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参数资料
| 型号： | AD8221BR-REEL7 |
| 厂商： | ANALOG DEVICES INC |
| 元件分类： | 运动控制电子 |
| 英文描述： | Single Supply, Rail-to-Rail, Low Cost Instrumentation Amplifier |
| 中文描述： | INSTRUMENTATION AMPLIFIER, 25 uV OFFSET-MAX, 0.825 MHz BAND WIDTH, PDSO8 |
| 封装： | MS-012AA, SOIC-8 |
| 文件页数： | 14/20页 |
| 文件大小： | 1283K |
| 代理商： | AD8221BR-REEL7 |
AD8221
GAIN SELECTION
Placing a resistor across the R
G
terminals will set the AD8221’s
gain, which may be calculated by referring to Table 3 or by
using the gain equation
Rev. A | Page 14 of 20
1
kΩ
4
G
49
=
R
G
Table 3. Gains Achieved Using 1% Resistors
1% Std Table Value of R
G
()
49.9 k
12.4 k
5.49 k
2.61 k
1.00 k
499
249
100
49.9
The AD8221 defaults to G = 1 when no gain resistor is used.
Gain accuracy is determined by the absolute tolerance of R
G
.
The TC of the external gain resistor will increase the gain drift
of the instrumentation amplifier. Gain error and gain drift are
kept to a minimum when the gain resistor is not used.
Calculated Gain
1.990
4.984
9.998
19.93
50.40
100.0
199.4
495.0
991.0
LAYOUT
Careful board layout maximizes system performance. Traces
from the gain setting resistor to the R
G
pins should be kept as
short as possible to minimize parasitic inductance. To ensure
the most accurate output, the trace from the REF pin should
either be connected to the AD8221’s local ground as shown in
Figure 47, or connected to a voltage that is referenced to the
AD8221’s local ground.
Common-Mode Rejection
One benefit of the AD8221’s high CMRR over frequency is that
it has greater immunity to disturbances such as line noise and
its associated harmonics than do typical in-amps. These,
typically, have CMRR fall-off at 200 Hz; common-mode filters
are often used to compensate for this shortcoming. The AD8221
is able to reject CMRR over a greater frequency range, reducing
the need for filtering.
A well implemented layout helps to maintain the AD8221’s high
CMRR over frequency. Input source impedance and capacitance
should be closely matched. In addition, source resistance and
capacitance should be placed as close to the inputs as
permissible.
Grounding
The AD8221’s output voltage is developed with respect to the
potential on the reference terminal. Care should be taken to tie
REF to the appropriate “local ground.”
In mixed-signal environments, low level analog signals need to
be isolated from the noisy digital environment. Many ADCs
have separate analog and digital ground pins. Although it is
convenient to tie both grounds to a single ground plane, the
current traveling through the ground wires and PC board may
cause hundreds of millivolts of error. Therefore, separate analog
and digital ground returns should be used to minimize the
current flow from sensitive points to the system ground. An
example layout is shown in Figure 44 and Figure 45.
0
Figure 44.Top Layer of the AD8221-EVAL
0
Figure 45.Bottom Layer of the AD8221-EVAL
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相关代理商/技术参数 |
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| AD8221BRZ | 功能描述:IC AMP INSTRUMENT PREC HP 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:2,500 系列:- 放大器类型:通用 电路数:4 输出类型:- 转换速率:0.6 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:45nA 电压 - 输入偏移:2000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:40mA 电压 - 电源，单路/双路(±):3 V ~ 32 V，±1.5 V ~ 16 V 工作温度:0°C ~ 70°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:带卷 (TR) 其它名称:LM324ADTBR2G-NDLM324ADTBR2GOSTR |
| AD8221BRZ-R7 | 功能描述:IC AMP INST PREC LN 18MA 8SOIC 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:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| AD8221BRZ-RL | 功能描述:IC AMP INST PREC LN 18MA 8SOIC 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:J-FET 电路数:2 输出类型:- 转换速率:13 V/µs 增益带宽积:3MHz -3db带宽:- 电流 - 输入偏压:65pA 电压 - 输入偏移:3000µV 电流 - 电源:1.4mA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):7 V ~ 36 V，±3.5 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:通孔 封装/外壳:8-DIP（0.300"，7.62mm） 供应商设备封装:8-PDIP 包装:管件 |
| AD8221-EVAL | 制造商:AD 制造商全称:Analog Devices 功能描述:Precision Instrumentation Amplifier |
| AD8221TRMZ-EP | 功能描述:IC OPAMP INSTR 825KHZ 制造商:analog devices inc. 系列:- 包装:管件 零件状态:在售 放大器类型:仪表 电路数:1 输出类型:- 压摆率:2 V/μs -3db 带宽:825kHz 电流 - 输入偏置:2nA 电压 - 输入失调:70μV 电流 - 电源:900μA 电流 - 输出/通道:18mA 电压 - 电源，单/双（±）:±2.3 V ~ 18 V 工作温度:-55°C ~ 125°C 安装类型:表面贴装 封装/外壳:8-TSSOP，8-MSOP（0.118"，3.00mm 宽） 供应商器件封装:8-MSOP 标准包装:50 |
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