SBAS932 March 2024 DAC39RF10-SEP , DAC39RF10-SP , DAC39RFS10-SEP , DAC39RFS10-SP
PRODMIX
Dual edge sampling (DES) mode outputs unique samples on both the rising and falling edge of CLK, doubling the sample rate for the same clock frequency. An extra digital interpolate by 2 stage is included in the device to enable a double sample rate.
An non-50% CLK duty cycle results in an image of the signal at FCLK - FOUT. Compared to NRZ mode with the same clock frequency, DES mode provides significant reduction in the image amplitude, reducing filter requirements. There are three DES modes: DES1X, DES2XL and DES2XH. DES1X mode also allows 15.52 or 20.8GSPS of unique data in 12-bit and 8-bit single channel mode, supporting 7.68GHz or 10.4GHz of signal bandwidth. DES2XL uses an low pass 2x interpolation filter to increase from the single edge sample rate to dual edge sample rate, and supports output frequencies between 0 - 0.4*FCLK with up to 4.16GHz of signal BW). DES2XH uses a high pass interpolation filter, supporting output frequencies between 0.6 - 1.0*FCLK with the same signal BW as DES2XL.