LT1792 Low Noise, Precision, JFET Input Op Amp FEATURES DESCRIPTIO n The LT 1792 achieves a new standard of excellence in 100% Tested Low Voltage Noise: 6nV/ Hz Max n noise performance for a JFET op amp. The 4.2nV/ Hz A Grade 100% Temperature Tested n voltage noise combined with low current noise and Voltage Gain: 1.2 Million Min n picoampere bias currents make the LT1792 an ideal choice Offset Voltage Over Temp: 800m V Max n for amplifying low level signals from high impedance Gain-Bandwidth Product: 5.6MHz Typ n capacitive transducers. Guaranteed Specifications with 5V Supplies The LT1792 is unconditionally stable for gains of 1 or more, U even with load capacitances up to 1000pF. Other key APPLICATIO S features are 600m V V and a voltage gain of over 4 million. OS n Photocurrent Amplifiers Each individual amplifier is 100% tested for voltage noise, n Hydrophone Amplifiers slew rate and gain bandwidth. n High Sensitivity Piezoelectric Accelerometers The design of the LT1792 has been optimized to achieve n Low Voltage and Current Noise Instrumentation true precision performance with an industry standard Amplifier Front Ends pinout in the SO-8 package. Specifications are also pro- n Two and Three Op Amp Instrumentation Amplifiers vided for 5V supplies. n Active Filters , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Low Noise Hydrophone Amplifier with DC Servo 1kHz Input Noise Voltage Distribution 5V TO 15V V = 15V 270 OP AMPS TESTED S R3 R1* 40 T = 25C A 3.9k 100M 7 2 6 LT1792 OUTPUT 30 3 + C2 C1* R2 4 0.47m F 200W 20 5V TO 15V R4 1M R8 2 C R6 T 100M 10 100k HYDRO- 6 R5 LT1097 PHONE 1M 3 R7 1M 0 3.6 3.8 4.0 4.2 4.6 5.0 5.2 5.4 5.6 4.4 4.8 INPUT VOLTAGE NOISE (nV/ Hz) DC OUTPUT 2.5mV FOR T < 70C A 1792 TA02 OUTPUT VOLTAGE NOISE = 128nV/ Hz AT 1kHz (GAIN = 20) 1792 TA01 C1 C 100pF TO 5000pF R4C2 > R8C *OPTIONAL T T 1 PERCENT OF UNITS (%) + U ULT1792 ABSOLUTEXAI U RATI GS (Note 1) Supply Voltage ..................................................... 20V Specified Temperature Range Differential Input Voltage ...................................... 40V Commercial (Note 8) ......................... 40 C to 85 C Input Voltage (Equal to Supply Voltage) ............... 20V Industrial ........................................... 40 C to 85 C Output Short-Circuit Duration ........................ Indefinite Storage Temperature Range ................ 65 C to 150 C Operating Temperature Range............... 40 C to 85 C Lead Temperature (Soldering, 10 sec) ................ 300 C PACKAGE/ORDER I FOR ATIO ORDER PART ORDER PART NUMBER NUMBER TOP VIEW TOP VIEW V ADJ V ADJ 1 NC 1 8 NC OS 8 OS LT1792ACN8 LT1792ACS8 + IN A V+ IN A 2 7 V 2 7 LT1792CS8 LT1792CN8 A A +IN A +IN A OUT 3 6 OUT 3 6 LT1792AIS8 LT1792AIN8 V V 4 V ADJ V ADJ LT1792IS8 5 4 5 OS OS LT1792IN8 N8 PACKAGE S8 PACKAGE S8 PART MARKING 8-LEAD PDIP 8-LEAD PLASTIC SO T = 140 C, q = 130 C/W T = 160 C, q = 190 C/W JMAX JA JMAX JA 1792A 1792AI 1792 1792I Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS T = 25 C, V = 15V, V = 0V, unless otherwise noted. (Note 9) A S CM LT1792AC/LT1792AI LT1792C/LT1792I SYMBOL PARAMETER CONDITIONS (Note 2) MIN TYP MAX MIN TYP MAX UNITS V Input Offset Voltage 0.2 0.6 0.2 0.8 mV OS V = 5V 0.4 1.0 0.4 1.3 mV S I Input Offset Current Warmed Up (Note 3) 100 400 100 400 pA OS I Input Bias Current Warmed Up (Note 3) 300 800 300 800 pA B e Input Noise Voltage 0.1Hz to 10Hz 2.4 2.4 m V n P-P Input Noise Voltage Density f = 10Hz 8.3 8.3 nV/ Hz O f = 1000Hz 4.2 6.0 4.2 6.0 nV/ Hz O i Input Noise Current Density f = 10Hz, f = 1000Hz (Note 4) 10 10 fA/ Hz n O O R Input Resistance IN 11 11 Differential Mode 10 10 W 11 11 Common Mode V = 10V to 8V 10 10 W CM 10 10 V = 8V to 11V 10 10 W CM C Input Capacitance 14 14 pF IN V = 5V 27 27 pF S V Input Voltage Range (Note 5) 13.0 13.5 13.0 13.5 V CM 10.5 11.0 10.5 11.0 V CMRR Common Mode Rejection Ratio V = 10V to 13V 85 105 82 100 dB CM PSRR Power Supply Rejection Ratio V = 4.5V to 20V 88 105 83 98 dB S 2 U WU U W W W