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LTC5598 - 5MHz to 1600MHz High Linearity Direct Quadrature Modulator

The LTC5598 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 point-to-point microwave link, GSM, EDGE, CDMA, 700MHz band LTE, CDMA2000, CATV applications and other systems. It may also 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 a buffer, which converts the differential mixer signals to a 50Ω single-ended buffered RF 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 or differential inputs, and precision quadrature generators that produce the LO drive for the mixers. The supply voltage range is 4.5V to 5.25V, with about 168mA current.

Features Frequency Range: 5MHz to 1600MHz High Output IP3:      +27.7dBm at 140MHz      +22.9dBm at 900MHz Low Output Noise Floor at 6MHz Offset:   No Baseband AC Input: -161.2dBm/Hz   POUT = 5.5dBm: -160dBm/Hz Low LO Feedthrough: -55dBm at 140MHz High Image Rejection: -50.4dBc at 140MHz Integrated LO Buffer and LO Quadrature Phase Generator 50Ω Single-Ended LO and RF Ports >400MHz Baseband Bandwidth 24-Lead QFN 4mm x 4mm Package Pin-Compatible with Industry Standard Pin-Out Shut-down Mode Typical Application

Applications Point-to-Point Microwave Link Military Radio Basestation Transmitter GSM/EDGE/CDMA2K 700MHz LTE Basestation Transmitter Satellite Communication CATV/Cable Broadband Modulators 13.56MHz/UHF RFID Modulator Packaging

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