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參數(shù)資料
| 型號： | AD628ARZ |
| 廠商： | ANALOG DEVICES INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | High Common-Mode Voltage, Programmable Gain Difference Amplifier |
| 中文描述： | OP-AMP, 1500 uV OFFSET-MAX, PDSO8 |
| 封裝： | ROHS COMPLIANT, MS-012AA, SOIC-8 |
| 文件頁數(shù)： | 16/20頁 |
| 文件大?。?/td> | 298K |
| 代理商： | AD628ARZ |
AD628
The differential input voltage range is constrained to the linear
operation of the internal amplifiers A1 and A2. The voltage
applied to the inputs of A1 and A2 should be between
V
S
+ 1.2 V and V
S+
1.2 V. Similarly, the outputs of A1 and A2
should be kept between V
S
+ 0.9 V and V
S+
0.9 V.
Rev. F | Page 16 of 20
VOLTAGE LEVEL CONVERSION
Industrial signal conditioning and control applications typically
require connections between remote sensors or amplifiers and
centrally located control modules. Signal conditioners provide
output voltages of up to ±10 V full scale. However, ADCs or
microprocessors operating on single 3.3 V to 5 V logic supplies
are now the norm. Thus, the controller voltages require further
reduction in amplitude and reference.
Furthermore, voltage potentials between locations are seldom
compatible, and power line peaks and surges can generate
destructive energy between utility grids. The AD628 offers an
ideal solution to both problems. It attenuates otherwise destruc-
tive signal voltage peaks and surges by a factor of 10 and shifts
the differential input signal to the desired output voltage.
Conversion from voltage-driven or current-loop systems is
easily accomplished using the circuit shown in Figure 32. This
shows a circuit for converting inputs of various polarities and
amplitudes to the input of a single-supply ADC.
To adjust common-mode output voltage, connect Pin 3 (V
REF
)
and the lower end of the 10 kΩ resistor to the desired voltage.
The output common-mode voltage is the same as the reference
voltage.
Designing such an application can be done in a few simple
steps, including the following:
Determine the required gain. For example, if the input
voltage must be transformed from ±10 V to 0 V to +5 V,
the gain is +5/+20 or +0.25.
Determine if the circuit common-mode voltage should be
changed. An AD7940 ADC is illustrated for this example.
When operating from a 5 V supply, the common-mode
voltage of the AD7940 is half the supply, or 2.5 V. If the
AD628 reference pin and the lower terminal of the 10 kΩ
resistor are connected to a 2.5 V voltage source, the output
common-mode voltage is 2.5 V.
Table 6 shows resistor and reference values for commonly used
single-supply converter voltages. R
EXT3
is included as an option
to balance the source impedance into A2. This is described in
more detail in the Gain Adjustment section.
Table 6. Nearest 1% Resistor Values for Voltage Level
Conversion Applications
ADC
Supply
Voltage (V)
Voltage (V)
±10
5
2.5
±5
5
2.5
10
5
2.5
5
5
2.5
±10
3
1.25
±5
3
1.25
10
3
1.25
5
3
1.25
Input
Voltage (V)
Desired
Output
V
REF
(V)
2.5
2.5
0
0
1.25
1.25
0
0
R
EXT1
(kΩ)
15
39.7
39.7
89.8
2.49
15
15
39.7
R
EXT2
(kΩ)
10
10
10
10
10
10
10
10
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相關(guān)代理商/技術(shù)參數(shù) |
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|---|---|
| AD628ARZ-R7 | 功能描述:IC AMP PGA DIFF PREC 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:LinCMOS™ 放大器類型:通用 電路數(shù):4 輸出類型:- 轉(zhuǎn)換速率:0.05 V/µs 增益帶寬積:110kHz -3db帶寬:- 電流 - 輸入偏壓:0.7pA 電壓 - 輸入偏移:210µV 電流 - 電源:57µA 電流 - 輸出 / 通道:30mA 電壓 - 電源，單路/雙路(±):3 V ~ 16 V，±1.5 V ~ 8 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:14-SOIC（0.154"，3.90mm 寬） 供應商設備封裝:14-SOIC 包裝:管件 產(chǎn)品目錄頁面:865 (CN2011-ZH PDF) 其它名稱:296-1834296-1834-5 |
| AD628ARZ-RL | 功能描述:IC AMP PGA DIFF PREC 8SOIC RoHS:是 類別:集成電路 (IC) >> Linear - Amplifiers - Instrumentation 系列:- 標準包裝:50 系列:- 放大器類型:通用 電路數(shù):2 輸出類型:滿擺幅 轉(zhuǎn)換速率:1.8 V/µs 增益帶寬積:6.5MHz -3db帶寬:4.5MHz 電流 - 輸入偏壓:5nA 電壓 - 輸入偏移:100µV 電流 - 電源:65µA 電流 - 輸出 / 通道:35mA 電壓 - 電源，單路/雙路(±):1.8 V ~ 5.25 V，±0.9 V ~ 2.625 V 工作溫度:-40°C ~ 85°C 安裝類型:表面貼裝 封裝/外殼:10-TFSOP，10-MSOP（0.118"，3.00mm 寬） 供應商設備封裝:10-MSOP 包裝:管件 |
| AD628-EVAL | 制造商:Analog Devices 功能描述:Evaluation Board For High Voltage Current Shunt Sensing |
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| AD629_07 | 制造商:AD 制造商全稱:Analog Devices 功能描述:High Common-Mode Voltage, Difference Amplifier |
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