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LTC5599 Datasheet(PDF) 1 Page - Linear Technology |
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LTC5599 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 42 page  LTC5599 1 5599f For more information www.linear.com/LTC5599 Typical applicaTion FeaTures DescripTion 30MHz to 1300MHz Low Power Direct Quadrature Modulator applicaTions L , LT, LTC, LTM, Linear Technology, and the Linear logo are registered trademarks and QuikEval is a trademark of Linear Technology Corporation. All other trademarks are the property of their respective owners. The LTC®5599 is a direct conversion I/Q modulator de- signed for low power wireless applications that enable direct modulation of differential baseband I and Q signals onanRFcarrier.Singleside-bandmodulationorside-band suppressed upconversion can be achieved by applying 90° phase-shifted signals to the I and Q inputs. The I/Q baseband input ports can be either AC or DC coupled to a source with a common mode voltage level of about 1.4V. The SPI interface controls the supply current, modulator gain,andallowsoptimizationoftheLOcarrierfeedthrough and side-band suppression, with sine wave or square wave LO drive. A fixed LC network on the LO and RF ports covers a continuous 90MHz to 1300MHz operation. An on-chip thermometer can be activated to compensate for gain-temperature variations. More accurate temperature measurements can be made using an on-chip diode. In addition, a continuous analog gain control (VCTRL) pin can be used for fast power control. 90MHz to 1300MHz Direct Conversion Transmitter Application n Frequency Range: 30MHz to 1300MHz n Low Power: 2.7V to 3.6V Supply; 28mA n Low LO Carrier Leakage: –51.5dBm at 500MHz n Side-Band Suppression: –52.6dBc at 500MHz n Output IP3: 20.8dBm at 500MHz n Low RF Output Noise Floor: –156dBm/Hz at 6MHz Offset, PRF = 3dBm n Sine Wave or Square Wave LO Drive n SPI Control: Adjustable Gain: –19dB to 0dB in 1dB Steps Effecting Supply Current from 8mA to 35mA I/Q Offset Adjust: –65dBm LO Carrier Leakage I/Q Gain/Phase Adjust: –60dBc Side-Band Suppressed n 24-Lead QFN 4mm × 4mm Package n Wireless Microphones n Battery Powered Radios n Ad-Hoc Wireless Infrastructure Networks n “White-Space” Transmitters n Software Defined Radios (SDR) n Military Radios EVM and Noise Floor vs RF Output Power and Digital Gain Setting with 1Ms/s 16-QAM Signal LTC5599 VCC 3.3V 5599 TA01a 1nF + 4.7µF 90° 0° I-CHANNEL Q-CHANNEL THERMOMETER TTCK SPI BASEBAND GENERATOR EN RF = 90MHz to 1300MHz PA 39nH 15pF VCO/SYNTHESIZER 10nF VCTRL I-DAC Q-DAC V I V I RF OUTPUT POWER (dBm) –15 10 9 7 5 8 6 4 3 0 1 –105 –115 –125 –135 –145 –155 –165 2 0 5599 TA01b 5 –5 –10 DG = –19 DG = –16 DG = –12 DG = –8 DG = –4 DG = 0 |
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Similar Description - LTC5599_15 |
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