LT1795 Dual 500mA/50MHz Current Feedback Line Driver Amplifier FEATURES DESCRIPTIO n 500mA Output Drive Current The LT 1795 is a dual current feedback amplifier with high n 50MHz Bandwidth, A = 2, R = 25 output current and excellent large signal characteristics. V L n 900V/s Slew Rate, A = 2, R = 25 The combination of high slew rate, 500mA output drive V L n Low Distortion: 75dBc at 1MHz and up to 15V operation enables the device to deliver n High Input Impedance, 10M significant power at frequencies in the 1MHz to 2MHz n Wide Supply Range, 5V to 15V range. Short-circuit protection and thermal shutdown n Full Rate, Downstream ADSL Supported insure the devices ruggedness. The LT1795 is stable with n Low Power Shutdown Mode large capacitive loads and can easily supply the large n Power Saving Adjustable Supply Current currents required by the capacitive loading. A shutdown n Stable with C = 10,000pF feature switches the device into a high impedance, low L n Power Enhanced Small Footprint Packages current mode, reducing power dissipation when the de- TSSOP-20, S0-20 Wide vice is not in use. For lower bandwidth applications, the n Available in a 20-Lead TSSOP Package supply current can be reduced with a single external U resistor. APPLICATIO S The LT1795 comes in the very small, thermally enhanced, n ADSL HDSL2, G.lite Drivers 20-lead TSSOP package for maximum port density in line n Buffers driver applications. n Test Equipment Amplifiers , LTC and LT are registered trademarks of Linear Technology Corporation. n Video Amplifiers n Cable Drivers TYPICAL APPLICATION Low Loss, High Power Central Office ADSL Line Driver + V +IN + 12.5 1/2 LT1795 1k 1:2* 165 100 1k 12.5 1/2 LT1795 IN + V 1795 TA01 * MIDCOM 50215 OR EQUIVALENT 1795fa 1 U ULT1795 ABSOLUTE AXI U RATI GS (Note 1) Specified Temperature Range (Note 3) ... 40C to 85C Supply Voltage ...................................................... 18V Junction Temperature........................................... 150C Input Current ...................................................... 15mA Storage Temperature Range ................. 65C to 150C Output Short-Circuit Duration (Note 2) ............ Indefinite Lead Temperature (Soldering, 10 sec).................. 300C Operating Temperature Range ................ 40C to 85C UUW PACKAGE/ORDER I FOR ATIO TOP VIEW TOP VIEW ORDER PART ORDER PART V 1 20 V 1 NUMBER COMP 20 COMP NUMBER + + NC 2 19 NC 2 V 19 V LT1795CFE LT1795CSW IN 3 18 OUT 3 OUT 18 OUT + LT1795IFE LT1795ISW +IN 4 17 V 4 V 17 V SHDN 5 16 COMP 5 V 16 V SHDNREF 6 15 COMP 6 V 15 V + +IN 7 14 V 7 V 14 V IN 8 13 OUT 8 IN 13 IN NC 9 12 NC 9 +IN 12 +IN V 10 11 V 10 SHDN 11 SHDNREF FE PACKAGE S PACKAGE 20-LEAD PLASTIC TSSOP 20-LEAD PLASTIC SW T = 150 C, = 40C/W (Note 4) T = 150 C, 40C/W (Note 4) JMAX JA JMAX JA UNDERSIDE METAL INTERNALLY CONNECTED TO V (PCB CONNECTION OPTIONAL) Consult LTC Marketing for parts specified with wider operating temperature ranges. ELECTRICAL CHARACTERISTICS The l denotes the specifications which apply over the full specified temperature range, otherwise specifications are at T = 25C. A V = 0V, 5V V 15V, pulse tested, V = 2.5V, V = 0V unless otherwise noted. (Note 3) CM S SHDN SHDNREF SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage 3 13 mV OS l 4.5 17 mV Input Offset Voltage Matching 1 3.5 mV l 1.5 5.0 mV Input Offset Voltage Drift l 10 V/C + I Noninverting Input Current 2 5 A IN l 8 20 A Noninverting Input Current Matching 0.5 2 A l 1.5 7 A I Inverting Input Current 10 70 A IN l 20 100 A Inverting Input Current Matching 10 30 A l 20 50 A e Input Noise Voltage Density f = 10kHz, R =1k, R = 10, R = 0 3.6 nV/Hz n F G S +i Input Noise Current Density f = 10kHz, R =1k, R = 10, R = 10k 2 pA/Hz n F G S i Input Noise Current Density f = 10kHz, R =1k, R = 10, R = 10k 30 pA/Hz n F G S 1795fa 2 U WWW