LT6600-20 Very Low Noise, Differential Ampli er and 20MHz Lowpass Filter FEATURES DESCRIPTION n Programmable Differential Gain via Two External The LT 6600-20 combines a fully differential ampli er with a Resistors 4th order 20MHz lowpass lter approximating a Chebyshev n Adjustable Output Common Mode Voltage frequency response. Most differential ampli ers require n Operates and Speci ed with 3V, 5V, 5V Supplies many precision external components to tailor gain and n 0.5dB Ripple 4th Order Lowpass Filter with 20MHz bandwidth. In contrast, with the LT6600-20, two external Cutoff resistors program differential gain, and the lters 20MHz n 76dB S/N with 3V Supply and 2V Output cutoff frequency and passband ripple are internally set. P-P n Low Distortion, 2V , 800 Load The LT6600-20 also provides the necessary level shifting P-P 2.5MHz: 83dBc 2nd, 88dBc 3rd to set its output common mode voltage to accommodate 20MHz: 63dBc 2nd, 64dBc 3rd the reference voltage requirements of A/Ds. n Fully Differential Inputs and Outputs Using a proprietary internal architecture, the LT6600-20 n SO-8 Package integrates an antialiasing lter and a differential ampli- n Compatible with Popular Differential Ampli er er/driver without compromising distortion or low noise Pinouts performance. At unity gain the measured in band signal- to-noise ratio is an impressive 76dB. At higher gains the APPLICATIONS input referred noise decreases so the part can process smaller input differential signals without signi cantly n High Speed ADC Antialiasing and DAC Smoothing in degrading the output signal-to-noise ratio. Networking or Cellular Base Station Applications n The LT6600-20 also features low voltage operation. The High Speed Test and Measurement Equipment n differential design provides outstanding performance for Medical Imaging n a 2V signal level while the part operates with a single Drop-in Replacement for Differential Ampli ers P-P 3V supply. L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. The LT6600-20 is packaged in an SO-8 and is pin compat- ible with stand alone differential ampli ers. TYPICAL APPLICATION An 8192 Point FFT Spectrum 0 INPUT 5.9MHz 10 2V LT6600-20 A/D P-P 20 f = 80MHz LTC1748 SAMPLE 5V 30 0.1F 5V 40 R IN 50 3 402 + 1 49.9 V 60 4 + 7 + V 70 MID D 18pF A IN OUT 2 49.9 80 V 0.01F OCM 8 90 5 V + IN V V CM R 6 100 IN 402 110 1F 120 GAIN = 402/R IN 0 20 40 10 30 66002 TA01a FREQUENCY (MHz) 66002 TA01b 66002fb 1 AMPLITUDE (dB)LT6600-20 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Total Supply Voltage .................................................11V + IN 1 8 IN Input Current (Note 8) ..........................................10mA V 2 7 V OCM MID Operating Temperature Range (Note 6).... 40C to 85C + V V 3 6 Speci ed Temperature Range (Note 7) .... 40C to 85C + OUT OUT 4 5 Junction Temperature ........................................... 150C S8 PACKAGE Storage Temperature Range ................... 65C to 150C 8-LEAD PLASTIC SO Lead Temperature (Soldering, 10 sec) .................. 300C T = 150C, = 100C/W JMAX JA ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT6600CS8-20 PBF LT6600CS8-20 TRPBF 660020 8-Lead Plastic SO 40C to 85C LT6600IS8-20 PBF LT6600IS8-20 TRPBF 600I20 8-Lead Plastic SO 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT6600CS8-20 LT6600CS8-20 TR 660020 8-Lead Plastic SO 40C to 85C LT6600IS8-20 LT6600IS8-20 TR 600I20 8-Lead Plastic SO 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. For more information on lead free part marking, go to: