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Dual ADC drivers deliver guaranteed matching, low noise

Milpitas, Calif.—Linear Technology has announced the LTC6420-20 and LTC6421-20, high-speed dual differential ADC drivers with guaranteed matched gain of ±0.25dB and matched phase of ±0.1° (typ).

The LTC6420-20 reduces errors in multi-channel 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 amplifiers achieve their distortion and noise specs on a single 3V supply and have rail-to-rail output swing. This allows the dual ADCs and amplifiers to share the same voltage supply in many applications. 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 suitable 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.
Availability: Now.
Datasheets: LTC6420-20 and LTC6421-20.

Linear Technology, www.linear.com

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