New 16-bit, 210Msps ADC delivers 80dB SNR for comms and instrumentation systems

Linear Technology’s new  LTC2107 is a 16-bit 210Msps high performance high-speed analogue-to-digital converter (ADC) for high-end communications receivers and instrumentation applications. The LTC2107 has been designed to provide superior AC performance specifications, achieving 80dB SNR performance and an industry leading 98dB SFDR at baseband.

Exceptional aperture jitter of only 45fsRMS enables direct sampling of frequencies up to 500MHz.

The LTC2107’s features simplify receiver design and improve system performance. An optional internal transparent dither circuit improves the ADC’s SFDR response well beyond 100dBFS for low level input signals. The digital output randomizer and alternate bit polarity mode dramatically reduce unwanted tones caused by digital feedback. The flexible digital outputs can run as full-rate CMOS for sample rates below 100Msps, or double data rate (DDR) LVDS to minimize routing of lines to the FPGA.

The device also features a programmable gain amplifier (PGA) front end that sets the ADC input range to either 2.4VP-P or 1.6VP-P. This gives the user the flexibility to trade- off between noise and distortion. The best distortion performance is achieved in the 1.6VP-P range while the 2.4VP-P range results in the best noise performance.

The LTC2107 delivers an extensive feature set in a 7mm x 7mm QFN package, and dissipates 1.3W without the need for heat sinking. Designed for ease of use, the LTC2107 requires only a single 2.5V analogue supply for operation and comes with a clock duty cycle stabilizer for maintaining the ADC’s performance over varying duty cycles.

The LTC2107 can accept high frequency, wide dynamic range signals, offering a wide analogue input bandwidth of 800MHz.



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