0.8mm 3mm LT1739 Dual 500mA, 200MHz xDSL Line Driver Amplifier FEATURES DESCRIPTIO n 3mm 4mm High Power DFN Package The LT 1739 is a 500mA minimum output current, dual op n Exceeds All Requirements For Full Rate, amp with outstanding distortion performance. The ampli- Downstream ADSL Line Drivers fiers are gain-of-ten stable, but can be easily compensated n 500mA Minimum I for lower gains. The extended output swing allows for OUT n 11.1V Output Swing, V = 12V, R = 100W lower supply rails to reduce system power. Supply current S L n 10.9V Output Swing, V = 12V, I = 250mA is set with an external resistor to optimize power dissipa- S L n Low Distortion: 82dBc at 1MHz, 2V Into 50W tion. The LT1739 features balanced, high impedance in- P-P n Power Saving Adjustable Supply Current puts with low input bias current and input offset voltage. n Power Enhanced TSSOP-20 Small Footprint Package Active termination is easily implemented for further sys- n 200MHz Gain Bandwidth tem power reduction. Short-circuit protection and thermal n 600V/m s Slew Rate shutdown insure the devices ruggedness. n Specified at 12V and 5V The outputs drive a 100W load to 11.1V with 12V U supplies, and 10.9V with a 250mA load. The LT1739 is a APPLICATIO S pin-for-pin replacement for the LT1794 in xDSL line driver applications and requires no circuit changes. n High Density ADSL Central Office Line Drivers n The LT1739 is available in the very small, thermally High Efficiency ADSL, HDSL2, G.lite, enhanced, 3mm 4mm DFN package or a 20-lead TSSOP SHDSL Line Drivers n for maximum port density in central office line driver Buffers n applications. For a dual version of the LT1739, see the Test Equipment Amplifiers n LT6301 data sheet. Cable Drivers , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO High Efficiency 12V Supply ADSL Central Office Line Driver 12V 3mm 4mm DFN Package R BIAS Bottom View 24.9k +IN + SHDN 12.7 1/2 LT1739 EXPOSED THERMAL PAD 1k 1:2* 110 100 1000pF 110 1739 TA01 1k *COILCRAFT X8390-A OR EQUIVALENT I = 10mA PER AMPLIFIER SUPPLY 12.7 1/2 WITH R = 24.9k BIAS LT1739 SHDNREF IN + 12V 1739fas, sn1739 1 4mm 1739 TA02 U ULT1739 ABSOLUTE MAXIMUM RATINGS (Note 1) + Supply Voltage (V to V ) ................................. 13.5V Junction Temperature Input Current ..................................................... 10mA FE Package ....................................................... 150 C Output Short-Circuit Duration (Note 2) ........... Indefinite UE Package ...................................................... 125 C Operating Temperature Range ............... 40 C to 85 C Storage Temperature Range Specified Temperature Range (Note 3) .. 40 C to 85 C FE Package ....................................... 65 C to 150 C UE Package ...................................... 65 C to 125 C Lead Temperature (Soldering, 10 sec).................. 300 C PACKAGE/ORDER INFORMATION TOP VIEW ORDER PART ORDER PART NUMBER NUMBER V 1 20 V TOP VIEW NC 2 19 NC LT1739CFE LT1739CUE IN A 1 12 V IN 3 18 OUT LT1739IFE LT1739IUE + +IN A 2 11 OUT A +IN 4 17 V + SHDN 3 10 V SHDN 5 16 NC + SHDNREF 6 15 NC SHDNREF 4 9 V + +IN 7 14 V +IN B 5 8 OUT B UE PART IN 8 13 OUT IN B 6 7 V MARKING NC 9 12 NC UE12 PACKAGE V 10 11 V 12-LEAD (4mm 3mm) PLASTIC DFN 1739 1739I T = 125 C, q = 60 C/W, q = 3 C/W (Note 4) JMAX JA JC FE PACKAGE 20-LEAD PLASTIC TSSOP UNDERSIDE METAL CONNECTED TO V T = 150 C, q = 40 C/W, q = 3 C/W (Note 4) JMAX JA JC UNDERSIDE METAL CONNECTED TO V 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 = 25 C. A + V = 0V, pulse tested, 5V V 12V, V = 0V, R = 24.9k between V and SHDN unless otherwise noted. (Note 3) CM S SHDNREF BIAS SYMBOL PARAMETER CONDITIONS MIN TYP MAX UNITS V Input Offset Voltage 15.0 mV OS l 7.5 mV Input Offset Voltage Matching 0.3 5.0 mV l 7.5 mV Input Offset Voltage Drift l 10 m V/ C I Input Offset Current 100 500 nA OS l 800 nA I Input Bias Current 0.1 4 m A B l 6 m A Input Bias Current Matching 100 500 nA l 800 nA e Input Noise Voltage Density f = 10kHz 8 nV/ Hz n i Input Noise Current Density f = 10kHz 0.8 pA/ Hz n 1739fas, sn1739 2 U W U U WWW