0 Replies Latest reply on Jul 11, 2011 7:52 AM by GardenState

    Direct RF-Sampling ADCs Reduce Board Size, Component Count for 3G/4G Basestations, Military and SDR Apps

    GardenState

      National Semiconductor today introduced a family of analog-to-digital converters (ADCs) that are said to be the industry’s first to directly sample RF signals beyond 2.7 GHz, with third-order intermodulation distortion (IMD3) up to -71 dBc and sampling at up to 3.6 Giga-samples per second (GSPS).

       

      The ADC12Dxx00RF family includes five 12-bit ADCs that enable system designers to eliminate multiple intermediate frequency (IF) down-conversion stages including amplifiers, mixers and filters. A single ADC12Dxx00RF replaces radio signal path subsystems, reducing bill of materials (BOM) cost, board size and weight in 3G/4G wireless basestations as well as microwave backhaul, military and wideband software-defined radio (SDR) applications.

       

      The footprint-compatible ADC12Dxx00RF ADCs join National’s GSPS ADC family, allowing an easy upgrade path from 500 Mega-samples per second (MSPS) to 3.6 GSPS:

       

      • The ADC12D1800RF provides interleaved single-channel sampling rates up to 3.6 GSPS, or dual-channel rates up to 1.8 GSPS, with IMD3 of -64 dBc at 2.7 GHz.

      • The ADC12D1600RF provides interleaved single-channel sampling rates up to 3.2 GSPS, or dual-channel rates up to 1.6 GSPS, with IMD3 of -70 dBc at 2.7 GHz.

      • The ADC12D1000RF provides interleaved single-channel sampling rates up to 2.0 GSPS, or dual-channel rates up to 1.0 GSPS, with IMD3 of -69 dBc at 2.7 GHz.

      • The ADC12D800RF provides interleaved single-channel sampling rates up to 1.6 GSPS, or dual-channel rates up to 800 MSPS, with IMD3 of -71 dBc at 2.7 GHz.

      • The ADC12D500RF provides interleaved single-channel sampling rates up to 1.0 GSPS, or dual-channel rates up to 500 MSPS, with IMD3 of -69 dBc at 2.7 GHz.