LT5506EUF#PBF

LT5506 is a 40MHz to 500MHz monolithic integrated quadrature demodulator with variable gain amplifier (VGA), 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 lowpass noise filters. 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 cut-off frequency of the noise filters is approximately 8.8MHz. It is widely used in applications such as IEEE802.11, high speed wireless LAN, wireless local loop etc.

• Low delay shift over gain control range is 2ps/dB typical at (TA = 25°C, EN = VCC)
• THD is 0.12% (-58dBc) at 800mVP-P differential output level
• IF overload detector, outputs biased up while in standby
• I/Q amplitude imbalance is 0.2dB typical at (TA = 25°C, EN = VCC)
• Baseband I/Q phase imbalance is 0.6° typical at (TA = 25°C, EN = VCC)
• Noise figure at max gain is 6.8dB typical at (VCTRL = 1.7V, TA = 25°C, EN = VCC)
• Input IP3, min gain is -0.5dBm typ at (PIF = -22.5dBm, TA = 25°C, EN = VCC)
• Low supply current is 26.5mA typical at (EN = high, STBY = low or high)
• Operating temperature range from -40°C to 85°C
• Package style is 16-lead plastic QFN

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