ADA4939-1

Ultralow Distortion Differential ADC Driver ADA4939-1/ADA4939-2 FEATURES www.datasheet4u.com Extremely low harmonic distortion −102 dBc HD2 @ 10 MHz −83 dBc HD2 @ 70 MHz −77 dBc HD2 @ 100 MHz −101 dBc HD3 @ 10 MHz −97 dBc HD3 @ 70 MHz −91 dBc HD3 @ 100 MHz Low input voltage noise: 2.3 nV/√Hz High speed −3 dB bandwidth of 1.4 GHz, G = 2 Slew rate: 6800 V/μs, 25% to 75% Fast overdrive recovery of <1 ns ±0.5 mV typical offset voltage Externally adjustable gain Stable for differential gains ≥2 Differential-to-differential or single-ended-to-differential operation Adjustable output common-mode voltage Single-supply operation: 3.3 V to 5 V FUNCTIONAL BLOCK DIAGRAMS 16 –VS 15 –VS 13 –VS 12 PD 11 –OUT 10 +OUT 9 VOCM –FB 1 +IN 2 –IN 3 +FB 4 ADA4939-1 14 –VS +VS 7 +VS 8 +VS 5 Figure 1. ADA4939-1 +IN1 –FB1 –VS1 –VS1 PD1 –OUT1 –IN1 +FB1 +VS1 +VS1 –FB2 +IN2 1 2 3 4 5 6 24 23 22 21 20 19 +VS 6 ADA4939-2 18 17 16 15 14 13 +OUT1 VOCM1 –VS2 –VS2 PD2 –OUT2 –IN2 +FB2 +VS2 +VS2 VOCM2 +OUT2 7 8 9 10 11 12 07429-001 APPLICATIONS ADC drivers Single-ended-to-differential converters IF and baseband gain blocks Differential buffers Line drivers –60 –65 Figure 2. ADA4939-2 VOUT, dm = 2V p-p HD2 HD3 HARMONIC DISTORTION (dBc) –70 –75 –80 –85 –90 –95 –100 –105 1 GENERAL DESCRIPTION The ADA4939 is a low noise, ultralow distortion, high speed differential amplifier. It is an ideal choice for driving high performance ADCs with resolutions up to 16 bits from dc to 100 MHz. The output com...