LT1920
Single Resistor Gain
Programmable, Precision
Instrumentation Amplifier
FEATURES
s
s
s
s
s
s
s
s
s
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DESCRIPTIO
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, 225碌V Max
Input Offset Voltage Drift: 1
碌
V/
擄
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:
鹵
2.3V to
鹵18V
1kHz Voltage Noise: 7.5nV/鈭欻z
0.1Hz to 10Hz Noise: 0.28碌V
P-P
Available in 8-Pin PDIP and SO Packages
Meets IEC 1000-4-2 Level 4 ESD Tests with
Two External 5k Resistors
APPLICATIO S
s
s
s
s
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Bridge Amplifiers
Strain Gauge Amplifiers
Thermocouple Amplifiers
Differential to Single-Ended Converters
Medical Instrumentation
The LT
廬
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/鈭欻z (at 1kHz)
is not compromised by low power dissipation (0.9mA typical
for
鹵2.3V
to
鹵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
(125碌V max), drift (1碌V/擄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
V
S
R5
392k
1
LT1634CCZ-1.25
2
2
Single Supply Barometer
Gain Nonlinearity
鈥?/div>
鈥?/div>
5k
R6
1k
5k
R1
825鈩?/div>
2
6
R4
50k
R3
50k
6
R8
100k
R
SET
5
5k
5k
R2
12鈩?/div>
8
3
LT1920
G = 60
5
4
TO
4-DIGIT
DVM
6
1
2
1
+
鈥?/div>
1/2
LT1490
4
1
4
7
+
1/2
LT1490
7
R7
50k
5
鈥?/div>
V
S
= 8V TO 30V
+
+
3
NONLINEARITY (100ppm/DIV)
OUTPUT VOLTAGE (2V/DIV)
G = 1000
R
L
= 1k
V
OUT
=
鹵10V
3
8
LUCAS NOVA SENOR
NPC-1220-015-A-3L
V
S
VOLTS
2.800
3.000
3.200
INCHES Hg
28.00
30.00
32.00
1920 TA01
U
1167 TA02
U
U
1
LT1920I相關(guān)型號(hào)PDF文件下載
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