LT5502 Datasheet PDF

FEATURES

s Single 1.8V to 5.25V Supply s IF Frequency Range: 70MHz to 400MHz s 84dB Limiting IF Gain s 90dB Linear RSSI Range s 7.7MHz Lowpass Output Filter s Baseband I/Q Amplitude Imbalance: <0.7dB s 4dB Noise Figure s Low Supply Current: 25mA s Outputs Biased Up While in Standby s Shutdown Current: 1µA s 24-Lead Narrow SSOP Package U APPLICATIO S s IEEE802.11 s High Speed Wireless LAN s Wireless Local Loop TYPICAL APPLICATIO U U LT5502 400MHz Quadrature IF Demodulator with RSSI DESCRIPTIO The LT®5502 is a 70MHz to 400MHz monolithic integrated quadrature IF demodulator. It consists of an IF limiter, quadrature down mixers, integrated lowpass filters, and divide-by-two LO buffers. The demodulator provides all building blocks for demodulation of I and Q baseband signals with a single supply voltage of 1.8V to 5.25V. The IF limiter has 84dB small-signal gain, and a built-in receive signal strength indicator (RSSI) with over 90dB linear range. The input referred noise-spectral-density is 1.45nV/√Hz, which is equivalent to a 4dB noise figure when the input is terminated with a 50Ω source.