参数资料
| 型号： | AD627BR |
| 厂商： | Analog Devices Inc |
| 文件页数： | 16/25页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST R-R 25MA 8SOIC |
| 标准包装： | 98 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.06 V/µs |
| -3db带宽： | 80kHz |
| 电流 - 输入偏压： | 2nA |
| 电压 - 输入偏移： | 25µV |
| 电流 - 电源： | 60µA |
| 电流 - 输出 / 通道： | 25mA |
| 电压 - 电源，单路/双路(±)： | 2.2 V ~ 36 V，±1.1 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 |
AD627
Data Sheet
Rev. E | Page 22 of 24
APPLICATIONS CIRCUITS
CLASSIC BRIDGE CIRCUIT
Figure 50 shows the AD627 configured to amplify the signal
from a classic resistive bridge. This circuit works in dual-supply
mode or single-supply mode. Typically, the same voltage that
powers the instrumentation amplifiers excites the bridge.
Connecting the bottom of the bridge to the negative supply of
the instrumentation amplifiers (usually 0 V, 5 V, 12 V, or
15 V), sets up an input common-mode voltage that is
optimally located midway between the supply voltages. It is
also appropriate to set the voltage on the REF pin to midway
between the supplies, especially if the input signal is bipolar.
However, the voltage on the REF pin can be varied to suit the
application. For example, the REF pin is tied to the VREF pin of
an analog-to-digital converter (ADC) whose input range is
(VS + 100 mV) to (+VS 150 mV), the maximum programmable
gain is simply this output range divided by the input range.
VOUT
VDIFF
+VS
–VS
VREF
0.1F
AD627
RG = 200k
GAIN–5
00782-
048
Figure 50. Classic Bridge Circuit
4 mA TO 20 mA SINGLE-SUPPLY RECEIVER
Figure 51 shows how a signal from a 4 mA to 20 mA transducer
can be interfaced to the ADuC812, a 12-bit ADC with an
embedded microcontroller. The signal from a 4 mA to 20 mA
transducer is single-ended, which initially suggests the need for
a simple shunt resistor to convert the current to a voltage at the
high impedance analog input of the converter. However, any
line resistance in the return path (to the transducer) adds a
current dependent offset error; therefore, the current must be
sensed differentially.
In this example, a 24.9 shunt resistor generates a maximum
differential input voltage to the AD627 of between 100 mV
(for 4 mA in) and 500 mV (for 20 mA in). With no gain resistor
present, the AD627 amplifies the 500 mV input voltage by a
factor of 5, to 2.5 V, the full-scale input voltage of the ADC. The
zero current of 4 mA corresponds to a code of 819 and the LSB
size is 4.88 μA.
THERMOCOUPLE AMPLIFIER
Because the common-mode input range of the AD627 extends
0.1 V below ground, it is possible to measure small differential
signals that have a low, or no, common-mode component.
Figure 51 shows a thermocouple application where one side of
the J-type thermocouple is grounded.
Over a temperature range from 200°C to +200°C, the J-type
thermocouple delivers a voltage ranging from 7.890 mV to
2.1 k) and a voltage on the AD627 REF pin of 2 V result in the
output voltage of the AD627 ranging from 1.110 V to 3.077 V
relative to ground. For a different input range or different
voltage on the REF pin, it is important to verify that the voltage
on Internal Node A1 (see Figure 37) is not driven below
ground. This can be checked using the equations in the Input
VOUT
5V
VREF
0.1F
AD627
RG
2.1k
J-TYPE
THERMOCOUPLE
REF
00782-
050
Figure 51. Amplifying Bipolar Signals with Low Common-Mode Voltage
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| AD627BR-REEL | 功能描述:IC AMP INST R-R 25MA 8SOIC RoHS:否 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 |
| AD627BR-REEL7 | 功能描述:IC AMP INST R-R 25MA 8SOIC RoHS:否 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:3.5 V/µs 增益带宽积:1MHz -3db带宽:- 电流 - 输入偏压:30pA 电压 - 输入偏移:2000µV 电流 - 电源:200µA 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:0°C ~ 70°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 |
| AD627BRZ | 功能描述:IC AMP INST R-R 25MA 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 |
| AD627BRZ-R7 | 功能描述:IC AMP INST R-R 80MHZ DL 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 |
| AD627BRZ-RL | 功能描述:IC AMP INST R-R 25MA 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 |
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