LT1920 Single Resistor Gain Programmable, Precision Instrumentation Amplifier FEATURES DESCRIPTIO n Single Gain Set Resistor: G = 1 to 10,000 The LT 1920 is a low power, precision instrumentation n Gain Error: G = 10, 0.3% Max amplifier that requires only one external resistor to set gains n Gain Nonlinearity: G = 10, 30ppm Max of 1 to 10,000. The low voltage noise of 7.5nV/Hz (at 1kHz) n Input Offset Voltage: G = 10, 225V Max is not compromised by low power dissipation (0.9mA typical n Input Offset Voltage Drift: 1V/C Max for 2.3V to 15V supplies). n Input Bias Current: 2nA Max The high accuracy of 30ppm maximum nonlinearity and n PSRR at G = 1: 80dB Min 0.3% max gain error (G = 10) is not degraded even for load n CMRR at G = 1: 75dB Min resistors as low as 2k (previous monolithic instrumentation n Supply Current: 1.3mA Max amps used 10k for their nonlinearity specifications). The n Wide Supply Range: 2.3V to 18V LT1920 is laser trimmed for very low input offset voltage n 1kHz Voltage Noise: 7.5nV/Hz (125V max), drift (1V/C), high CMRR (75dB, G = 1) and n 0.1Hz to 10Hz Noise: 0.28V P-P PSRR (80dB, G = 1). Low input bias currents of 2nA max are n Available in 8-Pin PDIP and SO Packages achieved with the use of superbeta processing. The output n Meets IEC 1000-4-2 Level 4 ESD Tests with can handle capacitive loads up to 1000pF in any gain configu- Two External 5k Resistors ration while the inputs are ESD protected up to 13kV (human body). The LT1920 with two external 5k resistors passes the U IEC 1000-4-2 level 4 specification. APPLICATIO S The LT1920, offered in 8-pin PDIP and SO packages, is a pin n Bridge Amplifiers for pin and spec for spec improved replacement for the n Strain Gauge Amplifiers AD620. The LT1920 is the most cost effective solution for n Thermocouple Amplifiers precision instrumentation amplifier applications. For even n Differential to Single-Ended Converters better guaranteed performance, see the LT1167. n Medical Instrumentation , LTC and LT are registered trademarks of Linear Technology Corporation. TYPICAL APPLICATIO Single Supply Barometer V S Gain Nonlinearity R5 LUCAS NOVA SENOR V S 392k NPC-1220-015-A-3L 3 8 + 1 2 1 1/2 4 7 1 1 LT1490 5k 5k LT1634CCZ-1.25 2 R1 4 2 6 825 LT1920 R6 G = 60 1k R2 2 5k 5k 12 8 5 TO 6 + 3 3 + 4-DIGIT R4 R 4 SET DVM 50k 5 5 + OUTPUT VOLTAGE (2V/DIV) R3 7 1/2 50k G = 1000 LT1490 = 1k RL 6 V = 10V 1167 TA02 OUT R7 R8 VOLTS INCHES Hg 100k 50k 2.800 28.00 V = 8V TO 30V S 3.000 30.00 3.200 32.00 1920 TA01 1 NONLINEARITY (100ppm/DIV) U ULT1920 ABSOLUTE MAXIMUM RATINGS PACKAGE/ORDER INFORMATION (Note 1) ORDER PART TOP VIEW Supply Voltage ...................................................... 20V NUMBER Differential Input Voltage (Within the R 1 8 R G G LT1920CN8 Supply Voltage) ..................................................... 40V IN 2 +V 7 S LT1920CS8 + Input Voltage (Equal to Supply Voltage) ................ 20V +IN 3 6 OUTPUT LT1920IN8 V REF Input Current (Note 3) ........................................ 20mA 4 5 S LT1920IS8 Output Short-Circuit Duration .......................... Indefinite N8 PACKAGE 8-LEAD PDIP Operating Temperature Range ................ 40C to 85C S8 PACKAGE Specified Temperature Range S8 PART MARKING 8-LEAD PLASTIC SO LT1920C (Note 4) .................................... 0C to 70C T = 150C, = 130C/ W (N8) JMAX JA 1920 T = 150C, = 190C/ W (S8) LT1920I .............................................. 40C to 85C JMAX JA 1920I Storage Temperature Range ................. 65C to 150C Lead Temperature (Soldering, 10 sec).................. 300C Consult factory for Military grade parts. ELECTRICAL CHARACTERISTICS V = 15V, V = 0V, T = 25C, R = 2k, unless otherwise noted. S CM A L SYMBOL PARAMETER CONDITIONS (Note 6) MIN TYP MAX UNITS G Gain Range G = 1 + (49.4k/R ) 1 10k G Gain Error G = 1 0.008 0.1 % G = 10 (Note 2) 0.010 0.3 % G = 100 (Note 2) 0.025 0.3 % G = 1000 (Note 2) 0.040 0.35 % G/T Gain vs Temperature G < 1000 (Note 2) l 20 50 ppm/C Gain Nonlinearity (Note 5) V = 10V, G = 1 10 ppm O V = 10V, G = 10 and 100 10 30 ppm O V = 10V, G = 100 and 1000 20 ppm O V Total Input Referred Offset Voltage V = V + V /G OST OST OSI OSO V Input Offset Voltage G = 1000, V = 5V to 15V 30 125 V OSI S G = 1000, V = 5V to 15V l 185 V S V /T Input Offset Drift (RTI) (Note 3) l 1 V/C OSI V Output Offset Voltage G = 1, V = 5V to 15V 400 1000 V OSO S G = 1, V = 5V to 15V l 1500 V S V /T Output Offset Drift (Note 3) l 515 V/C OSO I Input Offset Current 0.3 1 nA OS I Input Bias Current 0.5 2 nA B e Input Noise Voltage, RTI 0.1Hz to 10Hz, G = 1 2.00 V n P-P 0.1Hz to 10Hz, G = 10 0.50 V P-P 0.1Hz to 10Hz, G = 100 and 1000 0.28 V P-P 2 2 Total RTI Noise = e + (e /G) ni no e Input Noise Voltage Density, RTI f = 1kHz 7.5 nV/Hz ni O e Output Noise Voltage Density, RTI f = 1kHz 67 nV/Hz no O i Input Noise Current f = 0.1Hz to 10Hz 10 pA n O P-P Input Noise Current Density f = 10Hz 124 fA/Hz O R Input Resistance V = 10V 200 G IN IN C Differential Input Capacitance f = 100kHz 1.6 pF IN(DIFF) O 2 U W U U WWW