LT6604-15 Dual Very Low Noise, Differential Ampli er and 15MHz Lowpass Filter FEATURES DESCRIPTION n Dual Differential Ampli er with 15MHz Lowpass The LT 6604-15 consists of two matched, fully differential Filters ampli ers, each with a 4th order, 15MHz lowpass lter. The 4th Order Filters xed frequency lowpass lter approximates a Chebyshev Approximates Chebyshev Response response. By integrating a lter and a differential ampli- Guaranteed Phase and Gain Matching er, distortion and noise are made exceptionally low. At Resistor-Programmable Differential Gain unity gain, the measured in band signal-to-noise ratio is n 76dB Signal-to-Noise (3V Supply, 2V Output) an impressive 76dB. At higher gains, the input referred P-P n Low Distortion, 2V , 800 Load, V = 3V noise decreases, allowing the part to process smaller P-P S 1MHz: 86dBc 2nd, 90dBc 3rd input differential signals without signi cantly degrading 10MHz: 63dBc 2nd, 69dBc 3rd the signal-to-noise ratio. n Speci ed for Operation with 3V, 5V and 5V Supplies Gain and phase are highly matched between the two chan- n Fully Differential Inputs and Outputs nels. Gain for each channel is independently programmed n Adjustable Output Common Mode Voltage using two external resistors. The LT6604-15 enables level n Small 4mm 7mm 0.75mm QFN Package shifting by providing an adjustable output common mode voltage, making it ideal for directly interfacing to ADCs. APPLICATIONS The LT6604-15 is fully speci ed for 3V operation. The differential design enables outstanding performance at n Dual Differential ADC Driver Plus Filter a 2V signal level for a single 3V supply. See the back n P-P Single-Ended to Differential Converter page of this datasheet for a complete list of related single n Matched, Dual, Differential Filter Stage and dual differential ampli ers with integrated 2.5MHz to n Common Mode Translation of Differential Signals 20MHz lowpass lters. n High Speed ADC Antialiasing and DAC Smoothing in Wireless Infrastructure or Networking Applications L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. n High Speed Test and Measurement Equipment n Medical Imaging TYPICAL APPLICATION Channel to Channel Gain Matching 3V 16 50 TYPICAL UNITS LT6604-15 + LTC22xx DUAL ADC V A 3V T = 25C A 14 536 +INA GAIN = 1 50 0.01F + + OUTA f = 15MHz IN V 12 MIDA 18pF V AIN DOUT OCMA 50 10 +OUTA 536 + INA 8 ++ VV BB 3V 536 6 +INB 50 0.01F + + OUTB V MIDB 4 V 18pF AIN DOUT OCMB 50 +OUTB 2 536 + INB 0 V 0.250.20.15 0.10.05 0 0.05 0.1 0.15 0.2 0.25 660415 TA01 GAIN MATCH (dB) 660415 TA01b 660415fb 1 + +LT6604-15 ABSOLUTE MAXIMUM RATINGS PIN CONFIGURATION (Note 1) TOP VIEW Total Supply Voltage .................................................11V Operating Temperature Range (Note 6).... 40C to 85C Speci ed Temperature Range (Note 7) .... 40C to 85C NC 1 30 NC Junction Temperature ........................................... 150C +INA 2 29 OUTA Storage Temperature Range ................... 65C to 150C NC 3 28 NC INA 4 27 +OUTA Input Current NC 5 26 NC +IN, IN, V , V (Note 8) .........................10mA OCM MID + V 6 25 V A OCMA Lead Temperature (Soldering, 10 sec) .................. 300C V 7 35 24 V V 8 23 NC MIDB NC 9 22 NC +INB 10 21 OUTB NC 11 20 NC INB 12 19 +OUTB NC 13 18 NC UFF PACKAGE 34-LEAD (4mm 7mm) PLASTIC QFN T = 150C, = 34C/W, = 2.7C/W JMAX JA JC EXPOSED PAD (PIN 35) IS V , MUST BE SOLDERED TO PCB ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT6604CUFF-15 PBF LT6604CUFF-15 TRPBF 60415 34-Lead (4mm 7mm) Plastic QFN 0C to 70C LT6604IUFF-15 PBF LT6604IUFF-15 TRPBF 60415 34-Lead (4mm 7mm) 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: