16-bit 210-MS/s ADC offers 80-dB SNR for instrumentation

April 29, 2014. Linear Technology Corp. has announced the LTC2107, a 16-bit 210-MS/s high-performance high-speed analog-to-digital converter (ADC) for high-end communications receivers and instrumentation applications. The LTC2107 achieves 80-dB SNR performance and 98-dB spurious-free dynamic range (SFDR) at baseband. Aperture jitter of only 45 fs RMS enables direct sampling of frequencies up to 500 MHz.

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 100 dB FS 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 100 MS/s, or double data rate (DDR) LVDS to minimize routing of lines to the FPGA.

The LTC2107 also features a programmable gain amplifier (PGA) front end that sets the ADC input range to either 2.4 VP-P or 1.6 VP-P. This gives the user the flexibility to trade off between noise and distortion. The best distortion performance is achieved in the 1.6-VP-P range while the 2.4-VP-P range results in the best noise performance.

The LTC2107 delivers an extensive feature set in a 7-mm x 7-mm QFN package, and dissipates 1.3 W without the need for heat sinking. Designed for ease of use, the LTC2107 requires only a single 2.5-V analog 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 analog input bandwidth of 800 MHz.

The LTC2107 is available today in both commercial and industrial temperature grades, and is priced starting at $99.00 each in 1,000-piece quantities. Demo boards and samples are available.


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