Datasheet > AD8277BRZ-R7

AD8277BRZ-R7

更新时间： 2024-01-30 05:25:58

品牌	Logo	应用领域
亚德诺 - ADI		放大器
页数	文件大小	规格书
20页	537K
描述
Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifiers

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技术参数
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AD8277BRZ-R7 技术参数

是否无铅：	含铅	是否Rohs认证：	符合
生命周期：	Active	零件包装代码：	SOIC
包装说明：	SOP, SOP14,.25	针数：	14
Reach Compliance Code：	compliant	ECCN代码：	EAR99
HTS代码：	8542.33.00.01	风险等级：	2.36
放大器类型：	INSTRUMENTATION AMPLIFIER	标称带宽 (3dB)：	0.55 MHz
最小共模抑制比：	86 dB	最大输入失调电压：	200 µV
JESD-30 代码：	R-PDSO-G14	JESD-609代码：	e3
长度：	8.65 mm	湿度敏感等级：	1
负供电电压上限：	-18 V	标称负供电电压 (Vsup)：	-5 V
最大非线性：	0.0005%	功能数量：	2
端子数量：	14	最高工作温度：	85 °C
最低工作温度：	-40 °C	封装主体材料：	PLASTIC/EPOXY
封装代码：	SOP	封装等效代码：	SOP14,.25
封装形状：	RECTANGULAR	封装形式：	SMALL OUTLINE
峰值回流温度（摄氏度）：	260	电源：	+-2/+-18/2/36 V
认证状态：	Not Qualified	座面最大高度：	1.75 mm
标称压摆率：	1.1 V/us	子类别：	Instrumentation Amplifier
最大压摆率：	0.25 mA	供电电压上限：	18 V
标称供电电压 (Vsup)：	5 V	表面贴装：	YES
温度等级：	INDUSTRIAL	端子面层：	Tin (Sn)
端子形式：	GULL WING	端子节距：	1.27 mm
端子位置：	DUAL	处于峰值回流温度下的最长时间：	30
宽度：	3.9 mm	Base Number Matches：	1

AD8277BRZ-R7 数据手册

AD8276/AD8277

THEORY OF OPERATION

AC Performance

CIRCUIT INFORMATION

Component sizes and trace lengths are much smaller in an IC

than on a PCB, so the corresponding parasitic elements are also

smaller. This results in better ac performance of the AD8276/

AD8277. For example, the positive and negative input terminals

of the AD8276/AD8277 op amps are intentionally not pinned

out. By not connecting these nodes to the traces on the PCB, the

capacitance remains low, resulting in improved loop stability

and excellent common-mode rejection over frequency.

Each channel of the AD8276/AD8277 consists of a low power, low

noise op amp and four laser-trimmed on-chip resistors. These

resistors can be externally connected to make a variety of amplifier

configurations, including difference, noninverting, and inverting

configurations. Taking advantage of the integrated resistors of

the AD8276/AD8277 provides the designer with several benefits

over a discrete design, including smaller size, lower cost, and

better ac and dc performance.

+VS

DRIVING THE AD8276/AD8277

AD8276

40kΩ

Care should be taken to drive the AD8276/AD8277 with a low

impedance source: for example, another amplifier. Source

resistance of even a few kilohms (kꢀ) can unbalance the resistor

ratios and, therefore, significantly degrade the gain accuracy and

common-mode rejection of the AD8276/AD8277. Because all

configurations present several kilohms of input resistance, the

AD8276/AD8277 do not require a high current drive from the

source and so are easy to drive.

40kΩ

IN–

IN+

SENSE

OUT

40kΩ

REF

–VS

INPUT VOLTAGE RANGE

Figure 38. Functional Block Diagram

The AD8276/AD8277 are able to measure input voltages beyond

the supply rails. The internal resistors divide down the voltage

before it reaches the internal op amp and provide protection to

the op amp inputs. Figure 39 shows an example of how the

voltage division works in a difference amplifier configuration.

For the AD8276/AD8277 to measure correctly, the input

voltages at the input nodes of the internal op amp must stay

below 1.5 V of the positive supply rail and can exceed the

negative supply rail by 0.1 V. Refer to the Power Supplies section

for more details.

DC Performance

Much of the dc performance of op amp circuits depends on the

accuracy of the surrounding resistors. Using superposition to

analyze a typical difference amplifier circuit, as is shown in

Figure 39, the output voltage is found to be

⎛

⎜

⎝

⎞

⎟

⎠

R1 + R2

⎛

⎜

⎝

⎞

⎟

⎠

⎛

⎜

⎝

⎞

⎟

⎠

V_OUT= V_{IN +}

1 +

− V

IN −

This equation demonstrates that the gain accuracy and common-

mode rejection ratio of the AD8276/AD8277 is determined

primarily by the matching of resistor ratios. Even a 0.1% mismatch

in one resistor degrades the CMRR to 66 dB for a G = 1 difference

amplifier.

R1 + R2

)

IN+

IN–

IN+

The difference amplifier output voltage equation can be reduced to

R1 + R2

V_OUT

(

V_{IN +}− V_I

)

IN+

N −

Figure 39. Voltage Division in the Difference Amplifier Configuration

as long as the following ratio of the resistors is tightly matched:

The AD8276/AD8277 have integrated ESD diodes at the inputs

that provide overvoltage protection. This feature simplifies

system design by eliminating the need for additional external

protection circuitry, and enables a more robust system.

R2 R4

R1 R3

The resistors on the AD8276/AD8277 are laser trimmed to match

accurately. As a result, the AD8276/AD8277 provide superior

performance over a discrete solution, enabling better CMRR,

gain accuracy, and gain drift, even over a wide temperature range.

The voltages at any of the inputs of the parts can safely range

from +V_S− 40 V up to −V_S+ 40 V. For example, on 10 V

supplies, input voltages can go as high as 30 V. Care should be

taken to not exceed the +V_S− 40 V to −V_S+ 40 V input limits

to avoid risking damage to the parts.

Rev. A | Page 14 of 20

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中文翻译

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AD8277BRZ-R7 替代型号

型号	品牌	替代类型	描述	数据表
AD8277ARZ-RL	ADI	完全替代	Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifiers
AD8277ARZ	ADI	类似代替	Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifiers

与AD8277BRZ-R7相关器件

型号	品牌	获取价格	描述	数据表
AD8277BRZ-RL	ADI	获取价格	Low Power, Wide Supply Range, Low Cost Unity-Gain Difference Amplifiers
AD8278	ADI	获取价格	Low Power, Wide Supply Range, Low Cost Differ
AD8278ARMZ	ADI	获取价格	Low Power, Wide Supply Range, Low Cost Differ
AD8278ARMZ-R7	ADI	获取价格	Low Power, Wide Supply Range, Low Cost Differ
AD8278ARMZ-RL	ADI	获取价格	Low Power, Wide Supply Range, Low Cost Differ
AD8278ARZ	ADI	获取价格	Low Power, Wide Supply Range, Low Cost Differ
AD8278ARZ-R7	ADI	获取价格	Low Power, Wide Supply Range, Low Cost Differ
AD8278ARZ-RL	ADI	获取价格	Low Power, Wide Supply Range, Low Cost Differ
AD8278BRMZ	ADI	获取价格	Low Power, Wide Supply Range, Low Cost Differ
AD8278BRMZ-R7	ADI	获取价格	Low Power, Wide Supply Range, Low Cost Differ

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