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參數(shù)資料
| 型號(hào)： | MAX4219ESD |
| 廠(chǎng)商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類(lèi)： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | High-Speed, Single-Supply, Gain of @, Closed-Loop, Rail-to-Rail Buffers with Enable |
| 中文描述： | TRIPLE BUFFER AMPLIFIER, PDSO14 |
| 封裝： | SO-14 |
| 文件頁(yè)數(shù)： | 11/16頁(yè) |
| 文件大?。?/td> | 215K |
| 代理商： | MAX4219ESD |
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Driving large capacitive loads increases the chance of
oscillations occurring in most amplifier circuits. This is
especially true for circuits with high loop gains, such as
voltage followers. The buffer’s output resistance and the
load capacitor combine to add a pole and excess phase
to the loop response. If the frequency of this pole is low
enough to interfere with the loop response and degrade
phase margin sufficiently, oscillations can occur.
A second problem when driving capacitive loads
results from the amplifier’s output impedance, which
looks inductive at high frequencies. This inductance
forms an L-C resonant circuit with the capacitive load,
which causes peaking in the frequency response and
degrades the amplifier’s gain margin.
Figure 6 shows the devices’ frequency response under
different capacitive loads. To drive loads with greater
than 20pF of capacitance or to settle out some of the
peaking, the output requires an isolation resistor like
the one shown in Figure 7. Figure 8 is a graph of the
optimal isolation resistor versus load capacitance.
Figure 9 shows the frequency response of the
MAX4214/MAX4215/MAX4217/MAX4219/MAX4222
when driving capacitive loads with a 27
isolation
resistor.
Coaxial cables and other transmission lines are easily
driven when properly terminated at both ends with their
characteristic impedance. Driving back-terminated
transmission lines essentially eliminates the lines’
capacitance.
M
High-S peed, S ingle-S upply, Gain of +2,
Closed-Loop, Rail-to-Rail Buffers with Enable
______________________________________________________________________________________
11
MAX4214
MAX4215
MAX4217
MAX4219
MAX4222
500
500
OUT
IN-
IN+
Figure 5. Input Protection Circuit
6
-4
100k
10M
100M
1M
1G
-2
FREQUENCY (Hz)
N
0
2
4
5
-3
-1
1
3
C
L
= 10pF
C
L
= 5pF
C
L
= 15pF
Figure 6. Small-Signal Gain vs. Frequency with Load
Capacitance and No Isolation Resistor
500
500
R
ISO
C
L
V
OUT
V
IN
R
TIN
50
MAX42_ _
Figure 7. Driving a Capacitive Load Through an Isolation
Resistor
14
16
12
10
6
4
2
8
0
C
LOAD
(pF)
0
50
100
150
200
250
R
I
)
Figure 8. Isolation Resistance vs. Capacitive Load
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4219ESD+ | 功能描述:高速運(yùn)算放大器 Closed-Loop Rail-Rail Buffer RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4219ESD+T | 功能描述:高速運(yùn)算放大器 Closed-Loop Rail-Rail Buffer RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX4219ESD-T | 功能描述:高速運(yùn)算放大器 RoHS:否 制造商:Texas Instruments 通道數(shù)量:1 電壓增益 dB:116 dB 輸入補(bǔ)償電壓:0.5 mV 轉(zhuǎn)換速度:55 V/us 工作電源電壓:36 V 電源電流:7.5 mA 最大工作溫度:+ 85 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SOIC-8 封裝:Tube |
| MAX421C/D | 功能描述:運(yùn)算放大器 - 運(yùn)放 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(bǔ)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(fēng)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 |
| MAX421CPD | 功能描述:運(yùn)算放大器 - 運(yùn)放 Integrated Circuits (ICs) 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(bǔ)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(fēng)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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