LT6604-5 Dual Very Low Noise, Differential Amplifi er and 5MHz Lowpass Filter FEATURESDESCRIPTION n Dual Differential Amplifi er with 5MHz Lowpass Filters The LT®6604-5 consists of two matched, fully differential 4th Order Filters amplifi ers, each with a 4th order, 5MHz lowpass fi lter. The Approximates Chebyshev Response fi xed frequency lowpass fi lter approximates a Chebyshev Guaranteed Phase and Gain Matching response. By integrating a fi lter and a differential ampli- Resistor-Programmable Differential Gain fi er, distortion and noise are made exceptionally low. At n >82dB Signal-to-Noise (3V Supply, 2VP-P Output) unity gain, the measured in-band signal-to-noise ratio is n Low Distortion (1MHz, 2VP-P Output, 800Ω Load) an impressive 82dB. At higher gains, the input referred HD2: 93dBc noise decreases, allowing the part to process smaller HD3: 96dBc input differential signals without signifi cantly degrading n Specifi ed for Operation with 3V, 5V and ±5V Supplies the signal-to-noise ratio. n Fully Differential Inputs and Outputs Gain and phase are well matched between the two chan- n Adjustable Output Common Mode Voltage nels. Gain for each channel is independently programmed n Small 4mm × 7mm × 0.75mm QFN Package using two external resistors. The LT6604-5 enables level shifting by providing an adjustable output common mode APPLICATIONS voltage, making it ideal for directly interfacing to ADCs. The LT6604-5 is fully specifi ed for 3V operation. The dif- n Dual Differential ADC Driver and Filter ferential design enables outstanding performance at a n Single-Ended to Differential Converter 2VP-P signal level for a single 3V supply. n Matched, Dual, Differential Gain or Filter Stage n See the back page of this datasheet for a complete list of Common Mode Translation of Differential Signals n related single and dual differential amplifi ers with integrated High Speed ADC Antialiasing and DAC Smoothing in 2.5MHz to 20MHz lowpass fi lters. Wireless Infrastructure or Networking Applications n L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other High Speed Test and Measurement Equipment trademarks are the property of their respective owners. n Medical Imaging TYPICAL APPLICATION 3V Channel to Channel Gain Matching 25 LT6604-5 LTC22xx DUAL ADC 50 TYPICAL UNITS V+A 3V T 806Ω A = 25°C +INA 50Ω GAIN = 1 – + –OUTA 20 VMIDA – + fIN = 5MHz V 18pF AIN DOUT OCMA 50Ω 0.01μF –INA + +OUTA – 15 + – 806Ω V+ V B + 3V 806Ω 10 +INB – + –OUTB 50Ω NUMBER OF UNITS VMIDB – + VOCMB 18pF AIN DOUT 5 0.01μF +OUTB 50Ω –INB + – + – 806Ω V– 0 66045 TA01 –0.20 –0.10 0 0.10 0.20 GAIN MATCH (dB) 66045 TA01b 66045fa 1
