参数资料
| 型号： | AD623BR-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 11/24页 |
| 文件大小： | 0K |
| 描述： | IC AMP INST R-R LP 8SOIC |
| 产品变化通告： | Product Discontinuance 27/Oct/2011 |
| 标准包装： | 1,000 |
| 放大器类型： | 仪表 |
| 电路数： | 1 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.3 V/µs |
| -3db带宽： | 800kHz |
| 电流 - 输入偏压： | 17nA |
| 电压 - 输入偏移： | 25µV |
| 电流 - 电源： | 375µA |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 12 V，± 2.5 V ~ 6 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) |
AD623
Rev. D | Page 19 of 24
Ground Returns for Input Bias Currents
Input bias currents are those dc currents that must flow to bias
the input transistors of an amplifier. These are usually transistor
base currents. When amplifying floating input sources, such as
transformers or ac-coupled sources, there must be a direct dc
path into each input in order that the bias current can flow.
path can be provided for the cases of transformer coupling,
thermocouple, and capacitive ac coupling. In dc-coupled resistive
bridge applications, providing this path is generally not necessary
as the bias current simply flows from the bridge supply through
the bridge into the amplifier. However, if the impedances that
the two inputs see are large and differ by a large amount (>10 kΩ),
the offset current of the input stage causes dc errors
proportional with the input offset voltage of the amplifier.
AD623
OUTPUT
TO POWER
SUPPLY
GROUND
REF
LOAD
+VS
–VS
2
1
8
3
6
5
7
4
RG
–IN
+IN
007
78
-04
8
Figure 49. Ground Returns for Bias Currents with Transformer-Coupled Inputs
AD623
OTUPUT
TO POWER
SUPPLY
GROUND
REF
LOAD
+VS
–VS
2
1
8
3
6
5
7
4
RG
–IN
+IN
00
77
8-
0
49
Figure 50. Ground Returns for Bias Currents with Thermocouple Inputs
AD623
OUTPUT
TO POWER
SUPPLY
GROUND
REF
LOAD
+VS
–VS
2
1
8
3
6
5
7
4
RG
–IN
+IN
100k
00
77
8-
0
50
Figure 51. Ground Returns for Bias Currents with AC-Coupled Inputs
Output Buffering
The AD623 is designed to drive loads of 10 kΩ or greater. If
the load is less than this value, the output of the AD623 should
be buffered with a precision single-supply op amp, such as the
OP113. This op amp can swing from 0 V to 4 V on its output
while driving a load as small as 600 Ω. Table 7 summarizes the
performance of some buffer op amps.
5V
0.1F
5V
0.1F
AD623
OP113
RG
VIN
REFERENCE
VOUT
00
77
8-
05
1
Figure 52. Output Buffering
Table 7. Buffering Options
Op Amp
Description
Single supply, high output current
Rail-to-rail input and output, low supply current
Single-Supply Data Acquisition System
Interfacing bipolar signals to single-supply ADCs presents a
challenge. The bipolar signal must be mapped into the input
range of the ADC. Figure 53 shows how this translation can be
achieved.
5V
0.1F
5V
0.1F
AD623
RG
1.02k
REFERENCE
±10mV
AIN
REFOUT
REFIN
AD7776
00
77
8-
05
2
Figure 53. A Single-Supply Data Acquisition System
The bridge circuit is excited by a 5 V supply. The full-scale output
voltage from the bridge (±10 mV) therefore has a common-
mode level of 2.5 V. The AD623 removes the common-mode
component and amplifies the input signal by a factor of 100
(RGAIN = 1.02 kΩ). This results in an output signal of ±1 V. To
prevent this signal from running into the ground rail of the
AD623, the voltage on the REF pin must be raised to at least
1 V. In this example, the 2 V reference voltage from the AD7776
ADC is used to bias the output voltage of the AD623 to 2 V ± 1 V.
This corresponds to the input range of the ADC.
相关PDF资料 |
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| 2-320564-1 | CONN RING TONG 16AWG #3/8 TIN |
| 8020.0515.PT | FUSE 1.25A 250VAC AXIAL SLOW |
| AD623BR-REEL | IC AMP INST R-R LP 8SOIC |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| AD623BRZ | 功能描述:IC AMP INST R-R LP 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 |
| AD623BRZ | 制造商:Analog Devices 功能描述:INST AMP RR 12V 800KHZ 8SOIC |
| AD623BRZ-R7 | 功能描述:IC AMP INST R-R LP 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 |
| AD623BRZ-RL | 功能描述:IC AMP INST R-R LP 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 |
| AD623-EVAL | 制造商:Analog Devices 功能描述:Evaluation Board For The AD623 Converts A Differential Signal To A Single-Ended Signal |
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