ADC for communications receivers and instrumentation

The LTC2107’s unique 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 randomiser 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 100Ms/s, or double data rate (DDR) LVDS to minimise 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 2.4V_P-P or 1.6V_P-P. This gives the user the flexibility to trade off between noise and distortion. The best distortion performance is achieved in the 1.6V_P-P range while the 2.4V_P-P range results in the best noise performance. Exceptional aperture jitter of only 45fsRMS enables direct sampling of frequencies up to 500MHz with excellent SNR performance.

The LTC2107 delivers an extensive feature set in a 7x7mm QFN package, and dissipates 1.3W without the need for heat sinking. Designed for ease of use, the ADC requires only a single 2.5V analog supply for operation and comes with a clock duty cycle stabiliser 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 800MHz.

The LTC2107 is available today in both commercial and industrial temperature grades, and is competitively priced starting at $99.00 (USD) each in 1,000 unit quantities. Demo boards and samples are available via the Linear Technology website.