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LT5572

Linear Technology
Part Number LT5572
Manufacturer Linear Technology
Description 1.5GHz to 2.5GHz High Linearity Direct Quadrature Modulator
Published Aug 29, 2009
Detailed Description www.DataSheet4U.com FEATURES ■ ■ ■ ■ LT5572 1.5GHz to 2.5GHz High Linearity Direct Quadrature Modulator DESCRIPTIO The...
Datasheet PDF File LT5572 PDF File

LT5572
LT5572


Overview
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 Low Carrier Leakage: –39.
4dBm at 2GHz High Image Rejection: –41.
2dBc at 2GHz 4-Channel W-CDMA ACPR: –67.
7dBc at 2.
14GHz Integrated LO Buffer and LO Quadrature Phase Generator 50Ω AC-Coupled Single-Ended LO and RF Ports High Impedance DC Interface to Baseband Inputs with 0.
5V Common Mode Voltage 16-Lead QFN 4mm × 4mm Package ■ Infrastructure Tx for DCS, PCS and UMTS Bands Image Reject Up-Converters for DCS, PCS and UMTS Bands Low Noise Variable Phase Shifter for 1.
5GHz to 2.
5GHz Local Oscillato...


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