LT1994 Low Noise, Low Distortion Fully Differential Input/ Output Ampli er/Driver FEATURES DESCRIPTION n Fully Differential Input and Output The LT 1994 is a high precision, very low noise, low distor- n Wide Supply Range: 2.375V to 12.6V tion, fully differential input/output ampli er optimized for n Rail-to-Rail Output Swing 3V, single-supply operation. The LT1994s output common n Low Noise: 3nV/Hz mode voltage is independent of the input common mode n Low Distortion, 2V , 1MHz: 94dBc voltage, and is adjustable by applying a voltage on the P-P n Adjustable Output Common Mode Voltage V pin. A separate internal common mode feedback OCM n Unity-Gain Stable path provides accurate output phase balancing and reduced n Gain-Bandwidth: 70MHz even-order harmonics. This makes the LT1994 ideal for n Slew Rate: 65V/s level shifting ground referenced signals for driving dif- n Large Output Current: 85mA ferential input, single-supply ADCs. n DC Voltage Offset <2mV Max The LT1994 output can swing rail-to-rail and is capable n Open-Loop Gain: 100V/mV of sourcing and sinking up to 85mA. In addition to the n Low Power Shutdown low distortion characteristics, the LT1994 has a low input n 8-Pin MSOP or 3mm 3mm DFN Package referred voltage noise of 3nV/Hz. This part maintains its performance for supply voltages as low as 2.375V. It APPLICATIONS draws only 13.3mA of supply current and has a hardware n shutdown feature that reduces current consumption to Differential Input A/D Converter Driver n 225A. Single-Ended to Differential Conversion n Differential Ampli cation with Common Mode The LT1994 is available in an 8-pin MSOP or 8-pin DFN Translation package. n Rail-to-Rail Differential Line Driver/Receiver L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. n All other trademarks are the property of their respective owners. Low Voltage, Low Noise, Differential Signal Processing TYPICAL APPLICATION LT1994 Driving an LTC1403A-1 1MHz Sine Wave, 8192 Point FFT Plot A/D Preampli er: Single-Ended Input to Differential Output 0 with Common Mode Level Shifting f = 2.8Msps SAMPLE 10 f = 1.001MHz IN 499 499 3V INPUT = 2V , 20 10F P-P SINGLE ENDED 3V 30 V IN SFDR = 93dB 0.1F 2V P-P 40 50 24.9 V SD0 DD + 60 + A IN CONV 70 V LT1994 47pF LTC1403A-1 OCM 24.9 SCK 50.4MHz 80 0.1F + A IN 90 V GND REF 100 V = 1.5V 10F OCM 110 499 499 1994 TA01 120 0 0.35 0.70 1.05 1.40 FREQUENCY (MHz) 1994 TA01b 1994fb 1 DIFFERENTIAL OUTPUT MAGNITUDE (dB)LT1994 ABSOLUTE MAXIMUM RATINGS (Note 1) + Total Supply Voltage (V to V ) ..............................12.6V Speci ed Temperature Range (Note 5) Input Voltage (Note 2) ...............................................V LT1994C ................................................... 0C to 70C S Input Current (Note 2) ..........................................10mA LT1994I ................................................ 40C to 85C Input Current (V , SHDN) ................................10mA LT1994H ............................................ 40C to 125C OCM V , SHDN..............................................................V LT1994MP.......................................... 55C to 125C OCM S Output Short-Circuit Duration (Note 3) ............ Inde nite Junction Temperature ........................................... 150C Operating Temperature Range (Note 4) Storage Temperature Range ................... 65C to 150C LT1994C ............................................... 40C to 85C LT1994I ................................................ 40C to 85C LT1994H ............................................ 40C to 125C LT1994MP.......................................... 55C to 125C PIN CONFIGURATION TOP VIEW + TOP VIEW IN 1 8 IN + IN 1 8 IN V 2 7 SHDN OCM V 2 7 SHDN OCM + + V 3 6 V V 3 6 V + + OUT 4 5 OUT OUT 4 5 OUT MS8 PACKAGE 8-LEAD PLASTIC MSOP DD PACKAGE T = 150C, = 140C/W 8-LEAD (3mm s 3mm) PLASTIC DFN JMAX JA T = 150C, = 43C/W JMAX JA EXPOSED PAD (PIN 9) IS GND, MUST BE SOLDERED TO V ORDER INFORMATION LEAD FREE FINISH TAPE AND REEL PART MARKING* PACKAGE DESCRIPTION SPECIFIED TEMPERATURE RANGE LT1994CDD PBF LT1994CDD TRPBF LBQM 8-Lead (3mm 3mm) Plastic DFN 0C to 70C LT1994IDD PBF LT1994IDD TRPBF LBQM 40C to 85C 8-Lead (3mm 3mm) Plastic DFN LT1994HDD PBF LT1994HDD TRPBF LBQM 40C to 125C 8-Lead (3mm 3mm) Plastic DFN LT1994MPDD PBF LT1994MPDD TRPBF LDXQ 8-Lead (3mm 3mm) Plastic DFN 55C to 125C LT1994CMS8 PBF LT1994CMS8 TRPBF LTBQN 8-Lead Plastic MSOP 0C to 70C LT1994IMS8 PBF LT1994IMS8 TRPBF LTBQN 8-Lead Plastic MSOP 40C to 85C Consult LTC Marketing for parts speci ed with wider operating temperature ranges. *The temperature grade is identi ed by a label on the shipping container. Consult LTC Marketing for information on non-standard lead based nish parts. For more information on lead free part marking, go to: