LT5517

Features:

RF Input Frequency Range: 40MHz to 900MHz
High IIP3: 21dBm at 800MHz
High IIP2: 58dBm at 800MHz
I/Q Gain Mismatch: 0.3dB Max
I/Q Phase Mismatch: 0.7°
Noise Figure: 12.4dB at 800MHz
Conversion Gain: 3.3dB at 800MHz
Baseband Bandwidth: 130MHz
Single Ended, 50W Matched 2XLO Input
Shutdown Mode
16-Lead QFN (4mm ´ 4mm) Package with Exposed Pad


Application

Wireless Infrastructure
High Linearity Direct Conversion I/Q Receiver
 High Linearity I/Q Demodulator


Pinout




Specifications

Power Supply Voltage ............................................ 5.5V
Enable Voltage ....................................................0V, VCC
2XLO Voltage (10dBm Equivalent) .......................... ±1V
RF+ to RF Differential Voltage
(10dBm Equivalent) ................................................. ±2V
Operating Ambient Temperature ..............40°C to 85°C
Storage Temperature Range ................. 65°C to 125°C
Maximum Junction Temperature .......................... 125°C

Description

The LT®5517 is a 40MHz to 900MHz quadrature demodulator optimized for high linearity receiver applications
where high dynamic range is important. It is suitable for communications receivers where an RF or IF signal is
directly converted into I and Q baseband signals with a bandwidth up to 130MHz. The LT5517 incorporates balanced I and Q mixers, LO buffer amplifiers and a precision, broadband quadrature generator derived from an on-chip divide-by-two circuit.

The superior linearity and low noise performance of the LT5517 is achieved across its full frequency range. A wellbalanced divide-by-two circuit generates precision quadrature LO carriers to drive the I mixer and the Q mixer.
Consequently, the outputs of the I-channel and the Q-channel are well matched in amplitude, and their phases
are 90° apart. The LT5517 also provides excellent 50W
impedance matching at the 2XLO port across its entire frequency range.