LT LT5546EUF#TRPBF

解调器80MHz ~ 1GHz40MHz ~ 500MHz

Overview

The LT5546EUF is a 40MHz to 500MHz monolithic integrated quadrature demodulator with variable gain amplifier (VGA) and 17MHz I/Q baseband bandwidth designed for low voltage operation. It supports standards that use a linear modulation format. The chip consists of a VGA, quadrature down-converting mixers and 17MHz lowpass noise filters (LPF). The LO port consists of a divide-by-two stage and LO buffers. The IC provides all building blocks for IF down-conversion to I and Q baseband signals with a single supply voltage of 1.8V to 5.25V. The VGA gain has a linear-in-dB relationship to the control input voltage. Hard-clipping amplifiers at the mixer outputs reduce the recovery time from a signal overload condition. The lowpass filters reduce the out-of-band noise and spurious frequency components. The –3dB corner frequency of the noise filters is approximately 17MHz and has a first order roll-off. The standby mode provides reduced supply current and fast transient response into the normal operating mode when the I/Q outputs are AC-coupled to a baseband chip.

Features

Tape & Reel (TR) Package
Demodulator Function
80MHz ~ 1GHz LO Frequency
40MHz ~ 500MHz RF Frequency
7.8dB Noise Figure
24 mA Current - Supply
1.8V ~ 5.25V Voltage - Supply
Surface Mount Mounting Type