AD9867

Broadband Modem Mixed-Signal Front End AD9867 FEATURES Low cost, 3.3 V CMOS MxFE® for broadband modems 10-bit digital-to-analog converter (DAC) 2×/4× interpolation filter 250 MSPS DAC update rate 10-bit, 75 MSPS ADC Low noise RxPGA Dual channel muxed input 6 dB input overload attenuator −12 dB to +48 dB (without attenuator) Third-order programmable low-pass filter Flexible digital datapath interface Half-duplex and full-duplex operation Programmable delay Tx driver disable signal Various power-down/reduction modes Internal clock multiplier (PLL) 2 auxiliary programmable clock outputs 64-lead LFCSP FUNCTIONAL BLOCK DIAGRAM OSCIN XTAL CLKOUT1 CLKOUT2 AD9867 PWR_DWN TXEN/TXSYNC TXCLK/TXQUIET ADIO[9:5]/ Tx[4:0] 10 2×/4× TxDAC IOUT_P– 0 TO –7.5dB THIRD-ORDER LPF f–3dB = 33MHz 10 RX2+ ADC 80MSPS 2-POLE LPF 1-POLE LPF 2M CLK MULTIPLIER DCTCXO CLK SYN/DIST TX PWDN DELAY TX_DISABLE IOUT_P+ ADIO[4:0]/ Rx[4:0] RXCLK RXEN/RXSYNC AGC[4:0] SPORT RXSELECT ATTEN/RXQUIET 5 4 1 1 RX2– 0dB TO 6dB – 6dB TO +18dB –6dB TO +24dB Δ = 1dB Δ = 6dB Δ = 6dB REGISTER CONTROL RX1+ RX1– Figure 1. APPLICATIONS www.DataSheet4U.com Power-line networking GENERAL DESCRIPTION The AD9867 is a mixed-signal front-end (MxFE) IC for transceiver applications requiring Tx and Rx path functionality with data rates up to 75 MSPS. Its flexible digital interface, power-saving modes, and high Tx-to-Rx isolation make the part well suited for half-duplex and full-duplex applications. The digital interface is ext...