LT1168 Low Power, Single Resistor Gain Programmable, Precision Instrumentation Amplifier FEATURES DESCRIPTIO Supply Current: 530A Max The LT 1168 is a micropower, precision instrumentation am- Meets IEC 1000-4-2 Level 4 (15kV) ESD Tests plifier that requires only one external resistor to set gains of with Two External 5k Resistors 1 to 10,000. The low voltage noise of 10nV/Hz (at 1kHz) is Single Gain Set Resistor: G = 1 to 10,000 not compromised by low power dissipation (350A typical for 15V supplies). The wide supply range of 2.3V to 18V allows Gain Error: G = 10, 0.4% Max the LT1168 to fit into a wide variety of industrial as well as Input Offset Voltage Drift: 0.3V/C Max battery-powered applications. Gain Nonlinearity: G = 10, 20ppm Max Input Offset Voltage: 40V Max The high accuracy of the LT1168 is due to a 20ppm maximum Input Bias Current: 250pA Max nonlinearity and 0.4% max gain error (G = 10). Previous mono- PSRR at A =1: 103dB Min V lithic instrumentation amps cannot handle a 2k load resistor CMRR at A = 1: 90dB Min V whereas the nonlinearity of the LT1168 is specified for loads Wide Supply Range: 2.3V to 18V as low as 2k. The LT1168 is laser trimmed for very low input 1kHz Voltage Noise: 10nV/Hz offset voltage (40V max), drift (0.3V/C), high CMRR (90dB, 0.1Hz to 10Hz Noise: 0.28V P-P G = 1) and PSRR (103dB, G = 1). Low input bias currents of Available in 8-Pin PDIP and SO Packages 250pA max are achieved with the use of superbeta process- U ing. The output can handle capacitive loads up to 1000pF in APPLICATIO S any gain configuration while the inputs are ESD protected up to 13kV (human body). The LT1168 with two external 5k Bridge Amplifiers resistors passes the IEC 1000-4-2 level 4 specification. Strain Gauge Amplifiers The LT1168 is a pin-for-pin improved second source for the Thermocouple Amplifiers AD620 and INA118. The LT1168, offered in 8-pin PDIP and Differential to Single-Ended Converters SO packages, requires significantly less PC board area than Differential Voltage to Current Converters discrete op amp resistor designs. These advantages make Data Acquisition the LT1168 the most cost effective solution for precision Battery-Powered and Portable Equipment instrumentation amplifier applications. Medical Instrumentation , LT, LTC and LTM are registered trademarks of Linear Technology Corporation. Scales All other trademarks are the property of their respective owners. TYPICAL APPLICATIO Single Supply* Pressure Monitor Gain Nonlinearity BI TECHNOLOGIES 67-8-3 R40KQ, (0.02% RATIO MATCH) 5V 1 3 40k + 7 8 3.5k 3.5k REF R1 6 G = 200 LT1168 IN DIGITAL 249 ADC 20k DATA 3.5k 3.5k 1 LTC 1286 5 OUTPUT 3 + 2 4 1/2 1 AGND 40k LT1112 2 G = 1000 OUTPUT VOLTAGE (2V/DIV) 1168 TA01a R = 2k L 1168 TA01 V = 10V OUT *See Theory of Operation section 1168fa 1 NONLINEARITY (100ppm/DIV) U ULT1168 UUW ABSOLUTE AXI U RATI GS PACKAGE/ORDER I FOR ATIO (Note 1) ORDER PART Supply Voltage ...................................................... 20V NUMBER Differential Input Voltage (Within the Supply Voltage) ..................................................... 40V TOP VIEW LT1168ACN8 Input Voltage (Equal to Supply Voltage) ................ 20V R 1 8 R G G LT1168ACS8 Input Current (Note 2) ....................................... 20mA IN +V 2 7 S LT1168AIN8 Output Short-Circuit Duration (Note 3) ............ Indefinite + +IN 3 6 OUTPUT LT1168AIS8 Operating Temperature Range (Note 4) .. 40C to 85C V 4 5 REF S LT1168CN8 Specified Temperature Range LT1168CS8 N8 PACKAGE LT1168AC/LT1168C (Note 5) ............. 40C to 85C 8-LEAD PDIP LT1168IN8 S8 PACKAGE LT1168AI/LT1168I ............................. 40C to 85C LT1168IS8 8-LEAD PLASTIC SO Storage Temperature Range ................. 65C to 150C T = 150C, = 150C/ W (N8) JMAX JA T = 150C, = 190C/ W (S8) S8 PART MARKING JMAX JA Lead Temperature (Soldering, 10 sec).................. 300C 1168A 1168 Order Options Tape and Reel: Add TR 1168AI 1168I Lead Free: Add PBF Lead Free Tape and Reel: Add TRPBF Consult LTC Marketing for parts specified with wider operating temperature Lead Free Part Marking: