VDSP-21XX-PCFLT-5

Broadband Modem Mixed-Signal Front End AD9868 Broadband wireline networking AD9868 2-4X PWRDWN MODE TXEN/TXSYNC TXCLK/TXQUIET IAMP TxDAC 10 0 TO –7.5dB IOUTN– 0 TO –12dB CLKOUT1 CLKOUT2 CLK SYNC. ADIO[9:4]/ Tx[5:0] IOUTN+ 2M CLK MULTIPLIER OSCIN XTAL ADIO[3:0]/ Rx[5:0] 10 RXEN/RXSYNC RXCLK AGC[5:0] PORT SPI PORT ADC 80MSPS 2-POLE LPF RX+ 1-POLE LPF RX– 6 0 TO 6dB 4 REGISTER Δ = 1dB CONTROL –6 TO +18dB –6 TO +24dB Δ = 6dB Δ = 6dB 06733-001 APPLICATIONS FUNCTIONAL BLOCK DIAGRAM IOUTP– 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 (