Datasheet LTC6401-20 (Analog Devices)
| Manufacturer | Analog Devices |
| Description | 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF |
| Pages / Page | 16 / 1 — FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. Single-Ended to … |
| File Format / Size | PDF / 230 Kb |
| Document Language | English |
FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. Single-Ended to Differential ADC Driver
Model Line for this Datasheet
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LTC6401-20 1.3GHz Low Noise, Low Distortion Differential ADC Driver for 140MHz IF
FEATURES DESCRIPTION
■ 1.3GHz –3dB Bandwidth The LTC®6401-20 is a high-speed differential amplifi er ■ Fixed Gain of 10V/V (20dB) targeted at processing signals from DC to 140MHz. The ■ –93dBc IMD3 at 70MHz (Equivalent OIP3 = 50.5dBm) part has been specifi cally designed to drive 12-, 14- and ■ –74dBc IMD3 at 140MHz (Equivalent OIP3 = 41dBm) 16-bit ADCs with low noise and low distortion, but can also ■ 1nV/√⎯H⎯z Internal Op Amp Noise be used as a general-purpose broadband gain block. ■ 2.1nV/√⎯H⎯z Total Input Noise The LTC6401-20 is easy to use, with minimal support ■ 6.2dB Noise Figure circuitry required. The output common mode voltage is ■ Differential Inputs and Outputs set using an external pin, independent of the inputs, which ■ 200Ω Input Impedance eliminates the need for transformers or AC-coupling ca- ■ 2.85V to 3.5V Supply Voltage pacitors in many applications. The gain is internally fi xed ■ 50mA Supply Current (150mW) at 20dB (10V/V). ■ 1V to 1.6V Output Common Mode Voltage, Adjustable The LTC6401-20 saves space and power compared to ■ DC- or AC-Coupled Operation alternative solutions using IF gain blocks and transform- ■ Max Differential Output Swing 4.4V ers. The LTC6401-20 is packaged in a compact 16-lead P-P ■ Small 16-Lead 3mm × 3mm × 0.75mm QFN Package 3mm × 3mm QFN package and operates over the –40°C to 85°C temperature range.
APPLICATIONS
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Differential ADC Driver ■ Differential Driver/Receiver ■ Single Ended to Differential Conversion ■ IF Sampling Receivers ■ SAW Filter Interfacing
TYPICAL APPLICATION Single-Ended to Differential ADC Driver Equivalent Output IP3 vs Frequency
70 3.3V 1.25V (NOTE 7) 0.1μF + 1000pF 0.1μF 60 3.3V V+ 50 0.1μF VOCM 10Ω V 40 INPUT CM VDD +IN +OUT AIN+ +OUTF 66.5Ω 30 LTC6401-20 LTC2208 0.1μF –OUTF OUTPUT IP3 (dBm) –OUT AIN– 20 –IN V– 10Ω 29Ω ENABLE LTC2208 130Msps 10 20dB GAIN 16-Bit ADC 0 640120 TA01a 0 50 100 150 200 FREQUENCY (MHz) 640120 TA01b 640120f 1
FEATURES DESCRIPTION
■ 1.3GHz –3dB Bandwidth The LTC®6401-20 is a high-speed differential amplifi er ■ Fixed Gain of 10V/V (20dB) targeted at processing signals from DC to 140MHz. The ■ –93dBc IMD3 at 70MHz (Equivalent OIP3 = 50.5dBm) part has been specifi cally designed to drive 12-, 14- and ■ –74dBc IMD3 at 140MHz (Equivalent OIP3 = 41dBm) 16-bit ADCs with low noise and low distortion, but can also ■ 1nV/√⎯H⎯z Internal Op Amp Noise be used as a general-purpose broadband gain block. ■ 2.1nV/√⎯H⎯z Total Input Noise The LTC6401-20 is easy to use, with minimal support ■ 6.2dB Noise Figure circuitry required. The output common mode voltage is ■ Differential Inputs and Outputs set using an external pin, independent of the inputs, which ■ 200Ω Input Impedance eliminates the need for transformers or AC-coupling ca- ■ 2.85V to 3.5V Supply Voltage pacitors in many applications. The gain is internally fi xed ■ 50mA Supply Current (150mW) at 20dB (10V/V). ■ 1V to 1.6V Output Common Mode Voltage, Adjustable The LTC6401-20 saves space and power compared to ■ DC- or AC-Coupled Operation alternative solutions using IF gain blocks and transform- ■ Max Differential Output Swing 4.4V ers. The LTC6401-20 is packaged in a compact 16-lead P-P ■ Small 16-Lead 3mm × 3mm × 0.75mm QFN Package 3mm × 3mm QFN package and operates over the –40°C to 85°C temperature range.
APPLICATIONS
, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Differential ADC Driver ■ Differential Driver/Receiver ■ Single Ended to Differential Conversion ■ IF Sampling Receivers ■ SAW Filter Interfacing
TYPICAL APPLICATION Single-Ended to Differential ADC Driver Equivalent Output IP3 vs Frequency
70 3.3V 1.25V (NOTE 7) 0.1μF + 1000pF 0.1μF 60 3.3V V+ 50 0.1μF VOCM 10Ω V 40 INPUT CM VDD +IN +OUT AIN+ +OUTF 66.5Ω 30 LTC6401-20 LTC2208 0.1μF –OUTF OUTPUT IP3 (dBm) –OUT AIN– 20 –IN V– 10Ω 29Ω ENABLE LTC2208 130Msps 10 20dB GAIN 16-Bit ADC 0 640120 TA01a 0 50 100 150 200 FREQUENCY (MHz) 640120 TA01b 640120f 1
