Data Sheet
Broadband Modem Mixed-Signal Front End AD9865
FEATURES
Low cost 3.3 V CMOS MxFETM for broadband modems 10-b...
Data Sheet
Broadband Modem Mixed-Signal Front End AD9865
FEATURES
Low cost 3.3 V
CMOS MxFETM for broadband modems 10-bit D/A converter
2×/4× interpolation filter 200 MSPS DAC update rate Integrated 23 dBm line driver with 19.5 dB gain control 10-bit, 80 MSPS A/D converter −12 dB to +48 dB low noise RxPGA (< 3.0 nV/rtHz) Third order, programmable low-pass filter Flexible digital data path interface Half- and full-duplex operation Backward-compatible with AD9975 and AD9875 Various power-down/reduction modes Internal clock multiplier (PLL) 2 auxiliary programmable clock outputs Available in 64-lead chip scale package or bare die
APPLICATIONS
Powerline networking VDSL and HPNA
FUNCTIONAL BLOCK DIAGRAM
IOUT_P+ IOUT_P–
PWR DWN MODE
TXEN/SYNC TXCLK
ADIO[9:4]/ Tx[5:0]
ADIO[3:0]/ Rx[5:0]
RXE/SYNC RXCLK
AGC[5:0]
SPI
AD9865
10
2-4X
TxDAC
IAMP
0 TO –7.5dB
0 TO –12dB
CLK SYN.
2M CLK MULTIPLIER
10 ADC
80MSPS
2-POLE LPF
1-POLE LPF
6
4 REGISTER CONTROL
0 TO 6dB – 6 TO 18d...
