description
The LTC®6412 is a fully differential variable gain amplifier that uses log linear analog gain control. It is designed for AC coupling operation in the IF receiver link (from 1MHz to 500MHz). The device has a constant OIP3 over a wide output amplitude range and 31dB gain control range. Furthermore, the relationship between output noise (NF + gain) and gain is flat to provide a uniform spurious-free dynamic range (SFDR)> 120dB at 240MHz and the entire gain control range.
The LTC6412 is ideal for interfacing with the LT®5527 and LT5557 down-conversion mixers, the LTC6410-6 IF amplifier, and the LTC6400 / LTC6401 / LTC6416 ADC drivers suitable for use in 12-bit, 14-bit, and 16-bit ADC applications.
The LTC6412 can achieve fast recovery from overdrive conditions, and the EN pin provides a fast output signal disable function to protect sensitive downstream components. Setting the SHDN pin to an active low state will reduce current consumption to less than 1mA to achieve power-down or sleep mode.
Features
800MHz -3dB small signal bandwidth
Continuously adjustable gain control
-14dB to + 17dB Linear-in-dB Gain Range
Achieved 35dBm OIP3 (at 240MHz) under all gain settings
10dB noise figure (at maximum gain)
Under all gain conditions (IIP3 – NF) = + 8dBm (at 240MHz)
2.7nV / √Hz output reference noise
Differential input and output
50Ω input impedance at all gains
Single supply operation from 3V to 3.6V
110mA supply current
4mm x 4mm x 0.75mm 24-pin QFN package
Typical ApplicaTIon
Package
QFN-24
application
IF signal link automatic gain control (AGC)
2.5G and 3G cellular base station transceivers
WiMAX, WiBro, WLAN receiver
Satellite and GPS receiver IF
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