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| 型号： | ADA4091-2ARZ-RL |
| 厂商： | Analog Devices Inc |
| 文件页数： | 7/20页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP GP R-R 1.27MHZ 8SOIC |
| 设计资源： | 30 V Low Cost DAC Using AD5292 Digital Potentiometer (CN0111) |
| 标准包装： | 2,500 |
| 放大器类型： | 通用 |
| 电路数： | 2 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.46 V/µs |
| 增益带宽积： | 1.27MHz |
| 电流 - 输入偏压： | 50nA |
| 电压 - 输入偏移： | 35µV |
| 电流 - 电源： | 200µA |
| 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 ~ 125°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
ADA4091-2/ADA4091-4
Rev. G | Page 15 of 20
INPUT OVERVOLTAGE PROTECTION
The ADA4091-x has two different ESD circuits for enhanced
protection, as shown in Figure 48.
07671-
023
D4
D3
D1
+V
–V
D2
D8
D7 R2
D5
R1
D6
Figure 48. Complete Input Protection Network
One circuit is a series resistor of 5 kΩ to the internal inputs and
diodes (D1 and D2 or D5 and D6) from the internal inputs to
the supply rails. The other protection circuit is a circuit with
two DIACs (D3 and D4 or D7 and D8) to the supply rails. A
DIAC can be considered a bidirectional Zener diode with a
transfer characteristic, as shown in Figure 49.
–3
–2
–1
0
1
2
3
4
5
–40
–50
–20
0
20
30
–30
10
–10
40
50
07671-
100
VOLTAGE (V)
CURRE
NT
(
mA)
Figure 49. DIAC Transfer Characteristic
For a worst-case design analysis, consider two cases. The
ADA4091-x has a normal ESD structure from the internal op
amp inputs to the supply rails. In addition, it has 42 V DIACs
from the external inputs to the rails, as shown in Figure 47.
Therefore, two conditions need to be considered to determine
which case is the limiting factor.
Condition 1. Consider, for example, that when operating
on ±15 V, the inputs can go +42 V above the negative
supply rail. With the V pin equal to 15 V, +42 V above
this supply (the negative supply) is +27 V.
Condition 2. There is a restriction on the input current of
5 mA through a 5 kΩ resistor to the ESD structure to the
positive rail. In Condition 1, +27 V through the 5 kΩ
resistor to +15 V gives a current of 2.4 mA. Thus, the
DIAC is the limiting factor. If the ADA4091-x supply
voltages are changed to ±5 V, then 5 V + 42 V = +37 V.
However, +5 V + (5 kΩ × 5 mA) = 30 V. Thus, the normal
resistor diode structure is the limitation when running on
lower supply voltages.
Additional resistance can be added externally in series with
each input to protect against higher peak voltages; however, the
additional thermal noise of the resistors must be considered.
The flatband voltage noise of the ADA4091-x is approximately
24 nV/√Hz, and a 5 kΩ resistor has a noise of 9 nV/√Hz. Adding
an additional 5 kΩ resistor increases the total noise by less than
15% root sum square (rss). Therefore, maintain resistor values
below this value (5 kΩ) when overall noise performance is critical.
Note that this represents input protection under abnormal con-
ditions only. The correct amplifier operation input voltage range
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