LT5568-2EUF

Product Summary

The LT5568-2EUF is a High Linearity Direct Quadrature Modulator. The LT5568-2EUF is a direct I/Q modulator designed for high performance wireless applications, including wireless infrastructure. It allows direct modulation of an RF signal using differential baseband I and Q signals. It supports GSM, EDGE, CDMA, CDMA2000 and other systems that operate in the 850MHz to 965MHz band. It may be configured as an image reject upconverting mixer, by applying 90° phase-shifted signals to the I and Q inputs. The I/Q baseband inputs consist of voltage-to-current converters that in turn drive double-balanced mixers. The outputs of these mixers are summed and applied to an on-chip RF transformer, which converts the differential mixer signals to a 50Ω single-ended output. The four balanced I and Q baseband input ports are intended for DC coupling from a source with a common mode voltage level of about 0.5V. The LO path consists of an LO buffer with single-ended input, and precision quadrature generators that produce the LO drive for the mixers. The supply voltage range is 4.5V to 5.25V. The applications of the LT5568-2EUF include Infrastructure Tx for GSM/Cellular Bands, Image Reject Up-Converters for Cellular Bands, Low-Noise Variable Phase-Shifter for 700MHz to 1050MHz Local Oscillator Signals and RFID Reader.

Parametrics

LT5568-2EUF absolute maximum ratings: (1)Supply Voltage: 5.5V; (2)Common Mode Level of BBPI, BBMI and BBPQ, BBMQ: 2.5V; (3)Operating Ambient Temperature (Note 2): –40℃ to 85℃; (4)Storage Temperature Range: –65℃ to 125℃; (5)Voltage on Any Pin Not to Exceed: –500mV to VCC + 500mV.

Features

LT5568-2EUF features: (1)Optimized Image Rejection for 850MHz to 965MHz; (2)High OIP3: +22.9dBm at 900MHz; (3)Integrated LO Buffer and LO Quadrature Phase Generator; (4)50Ω AC-Coupled Single-Ended LO and RF Ports; (5)50Ω DC Interface to Baseband Inputs; (6)Low Carrier Leakage: –43dBm at 900MHz; (7)High Image Rejection: –52dBc at 900MHz; (8)16-Lead 4mm × 4mm QFN Package.

Diagrams