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LT5502

Linear Technology
Part Number LT5502
Manufacturer Linear Technology
Description 400MHz Quadrature IF Demodulator with RSSI
Published Mar 22, 2005
Detailed Description Final Electrical Specifications LT5502 400MHz Quadrature IF Demodulator with RSSI January 2001 FEATURES s s s s s s s ...
Datasheet PDF File LT5502 PDF File

LT5502
LT5502

Overview
Final Electrical Specifications LT5502 400MHz Quadrature IF Demodulator with RSSI January 2001 FEATURES s s s s s s s s s s s DESCRIPTIO Single 1.
8V to 5.
25V Supply IF Frequency Range: 70MHz to 400MHz 84dB Limiting IF Gain 90dB Linear RSSI Range 7.
7MHz Lowpass Output Filter Baseband I/Q Amplitude Imbalance: <0.
7dB 4dB Noise Figure Low Supply Current: 25mA Outputs Biased Up While in Standby Shutdown Current: 1µA 24-Lead Narrow SSOP Package U APPLICATIO S s s s IEEE802.
11 High Speed Wireless LAN Wireless Local Loop 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.
The integrated lowpass output filters act as antialiasing and pulse-shaping filters for demodulated I/Q-baseband signals.
The 3dB cutoff frequency of the filters is about 7.
7MHz.
The VCO frequency is required to be twice the desired operating frequency to provide quadrature local oscillator (LO) signals to the mixers.
The standby mode provides fast transient response to the receive mode with reduced supply current when the I/Q outputs are AC-coupled to a baseband chip.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO I/Q Output Swing, RSSI Output vs IF Input Power 2V C2 1µF C3 22nF IF INPUT R1 240Ω IF + IF – 2XLO 2XLO INPUT 2XLO – LT5502 ENABLE EN GND + C1 1nF 1200 DIFFERENTIAL OUTPUT SWING (mVP-P) VCC 1000 IOUT+ 90° IOUT– QOUT+ BASEBAND DIFFERENTIAL I/Q OUTPUTS 800 ÷2 0° 600 QOUT– RSSI C4 1.
8pF 5502 T...


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