LINEAR TECHNOLOGY LT1789-1 LT1789-10 Specifications User Guide

LT1789-1/LT1789-10 Micropower, Single Supply Rail-to-Rail

Output Instrumentation Amplifi ers

FEATURES DESCRIPTION n Micropower: 95μA Supply Current Max

The LT®1789-1/LT1789-10 are micropower, precision

n Low Input Offset Voltage: 100μV Max

instrumentation amplifi ers 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 110m V 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: 96d B Min

linearity and 0.25% max gain error) is unmatched by other

n Gain Error: G = 10, 0.25% Max

micropower instrumentation amplifi ers. The LT1789-10

n Gain Nonlinearity: G = 10, 40ppm Max

maximizes both the input common mode range and dynamic

n Input Bias Current: 40n A Max

output range when an amplifi cation of 10 or greater is required,

n PSRR at G = 10: 100d B Min

allowing precise signal processing where other instrumenta-

n 1k Hz Voltage Noise: 48n V/√Hz

tion amplifi ers 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 400p F (LT1789-1), 1000p F (LT1789-10) in any gain confi guration while the inputs are

n Portable Instrumentation

ESD protected up to 10k V (human body).

n Bridge Amplifi ers

n Strain Gauge Amplifi ers

The LT1789-1/LT1789-10 are offered in the 8-pin SO

n Thermocouple Amplifi ers

package, requiring signifi cantly less PC board area than

n Differential to Single-Ended Converters

discrete multi op amp and resistor designs.

n Medical Instrumentation

L, LT, LTC and LTM are registered trademarks of Linear Technology Corporation. All other trademarks are the property of their respective owners.

TYPICAL APPLICATION

0.5A to 4A Voltage Controlled Current Source C1

VS C3

R3 TIP127*

LT1636

VS * ENSURE ADEQUATE POWER DISSIPATION CAPABILITY AT HIGHER VOLTAGES, CURRENTS AND DUTY CYCLES

LT1789-1 RSENSE*

REF 0.1Ω ILOAD

VS = 3.3V TO 32V

ILOAD = RSENSE • 10

RLOAD*

= 1A PER VOLT AS SHOWN RISE TIME ≈ 250μs, 10% TO 90%,

1A TO 2A OUTPUT STEP INTO 0.25Ω LOAD 1789 TA01

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