LT5506

Supply Voltage ....................................................... 5.5V
Differential Voltage Between 2xLO+ and 2xLO.......... 4V
IF+, IF ..........................................500mV to 500mV
IOUT+, IOUT, QOUT+, QOUT ...........VCC  1.8V to VCC
Operating Ambient Temperature
(Note 2) ..............................................40°C to 85°C
Storage Temperature Range ...............65°C to 125°C
Voltage on Any Pin
Not to Exceed ........................500mV to VCC + 500mV

The LT®5506 is a 40MHz to 500MHz monolithic integrated quadrature demodulator with variable gain amplifier (VGA), designed for low voltage operation. The LT5506 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 LT5506 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 linearin- 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. The external 2xLO frequency is required to be twice the IF input frequency for the mixers. The standby mode provides reduced supply current and fast transient response into the normal operating modewhen the I/Q outputs are AC-coupled to a baseband chip.