DATASHEET ISL1539A FN6916 Rev 0.00 Dual Port VDSL2 Line Driver September 23, 2009 The ISL1539A provides 4 internal wideband op amps Features intended to be used as two pairs of differential line 360mA Output Drive Capability drivers. The ISL1539As high bandwidth, 240MHz, and ultra low distortion, -89dBc 1MHz, 2V , support P-P 41.8V Differential Output Drive into 100 P-P the demanding MTPR requirements of emerging VDSL2 -89dBc THD 1MHz 2V P-P line driver designs. Less demanding requirements can -65dBc MTPR (VDSL 8b Profile) be met at very low quiescent powers using the supply current adjustment features. High Slew Rate of 3000V/s Differential Bandwidth (240MHz A = 10) V-DIFF Each of the 4 internal op amps is a wideband current feedback amplifier offering very high slew rate intrinsic Supply Current Control Pins to that design using low quiescent current levels. Each Port Separation of the two pair of amplifiers (ports) can also be power - 78dB 500kHz optimized to the application using two external -70dB 1MHz quiescent control logic pins. Full power is nominally -60dB 4MHz 27.2mA/port with options of medium power cutback to 23mA/port, a low power condition at 13.5mA/port, and Pb-Free (RoHS Compliant) an off state at <0.5mA/port. Added quiescent power flexibility is provided through an external I pin. ADJ Applications*(see page 21) Grounding the pin gives the nominal currents listed 8MHz and 17MHz VDSL2 Profiles above while inserting a resistor from this pin to ground can be used to scale each of the settings downward. ADSL2+ High power push/pull line driver applications as Related Literature (see Device Info illustrated in the example below are best supported using a low headroom, high output current device. On page) 12V supplies, the ISL1539A offers a 1.1V headroom AN1325 Choosing and Using Bypass Capacitors with >360mA peak output current. Driving TB426 Characterization of the Output Protection differentially this gives >41.8V swing to as low as P-P Circuitry of the EL1528 DSL Driver for Lightning 58 differential load. High SFDR operation is also Surges supported for supplies as low as 7.5V. Intended to be used as differential pairs, this two port device includes TABLE 1. ALTERNATE SOLUTIONS special circuitry to minimize common mode loop NOMINAL V BANDWIDTH CC peaking while also reducing the common mode output PART (V) (MHz) APPLICATIONS noise spectrum. That circuitry links the two sides of ISL1557 6 200 VDSL each port, precluding their application as individual ISL1534 12 40 ADSL2+ amplifiers. ISL1536 12 50 ADSL2+ Typical Application 4MHz Harmonic Distortion +12V V = 12V S + AV = +10 Ro Rb ISL1539A R = 3.2k F - Rf R = 100 DIFF L 1:n 3.2k VI VO Rg711 LOAD SOURCE 3rd HD Rf 2nd HD 3.2k - THD ISL1539A Ro + AV-DIFF = VO/VI = 10V/V Rb -12V TYPICAL DIFFERENTIAL I/O LINE DRIVER (1 OF 2 PORTS) FN6916 Rev 0.00 Page 1 of 23 September 23, 2009ISL1539A Pin Configurations ISL1539A ISL1539A (24 LD HTSSOP) (24 LD QFN) TOP VIEW TOP VIEW VS- 1 24 VS+ + C0AB 2 23 VOUTA - C1AB 3 22 VINA- VINA+ 1 19 VINA- + VINA+ 4 21 VINB- - VINB+ 2 18 VINB- - VINB+ 5 20 VOUTB + GND 3 17 VOUTB - GND 6 19 NC + IADJ 4 16 NC/SHIELD IADJ 7 18 NC + NC 5 15 VOUTC - + VINC+ 8 17 VOUTC - VINC+ 6 14 VINC- - VIND+ 9 16 VINC- + VIND+ 7 13 VIND- C1CD 10 15 VIND- - C0CD 11 14 VOUTD + VS- 12 13 VS+ VS- 1 24 VS+ C0AB 2 23 VOUTA C1AB 3 22 VINA- VINA+ 1 19 VINA- VINA+ 4 21 VINB- VINB+ 2 18 VINB- VINB+ 5 20 VOUTB GND 3 17 VOUTB GND 6 19 NC THERMAL THERMAL IADJ 4 16 NC/SHIELD PAD PAD IADJ 7 18 NC NC 5 15 VOUTC VINC+ 8 17 VOUTC VINC+ 6 14 VINC- VIND+ 9 16 VINC- VIND+ 7 13 VIND- C1CD 10 15 VIND- C0CD 11 14 VOUTD VS- 12 13 VS+ THERMAL PAD CONNECTS TO GND OR -V THERMAL PAD CONNECTS TO GND OR -V S S Pin Descriptions ISL1539AIR ISL1539AIV (24 Ld QFN) (24 Ld HTSSOP) PIN NAME FUNCTION CIRCUIT 1 4 VINA+ Amplifier A non-inverting input (Refer to Circuit 1) 2 5 VINB+ Amplifier B non-inverting input (Refer to Circuit 1) 3 6 GND Ground connection 4 7 IADJ Supply current control pin for (Refer to Figure 46) both DSL Port 1 and 2 518, 19 NC Not connected 6 8 VINC+ Amplifier C non-inverting input (Refer to Circuit 1) 7 9 VIND+ Amplifier D non-inverting input (Refer to Circuit 1) 8 10 C1CD DSL Port 2 current control pin (Refer to Figure 46) 9 11 C0CD DSL Port 2 current control pin (Refer to Figure 46) 10, 22 1, 12 VS- Negative supply 11, 21 13, 24 VS+ Positive supply 12 14 VOUTD Amplifier D output (Refer to Circuit 2) FN6916 Rev 0.00 Page 2 of 23 September 23, 2009 C1CD 8 24 C1AB C1CD 8 24 C1AB C0CD 9 23 C0AB C0CD 9 23 C0AB VS- 10 22 VS- VS- 10 22 VS- VS+ 11 21 VS+ VS+ 11 21 VS+ VOUTD 12 20 VOUTA VOUTD 12 20 VOUTA