Datasheet > LT1997-3

LT1997-3

更新时间： 2023-12-20 18:46:27

品牌	Logo	应用领域
亚德诺 - ADI		放大器
页数	文件大小	规格书
38页	3203K
描述
精准、宽电压范围增益可选放大器

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LT1997-3 数据手册

LT1997-3

Precision, Wide Voltage

Range Gain Selectable

Amplifier

FEATURES

DESCRIPTION

TheLT^®1997-3combinesaprecisionoperationalamplifier

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

noexternalcomponents. TheLT1997-3isparticularlywell

suited for use as a difference amplifier, where the excellent

resistor matching results in a common mode rejection

ratio of greater than 91dB.

Pin Configurable as a Difference Amplifier, Inverting

Amplifier or Noninverting Amplifier

91dB Minimum DC CMRR (Gain = 1)

65dB AC CMRR (at 100kHz, Gain = 1)

0.006% (60ppm) Maximum Gain Error (Gain = 1)

1ppm/°C Maximum Gain Error Drift

2ppm Maximum Gain Nonlinearity

160V Common Mode Voltage Range

Wide Supply Voltage Range: 3.3V to 50V

Theamplifierfeaturesa60μVmaximuminputoffsetvoltage

anda–3dBbandwidthof1.1MHz(Gain=1).TheLT1997-3

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.

Rail-to-Rail Output

350µA Supply Current

60µV Maximum Op Amp Offset Voltage

1.1MHz –3dB Bandwidth (Gain = 1)

Low-Power Shutdown: 20µA

The resistors maintain their excellent matching over

temperature; the matching temperature coefficient is

guaranteedlessthan1ppm/°C.Theresistorsareextremely

linear with voltage, resulting in a gain nonlinearity of less

than 2ppm.

Space-Saving MSOP and DFN Packages

APPLICATIONS

High Side or Low Side Current Sensing

Bidirectional Wide Common Mode Range Current

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.

Sensing

High Voltage to Low Voltage Level Translation

Industrial Data-Acquisition Front-Ends

Replacement for Isolation Circuits

All registered trademarks and trademarks are the property of their respective owners.

Differential to Single-Ended Conversion

TYPICAL APPLICATION

Typical Distribution of CMRR (G = 1)

Gain = 1 Difference Amplifier

ꢀꢁꢂꢂ

= –28V TO 26.5V

15V

SOURCE

ꢀ

ꢂ ꢃꢄꢀ

ꢁ

ꢀ

ꢅꢆ

ꢂ ꢇꢈꢉꢀ ꢊꢋ ꢌꢈꢍꢎꢄꢀ

–INA –INB –INC

LT1997-3

ꢀꢁꢁꢁ

ꢀꢁꢁ

ꢀ

ꢏꢍꢈꢄ ꢐꢑꢒꢊꢁ

2.5k

7.5k

ꢓRꢋꢆ ꢔ Rꢐꢑꢁ

22.5k

–

OUT

SENSE

OUT

= 1ꢀV/ꢀA

1Ω

7.5k

2.5k

45k

REF2

REF1

LOAD

ꢀꢁꢂ

ꢀ

ꢀꢁ

–

ꢀꢁRR ꢂꢃꢄꢅꢄ ꢆ ꢇꢇꢈꢉ

+INA +INB +INC

SHDN

ꢀꢁꢁꢂꢃ ꢄAꢅꢀꢆ

19973 TA01a

–15V

Rev A

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