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參數(shù)資料
| 型號： | LMX321AXK |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | PLASTIC ENCAPSULATED DEVICES |
| 中文描述： | 塑封器件 |
| 文件頁數(shù)： | 9/13頁 |
| 文件大?。?/td> | 489K |
| 代理商： | LMX321AXK |
Detailed Description
Input Protection Circuit
The LMX321/LMX358/LMX324
’
s inputs are protected
from large differential input voltages by internal 3.5k
series resistors and back-to-back triple diode stacks
across the inputs (Figure 1). For differential input volt-
ages (much less than 1.8V), input resistance is typically
3M
. For differential input voltages greater than 1.8V,
input resistance is around 7k
, and the input bias cur-
rent can be approximated by the following equation:
I
BIAS
= (V
DIFF
- 1.8V) / 7k
In the region where the differential input voltage
approaches 1.8V, input resistance decreases exponen-
tially from 3M
to 7k
as the diode block begins con-
ducting. Inversely, the bias current increases with the
same curve.
Rail-to-Rail Output Stage
The LMX321/LMX358/LMX324 drive 2k
loads and still
typically swing within 40mV of the supply rails. Figure 2
shows the output voltage swing of the LMX321 config-
ured with A
VCL
= +2V/V.
Driving Capacitive Loads
Driving a capacitive load can cause instability in many
op amps, especially those with low quiescent current.
The LMX321/LMX358/LMX324 are unity-gain stable for
a range of capacitive loads to above 400pF. Figure 4
shows the response of the LMX321 with an excessive
capacitive load. Adding a series resistor between the
output and the load capacitor (Figure 5) improves the
circuit
’
s response by isolating the load capacitance
from the op amp
’
s output.
Applications Information
Power-Up
The LMX321/LMX358/LMX324 outputs typically settle
within 10μs after power-up. Figure 6 shows the output
voltage on power-up and power-down.
L
Single/Dual/Quad, General-Purpose,
Low-Voltage, Rail-to-Rail Output Op Amps
_______________________________________________________________________________________
9
3.5k
3.5k
Figure 1. Input Protection Circuit
200
μ
s/div
2.5V
-2.5V
V
OUT
1V/div
V
IN
2V/div
V
CC
= 2.5V, V
EE
= -2.5V, A
VCL
= 2V/V
Figure 2. Rail-to-Rail Output Swing
R
L
C
L
LMX321
LMX358
LMX324
Figure 3. Capacitive-Load-Driving Circuit
4
μ
s/div
2.6V
2.4V
2.6V
2.4V
V
OUT
100mV/div
V
IN
100mV/div
V
CC
= 5V, V
EE
= 0, C
L
= 2.2nF
R
L
= 2k
Figure 4. Output With Excessive Capacitive Load
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LMX321AXK+ | 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP R-R O/P 7V 5PIN SC-70 - Rail/Tube |
| LMX321AXK+T | 功能描述:運算放大器 - 運放 Single GP Low-V Rail-Rail Output RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMX321AXK-T | 功能描述:運算放大器 - 運放 Single GP Low-V Rail-Rail Output RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMX321ICT | 功能描述:運算放大器 - 運放 Low PWR 120uA 2.7V 2.3 to 5.5V 1.3 MHz RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| LMX321ILT | 功能描述:運算放大器 - 運放 Low PWR 120uA 2.7V 2.3 to 5.5V 1.3 MHz RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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