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LT1920
Single Resistor Gain
Programmable, Precision
Instrumentation Amplifier
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.
■
Single Gain Set Resistor: G = 1 to 10,000
■
Gain Error: G = 10, 0.3% Max
■
Gain Nonlinearity: G = 10, 30ppm Max
■
Input Offset Voltage: G = 10, 225µV Max
■
Input Offset Voltage Drift: 1
µ
V/
°
C Max
■
Input Bias Current: 2nA Max
■
PSRR at G = 1: 80dB Min
■
CMRR at G = 1: 75dB Min
■
Supply Current: 1.3mA Max
■
Wide Supply Range: ±2.3V to ±18V
■
1kHz Voltage Noise: 7.5nV/√Hz
■
0.1Hz to 10Hz Noise: 0.28µV
P-P
■
Available in 8-Pin PDIP and SO Packages
■
Meets IEC 1000-4-2 Level 4 ESD Tests with
Two External 5k Resistors
, LTC and LT are registered trademarks of Linear Technology Corporation.
■
Bridge Amplifiers
■
Strain Gauge Amplifiers
■
Thermocouple Amplifiers
■
Differential to Single-Ended Converters
■
Medical Instrumentation
NONLINEARITY (100ppm/DIV)
OUTPUT VOLTAGE (2V/DIV)
G = 1000
R
L
= 1k
V
OUT
= ±10V
1167 TA02
Gain Nonlinearity
Single Supply Barometer
–
+
+
–
–
+
2
1
1
1
1
2
R5
392k
R4
50k
R3
50k
R8
100k
R6
1k
LT1634CCZ-1.25
8
4
1/2
LT1490
3
R
SET
V
S
= 8V TO 30V
5k
5k
5k
5k
V
S
5
4
3
2
–
+
7
1/2
LT1490
5
6
2
8
LUCAS NOVA SENOR
NPC-1220-015-A-3L
7
V
S
6
1920 TA01
5
TO
4-DIGIT
DVM
4
R2
12Ω
LT1920
G = 60
R1
825Ω
3
6
R7
50k
VOLTS
2.800
3.000
3.200
INCHES Hg
28.00
30.00
32.00
FEATURES
DESCRIPTIO
U
APPLICATIO S
U
TYPICAL APPLICATIO
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