NOISE FLOOR AT 30MHz OFFSET (dBm/Hz) LT5528 1.5GHz to 2.4GHz High Linearity Direct Quadrature Modulator FEATURES DESCRIPTIO Direct Conversion to 1.5GHz to 2.4GHz The LT 5528 is a direct I/Q modulator designed for high High OIP3: 21.8dBm at 2GHz performance wireless applications, including wireless Low Output Noise Floor at 5MHz Offset: infrastructure. It allows direct modulation of an RF signal No RF: 159.3dBm/Hz using differential baseband I and Q signals. It supports P = 4dBm: 151.8dBm/Hz PHS, GSM, EDGE, TD-SCDMA, CDMA, CDMA2000, OUT 4-Ch W-CDMA ACPR: 66dBc at 2.14GHz W-CDMA and other systems. It may also be con gured Integrated LO Buffer and LO Quadrature Phase as an image reject up-converting mixer, by applying Generator 90 phase-shifted signals to the I and Q inputs. The I/Q 50 AC-Coupled Single-Ended LO and RF Ports baseband inputs consist of voltage-to-current converters 50 DC Interface to Baseband Inputs that in turn drive double-balanced mixers. The outputs of Low Carrier Leakage: 42dBm at 2GHz these mixers are summed and applied to an on-chip RF High Image Rejection: 45dB at 2GHz transformer, which converts the differential mixer signals 16-Lead QFN 4mm 4mm Package to a 50 single-ended output. The four balanced I and Q baseband input ports are intended for DC coupling from a U source with a common-mode voltage level of about 0.5V. APPLICATIO S The LO path consists of an LO buffer with single-ended Infrastructure Tx for DCS, PCS and UMTS Bands input, and precision quadrature generators that produce Image Reject Up-Converters for PCS and UMTS the LO drive for the mixers. The supply voltage range is Bands 4.5V to 5.25V. Low-Noise Variable Phase-Shifter for 1.5GHz to , LTC and LT are registered trademarks of Linear Technology Corporation. 2.4GHz Local Oscillator Signals TYPICAL APPLICATIO 1.5GHz to 2.4GHz Direct Conversion Transmitter Application W-CDMA ACPR, AltCPR and Noise vs RF Output with LO Feed-Through and Image Calibration Loop Power at 2140MHz for 1, 2 and 4 Channels 5V V CC 8, 13 55 140 DOWNLINK TEST MODEL 64 DPCH LT5528 14 RF = 1.5GHz TO 2.4GHz I-DAC V-I 16 60 145 I-CHANNEL 11 PA 0 1 4-CH ACPR 65 150 EN 2-CH ACPR 90 BALUN 2-CH AltCPR Q-CHANNEL LO FEED-THROUGH CAL OUT 4-CH AltCPR 7 70 1-CH ACPR 155 Q-DAC 5 V-I IMAGE CAL OUT 1-CH AltCPR CAL 4-CH NOISE 75 160 BASEBAND 3 2, 4, 6, 9, 10, 12, 15, 17 DSP VCO/SYNTHESIZER 1-CH NOISE 80 165 42 38 34 30 26 22 18 14 ADC RF OUTPUT POWER PER CARRIER (dBm) 5528 TA01a 5528 TA01b 5528f 1 ACPR, AltCPR (dBc) U ULT5528 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) TOP VIEW ORDER PART Supply Voltage .........................................................5.5V NUMBER Common-Mode Level of BBPI, BBMI and 16 15 14 13 EN 1 12 GND BBPQ, BBMQ .......................................................2.5V LT5528EUF GND 2 11 RF Operating Ambient Temperature 17 LO 3 10 GND (Note 2) ...............................................40C to 85C GND 4 9 GND Storage Temperature Range .................. 65C to 125C 5 6 7 8 UF PART Voltage on Any Pin MARKING Not to Exceed ......................500mV to V + 500mV UF PACKAGE CC 16-LEAD (4mm 4mm) PLASTIC QFN 5528A T = 125C, = 37C/W JMAX JA EXPOSED PAD IS GROUND (PIN 17) MUST BE SOLDERED TO PCB. Consult LTC Marketing for parts speci ed with wider operating temperature ranges. VELECTRICAL CHARACTERISTICS = 5V, EN = High, T = 25C, f = 2GHz, f = 2.002GHz, P = 0dBm. CC A LO RF LO BBPI, BBMI, BBPQ, BBMQ inputs 0.525V , Baseband Input Frequency = 2MHz, I&Q 90 shifted (upper sideband selection). DC P = 10dBm, unless otherwise noted. (Note 3) RF, OUT SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS RF Output (RF) f RF Frequency Range 3dB Bandwidth 1.5 to 2.4 GHz RF RF Frequency Range 1dB Bandwidth 1.7 to 2.2 GHz S RF Output Return Loss EN = High (Note 6) 15 dB 22, ON S RF Output Return Loss EN = Low (Note 6) 12 dB 22, OFF NFloor RF Output Noise Floor No Input Signal (Note 8) 159.3 dBm/Hz P = 4dBm (Note 9) 151.8 dBm/Hz OUT P = 4dBm (Note 10) 151.8 dBm/Hz OUT G Conversion Power Gain P /P 6.5 dB P OUT IN, I&Q G Conversion Voltage Gain 20 Log (V /V ) 6 dB V OUT, 50 IN, DIFF, I or Q P Absolute Output Power 1V CW Signal, I and Q 2.1 dBm OUT P-P DIFF G 3 LO Conversion Gain Difference (Note 17) 28 dB 3LO vs LO OP1dB Output 1dB Compression (Note 7) 7.9 dBm OIP2 Output 2nd Order Intercept (Notes 13, 14) 49 dBm OIP3 Output 3rd Order Intercept (Notes 13, 15) 21.8 dBm IR Image Rejection (Note 16) 45 dBc LOFT Carrier Leakage EN = High, P = 0dBm (Note 16) 42 dBm LO (LO Feed-Through) EN = Low, P = 0dBm (Note 16) 57.8 dBm LO LO Input (LO) f LO Frequency Range 1.5 to 2.4 GHz LO P LO Input Power 10 0 5 dBm LO S LO Input Return Loss EN = High (Note 6) 17 dB 11, ON S LO Input Return Loss EN = Low (Note 6) 5.5 dB 11, OFF NF LO Input Referred Noise Figure (Note 5) at 2GHz 14.4 dB LO G LO to RF Small Signal Gain (Note 5) at 2GHz 20.4 dB LO IIP3 LO Input 3rd Order Intercept (Note 5) at 2GHz 10 dBm LO 5528f 2 BBMQ BBMI GND GND BBPQ BBPI V V CC CC U WWW