Linear Tech Launches 8/1.3GHz, Low Distortion, Dual ADC Drivers

Linear Technology has announced its LTC6420-20 and LTC6421-20, dual differential ADC drivers with guaranteed gain matching, and exceptional noise and distortion performance. With guaranteed matched gain of ±0.25dB and matched phase of ±0.1° (typ), the LTC6420-20 reduces errors in multichannel systems such as IQ demodulation or diversity receivers. Channel separation is 80dB at 100MHz. The LTC6420-20 provides a fixed gain of 20dB with -84dBc third-order intermodulation distortion at 100MHz input frequency. Input voltage noise is 2.2nV/√Hz, including internal gain-setting resistors. These drivers can drive an ADC directly without any external output impedance matching and can convert single-ended inputs into differential outputs. The LTC6420-20 is ideal for processing signals from DC to 300MHz. LTC6421-20 is a lower power (40mA) version of the LTC6420-20 and is optimized for lower input frequencies of DC to 140MHz. These parts are available in a tiny 3mm x 4mm 20 lead plastic QFN package and are fully specified over the commercial (0°C to 70°C) and industrial (-40°C to +85°C) temperature range. Pricing starts at $5.22 for the LTC6420-20 and $4.82 for the LTC6421-20 in 1,000 piece quantities.