16-Bit 2.5Gsps DAC LTC2000 SFDR vs Output Frequency 100 0 - 40mA 95 90 32-lane DDR LVDS LTC2000 SFDR (dBc) 85 LTC2000 Data Clock 625MHz 1.25 Gsps 80 2.5 Gsps 75 70 1.2 Gsps 65 60 40 - 0mA Competition 55 50 0 100 2.4 Gsps 200 300 400 500 600 700 800 900 1000 Output Frequency (MHz) 2.5GHz With >78dBc 2-Tone IMD Up to 1GHz, the LTC2000 Is Ideal for Direct RF Synthesis The LTC®2000 is a 2.5Gsps current steering DAC that offers unparalleled linearity to directly synthesize RF signals up to 1GHz with exceptional spectral purity. With a nominal output current of 40mA, the LTC2000 is capable of generating an output that is ±1V compliant into a 100Ω differential load, which is matched with its internal impedance – resulting in outstanding signal integrity. The LTC2000 has very low additive phase noise and remarkably low latency (only 7.5 cycles for single port and only 11 cycles for dual port). Features nn nn nn nn nn nn 80dBc SFDR at 70MHz fOUT and >68dBc Up to 1000MHz fOUT >78dBc 2-Tone IMD from DC to 1000MHz 40mA Nominal Full-Scale (10mA to 60mA Range), ±1V Output Compliant –165dBc/Hz Additive Phase Noise at 1MHz Offset from 65MHz fOUT Single or Dual Port DDR LVDS and DHSTL Interface Low Latency 157 Carrier DOCSIS Gap Channel Narrowband ACLR, fDAC = 2.5Gsps 2-Tone IMD vs fOUT and fDAC 110 –30 DIGITAL AMPLITUDE = –6dBFS F2 = F1 + 1.25MHz LIN_DIS = 1 100 –40 –50 RBW = 30kHz, VBW = 3kHz REF = –30dBm, ATTEN = 5dB SWEEP = 24s 90 Exceptional linearity, even at high output frequencies, leads to exceptional real-world results in demanding applications. 80 2.5Gsps 2.0Gsps 1.6Gsps 1.25Gsps 70 60 0 200 400 600 800 fOUT (MHz) 1000 1200 10dB/DIV IMD (dBC) –60 –70 –80 –90 –100 –110 –120 –130 481 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. 491 501 511 521 FREQUENCY (MHz) 531 –165dBc/Hz Additive Phase Noise at 1MHz Offset from 65MHz Output Additive Phase Noise, fOUT = 65MHz, fDAC = 2.5Gsps –100 The LTC2000 was designed for low additive phase noise, making it ideal for demanding applications such as radar, instrumentation, and test equipment. PHASE NOISE (dBc/Hz) –110 –120 –130 –140 –150 –160 –170 –180 0.01 100 0.1 1 10 OFFSET FREQUENCY (kHz) 1000 Low Latency Single-Port Operation DBP/N[15:0] N N+1 N+2 N+3 N+4 N+5 Dual-Port Operation N+6 N+6 N+7 DCKIP/N DAP/N[15:0] N N+2 N+4 N+6 N+8 N+10 DBP/N[15:0] N+1 N+3 N+5 N+7 N+9 N+11 DCKIP/N CKP/N 0.5 1.5 2.5 3.5 4.5 IOUTP/N 5.5 6.5 7.5 CKP/N N 1 7.5 CYCLE LATENCY 2 3 4 5 6 7 IOUTP/N That’s It! 8 9 10 11 N N+1 10 CYCLE LATENCY 11 CYCLE LATENCY LTDACGen Software Simplifies the Evaluation of the LTC2000 Define View and Generate www.linear.com/2000 n 1-800-4-LINEAR 0714