LT5546EUF#PBF

LT5546 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. It is widely used in applications such as GPS IF receivers, satellite IF receivers, VHF/UHF receivers, wireless local loop etc.

• I/Q amplitude imbalance is 0.14dB typical at (VCC = 3V, f2xLO = 570MHz)
• IF overload detector
• Log linear gain control range from -7dB to 56dB
• Noise figure at max gain is 7.8dB typical at (VCTRL = 1.7V, VCC = 3V, f2xLO = 570MHz)
• Low supply current is 24mA typ at (EN = high, STBY = low or high)
• Low delay shift over gain control range is 2ps/dB typ at (VCC = 3V, f2×LO = 570MHz)
• Outputs biased up while in standby
• Operating temperature range from -40°C to 85°C
• Package style is 16-lead plastic QFN

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