INA317IDGKT [TI]

微功耗 (50µA)、零漂移（75µV 失调电压、0.3µV/°C）、精密 RRO 仪表放大器 | DGK | 8 | -40 to 125;


型号：	INA317IDGKT
厂家：	TEXAS INSTRUMENTS
描述：	微功耗 (50µA)、零漂移（75µV 失调电压、0.3µV/°C）、精密 RRO 仪表放大器 \| DGK \| 8 \| -40 to 125 放大器仪表光电二极管仪表放大器
文件：	总32页 (文件大小：956K)
中文：	中文翻译
下载：	下载PDF数据表文档文件

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INA317

ZHCSH47 –NOVEMBER 2017

INA317 微功耗 (50µA)、零漂移、轨至轨输出仪表放大器

1 特性

3 说明

•

低失调电压：75µV（最大值），G ≥ 100

低温漂：0.3µV/°C，G ≥ 100

INA317 是一款具备出色精度的低功耗精密仪表放大

器。INA317 采用 3 种多功能运算放大器设计，尺寸小

巧，功耗较低，适用于各种便携式应用。

•

低噪声：50nV/√Hz，G ≥ 100

高共模抑制比 (CMRR)：100dB（最小值），G ≥

单个外部电阻器可根据行业标准增益等式 G = 1 +

(100 kΩ / R_G) 的定义，设置 1 至 1000 范围内的任意

增益。

•

低输入偏置电流：200pA（最大值）

电源范围：1.8V 至 5.5V

该仪表放大器提供低失调电压（75µV，G ≥ 100）、出

色的失调电压漂移

输入电压：(V–) 0.1V 至 (V+) –0.1V

电压范围：(V–) 0.05V 至 (V+) –0.05V

低静态电流：50µA

（0.3 µV/°C，G ≥ 100）和高共模抑制（G ≥ 10 时为

100dB）。INA317 采用低至 1.8V (±0.9V) 电压和

50µA 静态电流的电源供电，因而该器件适用于电池供

电系统。INA317 器件采用自动校准技术确保广泛工业

温度范围内的精度，可提供可扩展到直流的低噪声密度

(50nV/√Hz)。

工作温度范围：-40°C 至 +125°C

已过滤射频干扰 (RFI) 的输入

8 引脚 VSSOP 封装

2 应用

•

桥式放大器

INA317 采用 8 引脚 VSSOP 表面贴装式封装，额定温

度范围为 T_A= –40°C 至 +125°C。

心电图 (ECG) 放大器

压力传感器

器件信息⁽¹⁾

医疗仪表

器件型号

INA317

封装

VSSOP (8)

封装尺寸（标称值）

便携式仪表

3.00mm × 3.00mm

衡器

(1) 如需了解所有可用封装，请参阅数据表末尾的可订购产品附

录。

热电偶放大器

电阻式温度检测器 (RTD) 传感器放大器

数据采集

简化原理图

V+

V_IN-

RFI Filtered Inputs

150 kΩ

A₁

RFI Filtered Inputs

50 kΩ

V_OUT

A₃

R_G

50 kΩ

RFI Filtered Inputs

150 kΩ

REF

A₂

V_IN+

INA317

100 kΩ

V-

G = 1 +

R_G

An IMPORTANT NOTICE at the end of this data sheet addresses availability, warranty, changes, use in safety-critical applications,

intellectual property matters and other important disclaimers. PRODUCTION DATA.

English Data Sheet: SBOS896

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

7.4 Device Functional Modes........................................ 13

Application and Implementation ........................ 14

8.1 Application Information............................................ 14

8.2 Typical Application ................................................. 14

Power Supply Recommendations...................... 19

特性.......................................................................... 1

应用.......................................................................... 1

说明.......................................................................... 1

修订历史记录 ........................................................... 2

Pin Configuration and Functions......................... 3

Specifications......................................................... 4

6.1 Absolute Maximum Ratings ...................................... 4

6.2 ESD Ratings.............................................................. 4

6.3 Recommended Operating Conditions....................... 4

6.4 Thermal Information ................................................. 4

6.5 Electrical Characteristics........................................... 5

6.6 Typical Characteristics.............................................. 7

Detailed Description ............................................ 13

7.1 Overview ................................................................. 13

7.2 Functional Block Diagram ....................................... 13

7.3 Feature Description................................................. 13

10 Layout................................................................... 20

10.1 Layout Guidelines ................................................. 20

10.2 Layout Example .................................................... 21

11 器件和文档支持 ..................................................... 22

11.1 器件支持................................................................ 22

11.2 文档支持................................................................ 23

11.3 商标....................................................................... 23

11.4 静电放电警告......................................................... 24

11.5 Glossary................................................................ 24

12 机械、封装和可订购信息....................................... 25

4 修订历史记录

注：之前版本的页码可能与当前版本有所不同。

日期

修订版本

说明

2017 年 11 月

初始发行版

INA317

www.ti.com.cn

ZHCSH47 –NOVEMBER 2017

5 Pin Configuration and Functions

DGK Package

8-Pin VSSOP

Top View

R_G

V_IN-

V_IN+

V-

R_G

V+

V_OUT

REF

Pin Functions

I/O

DESCRIPTION

NAME

REF

R_G

NO.

Reference input. This pin must be driven by low impedance or connected to ground.

1, 8

—

Gain setting pins. For gains greater than 1, place a gain resistor between pins 1 and 8.

V₊

Positive supply

Negative supply

Positive input

Negative input

Output

V_–

V_IN+

V_IN–

V_OUT

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

6 Specifications

6.1 Absolute Maximum Ratings

over operating free-air temperature range (unless otherwise noted)

(1)

MIN

MAX

UNIT

Supply voltage

Analog input voltage⁽²⁾

Output short-circuit⁽³⁾

Operating temperature, T_A

Junction temperature, T_J

Storage temperature, T_stg

(V–) – 0.3

(V+) + 0.3

Continuous

–40

150

°C

–65

(1) Stresses beyond those listed under Absolute Maximum Ratings may cause permanent damage to the device. These are stress ratings

only, which do not imply functional operation of the device at these or any other conditions beyond those indicated under Recommended

Operating Conditions. Exposure to absolute-maximum-rated conditions for extended periods may affect device reliability.

(2) Input pins are diode-clamped to the power-supply rails. Input signals that can swing more than 0.3 V beyond the supply rails must be

current limited to 10 mA or less.

(3) Short-circuit to ground.

6.2 ESD Ratings

VALUE

±4000

±1000

±200

UNIT

Human-body model (HBM), per ANSI/ESDA/JEDEC JS-001⁽¹⁾

Charged-device model (CDM), per JEDEC specification JESD22-C101⁽²⁾

Machine model (MM)

V_(ESD)Electrostatic discharge

(1) JEDEC document JEP155 states that 500-V HBM allows safe manufacturing with a standard ESD control process.

(2) JEDEC document JEP157 states that 250-V CDM allows safe manufacturing with a standard ESD control process.

6.3 Recommended Operating Conditions

over operating free-air temperature range (unless otherwise noted)

MIN

MAX

5.5

UNIT

Supply voltage

1.8

Specified temperature

–40

125

°C

6.4 Thermal Information

INA317

DGK (VSSOP)

8 PINS

169.5

THERMAL METRIC⁽¹⁾

UNIT

R_θJA

Junction-to-ambient thermal resistance

Junction-to-case (top) thermal resistance

Junction-to-board thermal resistance

°C/W

R_θJC(top)

R_θJB

62.7

90.3

ψ_JT

Junction-to-top characterization parameter

Junction-to-board characterization parameter

Junction-to-case (bottom) thermal resistance

7.6

ψ_JB

88.7

R_θJC(bot)

—

(1) For more information about traditional and new thermal metrics, see the Semiconductor and IC Package Thermal Metrics application

report.

INA317

www.ti.com.cn

ZHCSH47 –NOVEMBER 2017

6.5 Electrical Characteristics

for V_S= 1.8 V to 5.5 V at T_A= 25°C, R_L= 10 kΩ, V_REF= V_S/ 2, and G = 1 (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

INPUT⁽¹⁾

V_OSI

Offset voltage, RTI⁽²⁾

±10 ±25 / G

±75 ±75 / G

±0.3 ±0.5 / G

±5 ±15 / G

μV

vs temperature, T_A= –40°C to 125°C

vs power supply,1.8 V ≤ V_S≤ 5.5 V

Long-term stability

μV/°C

μV/V

PSR

±1 ±5 / G

(3)

See

Turnon time to specified V_OSI

Impedance

T_A= –40°C to 125°C

See Typical Characteristics

Z_IN

Differential

100 || 3

GΩ || pF

Z_IN

Common-mode

V_CM

Common-mode voltage range

V_O= 0 V

(V–) + 0.1

(V+) – 0.1

DC to 60 Hz

V_CM= (V–) + 0.1 V

to (V+) – 0.1 V, G = 1

110

115

V_CM= (V–) + 0.1 V

to (V+) – 0.1 V, G = 10

100

CMR

Common-mode rejection

V_CM= (V–) + 0.1 V

to (V+) – 0.1 V, G = 100,

V_CM= (V–) + 0.1 V

to (V+) – 0.1 V, G = 1000

INPUT BIAS CURRENT

Input bias current

±70

±50

±200

pA/°C

I_B

vs temperature

T_A= –40°C to 125°C

See 图 26

See 图 28

Input offset current

I_OS

vs temperature

pA/°C

INPUT VOLTAGE NOISE

G = 100, R_S= 0 Ω, f = 10 Hz

G = 100, R_S= 0 Ω, f = 100 Hz

G = 100, R_S= 0 Ω, f = 1 kHz

G = 100, R_S= 0 Ω, f = 0.1 Hz to 10 Hz

f = 10 Hz

nV/√Hz

μV_PP

e_NI

Input voltage noise

Input current noise

100

fA/√Hz

pA_PP

i_N

f = 0.1 Hz to 10 Hz

GAIN

Gain equation

Range of gain

1 + (100 kΩ / R_G)

V/V

1000

V_S= 5.5 V, (V–) + 100 mV

≤ V_O≤ (V+) – 100 mV

G = 1

±0.01%

±0.05%

±0.07%

±0.25%

±1

±0.1%

±0.25%

±0.5%

±5

Gain error

G = 10

G = 100

G = 1000

Gain vs temperature, G = 1

Gain vs temperature, G > 1⁽⁴⁾

T_A= –40°C to 125°C

ppm/°C

±15

±50

V_S= 5.5 V, (V–) + 100 mV

≤ V_O≤ (V+) – 100 mV

Gain nonlinearity

Gain nonlinearity, G = 1 to 1000

R_L= 10 kΩ

ppm

OUTPUT

Output voltage swing from rail

Capacitive load drive

V_S= 5.5 V

R_L= 10 kΩ

See 图 29

500

(1) Total V_OS, referred-to-input = (V_OSI) + (V_OSO/ G)

(2) RTI = Referred-to-input

(3) 300-hour life test at 150°C demonstrated randomly distributed variation of approximately 1 μV

(4) Does not include effects of external resistor R_G

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

Electrical Characteristics (continued)

for V_S= 1.8 V to 5.5 V at T_A= 25°C, R_L= 10 kΩ, V_REF= V_S/ 2, and G = 1 (unless otherwise noted)

PARAMETER

TEST CONDITIONS

MIN

TYP

MAX

UNIT

I_SC

Short-circuit current

Continuous to common

–40, 5

FREQUENCY RESPONSE

G = 1

150

kHz

G = 10

Bandwidth, –3 dB

G = 100

3.5

350

0.16

0.05

G = 1000

V_S= 5 V, V_O= 4-V step, G = 1

V_S= 5 V, V_O= 4-V step, G = 100

V_STEP= 4 V, G = 1

V_STEP= 4 V, G = 100

V_STEP= 4 V, G = 1

V_STEP= 4 V, G = 100

50% overdrive

V/μs

μs

t_S

Slew rate

Settling time to 0.01%

400

μs

t_S

Settling time to 0.001%

Overload recovery

500

μs

REFERENCE INPUT

R_IN

300

kΩ

Voltage range

POWER SUPPLY

V–

V+

Single voltage range

Dual voltage range

V_IN= V_S/ 2

1.8

5.5

±2.75

Voltage range

±0.9

μA

I_Q

Quiescent current vs temperature

T_A= –40°C to 125°C

TEMPERATURE RANGE

Specified temperature range

Operating temperature range

–40

125

150

°C

INA317

www.ti.com.cn

ZHCSH47 –NOVEMBER 2017

6.6 Typical Characteristics

at T_A= 25°C, V_S= 5 V, R_L= 10 kΩ, V_REF= midsupply, and G = 1, (unless otherwise noted)

Input Offset Voltage (µV)

Input Voltage Offset Drift (µV/°C)

V_S= 5.5 V

T_A= –40°C to +125°C

图 1. Input Offset Voltage

图 2. Input Voltage Offset Drift

Output Offset Voltage (µV)

Output Voltage Offset Drift (µV/°C)

V_S= 5.5 V

T_A= –40°C to +125°C

图 3. Output Offset Voltage

图 4. Output Voltage Offset Drift

-5

V_S= 1.8 V

V_S= 5 V

-10

-15

-20

-25

Time (1 s/div)

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

V_CM(V)

Gain = 1

图 6. 0.1-Hz to 10-Hz Noise

图 5. Offset Voltage vs Common-Mode Voltage

INA317

ZHCSH47 –NOVEMBER 2017

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Typical Characteristics (接下页)

at T_A= 25°C, V_S= 5 V, R_L= 10 kΩ, V_REF= midsupply, and G = 1, (unless otherwise noted)

1000

100

Output Noise

100

Current Noise

Input Noise

(Output Noise)

Total Input-Referred Noise =

(Input Noise)²

0.1

100

10k

Time (1 s/div)

Frequency (Hz)

Gain = 100

图 8. Spectral Noise Density

图 7. 0.1-Hz to 10-Hz Noise

0.012

0.008

0.004

G = 1000

G = 100

G = 10

G = 1

-0.004

-0.008

-0.012

Time (25 µs/div)

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0 5.5

Gain = 1

V_OUT(V)

V_S= ±2.75 V

图 10. Large Signal Response

图 9. Nonlinearity Error

Time (100 µs/div)

Time (10 µs/div)

Gain = 100

Gain = 1

图 11. Large-Signal Step Response

图 12. Small-Signal Step Response

INA317

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ZHCSH47 –NOVEMBER 2017

Typical Characteristics (接下页)

at T_A= 25°C, V_S= 5 V, R_L= 10 kΩ, V_REF= midsupply, and G = 1, (unless otherwise noted)

10000

1000

0.001%

100

0.01%

0.1%

100

1000

Time (100 µs/div)

Gain (V/V)

Gain = 100

图 14. Settling Time vs Gain

图 13. Small-Signal Step Response

G = 1000

Supply

G = 100

G = 10

V_OUT

G = 1

-20

-40

-60

Time (50 µs/div)

100

10k

100k

Gain = 1

Frequency (Hz)

图 15. Start-Up Settling Time

图 16. Gain vs Frequency

V_S

2.75 V

0.ꢀ V

G = 1

G = 10

-2

-4

-6

-8

-10

G = 100,

G = 1000

-50

-25

100

125

150

Temperature (°C)

CMRR (µV/V)

V_S= 5.5 V

图 17. Common-Mode Rejection Ratio

图 18. Common-Mode Rejection Ratio vs Temperature

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

Typical Characteristics (接下页)

at T_A= 25°C, V_S= 5 V, R_L= 10 kΩ, V_REF= midsupply, and G = 1, (unless otherwise noted)

160

140

120

100

2.5

2.0

G = 1000

G = 100

1.0

G = 1

-1.0

G = 10

-2.0

2.5

100

Frequency (Hz)

10k

100k

-2.5 -2.0

-1.0

1.0

2.0 2.5

Output Voltage (V)

V_REF= 0

V_S= ±2.5 V

All gains

图 19. Common-Mode Rejection Ratio vs Frequency

图 20. Typical Common-Mode Range vs Output Voltage

0.9

0.7

0.5

0.3

0.1

-0.1

-0.3

-0.5

-0.7

-0.9

-0.9 -0.7 -0.5 -0.3 -0.1 0.1 0.3

Output Voltage (V)

0.5

0.7

0.9

Output Voltage (V)

V_S= 5 V

V_REF= 0

All gains

V_S= ±0.9 V

V_REF= 0

All gains

图 21. Typical Common-Mode Range vs Output Voltage

图 22. Typical Common-Mode Range vs Output Voltage

1.8

160

1.6

1.4

1.2

1.0

0.8

0.6

0.4

0.2

140

G = 1000

120

100

G = 100

G = 10

G = 1

0.2

0.4

0.5

0.8

1.0 1.2

1.4

1.6

1.8

10k

100k

100

Output Voltage (V)

Frequency (Hz)

V_S= 1.8 V

V_REF= 0

图 23. Typical Common-Mode Range vs Output Voltage

图 24. Positive Power-Supply Rejection Ratio

INA317

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ZHCSH47 –NOVEMBER 2017

Typical Characteristics (接下页)

at T_A= 25°C, V_S= 5 V, R_L= 10 kΩ, V_REF= midsupply, and G = 1, (unless otherwise noted)

160

140

120

100

1200

1000

800

600

400

200

+I_B

-I_B

G = 100

G = 1000

G = 10

0ꢀ ꢁ V

= 2ꢀ75 V

G = 1

-200

-20

0.1

100

10k

100k

-50

-25

100

125

150

Frequency (Hz)

Temperature (°C)

V_S= 5 V

图 25. Negative Power-Supply Rejection Ratio

图 26. Input Bias Current vs Temperature

250

200

150

100

200

180

160

140

120

100

2ꢀ75 V

0ꢀ. V

-50

-100

-50

-25

100

125

150

0.5 1.0 1.5 2.0 2.5 3.0 3.5 4.0 4.5 5.0

Temperature (°C)

V_CM(V)

V_S= 5 V

V_S= 1.8 V

图 28. Input Offset Current vs Temperature

图 27. Input Bias Current vs Common-Mode Voltage

(V+)

V_S

2.75 V

0.ꢀ V

(V+) - 0.25

(V+) - 0.50

(V+) - 0.75

(V+) - 1.00

(V+) - 1.25

(V+) - 1.50

(V+) - 1.75

V_S= 5 V

(V-) + 1.75

(V-) + 1.50

(V-) + 1.25

(V-) + 1.00

(V-) + 0.75

(V-) + 0.50

(V-) + 0.25

(V-)

V_S= 1.8 V

125°C

25°C

-40°C

-50

-25

100

125

150

I_OUT(mA)

Temperature (°C)

图 30. Quiescent Current vs Temperature

图 29. Output Voltage Swing vs Output Current

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

Typical Characteristics (接下页)

at T_A= 25°C, V_S= 5 V, R_L= 10 kΩ, V_REF= midsupply, and G = 1, (unless otherwise noted)

V_S= 5 V

V_S= 1.8 V

1.0

2.0

3.0

4.0

5.0

V_CM(V)

图 31. Quiescent Current vs Common-Mode Voltage

INA317

www.ti.com.cn

ZHCSH47 –NOVEMBER 2017

7 Detailed Description

7.1 Overview

The INA317 is a monolithic instrumentation amplifier (INA) based on the precision zero-drift OPA333 (operational

amplifier) core. The INA317 integrates laser-trimmed resistors to ensure excellent common-mode rejection and

low gain error. The combination of the zero-drift amplifier core and the precision resistors allows this device to

achieve outstanding DC precision and is designed for 3.3-V and 5-V industrial applications.

7.2 Functional Block Diagram

V+

V_IN-

RFI Filtered Inputs

150 kΩ

A₁

RFI Filtered Inputs

50 kΩ

V_OUT

A₃

R_G

50 kΩ

RFI Filtered Inputs

150 kΩ

REF

A₂

V_IN+

INA317

100 kΩ

V-

G = 1 +

R_G

7.3 Feature Description

The INA317 is a low-power, zero-drift instrumentation amplifier that offers accuracy. The versatile three-

operational-amplifier design and small size makes the amplifier designed for a wide range of applications. Zero-

drift chopper circuitry provides DC specifications. A single external resistor sets any gain from 1 to 10,000. The

INA317 is laser trimmed for high common-mode rejection (100 dB at G ≥ 100). Typically, the INA317 operates

with power supplies as low as 1.8 V and quiescent current of 50 µA.

7.4 Device Functional Modes

7.4.1 Internal Offset Correction

INA317 internal operational amplifiers use an autocalibration technique with a time-continuous 350-kHz

operational amplifier in the signal path. The amplifier is zero-corrected every 8 µs using a proprietary technique.

Upon power up, the amplifier requires approximately 100 µs to achieve specified VOS accuracy. This design has

no aliasing or flicker noise.

7.4.2 Input Common-Mode Range

The linear input voltage range of the input circuitry of the INA317 is from approximately 0.1 V below the positive

supply voltage to 0.1 V above the negative supply. However, as a differential input voltage causes the output

voltage to increase, the output voltage swing of amplifiers A1 and A2 limits the linear input range. As a result, the

linear common-mode input range is related to the output voltage of the complete amplifier. This behavior

depends on supply voltage; see 图 20.

Input overload conditions can produce an output voltage that appears normal. For example, if an input overload

condition drives the input amplifiers to the respective positive output swing limit, the difference voltage measured

by the output amplifier is approximately zero. The output of the INA317 is approximately 0 V even though the

inputs are overloaded.

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

8 Application and Implementation

注

Information in the following applications sections is not part of the TI component

specification, and TI does not warrant its accuracy or completeness. TI’s customers are

responsible for determining suitability of components for their purposes. Customers should

validate and test their design implementation to confirm system functionality.

8.1 Application Information

The INA317 measures small differential voltage with high common-mode voltage that develops between the

noninverting and inverting input. The high input impedance makes the INA317 designed for a wide range of

applications. The ability to set the reference pin to adjust the functionality of the output signal offers additional

flexibility that is practical for multiple configurations.

8.2 Typical Application

图 32 shows the basic connections required for operation of the INA317 device. Good layout practice mandates

the use of bypass capacitors placed close to the device pins as shown.

The output of the INA317 device is referred to the output reference (REF) pin, which is normally grounded. This

connection must be low-impedance to ensure good common-mode rejection. Although 15 Ω or less of stray

resistance is tolerated while maintaining specified CMRR, small stray resistances of tens of ohms in series with

the REF pin causes noticeable degradation in CMRR.

V+

0.1 mF

RFI Filter

V_IN-

150 kΩ

A₁

V_O= G ´ (V_IN+- V_IN-

)

100 kΩ

G = 1 +

R_G

50 kΩ

R_G

A₃

50 kΩ

V_O

Load

RFI Filter

150 kΩ

A₂

V_IN+

Ref

INA317

0.1 mF

V-

Also drawn in simplified form:

V_IN-

R_G

V_O

INA317

Ref

V_IN+

图 32. Basic Connections

INA317

www.ti.com.cn

ZHCSH47 –NOVEMBER 2017

Typical Application (接下页)

8.2.1 Design Requirements

The device is configured to monitor the input differential voltage when the gain of the external resistor R_Gsets

the input signal. The output signal references to the REF pin. The most common application is where the output

is referenced to ground when no input signal is present by connecting the REF pin to ground. When the input

signal increases, the output voltage at the OUT pin increases.

8.2.2 Detailed Design Procedure

8.2.2.1 Setting the Gain

A single external resistor (R_G) that is connected between pins 1 and 8 sets the gain of the INA317. The value of

R_Gis selected according to 公式 1:

G = 1 + (100 kΩ / R_G)

(1)

表 1 lists several commonly-used gains and resistor values. The 100 kΩ in 公式 1 is a result of the sum of the

two internal feedback resistors (A₁and A₂.) These on-chip resistors are laser trimmed to accurate absolute

values. The accuracy and temperature coefficient of these resistors are included in the gain accuracy and drift

specifications of the INA317 device.

The stability and temperature drift of the external gain setting resistor (R_G) also affects gain. The contribution of

R_Gto gain accuracy and drift is inferred from the gain in公式 1. Low resistor values required for high gain make

wiring resistance important. Sockets add to the wiring resistance and contribute additional gain error (possibly an

unstable gain error) in gains of approximately 100 or greater. To ensure stability, avoid parasitic capacitance of

more than a few picofarads at the R_Gconnections. Careful matching of any parasitics on R_Gpins maintains

optimal CMRR over frequency.

表 1. Commonly-Used Gains and Resistor Values

DESIRED GAIN

R_G(Ω)

NC⁽¹⁾

100 k

25 k

NEAREST 1% R_G(Ω)

100 k

24.9 k

11 k

5.23 k

2.05

1 k

11.1 k

5.26 k

2.04 k

1.01 k

502.5

200.4

100.1

100

200

500

1000

499

200

100

(1) NC denotes no connection. When using the SPICE model, the simulation does not converge unless a

resistor is connected to the R_Gpins; use a large resistor value.

8.2.2.2 Internal Offset Correction

The INA317 device internal operational amplifiers use an autocalibration technique with a time-continuous 350-

kHz operational amplifier in the signal path. The amplifier is zero-corrected every 8 µs using a proprietary

technique. At power-up, the amplifier requires approximately 100 µs to achieve specified V_OSaccuracy. This

design has no aliasing or flicker noise.

8.2.2.3 Offset Trimming

Most applications require no external offset adjustment. However, apply a voltage to the REF pin to make

adjustments if necessary. 图 33 shows an optional circuit for trimming the output offset voltage. The voltage

applied to REF pin is added at the output. The operational amplifier buffer provides low impedance at the REF

pin to preserve good common-mode rejection.

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

V_IN-

V+

R_G

V_O

INA317

Ref

100 mA

½ REF200

V_IN+

100 ꢀ

OPA333

±10 mV

Adjustment Range

10 kꢀ

100 mA

½ REF200

V-

图 33. Optional Trimming of Output Offset Voltage

8.2.2.4 Noise Performance

The autocalibration technique used by the INA317 device results in reduced low-frequency noise, typically only

50 nV/√Hz (G = 100). The spectral noise density is shown in 图 8. Low-frequency noise of the INA317 device is

approximately 1 µV_PPmeasured from 0.1 Hz to 10 Hz (G = 100).

8.2.2.5 Input Bias Current Return Path

The input impedance of the INA317 device is extremely high(approximately 100 GΩ.) However, a path must be

provided for the input bias current of the inputs. This input bias current is typically ±70 pA. High-input impedance

means that this input bias current changes very little with varying input voltage.

For proper operation, input circuitry must provide a path for the input bias current. 图 34 shows various

provisions for an input bias current path. Without a bias current path, the inputs float to a potential that exceeds

the common-mode range of the INA317 device, and the input amplifiers saturate. If the differential source

resistance is low, the bias current return path connects to one input (see the thermocouple example in 图 34).

With higher source impedance, using two equal resistors provides a balanced input with possible advantages of

lower input offset voltage as a result of bias current and better high-frequency common-mode rejection.

INA317

www.ti.com.cn

ZHCSH47 –NOVEMBER 2017

Microphone,

Hydrophone,

and more

INA317

47 kΩ

Thermocouple

INA317

10 kΩ

INA317

图 34. Providing an Input Common-Mode Current Path

8.2.2.6 Input Common-Mode Range

The linear input voltage range of the input circuitry of the INA317 device is from approximately 0.1 V below the

positive supply voltage to 0.1 V above the negative supply. As a differential input voltage causes the output

voltage to increase, however, the linear input range is limited by the output voltage swing of amplifiers A₁and A₂.

The linear common-mode input range is related to the output voltage of the complete amplifier. This behavior

depends on supply voltage(see 图 20 to 图 23 in the Typical Characteristics section.)

Input overload conditions can produce an output voltage that appears normal. For example, if an input overload

condition drives both input amplifiers to the respective positive output swing limit, the difference voltage

measured by the output amplifier is near zero. The output of the INA317 is near 0 V even though both inputs are

overloaded.

8.2.2.7 Operating Voltage

The INA317 operates over a power-supply range of 1.8 V to 5.5 V (±0.9 V to ±2.75 V). Supply voltages higher

than 7 V (absolute maximum) can permanently damage the device. Parameters that vary over supply voltage or

temperature are shown in the Typical Characteristics section of this data sheet.

8.2.2.8 Low Voltage Operation

The INA317 device operates on power supplies as low as ±0.9 V. Most parameters vary only slightly throughout

this supply voltage range; see the Typical Characteristics section. Operation at very low supply voltage requires

careful attention to ensure that the input voltages remain within the linear range. Voltage swing requirements of

internal nodes limit the input common-mode range with low power supply voltage. 图 20 to 图 23 show the range

of linear operation for various supply voltages and gains.

8.2.2.9 Single-Supply Operation

The INA317 device can be used on single power supplies of 1.8 V to 5.5 V. 图 35 shows a basic single-supply

circuit. The output REF pin is connected to midsupply. Zero differential input voltage demands an output voltage

of midsupply. Actual output voltage swing is limited to approximately 50 mV more than ground when the load is

referred to ground as shown. 图 29 shows how the output voltage swing varies with output current.

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

With single-supply operation, V_IN+and V_IN–must be 0.1 V more than ground for linear operation. For instance,

the inverting input cannot connect to ground to measure a voltage that is connected to the noninverting input.

To show the issues affecting low voltage operation, see 图 35. 图 35 shows the INA317 device operating from a

single 3-V supply. A resistor in series with the low side of the bridge ensures that the bridge output voltage is

within the common-mode range of the amplifier inputs.

+3 V

3 V

2 V - DV

R_G

V_O

INA317

300 Ω

Ref

1.5 V

2 V + DV

150 Ω

(1)

R₁

(1) R₁creates proper common-mode voltage only for low-voltage operation; see Single-Supply Operation.

图 35. Single-Supply Bridge Amplifier

8.2.2.10 Input Protection

The input pins of the INA317 device are protected with internal diodes that are connected to the power-supply

rails. These diodes clamp the applied signal to prevent the signal from damaging the input circuitry. If the input

signal voltage exceeds the power supplies by more than 0.3 V, the input signal current must be limited to less

than 10 mA to protect the internal clamp diodes. Limit the current with a series input resistor. Some signal

sources are inherently current limited and do not require limiting resistors.

INA317

www.ti.com.cn

ZHCSH47 –NOVEMBER 2017

8.2.3 Application Curves

Time (25 µs/div)

Time (100 µs/div)

Gain = 1

Gain = 100

图 36. Large Signal Response

图 37. Large-Signal Step Response

Time (10 µs/div)

Time (100 µs/div)

Gain = 1

Gain = 100

图 38. Small-Signal Step Response

图 39. Small-Signal Step Response

9 Power Supply Recommendations

The minimum power supply voltage for INA317 is 1.8 V and the maximum power supply voltage is 5.5 V. For

optimum performance, 3.3 V to 5 V is recommended. TI recommends adding a bypass capacitor at the input to

compensate for the layout and power supply source impedance.

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

10 Layout

10.1 Layout Guidelines

TI recommends paying attention to good layout practices. Keep traces short and use a printed-circuit-board

(PCB) ground plane with surface-mount components placed as close to the device pins as possible. Place a 0.1-

µF bypass capacitor as close as possible the supply pins. Apply these guidelines throughout the analog circuit to

improve performance and reduce electromagnetic interference (EMI) susceptibility.

Instrumentation amplifiers vary in the susceptibility to radio-frequency interference (RFI). RFI is identified as a

variation in offset voltage or DC signal levels with changes in the interfering RF signal. The INA317 device is

designed to minimize susceptibility to RFI by incorporating passive RC filters with an 8-MHz corner frequency at

the V_IN+and V_IN–inputs. As a result, the INA317 device demonstrates low sensitivity compared to previous

generation devices. However, strong RF fields can cause varied offset levels and may require additional

shielding.

INA317

www.ti.com.cn

ZHCSH47 –NOVEMBER 2017

10.2 Layout Example

+IN

-IN

INA317

OUT

Ground plane

removed at gain

-V

resistor to minimize

parasitic capacitance

Use ground pours for

shielding the input

signal pairs

GND

œIN

+IN

œIN

+IN

-VS

+VS

OUT

REF

Input traces routed

adjacent to each other

OUT

Low-impedance

connection for

reference terminal

GND

Place bypass

capacitors as close to

IC as possible

-V

图 40. INA317 Layout

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

11 器件和文档支持

11.1 器件支持

11.1.1 开发支持

11.1.1.1 TINA-TI（免费下载软件）

针对 INA317 使用基于 SPICE 的 TINA-TI 模拟仿真程序

TINA 是一款简单、功能强大且易于使用的电路仿真程序，此程序基于 SPICE 引擎。TINA-TI 是 TINA 软件的一款

免费全功能版本，除了一系列无源和有源模型外，此版本软件还预先载入了一个宏模型库。它提供所有传统的

SPICE 直流 (DC)、瞬态和频域分析以及其他设计功能。

TINA-TI 可从 Analog eLab Design Center（模拟电子实验室设计中心）免费下载，它提供全面的后续处理能力，

使得用户能够以多种方式形成结果。

虚拟仪器为用户提供选择输入波形和探测电路节点、电压和波形的功能，从而创建一个动态的快速入门工具。

图 41 和图 42 给出了适用于 INA317 器件的 TINA-TI 电路示例，可用于开发、修改和评估特定应用的电路设

计。。下面给出了这些仿真文件的下载链接。

注

必须安装 TINA 软件（从 DesignSoft）或者 TINA-TI 软件后才能使用这些文件。请从 TINA-

TI 文件夹中下载免费的 TINA-TI 软件。

VoA1

Half of matched

monolithic dual

NPN transistors

(example: MMDT3904)

Vout

U1INA317

V-

R8 10k

Vdiff

Out

Input I10n

Ref

VM1

V+

U1 OPA335

U5 OPA369

Optional buffer for driving

SAR converters with

sampling systems of ³ 33 kHz.

Half of matched

monolithic dual

NPN transistors

(example: MMDT3904)

VoA2

V1 5

Rset 2.5M

uCVref/2 2.5

U6 OPA369

(1) 如下链接会打开 TI 对数放大器网页：对数放大器产品主页

(2) 未显示对数晶体管的温度补偿。

(3) 对于单片对数放大器（例如 LOG112 或 LOG114），请参阅注 1 中的链接。

图 41. 便携式电池供电类系统的低功耗对数函数电路

（例如血糖仪）

要下载包含此电路 TINA-TI 仿真文件的压缩文件，请点击如下链接：对数电路。

INA317

www.ti.com.cn

ZHCSH47 –NOVEMBER 2017

器件支持 (接下页)

R₁

2 kꢀ

RWa

3 ꢀ

EMU21 RTD3

Pt100 RTD

OPA333

RWb

3 ꢀ

VT+

RTD+

U1 INA317

Out

VT 25

3 V

V-

VT-

RTD-

V_DIFF

MSP430

PGA112

R_GAIN

Mon+ Mon-

Ref

100 kꢀ

V+

RWc

4 ꢀ

R_ZERO

Temp (°C)

(Volts = °C)

100 kꢀ

V_REF+

3 V

VRTD

RWd

3 ꢀ

RTD Resistance

(Volts = Ohms)

I_REF1

I_REF2

3 V

V_REF

3 V

V_REF

U1 REF3212

Use BF861A

T3 BF256A

3 V

Use BF861A

OUTF

OUTS

T1 BF256A

OPA3331 OPA333

GNDF GNDS

OPA333

3 V

470 n⁷F

V4 3

R_SET2

R_SET1

2.5 kꢀ

RWa、RWb、RWc 和 RWd 用于仿真线电阻。包含这些电阻以展示 4 线感应技术对线路失配的抗扰性。这种方法假定使用 4 线 RTD。

图 42. 带有可编程增益采集系统的适用于 PT100 RTD 的 4 线、3V 调节器

要下载包含此电路 TINA-TI 仿真文件的压缩文件，请点击如下链接：PT100 RTD。

11.2 文档支持

11.2.1 相关文档

请参阅如下相关文档：

•

精密、低噪声、轨至轨输出，36V，零漂移运算放大器

50µV VOS、0.25µV/°C、35µA CMOS 运算放大器零漂移系列

4ppm/°C、100µA、SOT23-6 系列电压基准

《电路板布局布线技巧》

11.3 商标

All trademarks are the property of their respective owners.

INA317

ZHCSH47 –NOVEMBER 2017

www.ti.com.cn

11.4 静电放电警告

这些装置包含有限的内置 ESD 保护。存储或装卸时，应将导线一起截短或将装置放置于导电泡棉中，以防止 MOS 门极遭受静电损

伤。

11.5 Glossary

SLYZ022 — TI Glossary.

This glossary lists and explains terms, acronyms, and definitions.

INA317

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ZHCSH47 –NOVEMBER 2017

12 机械、封装和可订购信息

以下页面包含机械、封装和可订购信息。这些信息是指定器件的最新可用数据。数据如有变更，恕不另行通知和修

订此文档。如欲获取此产品说明书的浏览器版本，请参阅左侧的导航。

PACKAGE OPTION ADDENDUM

www.ti.com

17-May-2023

PACKAGING INFORMATION

Orderable Device

Status Package Type Package Pins Package

Eco Plan

Lead finish/

Ball material

MSL Peak Temp

Op Temp (°C)

Device Marking

Samples

Drawing

Qty

(1)

(2)

(3)

(4/5)

(6)

INA317IDGKR

INA317IDGKT

ACTIVE

VSSOP

DGK

2500 RoHS & Green

250 RoHS & Green

NIPDAUAG | SN

Level-2-260C-1 YEAR

-40 to 125

I317

Samples

NIPDAUAG | SN

⁽¹⁾The marketing status values are defined as follows:

ACTIVE: Product device recommended for new designs.

LIFEBUY: TI has announced that the device will be discontinued, and a lifetime-buy period is in effect.

NRND: Not recommended for new designs. Device is in production to support existing customers, but TI does not recommend using this part in a new design.

PREVIEW: Device has been announced but is not in production. Samples may or may not be available.

OBSOLETE: TI has discontinued the production of the device.

⁽²⁾RoHS: TI defines "RoHS" to mean semiconductor products that are compliant with the current EU RoHS requirements for all 10 RoHS substances, including the requirement that RoHS substance

do not exceed 0.1% by weight in homogeneous materials. Where designed to be soldered at high temperatures, "RoHS" products are suitable for use in specified lead-free processes. TI may

reference these types of products as "Pb-Free".

RoHS Exempt: TI defines "RoHS Exempt" to mean products that contain lead but are compliant with EU RoHS pursuant to a specific EU RoHS exemption.

Green: TI defines "Green" to mean the content of Chlorine (Cl) and Bromine (Br) based flame retardants meet JS709B low halogen requirements of <=1000ppm threshold. Antimony trioxide based

flame retardants must also meet the <=1000ppm threshold requirement.

⁽³⁾MSL, Peak Temp. - The Moisture Sensitivity Level rating according to the JEDEC industry standard classifications, and peak solder temperature.

⁽⁴⁾There may be additional marking, which relates to the logo, the lot trace code information, or the environmental category on the device.

⁽⁵⁾Multiple Device Markings will be inside parentheses. Only one Device Marking contained in parentheses and separated by a "~" will appear on a device. If a line is indented then it is a continuation

of the previous line and the two combined represent the entire Device Marking for that device.

(6)

Lead finish/Ball material - Orderable Devices may have multiple material finish options. Finish options are separated by a vertical ruled line. Lead finish/Ball material values may wrap to two

lines if the finish value exceeds the maximum column width.

Important Information and Disclaimer:The information provided on this page represents TI's knowledge and belief as of the date that it is provided. TI bases its knowledge and belief on information

provided by third parties, and makes no representation or warranty as to the accuracy of such information. Efforts are underway to better integrate information from third parties. TI has taken and

continues to take reasonable steps to provide representative and accurate information but may not have conducted destructive testing or chemical analysis on incoming materials and chemicals.

TI and TI suppliers consider certain information to be proprietary, and thus CAS numbers and other limited information may not be available for release.

In no event shall TI's liability arising out of such information exceed the total purchase price of the TI part(s) at issue in this document sold by TI to Customer on an annual basis.

Addendum-Page 1

PACKAGE OPTION ADDENDUM

www.ti.com

17-May-2023

Addendum-Page 2

PACKAGE MATERIALS INFORMATION

www.ti.com

24-May-2023

TAPE AND REEL INFORMATION

REEL DIMENSIONS

TAPE DIMENSIONS

Reel

Diameter

Cavity

A0 Dimension designed to accommodate the component width

B0 Dimension designed to accommodate the component length

K0 Dimension designed to accommodate the component thickness

Overall width of the carrier tape

P1 Pitch between successive cavity centers

Reel Width (W1)

QUADRANT ASSIGNMENTS FOR PIN 1 ORIENTATION IN TAPE

Sprocket Holes

Q1 Q2

Q3 Q4

Q1 Q2

Q3 Q4

User Direction of Feed

Pocket Quadrants

*All dimensions are nominal

Device

Package Package Pins

Type Drawing

SPQ

Reel

Pin1

Diameter Width (mm) (mm) (mm) (mm) (mm) Quadrant

(mm) W1 (mm)

INA317IDGKR

INA317IDGKT

VSSOP

DGK

2500

250

330.0

12.4

5.3

3.4

1.4

8.0

12.0

250

Pack Materials-Page 1

PACKAGE MATERIALS INFORMATION

www.ti.com

24-May-2023

TAPE AND REEL BOX DIMENSIONS

Width (mm)

*All dimensions are nominal

Device

Package Type Package Drawing Pins

SPQ

Length (mm) Width (mm) Height (mm)

INA317IDGKR

INA317IDGKT

VSSOP

DGK

2500

250

366.0

364.0

50.0

250

Pack Materials-Page 2

重要声明和免责声明

TI“按原样”提供技术和可靠性数据（包括数据表）、设计资源（包括参考设计）、应用或其他设计建议、网络工具、安全信息和其他资源，

不保证没有瑕疵且不做出任何明示或暗示的担保，包括但不限于对适销性、某特定用途方面的适用性或不侵犯任何第三方知识产权的暗示担

保。

这些资源可供使用 TI 产品进行设计的熟练开发人员使用。您将自行承担以下全部责任：(1) 针对您的应用选择合适的 TI 产品，(2) 设计、验

证并测试您的应用，(3) 确保您的应用满足相应标准以及任何其他功能安全、信息安全、监管或其他要求。

这些资源如有变更，恕不另行通知。TI 授权您仅可将这些资源用于研发本资源所述的 TI 产品的应用。严禁对这些资源进行其他复制或展示。

您无权使用任何其他 TI 知识产权或任何第三方知识产权。您应全额赔偿因在这些资源的使用中对 TI 及其代表造成的任何索赔、损害、成

本、损失和债务，TI 对此概不负责。

TI 提供的产品受 TI 的销售条款或 ti.com 上其他适用条款/TI 产品随附的其他适用条款的约束。TI 提供这些资源并不会扩展或以其他方式更改

TI 针对 TI 产品发布的适用的担保或担保免责声明。

TI 反对并拒绝您可能提出的任何其他或不同的条款。IMPORTANT NOTICE

邮寄地址：Texas Instruments, Post Office Box 655303, Dallas, Texas 75265

INA317IDGKT [TI]

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