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Linear Technology Electronic Components Datasheet

LT1997-3 Datasheet

Wide Voltage Range Gain Selectable Amplifier

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FEATURES
nn Pin Configurable as a Difference Amplifier, Inverting
Amplifier or Noninverting Amplifier
nn 91dB Minimum DC CMRR (Gain = 1)
nn 65dB AC CMRR (at 100kHz, Gain = 1)
nn 0.006% (60ppm) Maximum Gain Error (Gain = 1)
nn 1ppm/°C Maximum Gain Error Drift
nn 2ppm Maximum Gain Nonlinearity
nn ±160V Common Mode Voltage Range
nn Wide Supply Voltage Range: 3.3V to 50V
nn Rail-to-Rail Output
nn 350µA Supply Current
nn 60µV Maximum Op Amp Offset Voltage
nn 1.1MHz –3dB Bandwidth (Gain = 1)
nn Low-Power Shutdown: 20µA
nn Space-Saving MSOP and DFN Packages
APPLICATIONS
nn High Side or Low Side Current Sensing
nn Bidirectional Wide Common Mode Range Current
Sensing
nn High Voltage to Low Voltage Level Translation
nn Industrial Data-Acquisition Front-Ends
nn Replacement for Isolation Circuits
nn Differential to Single-Ended Conversion
LT1997-3
Precision, Wide Voltage
Range Gain Selectable
Amplifier
DESCRIPTION
The LT®1997-3 combines a precision operational amplifier
with highly-matched resistors to form a one-chip solution
for accurately amplifying voltages. Gains from –13 to +14
with accuracy of 0.006% (60ppm) can be achieved using
no external components. The LT1997-3 is particularly well
suited for use as a difference amplifier, where the excellent
resistor matching results in a common mode rejection
ratio of greater than 91dB.
The amplifier features a 60μV maximum input offset voltage
and a –3dB bandwidth of 1.1MHz (Gain = 1). The LT1997-3
operates from any supply voltage from 3.3V to 50V and
draws only 350μA supply current. The output typically
swings to within 100mV of either supply rail.
The resistors maintain their excellent matching over
temperature; the matching temperature coefficient is
guaranteed less than 1ppm/°C. The resistors are extremely
linear with voltage, resulting in a gain nonlinearity of less
than 2ppm.
The LT1997-3 is fully specified at 5V and ±15V supplies
and from –40°C to 125°C. The device is available in space
saving 16-lead MSOP and 4mm × 4mm DFN14 packages.
All registered trademarks and trademarks are the property of their respective owners.
TYPICAL APPLICATION
VSOURCE = –28V TO 26.5V
Gain = 1 Difference Amplifier
15V
–INA –INB –INC
V+ LT1997-3
2.5k
7.5k 22.5k
RSENSE
22.5k
RC
1Ω 22.5k
+ OUT VOUT = ±1mV/mA
LOAD
7.5k
2.5k
45k REF2
45k REF1
+INA +INB +INC
SHDN V–
–15V
19973 TA01a
Document Feedback
For more information www.analog.com
Typical Distribution of CMRR (G = 1)
1200
1000
800
VS = ±15V
VCM = –28V TO +26.5V
4625 UNITS
FROM 3 RUNS
600
400
200
0
–30
–20 –10 0 10
CMRR (µV/V = ppm)
20 30
19973 TA01b
Rev A
1


Linear Technology Electronic Components Datasheet

LT1997-3 Datasheet

Wide Voltage Range Gain Selectable Amplifier

No Preview Available !

LT1997-3
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltages (V+ to V).........................................60V
+INA, –INA (Note 2).......................................... V±160V
+INB, –INB, +INC, –INC
(Note 2)............................... (V+ 80V) to (V– 0.3V)
REF, REF1, REF2..................... (V+ 60V) to (V– 0.3V)
SHDN...................................... (V+ + 0.3V) to (V– 0.3V)
Output Current (Continuous) (Note 6).....................50mA
Output Short-Circuit Duration
(Note 3)...........................................Thermally Limited
Temperature Range (Notes 4, 5)
LT1997I-3.................................................–40 to 85°C
LT1997H-3.............................................. –40 to 125°C
Maximum Junction Temperature........................... 150°C
Storage Temperature Range.......................–65 to 150°C
MSOP Lead Temperature (Soldering, 10 sec)......... 300°C
PIN CONFIGURATION
TOP VIEW
+INA 1
14 –INA
+INB 3
12 –INB
NC 4 V15– 11 NC
+INC 5
10 –INC
SHDN 6
9 V+
REF 7
8 OUT
DF PACKAGE
14(12)-LEAD (4mm × 4mm) PLASTIC DFN
TJMAX
EXPOSED PAD
= 150°C,
(PIN 15)
θISJAV=,4M5°UCS/TWB,EθSJCO=LD3E°RC/EWD
TO
PCB
+INA 1
TOP VIEW
16 –INA
+INB 3
14 –INB
+INC 5
REF1 6
REVF2–
7
8
12
11
–VI+NC
10 SHDN
9 OUT
MS PACKAGE
VARIATION: MS16 (12)
16-LEAD PLASTIC MSOP
TJMAX = 150°C, θJA = 130°C/W
ORDER INFORMATION http://www.linear.com/product/LT1997-3#orderinfo
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED
TEMPERATURE RANGE
LT1997IDF-3#PBF
LT1997IDF-3#TRPBF
19973
14-Lead (4mm × 4mm) Plastic DFN
–40°C to 85°C
LT1997HDF-3#PBF
LT1997HDF-3#TRPBF 19973
14-Lead (4mm × 4mm) Plastic DFN
–40°C to 125°C
LT1997IMS-3#PBF
LT1997IMS-3#TRPBF 19973
16-Lead Plastic MSOP
–40°C to 85°C
LT1997HMS-3#PBF
LT1997HMS-3#TRPBF 19973
16-Lead Plastic MSOP
–40°C to 125°C
*The temperature grade is identified by a label on the shipping container. Consult ADI Marketing for parts specified with wider operating temperature ranges.
Parts ending with PBF are RoHS and WEEE compliant.
For more information on lead free part marking, go to: http://www.linear.com/leadfree/
For more information on tape and reel specifications, go to: http://www.linear.com/tapeandreel/.
Rev A
2 For more information www.analog.com


Part Number LT1997-3
Description Wide Voltage Range Gain Selectable Amplifier
Maker Linear Technology
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LT1997-3 Datasheet PDF






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