参数资料
| 型号： | AD8271ARMZ-R7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 10/20页 |
| 文件大小： | 0K |
| 描述： | IC AMP PGA 15MHZ LDIST 10MSOP |
| 设计资源： | High Speed Instrumentation Amplifier Using AD8271 and ADA4627-1 (CN0122) |
| 特色产品： | AD8271 - Precision Programmable-Gain Difference Amplifier |
| 标准包装： | 1 |
| 放大器类型： | 可编程增益 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 30 V/µs |
| 增益带宽积： | 15MHz |
| 电流 - 输入偏压： | 500nA |
| 电压 - 输入偏移： | 300µV |
| 电流 - 电源： | 2.3mA |
| 电流 - 输出 / 通道： | 100mA |
| 电压 - 电源，单路/双路(±)： | 5 V ~ 36 V，±2.5 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 10-TFSOP，10-MSOP（0.118"，3.00mm 宽） |
| 供应商设备封装： | 10-MSOP |
| 包装： | 标准包装 |
| 产品目录页面： | 773 (CN2011-ZH PDF) |
| 其它名称： | AD8271ARMZ-R7DKR |
AD8271
Rev. 0 | Page 18 of 20
Many signal gains have more than one configuration choice, which
allows freedom in choosing the op amp closed-loop gain. In
general, for designs that need to be stable with a large capacitive
load on the output, choose a configuration with high loop gain.
Otherwise, choose a configuration with low loop gain, because
these configurations typically have lower noise, lower offset,
and higher bandwidth.
The AD8271 Specifications section and Typical Performance
Characteristics section show the performance of the part primarily
when it is in the difference amplifier configuration. To estimate
the performance of the part in a single-ended configuration, refer
to the difference amplifier configuration with the corresponding
closed-loop gain (see Table 10).
Table 10. Closed-Loop Gain of the Difference Amplifiers
Difference Amplifier Gain
Closed-Loop Gain
0.5
1.5
1
2
3
Gain of 1 Configuration
The AD8271 is designed to be stable for loop gains of 1.5 and
greater. Because a typical voltage follower configuration has
a loop gain of 1, it may be unstable. Several stable configurations
for gain of 1 are listed in Table 9.
KELVIN MEASUREMENT
In the case where the output load is located remotely or at
a distance from the AD8271, as shown in Figure 51, wire
resistance can actually cause significant errors at the load.
07
36
3
-14
9
–IN
10k
10k
10k
10k
+IN
RW
(WIRE RESISTANCE)
RL
1k
Figure 51. Wire Resistance Causes Errors at Load Voltage
Since the output of the AD8271 is not internally tied to any of
the feedback resistors, Kelvin type measurements are possible
because the op amp output and feedback can both be connected
closer to the load (Figure 52). The Kelvin sensing on the feedback
minimizes error at the load caused by voltage drops across the
wire resistance. This technique is most effective in reducing errors
for loads less than 10 kΩ. As the load resistance increases, the
error due to the wire resistance becomes less significant.
Because it adds the sense wire resistance to the feedback resistor, a
trade-off of the Kelvin connection is that it can degrade common-
mode rejection, especially over temperature. For sense wire
resistance less than 1 Ω, it is typically not an issue. If common-
mode performance is critical, two amplifier stages can be used:
the first stage removes common-mode interference, and the
second stage performs the Kelvin drive.
10k
Rw
SENSE
FORCE
07
36
3
-15
0
–IN
10k
10k
10k
+IN
RL
1k
Figure 52. Connecting Both the Output and Feedback at the Load Minimizes
Error Due to Wire Resistance
INSTRUMENTATION AMPLIFIER
The AD8271 can be used as a building block for high performance
instrumentation amplifiers. For example, Figure 53 shows how
to build an ultralow noise instrumentation amplifier using the
therefore, the output is
()
8271
2
1
AD
G
Fx
IN
OUT
G
R
V
+
=
+
–IN
+IN
10k
10k
10k
10k
REF
AD8599
A2
AD8599
A2
RG
20
RF1
RF2
2k
AD8271
OUT
2k
VS = ±15V
07
363
-15
3
Figure 53.Ultralow Noise Instrumentation Amplifier Using AD8599
Configured for Gain = 201
For optimal noise performance, it is desirable to have a high
gain at the input stage using low value gain-setting resistors, as
shown in this particular example. With less than 2 nV/√Hz
input-referred noise (see Figure 54) at ~10 mA supply current,
the AD8271 and AD8599 combination offers an in-amp with a
fine balance of critical specifications: a gain bandwidth product
of 10 MHz, low bias current, low offset drift, high CMRR, and
high slew rate.
0
1.0
2.0
3.0
4.0
5.0
6.0
7.0
8.0
9.0
10.0
1
10
100
1k
10k
100k
V
O
L
T
AG
E
NO
IS
E
S
P
E
CT
RA
L
DE
NS
IT
Y
(
n
V
/√
Hz
)
FREQUENCY (Hz)
07
36
3-
1
51
G = 201
BANDWIDTH
LIMIT
Figure 54. Ultralow Noise In-Amp Voltage Noise Spectral Density vs.
Frequency, Referred to Input
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD8271ARMZ-RL | 功能描述:IC AMP PGA 15MHZ LDIST 10MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1,000 系列:- 放大器类型:电压反馈 电路数:4 输出类型:满摆幅 转换速率:33 V/µs 增益带宽积:20MHz -3db带宽:30MHz 电流 - 输入偏压:2nA 电压 - 输入偏移:3000µV 电流 - 电源:2.5mA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):4.5 V ~ 16.5 V，±2.25 V ~ 8.25 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:带卷 (TR) |
| AD8271BRMZ | 功能描述:IC AMP PGA 15MHZ LDIST 10MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:1 系列:- 放大器类型:通用 电路数:4 输出类型:满摆幅 转换速率:0.028 V/µs 增益带宽积:105kHz -3db带宽:- 电流 - 输入偏压:3nA 电压 - 输入偏移:100µV 电流 - 电源:3.3µA 电流 - 输出 / 通道:12mA 电压 - 电源，单路/双路(±):2.7 V ~ 12 V，±1.35 V ~ 6 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-TSSOP（0.173"，4.40mm 宽） 供应商设备封装:14-TSSOP 包装:剪切带 (CT) 其它名称:OP481GRUZ-REELCT |
| AD8271BRMZ-R7 | 功能描述:IC AMP PGA 15MHZ LDIST 10MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:LinCMOS™ 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.05 V/µs 增益带宽积:110kHz -3db带宽:- 电流 - 输入偏压:0.7pA 电压 - 输入偏移:210µV 电流 - 电源:57µA 电流 - 输出 / 通道:30mA 电压 - 电源，单路/双路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:14-SOIC（0.154"，3.90mm 宽） 供应商设备封装:14-SOIC 包装:管件 产品目录页面:865 (CN2011-ZH PDF) 其它名称:296-1834296-1834-5 |
| AD8271BRMZ-RL | 功能描述:IC AMP PGA 15MHZ LDIST 10MSOP RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:50 系列:- 放大器类型:通用 电路数:2 输出类型:满摆幅 转换速率:1.8 V/µs 增益带宽积:6.5MHz -3db带宽:4.5MHz 电流 - 输入偏压:5nA 电压 - 输入偏移:100µV 电流 - 电源:65µA 电流 - 输出 / 通道:35mA 电压 - 电源，单路/双路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:10-TFSOP，10-MSOP（0.118"，3.00mm 宽） 供应商设备封装:10-MSOP 包装:管件 |
| AD8273 | 制造商:AD 制造商全称:Analog Devices 功能描述:Dual-Channel, Audio Difference Amplifier |
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