LTC5598 High Linearity Direct FEATURES - analog.com

1 LTC559815598f TYPICAL APPLICATION DESCRIPTION5 MHz to 1600 MHz High Linearity Direct Quadrature ModulatorThe LTC 5598 is a Direct I/Q modulator designed for high performance wireless applications, including wireless infrastructure. It allows Direct modulation of an RF signal using differential baseband I and Q signals. It supports point-to-point microwave link, GSM, EDGE, CDMA, 700 MHz band LTE, CDMA2000, CATV applications and other systems. It may also be confi gured as an image reject upconverting mixer, by applying 90 phase-shifted signals to the I and Q inputs. The I/Q baseband inputs consist of voltage-to-current converters that in turn drive double-balanced mixers. The outputs of these mixers are summed and applied to a buffer, which converts the differential mixer signals to a 50 single-ended buffered RF output.

2 The four balanced I and Q baseband input ports are intended for DC coupling from a source with a common-mode voltage level of about The LO path consists of an LO buffer with single-ended or differential inputs, and precision quadrature generators that produce the LO drive for the mixers. The supply voltage range is to , with about 168mA current. 5 MHz to 1600 MHz Direct Conversion Transmitter ApplicationL, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. FEATURES APPLICATIONSn Frequency Range: 5 MHz to 1600 MHzn High Output IP3: + at 140 MHz + at 900 MHzn Low Output Noise Floor at 6 MHz Offset: No Baseband AC Input: POUT = : 160dBm/Hzn Low LO Feedthrough: 55dBm at 140 MHzn High Image Rejection.

3 At 140 MHz n Integrated LO Buffer and LO Quadrature Phase Generatorn 50 Single-Ended LO and RF Ports n > 400 MHz Baseband Bandwidthn 24-Lead QFN 4mm 4mm Packagen Pin-Compatible with Industry Standard Pin-Outn Shut-down Moden Point-to-Point Microwave Linkn Military Radion Basestation Transmitter GSM/EDGE/CDMA2Kn 700 MHz LTE Basestation Transmittern Satellite Communicationn CATV/Cable Broadband Modulatorn RFID Modulator90o0oLTC559810nF50 10nF470nF10nFBASEBANDGENERATORPARF = 5 MHzTO Fx2EN5VV-IV-II-CHANNELQ-CHANNELVCC5598 TA01I-DACQ-DACVCO/SYNTHESIZERRF OUTPUT POWER (dBm)NOISE FLOOR AT 6 MHz OFFSET (dBm/Hz) 152 154 156 158 160 1625598 TA028246 4 2 0 12 10 8 6 14fLO = 140 MHz; fBB = 2kHz; CW (NOTE 3) Floor vs RF Output Powerand Differential LO Input PowerLTC559825598f PIN CONFIGURATION ABSOLUTE MAXIMUM RATINGSS upply Voltage.

4 Mode Level of BBPI, BBMI and BBPQ, BBMQ .. , LOM Input ..20dBmVoltage on Any PinNot to Exceed .. to VCC + .. 150 COperating Temperature 40 C to 85 CStorage Temperature Range .. 65 C to 150 C(Note 1)242322212019789 TOP VIEWUF PACKAGE24-LEAD (4mm s 4mm) PLASTIC QFN10111265432521131415161718 ENGNDLOPLOMGNDCAPAVCC2 GNDRFRFNCGNDRFNCVCC1 GNDBBMIBBPIGNDGNDCAPBGNDBBMQBBPQGNDGNDTJ MAX = 150 C, JA = 37 C/WEXPOSED PAD (PIN 25) IS GND, MUST BE SOLDERED TO PCBORDER INFORMATIONLEAD FREE FINISHTAPE AND REELPART MARKINGPACKAGE DESCRIPTIONTEMPERATURE RANGELTC5598 IUF#PBFLTC5598 IUF#TRPBF559824-Lead (4mm 4mm) Plastic QFN 40 C to 85 CConsult LTC Marketing for parts specifi ed with wider operating temperature LTC Marketing for information on non-standard lead based fi nish more information on lead free part marking, go to: For more information on tape and reel specifi cations, go to.

5 OUTPUT (RF)fRFRF Frequency Range5 to 1600 MHzS22, ONRF Output Return LossEN = High, 5 MHz to 1600 MHz< 20dBfLO = 140 MHz, fRF = Voltage Gain20 Log (VRF, OUT, 50 /VIN, DIFF, I or Q) 2dBPOUTA bsolute Output Power1 VPP,DIFF on each I&Q Inputs2dBmOP1dBOutput 1dB 2nd Order Intercept(Notes 4, 5)74dBmOIP3 Output 3rd Order Intercept(Notes 4, 6) Output Noise FloorNo Baseband AC Input Signal (Note 3)POUT = (Note 3) PLO, SE = 10dBmPOUT = (Note 3) PLO, DIFF = 20dBm 160dBm/HzdBm/HzdBm/HzIRImage Rejection(Note 7) Feedthrough(Carrier Leakage)EN = High (Note 7)EN = Low (Note 7) 55 78dBmdBmfLO = 450 MHz, fRF = Voltage Gain20 Log (VRF, OUT, 50 /VIN, DIFF, I or Q) Output Power1 VPP,DIFF on each I&Q 1dB 2nd Order Intercept(Notes 4, 5)72dBmOIP3 Output 3rd Order Intercept(Notes 4, 6) Output Noise FloorNo Baseband AC Input Signal (Note 3) Rejection(Note 7) 55dBcLOFTLO Feedthrough(Carrier Leakage)EN = High (Note 7)EN = Low (Note 7) 51 68dBmdBmfLO = 900 MHz, fRF = Voltage Gain20 Log (VRF, OUT, 50 /VIN, DIFF, I or Q) 2dBPOUTA bsolute Output Power1 VPP,DIFF on each I&Q Inputs2dBmOP1dBOutput 1dB 2nd Order Intercept(Notes 4, 5)69dBmOIP3 Output 3rd Order Intercept(Notes 4, 6) Output Noise FloorNo Baseband AC Input Signal (Note 3)POUT = (Note 3) PLO, SE = 10dBm Rejection(Note 7) 54dBcLOFTLO Feedthrough(Carrier Leakage)EN = High (Note 7)EN = Low (Note 7) 48 54dBmdBm ELECTRICAL CHARACTERISTICS VCC = 5V, EN = 5V, TA = 25 C, PLO = 0dBm, single-ended.

6 BBPI, BBMI, BBPQ, BBMQ common-mode DC voltage VCMBB = , I&Q baseband input signal = 100kHz CW, ,DIFF each, I&Q 90 shifted (lower side-band selection), unless otherwise noted. (Note 11)LTC559845598f ELECTRICAL CHARACTERISTICS VCC = 5V, EN = 5V, TA = 25 C, PLO = 0dBm, single-ended; BBPI, BBMI, BBPQ, BBMQ common-mode DC voltage VCMBB = , I&Q baseband input signal = 100kHz CW, ,DIFF each, I&Q 90 shifted (lower side-band selection), unless otherwise noted. (Note 11)SYMBOLPARAMETERCONDITIONSMINTYPMAXUNI TSLO INPUT (LOP)fLOLO Frequency Range5 to 1600 MHzPLO,DIFFD ifferential LO Input Power Range 10 to 20dBmPLO, SESingle-Ended LO Input Power Range 10 to 12dBmS11, ONLO Input Return LossEN = High , OFFLO Input Return LossEN = Low INPUTS (BBPI, BBMI, BBPQ, BBMQ)BWBBB aseband Bandwidth-3dB Bandwidth>400 MHzIb,BBBaseband Input CurrentSingle-Ended 68 ARIN, SEInput ResistanceSingle-Ended VCMBBDC Common-Mode VoltageExternally SwingNo Hard Clipping, SUPPLY (VCC1, VCC2)VCCS upply (ON)Supply CurrentEN = High, ICC1+ ICC2130165200mAICC(OFF)Supply Current, Sleep ModeEN = 0V, ICC1+ TimeEN = Low to High (Notes 8, 10)75nstOFFTurn-Off TimeEN = High to Low (Notes 9, 10)

7 10nsPOWER UP/DOWNE nableInput High VoltageInput High CurrentEN = HighEN = 5V243V ASleepInput Low VoltageInput Low CurrentEN = LowEN = 0V 401V ANote 1: Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. Exposure to any Absolute Maximum Rating condition for extended periods may affect device reliability and 2: The LTC5598 is guaranteed functional over the operating temperature range 40 C to 85 3: At 6 MHz offset from the LO signal frequency. 100nF between BBPI and BBMI, 100nF between BBPQ and 4: Baseband is driven by 2 MHz and tones with 1 VPP,DIFF for two-tone signals at each I or Q input ( ,DIFF for each tone).Note 5: IM2 is measured at LO frequency 6: IM3 is measured at LO frequency MHz and LO frequency 7: Amplitude average of the characterization data set without image or LO feedthrough nulling (unadjusted).

8 Note 8: RF power is within 10% of fi nal 9: RF power is at least 30dB lower than in the ON 10: External coupling capacitors at pins LOP, LOM and RF are 100pF 11: Tests are performed as shown in the confi guration of Figure 10. The LO power is applied to J3 while J5 is terminated with 50 to ground for single-ended LO TYPICAL PERFORMANCE CHARACTERISTICSTEMPERATURE ( C) 40140 SUPPLY CURRENT (mA)17016015018085 1510355598 IP2 vs RF FrequencyOutput 1dB Compression vs RF FrequencyLO Feedthrough to RF Output vs LO FrequencyImage Rejection vs LO FrequencyNoise Floor vs RF Frequency (No AC Baseband Input Signal)Supply Current vs TemperatureVoltage Gain vs RF FrequencyOutput IP3 vs RF Frequency VCC = 5V, EN = 5V, TA = 25 C, fRF = fLO fBB, PLO = 0dBm single-ended, BBPI, BBMI, BBPQ, BBMQ common-mode DC voltage VCMBB = , I&Q baseband input signal = 100kHz, ,DIFF, two-tone baseband input signal = 2 MHz, , ,DIFF each tone, I&Q 90 shifted (lower side-band selection); fNOISE = fLO 6 MHz.

9 Unless otherwise noted. (Note 11) RF Two-Tone Power (Each Tone), IM2 and IM3 vs RF FrequencyRF FREQUENCY (MHz)VOLTAGE GAIN (dB) 1 3 2 4 510005598 G02100105V, 25 , 25 , 25 C5V, 40 C5V, 85 CRF FREQUENCY (MHz)OIP3 (dBm)2921232725191710005598 G03100105V, 25 , 25 , 25 C5V, 40 C5V, 85 CRF FREQUENCY (MHz)OIP2 (dBm)857075806560555598 G041001000105V, 25 , 25 , 25 C5V, 40 C5V, 85 CRF FREQUENCY (MHz)OP1dB (dBm)10684205598 G051001000105V, 25 , 25 , 25 C5V, 40 C5V, 85 CLO FREQUENCY (MHz)LO FEEDTHROUGH (dBm) 40 50 60 705598 G061001000105V, 25 , 25 , 25 C5V, 40 C5V, 85 CLO FREQUENCY (MHz)IMAGE REJECTION (dBc) 20 30 40 50 60 705598 G071001000105V, 25 , 25 , 25 C5V, 40 C5V, 85 CRF FREQUENCY (MHz)NOISE FLOOR (dBm/Hz) 145 155 150 160 1655598 G081001000105V, 25 , 25 , 25 C5V, 40 C5V, 85 C(NOTE 3)

10 RF FREQUENCY (MHz)PRF,TONE (dBm)IM2 (dBm), IM3 (dBm)0 50 40 30 20 10 60 40 90 80 70 60 50 1005598 G09100010010fRF, EACH = fLO fBB1fIM3 = fLO + 2*fBB1+fBB2fIM3 = fLO 2*fBB1+fBB2fIM2 = fLO fBB1 fBB2 LTC559865598fLO Feedthrough to RF Output vs LO Frequency (PLO = 10dBm)Image Rejection vs LO Frequency (PLO = 10dBm)RF Two-Tone Power (Each Tone), IM2 and IM3 vs RF Frequency (PLO = 10dBm)Output IP3 vs RF Frequency (PLO = 10dBm)Output IP2 vs RF Frequency (PLO = 10dBm)Output 1dB Compression vs RF Frequency (PLO = 10dBm) TYPICAL PERFORMANCE CHARACTERISTICS VCC = 5V, EN = 5V, TA = 25 C, fRF = fLO fBB, PLO = 0dBm single-ended, BBPI, BBMI, BBPQ, BBMQ common-mode DC voltage VCMBB = , I&Q baseband input signal = 100kHz, ,DIFF, two-tone baseband input signal = 2 MHz, , ,DIFF each tone, I&Q 90 shifted (lower side-band selection); fNOISE = fLO 6 MHz; unless otherwise noted.