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LTC6409 Datasheet(PDF) 1 Page - Linear Technology |
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LTC6409 Datasheet(HTML) 1 Page - Linear Technology |
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1 / 32 page  LTC6417 1 6417f The LTC®6417 is a differential unity gain buffer that can drive a 50Ω load with extremely low noise and excellent linearity. It is well suited for driving high speed 14- and 16-bit pipeline ADCs with input signals from DC to beyond 600MHz. Differential input impedance is 18.5kΩ, allowing 1:4 and 1:8 transformers to be used at the input providing additional system gain in 50Ω systems. With no external biasing or gain setting components and a flow-through pinout, the LTC6417 is very easy to use. It can be DC-coupled and has a common mode output offset of –60mV. The LTC6417 input pins are internally biased to provide an output common mode voltage that is set by the voltage on the VCM pin for AC-coupled applications. Supplycurrentistypically123mAandtheLTC6417operates on supply voltages ranging from 4.75V to 5.25V. Power consumption can be reduced to 74mA via the PWRADJ pin. The LTC6417 also has a hardware shutdown feature which reduces current consumption to 24mA. TheLTC6417featuresfast,adjustableoutputvoltageclamp- ing to help protect subsequent circuitry. The CLHI pin sets the maximum swing, while a symmetric minimum swing is set up internally. LTC6417 VOR pin will signal overrange when the clamps limit output voltage. The LTC6417 is packaged in a 20-lead 3mm × 4mm QFN package.Pinoutisoptimizedforplacementdirectlyadjacent to Linear Technology’s high speed 14- and 16-bit ADCs. Typical applicaTion DescripTion 1.6GHz Low Noise High Linearity Differential Buffer/16-Bit ADC Driver with Fast Clamp LTC6417 Driving an LTC2209 16-Bit ADC at 140MHz IF FeaTures applicaTions n 1.6GHz –3dB Small Signal Bandwidth n Low Distortion Driving 50Ω Load, 2.4VP-P Out –100dBc/–69dBc HD2/HD3 at 140MHz –80dBc IM3 and 46dBm OIP3 at 140MHz –100dBc/–66dBc HD2/HD3 at 380MHz –68dBc IM3 and 39dBm OIP3 at 380MHz n 1.5nV/√Hz Output Noise n 4.3pA/√Hz Input Current Noise n Programmable High Speed, Fast Recovery Output Clamping n 4.28VP-P Maximum Output Swing on a 50Ω Differential Load n DC-Coupled Signal Path n Operates on Single 4.75V to 5.25V Supply n Power: 615mW on 5V, Can Be Reduced to 370mW, Shutdown Mode 120mW n 3mm × 4mm 20-Lead QFN Package n Differential ADC Driver n CCD Buffer n Cable Driver n 50Ω Buffer LTC6417 Driving LTC2209 16-Bit ADC 32K Point FFT, fIN = 140MHz, –1dBFS, PGA = 0 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. FREQUENCY (MHz) 6417 TA01b 0 80 40 30 20 70 60 50 10 0 –20 –30 –10 –50 –60 –40 –70 –80 –100 –110 –90 –120 HD2 = –88dBc HD3 = –94dBc SFDR = 88dBc SNR = 75.4dB SEE FIGURE 1/TABLE 1 1:4 BALUN fS = 153.6Msps DEMO BOARD DC1685A • • PWRADJ GND SHDN CLHI VOR 6417 TA01a OUT+ OUT – 0.1µF 5V 2.2µF 3.3V VCM 2.2µF 8 1,6, 11,16 3,7,10, 17, 20,21 5 12 15 14 2 9 19 18 10 10 R42 300 C45 18pF E3 75nH R43 300 1k R53 120Ω AIN+ AIN– PGA = 0 LTC2209 IN+ V+ IN– LTC6417 680pF CLOCK (153.6MHz) 16 VCM C40 12pF C41 12pF E5 51nH C10 12pF C46 18pF E3 75nH R36 60.4 C43 27pF E1 51nH R12 60.4 C44 27pF E2 51nH 100 100 0.01µF 0.01µF T1 WBC4-14LB 4 6 3 2 1 50 +– |
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