LT1789-1 Datasheet, PDF (1/24 Pages) Linear Technology – Micropower, Single Supply Rail-to-Rail Output Instrumentation Amplifiers

LT1789-1/LT1789-10
Micropower,
Single Supply Rail-to-Rail
Output Instrumentation Amplifiers
FEATURES
s _{Micropower: 95µA Supply Current Max}
s _{Low Input Offset Voltage: 100µV Max}
s _{Low Input Offset Voltage Drift: 0.5µV/°C Max}
s _{Single Gain Set Resistor:}
G = 1 to 1000 (LT1789-1)
G = 10 to 1000 (LT1789-10)
s _{Inputs Common Mode to V}^–
s _{Wide Supply Range: 2.2V to 36V Total Supply}
s _{CMRR at G = 10: 96dB Min}
s _{Gain Error: G = 10, 0.25% Max}
s _{Gain Nonlinearity: G = 10, 40ppm Max}
s _{Input Bias Current: 40nA Max}
s _{PSRR at G = 10: 100dB Min}
s _{1kHz Voltage Noise: 48nV/√Hz}
U ^{s 0.1Hz to 10Hz Noise: 1.5µVP-P}
APPLICATIO S
s _{Portable Instrumentation}
s _{Bridge Amplifiers}
s _{Strain Gauge Amplifiers}
s _{Thermocouple Amplifiers}
s _{Differential to Single-Ended Converters}
s _{Medical Instrumentation}
DESCRIPTIO
The LT^®1789-1/LT1789-10 are micropower, precision in-
strumentation amplifiers that are optimized for single supply
operation from 2.2V to 36V. The quiescent current is 95µA
max, the inputs common mode to ground and the output
swings within 110mV of ground. The gain is set with a single
external resistor for a gain range of 1 to 1000 for the LT1789-
1 and 10 to 1000 for the LT1789-10.
The high accuracy of the LT1789-1 (40ppm maximum
nonlinearity and 0.25% max gain error) is unmatched by
other micropower instrumentation amplifiers. The LT1789-10
maximizes both the input common mode range and dynamic
output range when an amplification of 10 or greater is
required, allowing precise signal processing where other
instrumentation amplifiers fail to operate. The LT1789-1/
LT1789-10 are laser trimmed for very low input offset
voltage, low input offset voltage drift, high CMRR and high
PSRR. The output can handle capacitive loads up to 400pF
(LT1789-1), 1000pF (LT1789-10) in any gain configuration
while the inputs are ESD protected up to 10kV (human body).
The LT1789-1/LT1789-10 are offered in the 8-pin SO pack-
age, requiring significantly less PC board area than discrete
multi op amp and resistor designs.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
0.5A to 4A Voltage Controlled Current Source
C1
4700pF
V_S
R1
90.9k
V_IN
R2
10k
V_S
2– 7
6
LT1636
3+
5
4
R4
10k
6
V_S = 3.3V TO 32V
I_LOAD
=
V_IN
R_SENSE •
10
= 1A PER VOLT AS SHOWN
RISE TIME ≈ 250µs, 10% TO 90%,
1A TO 2A OUTPUT STEP INTO 0.25Ω LOAD
C2
3300pF
C3
0.1µF
R3
100Ω
8k ^120Ω
TIP127*
V_S
7
3
8
LT1789-1
REF
1
5
42
* ENSURE ADEQUATE POWER
DISSIPATION CAPABILITY AT
HIGHER VOLTAGES,
3
CURRENTS AND DUTY CYCLES
1
R_SENSE*
2 ^{0.1Ω I}LOAD
4
R_LOAD*
1789 TA01
1789f
1