RF & Wireless I/Q Modulators

LTC6946 - Ultralow Noise and Spurious 0.37GHz to 5.7GHz Integer-N Synthesizer with Integrated VCO
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LT5568 - 700MHz to 1050MHz High Linearity Direct Quadrature Modulator

Features

  • Frequency Range: 700MHz to 1050MHz
  • High OIP3: +22.9dBm at 850MHz
  • Low Output Noise Floor at 5MHz Offset:
     No RF: –160.3dBm/Hz
     POUT = 4dBm: –154dBm/Hz
  • 3-Ch CDMA2000 ACPR: –71.4dBc at 850MHz
  • Integrated LO Buffer and LO Quadrature Phase Generator
  • 50Ω AC-Coupled Single-Ended LO and RF Ports
  • 50Ω DC Interface to Baseband Inputs
  • Low Carrier Leakage: –43dBm at 850MHz
  • High Image Rejection: –46dBc at 850MHz
  • 16-Lead 4mm × 4mm QFN Package

Typical Application

LT5568 Typical Application
LT5568 Typical Application

Description

The LT5568 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, WCDMA, and other systems. It may also be confi gured 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.

Packaging

For complete and up to date package information and drawings, please refer to our packaging page

QFN-16

LT5568 Package Drawing

Order Info

Package Variations and Pricing

Part Number Package Pins Temp Price (1-99) Price (1k)* RoHS Data
LT5568-2EUF#PBF QFN 17 E $7.60 $5.35 View
LT5568-2EUF#TRPBF QFN 17 E $5.45 View
LT5568EUF#PBF QFN 16 E $7.60 $5.35 View
LT5568EUF#TRPBF QFN 16 E $5.45 View
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* The USA list pricing shown is for BUDGETARY USE ONLY, shown in United States dollars (FOB USA per unit for the stated volume), and is subject to change. International prices may differ due to local duties, taxes, fees and exchange rates. For volume-specific price or delivery quotes, please contact your local Linear Technology sales office or authorized distributor.

Demo Boards

Linear Technology offers many demo boards free of charge to qualified customers. Contact your local sales office or distributor to inquire about a demo board. Certain demo boards are also available for sale via credit card on this website. Demo boards are for evaluation purposes only. It remains the customer’s responsibility to verify proper and reliable operation in the actual end application.

Part Number Description Price Documentation
DC966A LT5568EUF | 900MHz I/Q Modulator $125.00
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Click here to view our complete list of demo boards

Applications

  • Infrastructure Tx for Cellular Bands
  • Image Reject Up-Converters for Cellular Bands
  • Low-Noise Variable Phase-Shifter for 700MHz to 1050MHz Local Oscillator Signals
  • RFID Reader

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