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LT5571 Datasheet(PDF) 1 Page - Linear Technology |
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LT5571 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 30 page  LTC5588-1 1 55881fb TYPICAL APPLICATION FEATURES DESCRIPTION 200MHz to 6000MHz Quadrature Modulator with Ultrahigh OIP3 The LTC®5588-1 is a direct conversion I/Q modulator designed for high performance wireless applications. It allows direct modulation of an RF signal using differential baseband I and Q signals. It supports LTE, GSM, EDGE, TD-SCDMA, CDMA, CDMA2000, W-CDMA, WiMax and other communication standards. It can also be config- ured as an image reject upconverting mixer, by applying 90° phase-shifted signals to the I and Q inputs. The I/Q baseband inputs drive double-balanced mixers. An on- chip balun converts the differential mixer signals to a 50Ω single-ended RF output. Four balanced I and Q baseband input ports are DC-coupled with a common mode volt- age level of 0.5V. The LO path consists of an LO buffer with single-ended or differential inputs and precision quadrature generators to drive the mixers. The supply voltage range is 3.15V to 3.45V. An external voltage can be applied to the LINOPT pin to further improve 3rd-order linearity performance. Accurate temperature dependent calibrations can be performed using the on-chip thermistor. 200MHz to 6000MHz Direct Conversion Transmitter Application APPLICATIONS n Frequency Range: 200MHz to 6000MHz n OutputIP3:+31dBmTypicalat2140MHz(Uncalibrated) +35dBm Typical (User Optimized) n Single Pin Calibration to Optimize OIP3 n Low Output Noise Floor at 6MHz Offset: No RF: –160.6dBm/Hz POUT = 5dBm: –155.5dBm/Hz n Integrated LO Buffer and LO Quadrature Phase Generator n High Impedance DC Interface to Baseband Inputs with 0.5V Common Mode Voltage* n 50Ω Single-Ended LO and RF Ports n 3.3V Operation n Fast Turn-Off/On: 10ns/17ns n Temperature Sensor (Thermistor) n 24-Lead UTQFN 4mm × 4mm Package n LTE, GSM/EDGE, W-CDMA, TD-SCDMA, CDMA2K, WiMax Basestations n Image Reject Upconverters n Point-to-Point Microwave Links n Broadcast Modulator n Military Radio L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. *Contact LTC Marketing for other common mode voltage versions. 90 0 LTC5588-1 VCC V I V I 1nF 50Ω 1nF 6.8pF 3.3V 0.2pF BASEBAND GENERATOR RF = 200MHz TO 6000MHz 1nF + 4.7μF 2 EN I-CHANNEL Q-CHANNEL 55881 TA01a I-DAC Q-DAC VCO/SYNTHESIZER PA LINOPT LTC2630 ACPR, AltCPR and ACPR, AltCPR with Optimized LINOPT Voltage vs RF Output Power at 2.14GHz for W-CDMA 1, 2 and 4 Carriers RF OUTPUT POWER PER CARRIER (dBm) –20 –60 –50 –40 4C 2C 1C 0 55881 TA01b –70 –80 –90 –15 –10 –5 5 ACPR ACPR (OPT) AltCPR AltCPR (OPT) DOWNLINK TEST MODEL 64 DPCH fBB = 140MHz, fLO = 2280MHz |
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