISL28246FBZ-T7 is an instrumentation, OP amps, and buffer amplifiers product manufactured by Intersil. It uses the principles of delta-sigma modulation to convert low frequency analog signals into high resolution digital data. This makes it suitable for biomedical applications, control systems and data acquisition systems. The output amplifier ensures that the output signal is symmetrical with respect to the supply voltage and that the desired resolution is achieved.

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