LT5572

www.DataSheet4U.com FEATURES ■ ■ ■ ■ LT5572 1.5GHz to 2.5GHz High Linearity Direct Quadrature Modulator DESCRIPTIO The LT5572 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 PHS, GSM, EDGE, TD-SCDMA, CDMA, CDMA2000, W-CDMA and other systems. It may also be configured as an image reject up-converting mixer by applying 90° phase-shifted signals to the I and Q inputs. The high impedance 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. , LTC and LT are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ ■ ■ ■ ■ ■ ■ U APPLICATIO S ■ ■ Direct Conversion from Baseband to RF High Output: –2.5dB Conversion Gain High OIP3: +21.6dBm at 2GHz Low Output Noise Floor at 20MHz Offset: No RF: –158.6dBm/Hz POUT = 4dBm: –152.5dBm/Hz ...