HMC895 Integrated Circuits (ICs)

Series:	--
Packaging:	Bulk
Lead Free Status / RoHS Status:	--
Part Status:	Obsolete
Moisture Sensitivity Level (MSL):	--
Filter Type:	Band Pass
Frequency - Cutoff or Center:	--
Number of Filters:	1
Filter Order:	--
Voltage - Supply:	--
Mounting Type:	Surface Mount
Package / Case:	24-VFQFN Exposed Pad
Supplier Device Package:	24-SMT (4x4)
Base Part Number:	HMC895

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Introduction

The HMC895 is an active filter and a communications receiver front-end module. It is featured by small size, low power, and high performance. It is designed to cover a wide field of applications such as wireless communication systems, digital signal processing, industrial and automotive systems, health care equipment, digital testing and measurement, and system level design.

Overview

The HMC895 is a combination of a low-noise amplifier, a variable gain amplifier, a variable-gain filter amplifier and a digitally programmable low-pass filter. It has an input impedance of 50ohm and requires a dual power supply of ±5V at 135mA. It comes in a 28-pin LFBGA package with a wide temperature range of -40°C - 85°C. It has an image-reject output stage that provides a maximum gain of 22dB, with a 3dB bandwidth from 400MHz to 4GHz.The main functions of the HMC895 are as follows:1. Low-noise amplifier – Provides gain of up to 22dB, with low noise figure of 5.2dB at 4GHz. 2. Variable gain amplifier – Provides gain of up to 30dB and has a range of 48dB. 3. Variable-gain filter – Provides gain of up to 5dB and has a range of 12dB.4. Digitally programmable low-pass filter – Controllable through two digital control wiring pins to control gain and filter parameters.

Application fields

The HMC895 is suitable for a wide range of applications in both wireless communication systems and digital signal processing.For wireless communication systems, the HMC895 can be used for base station receivers, global navigation satellite system receivers, UWB receivers, and point-to-multipoint systems. It also supports both analog and digital link layer applications. Further, it can be used in wireless surveillance and telemetry applications.For digital signal processing, the HMC895 can be used in digital baseband or modem transceiver applications, as well as in high-end digital test and measurement applications. It is also suitable for digital signal processing in the fields of industrial and automotive systems, audio processing systems, medical instrumentation, and other applications.

Working principles

The HMC895 is composed of four main components: a low-noise amplifier, a variable gain amplifier, a variable-gain filter amplifier, and a digitally programmable low-pass filter.The low-noise amplifier amplifies the input signal with minimal distortions and noise. The variable gain amplifier amplifies a wide range of signals from its input with gains from 0 to 30dB. The variable-gain filter amplifier is used to filter out unwanted signals while allowing the desired signal to pass through. Finally, the digitally programmable low-pass filter is used to achieve a sharp cutoff frequency with flexible control of the filters parameters, such as bandwidth, gain, and center frequency. The digitally programmable low-pass filter is the cornerstone of the HMC895, and it is used to fine-tune the signal levels and filter out unwanted signals. The filter can be configured through two digital control wiring pins, which allow the user to control the gain and filter parameters.

Conclusion

The HMC895 is a versatile and high-performance active filter and communications receiver front-end module. It is suitable for a wide range of applications in both wireless communication systems and digital signal processing. With low noise figures, variable gain amplifiers, and a digitally programmable low-pass filter, the HMC895 can offer high precision signal filtering and manipulation.

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