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Broadband Modem Mixed-Signal Front End AD9868
FEATURES
Low cost 3.3 V CMOS MxFE for broadband modems 10-bit DAC converter 2×/4× interpolation filter 200 MSPS DAC update rate Integrated 17 dBm line driver with 19.5 dB gain control 10-bit, 80 MSPS, ADC converter −12 dB to +48 dB low noise RxPGA (<3 nV/√Hz) Third-order, programmable low-pass filter Flexible digital data path interface Half- and full-duplex operation Pin compatible with the AD9865 Various power-down/reduction modes Internal clock multiplier (PLL) 2 auxiliary programmable clock outputs Available in a 64-lead LFCSP_VQ
FUNCTIONAL BLOCK DIAGRAM
IOUTP+ IOUTP–
AD9868
PWRDWN MODE TXEN/TXSYNC TXCLK/TXQUIET ADIO[9:4]/ Tx[5:0] 10 2-4X TxDAC
0 TO –7.5dB
IAMP
0 TO –12dB
IOUTN+ IOUTN–
CLK SYNC.
AD9868 Datasheet
