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參數(shù)資料
| 型號： | MAX4249EUB |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | SOT23, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps |
| 中文描述： | DUAL OP-AMP, 750 uV OFFSET-MAX, 22 MHz BAND WIDTH, PDSO10 |
| 封裝： | MICRO, MO-187C-BA, SOP-10 |
| 文件頁數(shù)： | 9/16頁 |
| 文件大?。?/td> | 238K |
| 代理商： | MAX4249EUB |
For gains
≥
10V/V, the decompensated devices
(MAX4249/MAX4255/MAX4256/MAX4257) deliver the
best distortion performance, since they have a higher
slew rate and provide a higher amount of loop gain for
a given closed-loop gain setting. Capacitive loads
below 400pF do not significantly affect distortion
results. Distortion performance remains relatively con-
stant over supply voltages.
Low Noise
The amplifier’s input-referred noise voltage density is
dominated by flicker noise at lower frequencies, and by
thermal noise at higher frequencies. Because the ther-
mal noise contribution is affected by the parallel combi-
nation of the feedback resistive network (R
F
R
G
,
Figure 1), these resistors should be reduced in cases
where the system bandwidth is large and thermal noise
is dominant. This noise-contribution factor decreases,
however, with increasing gain settings.
For example, the input noise voltage density of the cir-
cuit with R
F
= 100k
, R
G
= 11k
(A
V
= 10V/V) is
e
n
= 15nV/
√
Hz
. e
n
can be reduced to 9nV/
√
Hz
by
choosing R
F
= 10k
, R
G
= 1.1k
(A
V
= 10V/V), at the
expense of greater current consumption and potentially
higher distortion. For a gain of 100V/V with R
F
= 100k
,
R
G
= 1.1k
, the e
n
is low (9nV/
√
Hz
).
Using a Feed-Forward
Compensation Capac itor, C
Z
The amplifier’s input capacitance is 11pF. If the resis-
tance seen by the inverting input is large (feedback
network), this can introduce a pole within the amplifier’s
bandwidth, resulting in reduced phase margin.
Compensate the reduced phase margin by introducing
a feed-forward capacitor (C
Z
) between the inverting
input and the output (Figure 1). This effectively cancels
the pole from the inverting input of the amplifier.
Choose the value of C
Z
as follows:
C
Z
≈
11 x (R
F
/ R
G
) [pF]
In the unity-gain-stable MAX4250–MAX4254, the use
of a proper C
Z
is most important for A
V
= +2V/V, and
A
V
= -1V/V. In the decompensated MAX4249/
MAX4255/MAX4256/MAX4257, C
Z
is most important for
A
V
= ±10V/V. Figures 2a and 2b show transient
response both with and without C
Z
.
Using a slightly smaller C
Z
than suggested by the for-
mula above achieves a higher bandwidth at the
expense of reduced phase and gain margin. As a gen-
eral guideline, consider using C
Z
for cases where
R
G
R
F
is greater than 20k
(MAX4250–MAX4254) or
greater than 5k
(MAX4249/MAX4255/MAX4256/
MAX4257).
M
S OT 23, S ingle-S upply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
_______________________________________________________________________________________
9
C
Z
R
F
V
OUT
V
IN
R
G
V
OUT
(100mV/
div)
0mV
100mV
V
IN
(50mV/
div)
2
μ
s/div
A
V
= +2
R
F
= R
G
= 100k
Figure 1. Adding Feed-Forward Compensation
Figure 2a. Pulse Response with No Feed-Forward
Compensation
100mV/
div
V
IN
0mV
100mV
V
OUT
50mV/
div
2
μ
s/div
A
V
= +2
R
F
= R
G
= 100k
C
Z
= 11pF
Figure 2b. Pulse Response with 10pF Feed-Forward
Compensation
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相關代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4249EUB+ | 功能描述:運算放大器 - 運放 Low-Distortion Rail-Rail Op Amp 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 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4249EUB+T | 功能描述:運算放大器 - 運放 Low-Distortion Rail-Rail Op Amp 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 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4249EUB-T | 功能描述:運算放大器 - 運放 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 關閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4250AAUK | 制造商:Maxim Integrated Products 功能描述:LOW-NOISE/DISTORTION SINGLE-SUPPLY - Cut Tape Product |
| MAX4250AAUK+ | 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP R-R O/P 2.75V/5.5V 5PIN SOT-23 - Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
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