LMH1983SQE/NOPB is a video processing device which is capable of providing two integrators and two Comparators, as well as four general purpose buffers in a single monolithic IC. It is designed to function in various linear video applications, such as skew detection, negative color clipping, and composite video clamping.

Applications

The main applications of the LMH1983SQE/NOPB revolve around linear video processing. The device includes two low-distortion active integrators which can be used for horizontal and vertical sync detect, offering efficient noise shaping for skew detection and stable output voltage. The device also includes two low-distortion zero-cross detectors, which are well-suited for use in the negative color clipping circuit and a composite video clamp circuit.

Working Principle

The active integrators in the LMH1983SQE/NOPB are designed to emulate the functions of an analog integrator. An active integrator is an analog circuit which converts input voltage into another voltage that is directly proportional to the integration of the input voltage. This is done by passing the input voltage through an operational amplifier (Op-Amp), which acts as an inverting amplifier. The output voltage is then proportional to the input voltage integrated over the given time period.

The zero-cross detectors in the LMH1983SQE/NOPB are used to accurately detect changes in the input voltage from zero. This is done by passing the input voltage through another operational amplifier, which acts as an amplifier that amplifies the zero-crossed signal. Once the input voltage crosses zero, the zero-crossed signal is sent to the output terminals. This can then be used in various linear video applications, such as negative color clipping and composite video clamping.

Conclusion

In conclusion, the LMH1983SQE/NOPB offers several linear video processing features within a single monolithic IC. The device includes two low-distortion active integrators which can be used for horizontal and vertical sync detect, as well as two zero-cross detectors which are suited for use in the negative color clipping circuit and the composite video clamp circuit. While the device offers many features, it is important to note that the functions it offers are limited, and thus may not be suitable for all linear video processing applications.