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Analog Devices Semiconductor Electronic Components Datasheet

LT1997-2 Datasheet

Gain Selectable Funnel Amplifier

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FEATURES
nn Precision Attenuation: Gain = 0.1, 0.2, 0.25
nn ±255V Common Mode Voltage Range
nn 105dB Minimum CMRR (Gain = 0.1)
nn 0.006% (60ppm) Maximum Gain Error
nn 1ppm/°C Maximum Gain Error Drift
nn 2ppm Maximum Gain Nonlinearity
nn Wide Supply Voltage Range: 3.3V to 50V
nn Rail-to-Rail Output
nn 350µA Supply Current
nn 80µV Maximum Op Amp Offset Voltage
nn 1MHz –3dB Bandwidth (Gain = 0.1)
nn Low Power Shutdown: 20µA
nn Space-Saving MSOP and DFN Packages
APPLICATIONS
nn High Voltage to Low Voltage Level Translation
nn ADC Driver
nn Bidirectional Wide Common Mode Range Voltage
and Current Sensing
nn Industrial Data-Acquisition Front-Ends
nn Replacement for Isolation Circuits
nn Differential to Single-Ended Conversion
All registered trademarks and trademarks are the property of their respective owners.
LT1997-2
Precision, Wide Voltage
Range, Gain Selectable
Funnel Amplifier
DESCRIPTION
The LT®1997-2 is an attenuating (funnel) difference ampli-
fier that can be used to translate large differential signals to
the low voltage range compatible with ADCs. It combines
a precision operational amplifier with highly-matched re-
sistors to form a one-chip solution to attenuate and level
shift voltages accurately using no external components.
It comes with three standard pin-selectable gain options
(0.1, 0.2 and 0.25), which can be further combined to
form gains from 0.0455 to 0.55 (attenuations of 1.82 to
22) with accuracy of 0.006% (60ppm). The LT1997-2 also
works across a very wide input common-mode voltage
range (±255V), enabling robust operation in demanding
industrial environments. Its excellent resistor matching
results in a common mode rejection ratio of greater than
105dB.
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 LT1997-2 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.
TYPICAL APPLICATION
Interfacing a 20VP-P Ground-Referenced Input Signal to a 5V ADC
+10V
–10V –INA –INB –INC
5V
V+ LT1997-2
100k
125k 25k
4.5V
250k
250k
125k
100k
OUT
+
50k REF2
50k REF1
0.5V 200Ω
8nF
+INA +INB +INC
SHDN V–
5.5V TO 40V
5V
IN OUT
LT6657-5
GND
2.5V 1.8V TO 5V
IN+ VDD
0VDD
LTC2364-16
IN
REF
GND
47µF
19972 TA01a
Document Feedback
For more information www.analog.com
LT1997-2 Driving LTC2364-16,
ADC, fIN = 1kHz, 32768-Point FFT
0 VS = 5V
–20
VOUT = 4VP-P
HD2 = –104.3dBc
HD3 = –104.4dBc
–40 SFDR = 104.3dB
THD = –101dB
–60
SNR = 91.8dB
SINAD = 89.5dB
–80
–100
–120
–140
0
25 50 75 100 125
FREQUENCY (kHz)
19972 TA01b
Rev 0
1


Analog Devices Semiconductor Electronic Components Datasheet

LT1997-2 Datasheet

Gain Selectable Funnel Amplifier

No Preview Available !

LT1997-2
ABSOLUTE MAXIMUM RATINGS
(Note 1)
Supply Voltages (V+ to V).........................................60V
+INA, –INA, +INB, –INB,
+INC, –INC (Note 2)..........................................V±270V
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-2.................................................–40 to 85°C
LT1997H-2.............................................. –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
NC 4
+INC 5
SHDN 6
REF 7
12 –INB
V15– 11 NC
10 –INC
9 V+
8 OUT
DF PACKAGE
14(12)-LEAD (4mm × 4mm) PLASTIC DFN
TJMAX
EXPOSED PAD
= 150°C,
(PIN 15)
θISJAV=,4M5U°CS/TWB,EθSJCOL=D3E°RCE/WD
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
LEAD FREE FINISH
TAPE AND REEL
PART MARKING*
PACKAGE DESCRIPTION
SPECIFIED
TEMPERATURE RANGE
LT1997IDF-2#PBF
LT1997IDF-2#TRPBF
19972
14-Lead (4mm × 4mm) Plastic DFN
–40°C to 85°C
LT1997HDF-2#PBF
LT1997HDF-2#TRPBF 19972
14-Lead (4mm × 4mm) Plastic DFN
–40°C to 125°C
LT1997IMS-2#PBF
LT1997IMS-2#TRPBF 19972
16-Lead Plastic MSOP
–40°C to 85°C
LT1997HMS-2#PBF
LT1997HMS-2#TRPBF 19972
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.
Tape and reel specifications. Some packages are available in 500 unit reels through designated sales channels with #TRMPBF suffix.
Rev 0
2 For more information www.analog.com


Part Number LT1997-2
Description Gain Selectable Funnel Amplifier
Maker Analog Devices
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LT1997-2 Datasheet PDF






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