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參數(shù)資料
| 型號(hào)： | MAX4014 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost, High-Speed, Single-Supply, Gain of +2 Buffers with Rail-to-Rail Outputs in SOT23 |
| 中文描述： | 低成本、高速、單電源、增益為+2的緩沖器，滿擺幅輸出，SOT23封裝 |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 119K |
| 代理商： | MAX4014 |
M
Low-Cost, High-Speed, Single-Supply, Gain of +2
Buffers with Rail-to-Rail Outputs in SOT23
10
______________________________________________________________________________________
Disabled Output Resistanc e
The MAX4014/MAX4017/MAX4019/MAX4022 include
internal protection circuitry that prevents damage to the
precision input stage from large differential input volt-
ages, as shown in Figure 5. This protection circuitry con-
sists of five back-to-back Schottky diodes between IN_+
and IN_-. These diodes lower the disabled output resis-
tance from 1k
to 500
when the output voltage is 3V
greater or less than the voltage at IN_+. Under these
conditions, the input protection diodes will be forward
biased, lowering the disabled output resistance to 500
.
Output Capac itive Loading and S tability
The MAX4014/MAX4017/MAX4019/MAX4022 provide
maximum AC performance with no load capacitance.
This is the case when the load is a properly terminated
transmission line. However, they are designed to drive
up 25pF of load capacitance without oscillating, but
with reduced AC performance.
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 frequency response of the MAX4014/
MAX4017/MAX4019/MAX4022 under different capacitive
loads. To drive loads with greater than 25pF of capaci-
tance or to settle out some of the peaking, the output
requires an isolation resistor like the one shown in
MAX4014
MAX4017
MAX4019
MAX4022
500
500
OUT
IN-
IN+
Figure 5. Input Protection Circuit
6
-4
100k
10M
100M
1M
1G
-2
FREQUENCY (Hz)
G
0
2
4
5
-3
-1
1
3
C
L
= 10pF
C
L
= 15pF
C
L
= 5pF
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
MAX40_ _
Figure 7. Driving a Capacitive Load through an Isolation Resistor
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4014EUK | Low-Cost, High-Speed, Single-Supply, Gain of +2 Buffers with Rail-to-Rail Outputs in SOT23 |
| MAX4019 | Low-Cost, High-Speed, Single-Supply, Gain of +2 Buffers with Rail-to-Rail Outputs in SOT23 |
| MAX4019ESD | Low-Cost, High-Speed, Single-Supply, Gain of +2 Buffers with Rail-to-Rail Outputs in SOT23 |
| MAX4022 | Low-Cost, High-Speed, Single-Supply, Gain of +2 Buffers with Rail-to-Rail Outputs in SOT23 |
| MAX4022EEE | Low-Cost, High-Speed, Single-Supply, Gain of +2 Buffers with Rail-to-Rail Outputs in SOT23 |
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