LT6600-15 Very Low Noise, Differential Ampli er and 15MHz Lowpass Filter FEATURES DESCRIPTION n Programmable Differential Gain via Two External The LT 6600-15 combines a fully differential ampli er with a Resistors 4th order 15MHz 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 15MHz bandwidth. In contrast, with the LT6600-15, two external resistors program differential gain, and the lters 15MHz Cutoff n cutoff frequency and passband ripple are internally set. 76dB S/N with 3V Supply and 2V Output P-P n The LT6600-15 also provides the necessary level shifting Low Distortion, 2V , 800 Load, V = 3V P-P S to set its output common mode voltage to accommodate 1MHz: 86dBc 2nd, 90dBc 3rd the reference voltage requirements of A/Ds. 10MHz: 63dBc 2nd, 69dBc 3rd n Fully Differential Inputs and Outputs Using a proprietary internal architecture, the LT6600-15 n Compatible with Popular Differential Ampli er integrates an antialiasing lter and a differential ampli er/ Pinouts driver without compromising distortion or low noise perfor- n SO-8 Package mance. At unity gain the measured in band signal-to-noise ratio is an impressive 76dB. At higher gains the input referred noise decreases so the part can process smaller APPLICATIONS input differential signals without signi cantly degrading n High Speed ADC Antialiasing and DAC Smoothing in the output signal-to-noise ratio. Networking or Cellular Base Station Applications The LT6600-15 also features low voltage operation. The n High Speed Test and Measurement Equipment differential design provides outstanding performance for n Medical Imaging a 2V signal level while the part operates with a single P-P n Drop-In Replacement for Differential Ampli ers 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 LT6600-15 is packaged in an SO-8 and is pin compat- ible with standalone differential ampli ers. TYPICAL APPLICATION An 8192 Point FFT Spectrum 0 LTC2249 LT6600-15 INPUT 10.7MHz 10 2V 3V P-P 20 f = 80MHz SAMPLE 0.1F 3V 30 R IN 5.6pF 40 3 536 + 1 25 V 50 4 + 7 + 60 V MID A D 5.6pF OUT 2 IN 70 25 V 0.01F OCM 8 80 5 V + IN 5.6pF V CM V 90 R IN 6 536 100 2.2F 110 GAIN = 536/R IN 120 660015 TA01a 0 10 20 30 40 FREQUENCY (MHz) 660015 TA01b 660015fb 1 AMPLITUDE (dB)LT6600-15 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Total Supply Voltage .................................................11V + Input Current (Note 8) ..........................................10mA IN 1 8 IN Operating Temperature Range (Note 6).... 40C to 85C V 2 7 V OCM MID + Speci ed Temperature Range (Note 7) .... 40C to 85C V V 3 6 + Junction Temperature ........................................... 150C OUT OUT 4 5 Storage Temperature Range ...................65C to 150C S8 PACKAGE 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 LT6600CS8-15 PBF LT6600CS8-15 TRPBF 660015 8-Lead Plastic SO 40C to 85C LT6600IS8-15 PBF LT6600IS8-15 TRPBF 600I15 8-Lead Plastic SO 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION TEMPERATURE RANGE LT6600CS8-15 LT6600CS8-15 TR 660015 8-Lead Plastic SO 40C to 85C LT6600IS8-15 LT6600IS8-15 TR 600I15 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: