参数资料
| 型号： | AD622AR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 2/17页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST LP 18MA 8SOIC |
| 标准包装： | 98 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 转换速率： | 1.2 V/µs |
| -3db带宽： | 1MHz |
| 电流 - 输入偏压： | 2nA |
| 电压 - 输入偏移： | 60µV |
| 电流 - 电源： | 900µA |
| 电流 - 输出 / 通道： | 18mA |
| 电压 - 电源，单路/双路(±)： | ±2.6 V ~ 18 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 8-SO |
| 包装： | 管件 |
Data Sheet
AD622
Rev. E | Page 9 of 16
THEORY OF OPERATION
The AD622 is a monolithic instrumentation amplifier based on
a modification of the classic three op amp approach. Absolute
value trimming allows the user to program gain accurately (to
0.5% at G = 1000) with only one resistor. Monolithic construction
and laser wafer trimming allow the tight matching and tracking
of circuit components, thus insuring AD622 performance.
Input Transistor Q1 and Input Transistor Q2 provide a single
differential-pair bipolar input for high precision (see Figure 16).
Feedback through the Q1-A1-R1 loop and the Q2-A2-R2 loop
maintains constant collector current of the Q1 and Q2 input
devices, thereby impressing the input voltage across External
Gain-Setting Resistor RG. This creates a differential gain from the
inputs to the A1 and A2 outputs given by G = (R1 + R2)/RG + 1.
Unity-Gain Subtractor A3 removes any common-mode signal,
yielding a single-ended output referred to the REF pin potential.
00777-
022
VB
–VS
A1
A2
A3
C2
RG
R1
R2
GAIN
SENSE
GAIN
SENSE
10k
10k
I2
I1
10k
REF
10k
+IN
– IN
R4
400
OUTPUT
C1
Q2
Q1
R3
400
+VS
20A
Figure 16. Simplified Schematic of the AD622
The value of RG also determines the transconductance of the
preamp stage. As RG is reduced for larger gains, the trans-
conductance increases asymptotically to that of the input
transistors. This has the following three important advantages:
Open-loop gain is boosted for increasing programmed
gain, thus reducing gain-related errors.
The gain-bandwidth product (determined by C1, C2, and
the preamp transconductance) increases with programmed
gain, thus optimizing frequency response.
The input voltage noise is reduced to a value of 12 nV/√Hz,
determined mainly by the collector current and base
resistance of the input devices.
The internal gain resistors, R1 and R2, are trimmed to an
absolute value of 25.25 k, allowing the gain to be programmed
accurately with a single external resistor.
MAKE vs. BUY: A TYPICAL APPLICATION ERROR
BUDGET
The AD622 offers cost and performance advantages over
discrete two op amp instrumentation amplifier designs along
with smaller size and fewer components. In a typical application
shown in Figure 17, a gain of 10 is required to receive and
amplify a 0 to 20 mA signal from the AD694 current transmitter.
The current is converted to a voltage in a 50 shunt. In
applications where transmission is over long distances, line
impedance can be significant so that differential voltage
measurement is essential. Where there is no connection
between the ground returns of transmitter and receiver, there
must be a dc path from each input to ground, implemented in
this case using two 1 k resistors. The error budget detailed in
Table 5 shows how to calculate the effect of various error
sources on circuit accuracy.
AD694
0 TO 20mA
TRANSMITTER
RL2
10
RL2
10
0 TO 20mA
50
0 TO 20mA CURRENT LOOP
WITH 50 SHUNT IMPEDANCE
RG
5.62k
1k
REF
AD622
AD622 MONOLITHIC INSTRUMENTATION
AMPLIFIER, G = 9.986
HOMEBREW IN-AMP, G = 10
1k
1/2
LT1013
1/2
LT1013
9k*
1k*
9k*
–
+
VIN
*0.1% RESISTOR MATCH, 50ppm/°C TRACKING
00777-
016
Figure 17. Make vs. Buy
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD622AR-REEL | 功能描述:IC AMP INST LP 18MA 8SOIC RoHS:否 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:1 输出类型:满摆幅 转换速率:0.11 V/µs 增益带宽积:350kHz -3db带宽:- 电流 - 输入偏压:4nA 电压 - 输入偏移:20µV 电流 - 电源:260µA 电流 - 输出 / 通道:20mA 电压 - 电源，单路/双路(±):2.7 V ~ 36 V，±1.35 V ~ 18 V 工作温度:-40°C ~ 85°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:带卷 (TR) |
| AD622AR-REEL7 | 功能描述:IC AMP INST LP 18MA 8SOIC RoHS:否 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 |
| AD622ARZ | 功能描述:IC AMP INST LP 18MA 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 |
| AD622ARZ-R7 | 功能描述:IC AMP INST LP 18MA 8SOIC 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 |
| AD622ARZ-RL | 功能描述:IC AMP INST LP 18MA 8SOIC RoHS:是 类别:集成电路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 标准包装:100 系列:- 放大器类型:通用 电路数:1 输出类型:- 转换速率:0.2 V/µs 增益带宽积:- -3db带宽:- 电流 - 输入偏压:100pA 电压 - 输入偏移:30µV 电流 - 电源:380µA 电流 - 输出 / 通道:- 电压 - 电源，单路/双路(±):±2 V ~ 18 V 工作温度:0°C ~ 70°C 安装类型:表面贴装 封装/外壳:8-SOIC（0.154"，3.90mm 宽） 供应商设备封装:8-SO 包装:管件 |
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