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| 型号： | AD8626ARZ-REEL7 |
| 厂商： | Analog Devices Inc |
| 文件页数： | 5/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP JFET 5MHZ DUAL LP 8SOIC |
| 标准包装： | 1,000 |
| 放大器类型： | J-FET |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 5 V/µs |
| 增益带宽积： | 5MHz |
| 电流 - 输入偏压： | 0.25pA |
| 电压 - 输入偏移： | 350µV |
| 电流 - 电源： | 710µA |
| 电流 - 输出 / 通道： | 15mA |
| 电压 - 电源，单路/双路(±)： | 5 V ~ 26 V，±2.5 V ~ 13 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) |
Data Sheet
AD8625/AD8626/AD8627
Rev. F | Page 13 of 20
APPLICATIONS INFORMATION
The AD862x is one of the smallest and most economical
JFETs offered. It has true single-supply capability and has
an input voltage range that extends below the negative rail,
allowing the part to accommodate input signals below ground.
The rail-to-rail output of the AD862x provides the maximum
dynamic range in many applications. To provide a low offset,
low noise, high impedance input stage, the AD862x uses
n-channel JFETs. The input common-mode voltage extends
from 0.2 V below –VS to 2 V below +VS. Driving the input of
the amplifier, configured in the unity gain buffer, closer than
2 V to the positive rail causes an increase in common-mode
voltage error, as illustrated in Figure 15, and a loss of amplifier
bandwidth. This loss of bandwidth causes the rounding of the
output waveforms shown in Figure 39 and Figure 40, which
have inputs that are 1 V and 0 V from +VS, respectively.
The AD862x does not experience phase reversal with input
signals close to the positive rail, as shown in Figure 29. For
input voltages greater than +VSY, a resistor in series with the
AD862x’s noninverting input prevents phase reversal at the
expense of greater input voltage noise. This current-limiting
resistor should also be used if there is a possibility of the input
voltage exceeding the positive supply by more than 300 mV, or
if an input voltage is applied to the AD862x when ±VSY = 0.
Either of these conditions damages the amplifier if the
condition exists for more than 10 seconds. A 10 k resistor
allows the amplifier to withstand up to 10 V of continuous
overvoltage, while increasing the input voltage noise by a
negligible amount.
TIME (2
s/DIV)
03023-038
VOLTAGE
(2V/DIV)
INPUT
OUTPUT
VSY = 5V
4V
0V
Figure 39. Unity Gain Follower Response to 0 V to 4 V Step
TIME (2
s/DIV)
03023-039
VOLTAGE
(2V/DIV)
INPUT
OUTPUT
VSY = 5V
4V
0V
5V
0V
Figure 40. Unity Gain Follower Response to 0 V to 5 V Step
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