800MHz to 1.5GHz Direct Conversion Quadrature Demodulator

The LT5516 is an 800MHz to 1.5GHz direct conversion quadrature demodulator optimized for high linearity receiver applications. It is suitable for communications receivers where an RF or IF signal is directly converted into I and Q baseband signals with bandwidth up to 260MHz. The LT5516 incorporates balanced I and Q mixers, LO buffer amplifiers and a precision, high frequency quadrature generator.

In an RF receiver, the high linearity of the LT5516 provides excellent spur-free dynamic range, even with fixed gain front end amplification. This direct conversion receiver can eliminate the need for intermediate frequency (IF) signal processing, as well as the corresponding requirements for image filtering and IF filtering. Channel filtering can be performed directly at the outputs of the I and Q channels. These outputs can interface directly to channelselect filters (LPFs) or to a baseband amplifier.

Applications

* Cellular/PCS/UMTS Infrastructure

* High Linearity Direct Conversion I/Q Receiver

* High Linearity I/Q Demodulator

* Frequency Range: 800MHz to 1.5GHz

* High IIP3: 21.5dBm at 900MHz

* High IIP2: 52dBm

* Noise Figure: 12.8dB at 900MHz

* Conversion Gain: 4.3dB at 900MHz

* I/Q Gain Mismatch: 0.2dB

* Shutdown Mode

* 16-Lead QFN 4mm x 4mm Package with Exposed Pad