LTC5598 5MHz to 1600MHz High Linearity Direct Quadrature Modulator FEATURES DESCRIPTION n Frequency Range: 5MHz to 1600MHz The LTC 5598 is a direct I/Q modulator designed for high n High Output IP3: +27.7dBm at 140MHz performance wireless applications, including wireless +22.9dBm at 900MHz infrastructure. It allows direct modulation of an RF signal n Low Output Noise Floor at 6MHz Offset: using differential baseband I and Q signals. It supports No Baseband AC Input: 161.2dBm/Hz point-to-point microwave link, GSM, EDGE, CDMA, P = 5.5dBm: 160dBm/Hz 700MHz band LTE, CDMA2000, CATV applications and OUT n Low LO Feedthrough: 55dBm at 140MHz other systems. It may also be con gured as an image n High Image Rejection: 50.4dBc at 140MHz reject upconverting mixer, by applying 90 phase-shifted n Integrated LO Buffer and LO Quadrature Phase signals to the I and Q inputs. Generator The I/Q baseband inputs consist of voltage-to-current n 50 Single-Ended LO and RF Ports converters that in turn drive double-balanced mixers. n >400MHz Baseband Bandwidth The outputs of these mixers are summed and applied n 24-Lead QFN 4mm 4mm Package to a buffer, which converts the differential mixer signals n Pin-Compatible with Industry Standard Pin-Out to a 50 single-ended buffered RF output. The four n Shut-down Mode balanced I and Q baseband input ports are intended for DC coupling from a source with a common-mode voltage APPLICATIONS level of about 0.5V. The LO path consists of an LO buffer n Point-to-Point Microwave Link with single-ended or differential inputs, and precision n Military Radio quadrature generators that produce the LO drive for the n Basestation Transmitter GSM/EDGE/CDMA2K mixers. The supply voltage range is 4.5V to 5.25V, with n 700MHz LTE Basestation Transmitter about 168mA current. n Satellite Communication L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n CATV/Cable Broadband Modulator n 13.56MHz/UHF RFID Modulator TYPICAL APPLICATION Noise Floor vs RF Output Power 5MHz to 1600MHz Direct Conversion Transmitter Application and Differential LO Input Power 5V 152 1nF 4.7F V f = 140MHz f = 2kHz CW (NOTE 3) CC LO BB x2 x2 LTC5598 20dBm RF = 5MHz 154 19.3dBm I-DAC V-I TO 1600MHz 13.4dBm 10.4dBm I-CHANNEL 8.4dBm 156 0o 6.4dBm PA EN 90o 10nF Q-CHANNEL 158 Q-DAC V-I 160 5598 TA01 BASEBAND GENERATOR 10nF 162 10nF 470nF 50 14 12 10 8 6 4 2 0 246 8 VCO/SYNTHESIZER RF OUTPUT POWER (dBm) 5598 TA02 5598f 1 NOISE FLOOR AT 6MHz OFFSET (dBm/Hz)LTC5598 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Supply Voltage .........................................................5.6V Common Mode Level of BBPI, BBMI and BBPQ, BBMQ ...........................................................0.6V 24 23 22 21 20 19 LOP, LOM Input ....................................................20dBm EN 1 18 V CC2 Voltage on Any Pin GND 2 17 GNDRF Not to Exceed ...................................0.3V to V + 0.3V CC LOP 3 16 RF 25 T .................................................................... 150C LOM 4 15 NC JMAX GND GNDRF 5 14 Operating Temperature Range..................40C to 85C CAPA 6 13 NC Storage Temperature Range ...................65C to 150C 7 8 9 10 11 12 UF PACKAGE 24-LEAD (4mm s 4mm) PLASTIC QFN T = 150C, = 37C/W JMAX JA EXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LTC5598IUF PBF LTC5598IUF TRPBF 5598 40C to 85C 24-Lead (4mm 4mm) Plastic QFN Consult LTC Marketing for parts speci ed with wider operating temperature ranges. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: