DATASHEET
ISL1561 FN7941
Rev 1.00
February 26, 2013 Fixed Gain Dual Port Class-G Differential xDSL Line Driver
The ISL1561 is a fixed gain dual port class-G differential
amplifier designed for driving full rate ADSL2+ and VDSL2
signals at very low power dissipation. The driver runs on a
single +14V power supply and internally generates higher
supply voltages when needed to enable power efficient
operation for high peak-to-average ratio (PAR) ADSL2+ and
VDSL2 signals. Features Internal fixed gain of 11.6V/V to transformer (see Figure 3) 360mA output drive capability 41.8VP-P differential output drive into 100пЃ—пЂ in class G mode VDSL2 8b profile MTPR of -64dBc In ADSL2+ mode of operation with full 19.8dBm transmit
signal power across 100пЃ— line load, each port consumes only
520mW of power, while with 19.5dBm VDSL2 8b profile a port
consumes 610mW of power. In VDSL2 17a mode of operation
with 14.5dBm transmit power, a port will consume 411mW of
power. These typical power consumption figures account for
receiver hybrid loading effects and transformer losses. VDSL2 17a profile MTPR of -60dBc The ISL1561 provides two ports of wideband, current feedback
amplifiers optimized for low power consumption in xDSL
systems. The drivers achieve an average upstream missing
band power ratio (MBPR) distortion of better than -64dBc
under 19.8dBm transmit signal power into 100пЃ— load. A three
pin serial interface is used to program an 8-bit internal register
to set each port’s supply current with 0.5mA step size. This …