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| 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： | 13/20页 |
| 文件大小： | 1283K |
| 代理商： | AD8221BR-REEL7 |
AD8221
THEORY OF OPERATION
Rev. A | Page 13 of 20
C1
C2
+V
S
+V
S
+IN
–IN
–V
S
–V
S
10k
10k
10k
400
400
10k
REF
OUTPUT
I
B
COMPENSATION
I
B
COMPENSATION
+V
S
–V
S
+V
S
–V
S
+V
S
V
B
I
I
R1
24.7k
24.7k
R
G
Q1
R2
Q2
–V
S
+V
S
–V
S
A2
A1
A3
0
Figure 42. Simplified Schematic
The AD8221 is a monolithic instrumentation amplifier based
on the classic 3-op amp topology. Input transistors Q1 and Q2
are biased at a fixed current, so that any differential input signal
will force the output voltages of A1 and A2 to change accor-
dingly. A signal applied to the input creates a current through
R
G
, R1, and R2, such that the outputs of A1 and A2 deliver the
correct voltage. Topologically, Q1, A1, R1 and Q2, A2, R2 can be
viewed as precision current feedback amplifiers. The amplified
differential and common-mode signals are applied to a dif-
ference amplifier that rejects the common-mode voltage but
amplifies the differential voltage. The difference amplifier
employs innovations that result in low output offset voltage as
well as low output offset voltage drift. Laser-trimmed resistors
allow for a highly accurate in-amp with gain error typically less
than 20 ppm and CMRR that exceeds 90 dB (G = 1).
Using superbeta input transistors and an I
B
compensation
scheme, the AD8221 offers extremely high input impedance,
low I
B
, low I
B
drift, low I
OS
, low input bias current noise, and
extremely low voltage noise of 8 nV/√Hz.
The transfer function of the AD8221 is
G
R
G
kΩ
4
49
1
+
=
Users can easily and accurately set the gain using a single,
standard resistor.
Since the input amplifiers employ a current feedback architec-
ture, the AD8221’s gain-bandwidth product increases with gain,
resulting in a system that does not suffer from the expected
bandwidth loss of voltage feedback architectures at higher gains.
In order to maintain precision even at low input levels, special
attention was given to the AD8221’s design and layout, resulting
in an in-amp whose performance satisfies the most demanding
applications.
A unique pinout enables the AD8221 to meet a CMRR
specification of 80 dB at 10 kHz (G = 1) and 110 dB at 1 kHz
(G = 1000). The balanced pinout, shown in Figure 43, reduces
the parasitics that had, in the past, adversely affected CMRR
performance. In addition, the new pinout simplifies board
layout because associated traces are grouped together. For
example, the gain setting resistor pins are adjacent to the inputs,
and the reference pin is next to the output.
8
7
6
5
1
2
3
4
–IN
R
G
R
G
+V
S
V
OUT
REF
–V
S
+IN
TOP VIEW
AD8221
0
Figure 43. Pinout Diagram
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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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