LTC6401-20 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF FEATURES DESCRIPTION 1.3GHz 3dB Bandwidth The LTC 6401-20 is a high-speed differential ampli er Fixed Gain of 10V/V (20dB) targeted at processing signals from DC to 140MHz. The 93dBc IMD at 70MHz (Equivalent OIP = 50.5dBm) part has been speci cally designed to drive 12-, 14- and 3 3 74dBc IMD at 140MHz (Equivalent OIP = 41dBm) 16-bit ADCs with low noise and low distortion, but can also 3 3 1nV/Hz Internal Op Amp Noise be used as a general-purpose broadband gain block. 2.1nV/Hz Total Input Noise The LTC6401-20 is easy to use, with minimal support 6.2dB Noise Figure circuitry required. The output common mode voltage is Differential Inputs and Outputs set using an external pin, independent of the inputs, which 200 Input Impedance eliminates the need for transformers or AC-coupling ca- 2.85V to 3.5V Supply Voltage pacitors in many applications. The gain is internally xed 50mA Supply Current (150mW) at 20dB (10V/V). 1V to 1.6V Output Common Mode Voltage, The LTC6401-20 saves space and power compared to Adjustable alternative solutions using IF gain blocks and transform- DC- or AC-Coupled Operation ers. The LTC6401-20 is packaged in a compact 16-lead Max Differential Output Swing 4.4V P-P 3mm 3mm QFN package and operates over the 40C Small 16-Lead 3mm 3mm 0.75mm QFN Package to 85C temperature range. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. APPLICATIONS All other trademarks are the property of their respective owners. Differential ADC Driver Differential Driver/Receiver Single Ended to Differential Conversion IF Sampling Receivers SAW Filter Interfacing TYPICAL APPLICATION Single-Ended to Differential ADC Driver Equivalent Output IP3 vs Frequency 70 (NOTE 7) 3.3V 1.25V 60 0.1F + 1000pF 0.1F 3.3V 50 + V 0.1F V OCM 40 10 V V CM DD + INPUT +IN +OUT AIN +OUTF 30 66.5 LTC6401-20 LTC2208 0.1F OUTF 20 OUT AIN IN V 10 29 ENABLE 10 LTC2208 130Msps 16-Bit ADC 20dB GAIN 0 640120 TA01a 0 50 100 150 200 FREQUENCY (MHz) 640120 TA01b 640120f 1 OUTPUT IP3 (dBm)LTC6401-20 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW + Supply Voltage (V V ) .......................................... 3.6V Input Current (Note 2) ..........................................10mA 16 15 14 13 Operating Temperature Range + V 1 12 V (Note 3) ............................................... 40C to 85C V 2 11 ENABLE OCM 17 + + Speci ed Temperature Range V 3 10 V V 4 9 V (Note 4) ............................................... 40C to 85C 5 6 7 8 Storage Temperature Range ................... 65C to 150C Maximum Junction Temperature........................... 150C UD PACKAGE 16-LEAD (3mm 3mm) PLASTIC QFN T = 150C, = 68C/W, = 4.2C/W JMAX JA JC EXPOSED PAD (PIN 17) IS V , MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION TEMPERATURE RANGE LTC6401CUD-20 PBF LTC6401CUD-20 TRPBF LCDB 16-Lead (3mm 3mm) Plastic QFN 0C to 70C LTC6401IUD-20 PBF LTC6401IUD-20 TRPBF LCDB 16-Lead (3mm 3mm) Plastic QFN 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: