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PDF LT1920CN8 Data sheet ( Hoja de datos )
| Número de pieza | LT1920CN8 | |
| Descripción | Single Resistor Gain Programmable/ Precision Instrumentation Amplifier | |
| Fabricantes | Linear Technology | |
| Logotipo |  |
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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
VS
R5
392k
LT1634CCZ-1.25
1
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
RSET
+3
2–
1
VS
7
R1
825Ω
LT1920
R2 G = 60
12Ω 8
3+
4
5+
1/2 7
LT1490
R8 6 –
R7
100k 50k
5
VS = 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
1 page  
TYPICAL PERFOR A CE CHARACTERISTICS
LT1920
Positive Power Supply Rejection
Ratio vs Frequency
160
140
G = 10
120
G = 100
V – = – 15V
TA = 25°C
G = 1000
100 G = 1
80
60
40
20
0
0.1 1 10 100 1k 10k 100k
FREQUENCY (Hz)
1920 G16
Voltage Noise Density
vs Frequency
1000
VS = ±15V
TA = 25°C
1/fCORNER = 10Hz
100 GAIN = 1
1/fCORNER = 9Hz
GAIN = 10
10 1/fCORNER = 7Hz GAIN = 100, 1000
BW LIMIT
GAIN = 1000
0
1 10 100 1k 10k 100k
FREQUENCY (Hz)
1920 G19
Current Noise Density
vs Frequency
1000
VS = ±15V
TA = 25°C
Gain vs Frequency
60
G = 1000
50
G = 100
40
30
G = 10
20
10
G=1
0
–10 VS = ± 15V
TA = 25°C
– 20
0.01 0.1
1
10
FREQUENCY (kHz)
100 1000
1920 G17
0.1Hz to 10Hz Noise Voltage,
G=1
VS = ±15V
TA = 25°C
0 1 2 3 4 5 6 7 8 9 10
TIME (SEC)
1920 G20
0.1Hz to 10Hz Current Noise
VS = ±15V
TA = 25°C
100
RS
10
1
10 100
FREQUENCY (Hz)
1000
1920 G22
0 1 2 3 4 5 6 7 8 9 10
TIME (SEC)
1920 G23
Supply Current vs Supply Voltage
1.50
1.25
85°C
1.00 25°C
– 40°C
0.75
0.50
0
5 10 15
SUPPLY VOLTAGE (± V)
20
1920 G18
0.1Hz to 10Hz Noise Voltage, RTI
G = 1000
VS = ±15V
TA = 25°C
0 1 2 3 4 5 6 7 8 9 10
TIME (SEC)
1920 G21
Short-Circuit Current vs Time
50
VS = ±15V
40
30 TA = – 40°C
20 TA = 25°C
10 TA = 85°C
0
– 10
TA = 85°C
– 20
– 30
TA = – 40°C
TA = 25°C
– 40
– 50
0 12
3
TIME FROM OUTPUT SHORT TO GROUND (MINUTES)
1920 G24
5
5 Page 
LT1920
APPLICATIONS INFORMATION
To significantly reduce the effect of these out-of-band
signals on the input offset voltage of instrumentation
amplifiers, simple lowpass filters can be used at the
inputs. This filter should be located very close to the input
pins of the circuit. An effective filter configuration is
illustrated in Figure 5, where three capacitors have been
added to the inputs of the LT1920. Capacitors CXCM1 and
CXCM2 form lowpass filters with the external series resis-
tors RS1, 2 to any out-of-band signal appearing on each of
the input traces. Capacitor CXD forms a filter to reduce any
unwanted signal that would appear across the input traces.
An added benefit to using CXD is that the circuit’s AC
common mode rejection is not degraded due to common
mode capacitive imbalance. The differential mode and
common mode time constants associated with the capaci-
tors are:
tDM(LPF) = (2)(RS)(CXD)
tCM(LPF) = (RS1, 2)(CXCM1, 2)
Setting the time constants requires a knowledge of the
frequency, or frequencies of the interference. Once this
frequency is known, the common mode time constants
can be set followed by the differential mode time constant.
Set the common mode time constants such that they do
not degrade the LT1920’s inherent AC CMR. Then the
differential mode time constant can be set for the band-
width required for the application. Setting the differential
mode time constant close to the sensor’s BW also mini-
mizes any noise pickup along the leads. To avoid any
possibility of inadvertently affecting the signal to be pro-
cessed, set the common mode time constant an order of
magnitude (or more) larger than the differential mode time
constant. To avoid any possibility of common mode to
differential mode signal conversion, match the common
mode time constants to 1% or better. If the sensor is an
RTD or a resistive strain gauge, then the series resistors
RS1, 2 can be omitted, if the sensor is in proximity to the
instrumentation amplifier.
RS1 CXCM1
1.6k 0.001µF
IN +
V+
+
CXD
0.1µF
RS2
1.6k
IN –
CXCM2
0.001µF
EXTERNAL RFI
FILTER
f(–3dB) ≈ 500Hz
RG LT1920
–
V–
VOUT
1920 F05
Figure 5. Adding a Simple RC Filter at the Inputs to an
Instrumentation Amplifier is Effective in Reducing Rectification
of High Frequency Out-of-Band Signals
PACKAGE DESCRIPTION Dimensions in inches (millimeters) unless otherwise noted.
0.300 – 0.325
(7.620 – 8.255)
N8 Package
8-Lead PDIP (Narrow 0.300)
(LTC DWG # 05-08-1510)
0.045 – 0.065
(1.143 – 1.651)
0.130 ± 0.005
(3.302 ± 0.127)
0.400*
(10.160)
MAX
87 6
5
0.009 – 0.015
(0.229 – 0.381)
0.065
(1.651)
TYP
+0.035
0.325 –0.015
( )8.255
+0.889
–0.381
0.100 ± 0.010
(2.540 ± 0.254)
*THESE DIMENSIONS DO NOT INCLUDE MOLD FLASH OR PROTRUSIONS.
MOLD FLASH OR PROTRUSIONS SHALL NOT EXCEED 0.010 INCH (0.254mm)
0.125
(3.175) 0.020
MIN (0.508)
MIN
0.018 ± 0.003
(0.457 ± 0.076)
0.255 ± 0.015*
(6.477 ± 0.381)
12
34
N8 1197
Information furnished by Linear Technology Corporation is believed to be accurate and reliable.
However, no responsibility is assumed for its use. Linear Technology Corporation makes no represen-
tation that the interconnection of its circuits as described herein will not infringe on existing patent rights.
11
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| Páginas | Total 12 Páginas | |
| PDF Descargar | [ Datasheet LT1920CN8.PDF ] | |
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