LTC6401-8 2.2GHz Low Noise, Low Distortion Differential ADC Driver for DC-140MHz FEATURES DESCRIPTION 2.2GHz 3dB Bandwidth The LTC 6401-8 is a high-speed differential ampli er tar- Fixed Gain of 2.5V/V (8dB) geted at processing signals from DC to 140MHz. The part 92dBc IMD3 at 70MHz (Equivalent OIP3 = 50dBm) has been speci cally designed to drive 12-, 14- and 16-bit 80.5dBc IMD3 at 140MHz (Equivalent OIP3 = 44dBm) ADCs with low noise and low distortion, but can also be 1nV/Hz Internal Op Amp Noise used as a general-purpose broadband gain block. 12.1dB Noise Figure The LTC6401-8 is easy to use, with minimal support cir- Differential Inputs and Outputs cuitry required. The output common mode voltage is set 400 Input Impedance using an external pin, independent of the inputs, which 2.85V to 3.5V Supply Voltage eliminates the need for transformers or AC-coupling ca- 45mA Supply Current (135mW) pacitors in many applications. The gain is internally xed 1V to 1.6V Output Common Mode, Adjustable at 8dB (2.5V/V). DC- or AC-Coupled Operation The LTC6401-8 saves space and power compared to al- Max Differential Output Swing 4.6V P-P ternative solutions using IF gain blocks and transformers. Small 16-Lead 3mm 3mm 0.75mm QFN Package The LTC6401-8 is packaged in a compact 16-lead 3mm 3mm QFN package and operates over the 40C to 85C APPLICATIONS temperature range. , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Differential ADC Driver All other trademarks are the property of their respective owners. Differential Driver/Receiver Single Ended to Differential Conversion IF Sampling Receivers SAW Filter Interfacing TYPICAL APPLICATION 3.3V 3.3V Equivalent Output IP3 vs Frequency 60 (NOTE 7) C2 C1 C F2 0.1F 1000pF 33pF 50 + V C3 R R S1 S3 0.1F 40 15 10 V + DD +OUT AIN V +IN IN 30 R1 C4 L1 C F1 LTC6401-8 LTC2208 59.0 R R 0.1F S2 24nH 33pF S4 15 10 20 IN OUT AIN V V CM OCM R2 C F3 COILCRAFT 27.4 V 33pF LTC2208 10 0603CS 130Msps 1.25V 16-Bit ADC 64018 TA01a 0 0 20 40 60 80 100 120 140 160 180 200 C5 R3 0.1F 100 FREQUENCY (MHz) 64018 TA01b 64018f 1 OUTPUT IP3 (dBm)LTC6401-8 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Supply Voltage (V V ) ......................................3.6V CC EE 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 SPECIFIED TEMPERATURE RANGE LTC6401CUD-8 PBF LTC6401CUD-8 TRPBF LCCY 16-Lead (3mm 3mm) Plastic QFN 0C to 70C LTC6401IUD-8 PBF LTC6401IUD-8 TRPBF LCCY 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: