LT6600-2.5 Very Low Noise, Differential Ampli er and 2.5MHz Lowpass Filter FEATURES DESCRIPTION n 0.6dB (Max) Ripple 4th Order Lowpass Filter with The LT 6600-2.5 combines a fully differential ampli er 2.5MHz Cutoff with a 4th order 2.5MHz lowpass lter approximating a n Programmable Differential Gain via Two External Chebyshev frequency response. Most differential ampli- Resistors ers require many precision external components to tail n Adjustable Output Common Mode Voltage or gain and bandwidth. In contrast, with the LT6600-2.5, n Operates and Speci ed with 3V, 5V, 5V Supplies two external resistors program differential gain, and the n 86dB S/N with 3V Supply and 1V Output lters 2.5MHz cutoff frequency and passband ripple are RMS n Low Distortion, 1V , 800 Load internally set. The LT6600-2.5 also provides the necessary RMS 1MHz: 95dBc 2nd, 88dBc 3rd level shifting to set its output common mode voltage to ac- n Fully Differential Inputs and Outputs commodate the reference voltage requirements of A/Ds. n Compatible with Popular Differential Ampli er Using a proprietary internal architecture, the LT6600-2.5 Pinouts integrates an antialiasing lter and a differential ampli- n SO-8 and DFN-12 Packages er/driver without compromising distortion or low noise performance. At unity gain the measured in band signal- to-noise ratio is an impressive 86dB. At higher gains the APPLICATIONS input referred noise decreases so the part can process n High Speed ADC Antialiasing and DAC Smoothing in smaller input differential signals without signi cantly Networking or Cellular Basestation Applications degrading the output signal-to-noise ratio. n High Speed Test and Measurement Equipment The LT6600-2.5 also features low voltage operation. The n Medical Imaging differential design provides outstanding performance for a n Drop-in Replacement for Differential Ampli ers 4V signal level while the part operates with a single 3V P-P 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. supply. The LT6600-2.5 is available in SO-8 and DFN-12 packages. For similar devices with higher cutoff frequency, refer to the LT6600-5, LT6600-10, LT6600-15 and LT6600-20 data sheets. (S8 Pin Numbers Shown) TYPICAL APPLICATION DAC Output Filter DAC Output Spectrum LT6600-2.5 Output Spectrum 0 0 5V 10 10 0.1F 5V 20 20 BASEBAND SIGNAL 52.3 1580 3 1 30 30 LADCOM 4 + V I OUT OUT A 7 + 16-BIT 4kHz to 2.5MHz 40 40 LT6600-2.5 52.3 DISCRETE MULTI-TONE LTC1668 2 DAC OUTPUT IMAGE 50 50 SIGNAL AT 50MSPS I V OUT B 8 OUT 5 + CLK 60 60 6 1580 0.1F 70 70 5V 50MHz 80 80 5V 90 90 660025 TA01a 0 12 24 36 48 60 72 84 96 108 120 0 12 24 36 48 60 72 84 96 108 120 FREQUENCY (MHz) FREQUENCY (MHz) 660025 TA01b 660025 TA01c 660025fe 1 (dBm) (dBm)LT6600-2.5 (Note 1) ABSOLUTE MAXIMUM RATINGS Total Supply Voltage .................................................11V Junction Temperature ........................................... 150C Input Current (Note 8) ..........................................10mA Storage Temperature Range ................... 65C to 150C Operating Temperature Range (Note 6).... 40C to 85C Lead Temperature (Soldering, 10 sec) .................. 300C Speci ed Temperature Range (Note 7) .... 40C to 85C PIN CONFIGURATION TOP VIEW TOP VIEW + 1 12 IN IN + 2 NC IN 1 8 IN NC 11 3 V V 10 OCM MID V 2 7 V OCM MID 12 + 4 V 9 V + V 3 6 V NC 5 8 V + + OUT 4 5 OUT OUT 6 7 OUT S8 PACKAGE DF PACKAGE 8-LEAD PLASTIC SO 12-LEAD (4mm 4mm) PLASTIC DFN T = 150C, = 100C/W T = 150C, = 43C/W, = 4C/W JMAX JA JMAX JA JC EXPOSED PAD (PIN 13) IS V , MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6600CS8-2.5 PBF LT6600CS8-2.5 TRPBF 660025 8-Lead Plastic SO 0C to 70C LT6600IS8-2.5 PBF LT6600IS8-2.5 TRPBF 600I25 8-Lead Plastic SO 40C to 85C LT6600CDF-2.5 PBF LT6600CDF-2.5 TRPBF 60025 12-Lead (4mm 4mm) Plastic DFN 0C to 70C LT6600IDF-2.5 PBF LT6600IDF-2.5 TRPBF 60025 12-Lead (4mm 4mm) Plastic DFN 40C to 85C LEAD BASED FINISH TAPE AND REEL PART MARKING PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6600CS8-2.5 LT6600CS8-2.5 TR 660025 8-Lead Plastic SO 0C to 70C LT6600IS8-2.5 LT6600IS8-2.5 TR 600I25 8-Lead Plastic SO 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 for the DFN Package. Consult LTC Marketing for information on nonstandard lead based nish parts. For more information on lead free part marking, go to: