ADC offers direct IF sampling up to 500 MHz

21 April 2004 Telecoms, Datacoms, Wireless, IoT

A new 80 Msps, 14-bit ADC from Linear Technology simplifies the design of basestations by eliminating the second intermediate frequency (IF) down-conversion stage. The LTC1750 device provides wide input bandwidth and superior dynamic performance for direct IF digitising, making it suitable for use in cellular basestations and broadband software radios. It undersamples up to 500 MHz input frequencies and delivers 84 dB spurious free dynamic range (SFDR) with 140 MHz inputs and 74 dB SFDR with 350 MHz inputs. The LTC1750 offers the flexibility to configure the input and the output specifically for the application. An on-chip programmable gain amplifier allows multiple input ranges. The larger input range offers low noise, and the smaller range lowers the gain requirements on the drive circuitry, making it easier to meet the IP3 requirements. The LTC1749 is a pin compatible 12-bit version of the 14-bit LTC1750.

Memec SA, 011 897 8600

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