LT1789-1/LT1789-10 Micropower, Single Supply Rail-to-Rail Output Instrumentation Amplifiers FEATURESDESCRIPTION n Micropower: 95μA Supply Current Max The LT®1789-1/LT1789-10 are micropower, precision n Low Input Offset Voltage: 100μV Max instrumentation amplifiers that are optimized for single n Low Input Offset Voltage Drift: 0.5μV/°C Max supply operation from 2.2V to 36V. The quiescent current n Single Gain Set Resistor: is 95μA max, the inputs common mode to ground and the G = 1 to 1000 (LT1789-1) output swings within 110mV of ground. The gain is set G = 10 to 1000 (LT1789-10) with a single external resistor for a gain range of 1 to 1000 n Inputs Common Mode to V– for the LT1789-1 and 10 to 1000 for the LT1789-10. n Wide Supply Range: 2.2V to 36V Total Supply The high accuracy of the LT1789-1 (40ppm maximum non- n CMRR at G = 10: 96dB Min linearity and 0.25% max gain error) is unmatched by other n Gain Error: G = 10, 0.25% Max micropower instrumentation amplifiers. The LT1789-10 n Gain Nonlinearity: G = 10, 40ppm Max maximizes both the input common mode range and dynamic n Input Bias Current: 40nA Max output range when an amplification of 10 or greater is required, n PSRR at G = 10: 100dB Min allowing precise signal processing where other instrumenta- n 1kHz Voltage Noise: 48nV/√Hz tion amplifiers fail to operate. The LT1789-1/LT1789-10 are n 0.1Hz to 10Hz Noise: 1.5μVP-P laser trimmed for very low input offset voltage, low input offset voltage drift, high CMRR and high PSRR. The output APPLICATIONS can handle capacitive loads up to 400pF (LT1789-1), 1000pF (LT1789-10) in any gain configuration while the inputs are n Portable Instrumentation ESD protected up to 10kV (human body). n Bridge Amplifiers n Strain Gauge Amplifiers The LT1789-1/LT1789-10 are offered in the 8-pin SO n Thermocouple Amplifiers package, requiring significantly less PC board area than n Differential to Single-Ended Converters discrete multi op amp and resistor designs. n Medical Instrumentation L, LT, LTC, LTM, Linear Technology and the Linear logo are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners. TYPICAL APPLICATION0.5A to 4A Voltage Controlled Current Source C1 4700pF VS C3 VS 120Ω R1 0.1μF 8k 90.9k 2 – 7 R3 V TIP127* IN 100Ω R2 6 LT1636 10k 3 + 5 VS * ENSURE ADEQUATE POWER DISSIPATION CAPABILITY AT 4 7 3 HIGHER VOLTAGES, + 3 CURRENTS AND DUTY CYCLES R4 8 10k 1 6 LT1789-1 RSENSE* REF 0.1Ω I 2 LOAD C2 V 1 S = 3.3V TO 32V 3300pF 5 V 4 I IN LOAD = – R 2 SENSE • 10 4 RLOAD* = 1A PER VOLT AS SHOWN RISE TIME ≈ 250μs, 10% TO 90%, 1A TO 2A OUTPUT STEP INTO 0.25Ω LOAD 1789 TA01 1789fc 1
