NOISE FLOOR AT 30MHz OFFSET (dBm/Hz) LT5558 600MHz to 1100MHz High Linearity Direct Quadrature Modulator FEATURES DESCRIPTION Direct Conversion from Baseband to RF The LT 5558 is a direct I/Q modulator designed for high High OIP3: + 22.4dBm at 900MHz performance wireless applications, including wireless Low Output Noise Floor at 20MHz Offset: infrastructure. It allows direct modulation of an RF signal No RF: 158dBm/Hz using differential baseband I and Q signals. It supports P = 4dBm: 152.7dBm/Hz GSM, EDGE, CDMA, CDMA2000, and other systems. It OUT Low Carrier Leakage: 43.7dBm at 900MHz may also be con gured as an image reject upconverting High Image Rejection: 49dBc at 900MHz mixer, by applying 90 phase-shifted signals to the I and 3 Channel CDMA2000 ACPR: 70.4dBc at 900MHz Q inputs. The high impedance I/Q baseband inputs consist Integrated LO Buffer and LO Quadrature Phase of voltage-to-current converters that in turn drive double- Generator balanced mixers. The outputs of these mixers are summed 50 AC-Coupled Single-ended LO and RF Ports and applied to an on-chip RF transformer, which converts High Impedance Interface to Baseband Inputs the differential mixer signals to a 50 single-ended output. with 2.1V Common Mode Voltage The balanced I and Q baseband input ports are intended 16-Lead QFN 4mm 4mm Package for DC coupling from a source with a common-mode voltage level of about 2.1V. The LO path consists of an LO APPLICATIONS buffer with single-ended input, and precision quadrature generators which produce the LO drive for the mixers. RFID Single-Sideband Transmitters The supply voltage range is 4.5V to 5.25V. Infrastructure T for Cellular and ISM Bands X Image Reject Up-Converters for Cellular Bands , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. Low-Noise Variable Phase-Shifter for 600MHz to 1100MHz Local Oscillator Signals Microwave Links TYPICAL APPLICATION CDMA2000 ACPR, AltCPR and Noise vs 600MHz to 1100MHz Direct Conversion Transmitter Application RF Output Power at 900MHz for 1 and 3 Carriers 5V V 2 x 100nF CC 40 110 8, 13 DOWNLINK TEST MODEL 64 DPCH LT5558 14 50 120 RF = 600MHz TO 3-CH ACPR IDAC V-1 16 1100MHz 3-CH ALTCPR I-CH PA 60 130 11 O 1 1-CH ACPR EN 90 70 140 BALUN Q-CH 7 1-CH NOISE QDAC V-1 5 1-CH ALTCPR 80 150 3-CH NOISE BASEBAND 90 160 30 25 20 15 10 5 0 GENERATOR RF OUTPUT POWER PER CARRIER (dBm) 5558 TA01 3 2, 4, 6, 9, 10, 5558 TA01b 12, 15, 17 VCO/SYNTHESIZER 5558fa 1 ACPR, ALTCPR (dBc)LT5558 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) TOP VIEW ORDER PART NUMBER Supply Voltage ........................................................5.5V LT5558EUF Common-Mode Level of BBPI, BBMI and 16 15 14 13 BBPQ, BBMQ .......................................................2.5V EN 1 12 GND Voltage on any Pin GND 2 11 RF Not to Exceed ....................500mV to (V + 500mV) LO 3 10 GND CC GND 4 9 GND Operating Ambient Temperature 5 6 7 8 UF PART MARKING (Note 2) ............................................... 40C to 85C Storage Temperature Range ................... 65C to 125C 5558 UF PACKAGE 16-LEAD (4mm 4mm) PLASTIC QFN T = 125C, = 37C/W JMAX JA EXPOSED PAD (PIN 17) IS GND, MUST BE SOLDERED TO PCB Order Options Tape and Reel: Add TR Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Lead Free Part Marking: