Datasheet LTC6400-26 (Analog Devices)
| Fabricante | Analog Devices |
| Descripción | 1.9GHz Low Noise, Low Distortion Differential ADC Driver for DC-300MHz |
| Páginas / Página | 16 / 1 — FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. Single-Ended to … |
| Formato / tamaño de archivo | PDF / 231 Kb |
| Idioma del documento | Inglés |
FEATURES. DESCRIPTION. APPLICATIONS. TYPICAL APPLICATION. Single-Ended to Differential ADC Driver at 140MHz IF
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LTC6400-26 1.9GHz Low Noise, Low Distortion Differential ADC Driver for DC-300MHz
FEATURES DESCRIPTION
■ 1.9GHz –3dB Bandwidth The LTC®6400-26 is a high-speed differential amplifi er ■ Fixed Gain of 20V/V (26dB) targeted at processing signals from DC to 300MHz. The ■ –94dBc IMD3 at 70MHz (Equivalent OIP3 = 51dBm) part has been specifi cally designed to drive 12-, 14- and ■ –71dBc IMD3 at 300MHz (Equivalent OIP3 = 39.5dBm) 16-bit ADCs with low noise and low distortion, but can also ■ 1nV/√Hz Internal Op Amp Noise be used as a general-purpose broadband gain block. ■ 1.5nV/√Hz Total Input Referred Noise The LTC6400-26 is easy to use, with minimal support ■ 6.8dB Noise Figure circuitry required. The output common mode voltage is ■ Differential Inputs and Outputs set using an external pin, independent of the inputs, which ■ 50Ω Input Impedance eliminates the need of transformers or AC-coupling ca- ■ 2.85V to 3.5V Supply Voltage pacitors in many applications. The gain is internally fi xed ■ 85mA Supply Current (255mW) at 26dB (20V/V). ■ 1V to 1.6V Output Common Mode, Adjustable ■ DC- or AC-Coupled Operation The LTC6400-26 saves space and power compared to ■ Max Differential Output Swing 4.7V alternative solutions using IF gain blocks and transform- P-P ■ Small 16-Lead 3mm × 3mm × 0.75mm QFN Package ers. The LTC6400-26 is packaged in a compact 16-lead 3mm × 3mm QFN package and operates over the –40°C
APPLICATIONS
to 85°C temperature range. ■ Differential ADC Driver L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Differential Driver/Receiver ■ Single Ended to Differential Conversion ■ IF Sampling Receivers ■ SAW Filter Interfacing
TYPICAL APPLICATION Single-Ended to Differential ADC Driver at 140MHz IF Equivalent OIP3 vs Frequency
3.3V 3.3V 60 DIFFERENTIAL INPUT (NOTE 7) 50 0.1μF 1000pF 33pF 40 V+ 0.1μF 15Ω 10Ω VDD 30 V AIN+ IN +IN +OUT 150W LTC6400-26 24nH 33pF LTC2208 OUTPUT IP3 (dBm) 20 0.1μF 15Ω 10Ω –IN –OUT V AIN– VCM 10 OCM NO R 37.4Ω 33pF L COILCRAFT V– LTC2208 RL = 200Ω 0603CS 130Msps 0 16-BIT ADC 0 50 100 150 200 250 300 1.25V 640026 TA01a FREQUENCY (MHz) 100Ω 0.1μF 640026 TA01b 640026fa 1
FEATURES DESCRIPTION
■ 1.9GHz –3dB Bandwidth The LTC®6400-26 is a high-speed differential amplifi er ■ Fixed Gain of 20V/V (26dB) targeted at processing signals from DC to 300MHz. The ■ –94dBc IMD3 at 70MHz (Equivalent OIP3 = 51dBm) part has been specifi cally designed to drive 12-, 14- and ■ –71dBc IMD3 at 300MHz (Equivalent OIP3 = 39.5dBm) 16-bit ADCs with low noise and low distortion, but can also ■ 1nV/√Hz Internal Op Amp Noise be used as a general-purpose broadband gain block. ■ 1.5nV/√Hz Total Input Referred Noise The LTC6400-26 is easy to use, with minimal support ■ 6.8dB Noise Figure circuitry required. The output common mode voltage is ■ Differential Inputs and Outputs set using an external pin, independent of the inputs, which ■ 50Ω Input Impedance eliminates the need of transformers or AC-coupling ca- ■ 2.85V to 3.5V Supply Voltage pacitors in many applications. The gain is internally fi xed ■ 85mA Supply Current (255mW) at 26dB (20V/V). ■ 1V to 1.6V Output Common Mode, Adjustable ■ DC- or AC-Coupled Operation The LTC6400-26 saves space and power compared to ■ Max Differential Output Swing 4.7V alternative solutions using IF gain blocks and transform- P-P ■ Small 16-Lead 3mm × 3mm × 0.75mm QFN Package ers. The LTC6400-26 is packaged in a compact 16-lead 3mm × 3mm QFN package and operates over the –40°C
APPLICATIONS
to 85°C temperature range. ■ Differential ADC Driver L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. ■ Differential Driver/Receiver ■ Single Ended to Differential Conversion ■ IF Sampling Receivers ■ SAW Filter Interfacing
TYPICAL APPLICATION Single-Ended to Differential ADC Driver at 140MHz IF Equivalent OIP3 vs Frequency
3.3V 3.3V 60 DIFFERENTIAL INPUT (NOTE 7) 50 0.1μF 1000pF 33pF 40 V+ 0.1μF 15Ω 10Ω VDD 30 V AIN+ IN +IN +OUT 150W LTC6400-26 24nH 33pF LTC2208 OUTPUT IP3 (dBm) 20 0.1μF 15Ω 10Ω –IN –OUT V AIN– VCM 10 OCM NO R 37.4Ω 33pF L COILCRAFT V– LTC2208 RL = 200Ω 0603CS 130Msps 0 16-BIT ADC 0 50 100 150 200 250 300 1.25V 640026 TA01a FREQUENCY (MHz) 100Ω 0.1μF 640026 TA01b 640026fa 1