ADI ADA4950-1YCPZ-R7

The ADA4950-1/ADA4950-2 are gain-selectable versions of the ADA4932-1/ADA4932-2 with on-chip feedback and gain resistors. They are ideal choices for driving high performance ADCs as singleended-to-differential or differential-to-differential amplifiers. The output common-mode voltage is user adjustable by means of an internal common-mode feedback loop, allowing the ADA4950-1/ ADA4950-2 output to match the input of the ADC. The internal feedback loop also provides exceptional output balance as well as suppression of even-order harmonic distortion products. Differential gain configurations of 1, 2, and 3 are easily realized with internal feedback networks that are connected externally to set the closed-loop gain of the amplifier. The ADA4950-1/ADA4950-2 are fabricated using the proprietary silicon-germanium (SiGe) complementary bipolar process, enabling them to achieve low levels of distortion and noise at low power consumption. The low offset and excellent dynamic performance of the ADA4950-x make it well suited for a wide variety of data acquisition and signal processing applications. The devices are available in a Pb-free, 3 mm×3 mm, 16-lead LFCSP (ADA4950-1, single) or a Pb-free, 4 mm×4 mm, 24-lead LFCSP (ADA4950-2, dual). The pinout has been optimized to facilitate PCB layout and minimize distortion. The ADA4950-1/ ADA4950-2 are specified to operate over the -40°C to +105°C temperature range; both operate on supplies from +3 V to ±5 V.

• High performance at low power
• High speed −3 dB bandwidth of 750 MHz, G = 1
• 0.1 dB flatness to 210 MHz, Vdm = 2 Vp-p, RL,dm = 200 Ω
• Slew rate: 2900 V/µs, 25% to 75%
• Fast 0.7% settling time of 9 ns
• Low power: 9.5 mA per amplifier
• Low harmonic distortion
• 108 dB SFDR @ 10 MHz
• 98 dB SFDR @ 20 MHz
• Low output voltage noise: 9.2 nV/√Hz, G = 1, RTO
• ±0.2 mV typical input offset voltage
• Selectable differential gains of 1, 2, and 3
• Differential-to-differential or single-ended-to-differential operation
• Adjustable output common-mode voltage
• Input common-mode range shifted down by 1 VBE
• Wide supply range: +3 V to ±5 V
• Available in 16-lead and 24-lead LFCSP packages

• ADC drivers
• Single-ended-to-differential converters
• IF and baseband gain blocks
• Differential buffers
• Line drivers