HMC898LP4ETR Integrated Circuits (ICs)

HMC898LP4ETR is an active filter IC, used in a wide range of applications. This article will discuss the application fields and working principles of HMC898LP4ETR.

HMC898LP4ETR is a multi-function, high performance digital filter IC from Analogue Devices. It provides various filter functions such as Chebyshev filters, Butterworth filters, Bessel filters, elliptic filters, and arbitrary filters. The device includes a low-power DSP core, embedded ROM, and a variety of I/O ports for control and data manipulation. It supports 8, 16, and 24-bit input and output data, in addition to a wide variety of filter structures. The device also offers a number of features such as flexible coefficient scaling, coefficient optimization, and a highly programmable register structure.

The HMC898LP4ETR is well suited for applications in a wide variety of fields such as audio processing, video processing, communications, instrumentation, and medical imaging. In audio processing, the device can be used for applications such as equalization, crossover networks, dynamic range control, and signal filtering. Similarly, in video processing applications, it can be used for analog-to-digital conversion, bandwidth limiting, signal synchronization and signal filtering. In communications applications, it can be used for signal equalization, signal equalization in reverse, power line noise reduction, and echo cancellation. It can also be used in instrumentation for vibration analysis and for motor control, as well as for medical imaging in CT scan, ultrasound, and MRI applications.

The functionality and features of the HMC898LP4ETR are realized by the device structure and its working principle. At the core of the device is a digital signal processing (DSP) core that is optimized for low power and high performance. The DSP core is capable of executing various algorithms like a microcontroller and is the main computation engine for the device. The DSP core is supported by a programmable and re-programmable ROM memory for memory and coefficient storage, with maximum ROM size of 64Kbytes. Additionally, the device includes two serial ports (I2C and SPI) for programmability and control.

The signal processing engines of the HMC898LP4ETR is based on the switched signal-flow architecture, which consists of a cascade of second-order filters, or biquadratic filters. These biquadratic filters can be configured in various combinations to form various types of filters such as band pass, low pass, high pass, notch and all-pass filters. The frequency characteristics of the filter can be controlled through the adjustable coefficients that are stored in the embedded ROM and controlled through the I2C/SPI ports.

In addition to the programmability, the device also integrates the functionality of automatic gain control, voice-over noise reduction, and echo control. Furthermore, it offers high linearity and low-distortion performance with up to 112 dB dynamic range. The power supply to the device can be switched off to conserve power, as well as enter into a low-power sleep mode when no signal is present.

In summary, the HMC898LP4ETR is an active filter IC that is used in a wide variety of applications such as audio processing, video processing, communications, instrumentation and medical imaging. The generation of the various filter functions is based on the switched signal-flow architecture and the adjustable coefficients are programmed and stored in the embedded ROM. Finally, it offers high linearity, low distortion performance, and a variety of features such as automatic gain control and voice-over noise reduction.