LT6604-2.5 Dual Very Low Noise, Differential Amplifi er and 2.5MHz Lowpass Filter FEATURESDESCRIPTION n Dual Differential Amplifi er with 2.5MHz Lowpass Filters The LT®6604-2.5 consists of two matched, fully differential 4th Order Filters amplifi ers, each with a 4th order, 2.5MHz 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 >86dB Signal-to-Noise (3V Supply, 1VRMS Output) unity gain, the measured in-band signal-to-noise ratio is n Low Distortion (1MHz, 1VRMS Output, 800Ω Load) an impressive 86dB. At higher gains, the input referred HD2: 92dBc noise decreases, allowing the part to process smaller HD3: 88dBc 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 LT6604-2.5 enables level shifting by providing an adjustable output common mode APPLICATIONS voltage, making it ideal for directly interfacing to ADCs. The LT6604-2.5 is fully specifi ed for 3V operation. The n Dual Differential ADC Driver and Filter differential design enables outstanding performance up n Single-Ended to Differential Converter to a 4VP-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.v n Medical Imaging TYPICAL APPLICATIONChannel to Channel Gain Matching 3V 18 50 TYPICAL UNITS LT6604-2.5 LTC22xx DUAL ADC V+A 3V 16 TA = 25°C 1580Ω GAIN = 1 +INA 50Ω + + –OUTA 14 fIN = 2.5MHz VMIDA – + 12 V 18pF AIN DOUT OCMA 50Ω 0.01μF –INA + +OUTA – 10 – – 1580Ω 8 V+ V B + 3V 1580Ω +INB 50Ω NUMBER OF UNITS 6 + + –OUTB VMIDB – + 4 VOCMB 18pF AIN DOUT 0.01μF +OUTB 50Ω 2 –INB + – – – 0 1580Ω V– –0.25 –0.15 –0.05 0 0.05 0.15 0.25 660425 TA01 GAIN MATCH (dB) 660425 TA01b 660425fa 1
