LT1920 Datasheet, PDF (1/12 Pages) Linear Technology – Single Resistor Gain Programmable, Precision Instrumentation Amplifier

FEATURES
s _{Single Gain Set Resistor: G = 1 to 10,000}
s _{Gain Error: G = 10, 0.3% Max}
s _{Gain Nonlinearity: G = 10, 30ppm Max}
s _{Input Offset Voltage: G = 10, 225µV Max}
s _{Input Offset Voltage Drift: 1µV/°C Max}
s _{Input Bias Current: 2nA Max}
s _{PSRR at G = 1: 80dB Min}
s _{CMRR at G = 1: 75dB Min}
s _{Supply Current: 1.3mA Max}
s _{Wide Supply Range: ± 2.3V to ±18V}
s _{1kHz Voltage Noise: 7.5nV/√Hz}
s _{0.1Hz to 10Hz Noise: 0.28µVP-P}
s _{Available in 8-Pin PDIP and SO Packages}
s _{Meets IEC 1000-4-2 Level 4 ESD Tests with}
Two External 5k Resistors
U
APPLICATIO S
s _{Bridge Amplifiers}
s _{Strain Gauge Amplifiers}
s _{Thermocouple Amplifiers}
s _{Differential to Single-Ended Converters}
s _{Medical Instrumentation}
LT1920
Single Resistor Gain
Programmable, Precision
Instrumentation Amplifier
DESCRIPTIO
The LT^®1920 is a low power, precision instrumentation
amplifier that requires only one external resistor to set gains
of 1 to 10,000. The low voltage noise of 7.5nV/√Hz (at 1kHz)
is not compromised by low power dissipation (0.9mA typical
for ±2.3V to ±15V supplies).
The high accuracy of 30ppm maximum nonlinearity and
0.3% max gain error (G = 10) is not degraded even for load
resistors as low as 2k (previous monolithic instrumentation
amps used 10k for their nonlinearity specifications). The
LT1920 is laser trimmed for very low input offset voltage
(125µV max), drift (1µV/°C), high CMRR (75dB, G = 1) and
PSRR (80dB, G = 1). Low input bias currents of 2nA max are
achieved with the use of superbeta processing. The output
can handle capacitive loads up to 1000pF in any gain configu-
ration while the inputs are ESD protected up to 13kV (human
body). The LT1920 with two external 5k resistors passes the
IEC 1000-4-2 level 4 specification.
The LT1920, offered in 8-pin PDIP and SO packages, is a pin
for pin and spec for spec improved replacement for the
AD620. The LT1920 is the most cost effective solution for
precision instrumentation amplifier applications. For even
better guaranteed performance, see the LT1167.
, LTC and LT are registered trademarks of Linear Technology Corporation.
TYPICAL APPLICATIO
Single Supply Barometer
V_S
R5
392k
1
LT1634CCZ-1.25
2
R4
50k
R3
50k
LUCAS NOVA SENOR
3₊
8
1/2
NPC-1220-015-A-3L
14
–¹
LT1490
2_–
4
5k
5k
R6
1k _{2 5k}
5k
6
+3
R_SET
V_S
2–
1
7
R1
825Ω
LT1920
R2
G = 60
12Ω ₈
3+
4
5₊
5
1/2
7
LT1490
R8 ^{6 –}
R7
100k
50k
V_S = 8V TO 30V
6
5
TO
4-DIGIT
DVM
VOLTS
2.800
3.000
3.200
INCHES Hg
28.00
30.00
32.00
1920 TA01
Gain Nonlinearity
OUTPUT VOLTAGE (2V/DIV)
G = 1000
RL = 1k
VOUT = ±10V
1167 TA02
1