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參數(shù)資料
| 型號(hào)： | MAX4257 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | SOT23, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps |
| 中文描述： | UCSP封裝、單電源、低噪聲、低失真、滿擺幅運(yùn)算放大器 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 238K |
| 代理商： | MAX4257 |
M
Applic ations Information
The MAX4249–MAX4257 combine good driving capa-
bility with ground-sensing input and rail-to-rail output
operation. With their low distortion, low noise and low
power consumption, they are ideal for use in portable
instrumentation systems and other low-power, noise-
sensitive applications.
Ground-S ensing and
Rail-to-Rail Outputs
The common-mode input range of the MAX4249–
MAX4257 extends down to ground, and offers excellent
common-mode rejection. These devices are guaran-
teed not to undergo phase reversal when the input is
overdriven (Figure 3).
Figure 4 showcases the true rail-to-rail output operation
of the amplifier, configured with A
V
= 10V/V. The output
swings to within 8mV of the supplies with a 10k
load,
making the devices ideal in low-supply-voltage applica-
tions.
Output Loading and S tability
Even with their low quiescent current of 400μA, these
amplifiers can drive 1k
loads while maintaining excel-
lent DC accuracy. Stability while driving heavy capaci-
tive loads is another key feature.
These devices maintain stability while driving loads up
to 400pF. To drive higher capacitive loads, place a
small isolation resistor in series between the output of
the amplifier and the capacitive load (Figure 5). This
resistor improves the amplifier’s phase margin by iso-
lating the capacitor from the op amp’s output.
Reference Figure 6 to select a resistance value that will
ensure a load capacitance that limits peaking to <2dB
(25%). For example, if the capacitive load is 1000pF,
the corresponding isolation resistor is 150
. Figure 7
shows that peaking occurs without the isolation resistor.
Figure 8 shows the unity-gain bandwidth vs. capacitive
load for the MAX4250–MAX4254.
Power S upplies and Layout
The MAX4249–MAX4257 operate from a single +2.4V
to +5.5V power supply or from dual supplies of ±1.20V
to ±2.75V. For single-supply operation, bypass the
S OT 23, S ingle-S upply, Low-Noise,
Low-Distortion, Rail-to-Rail Op Amps
10
______________________________________________________________________________________
OV
V
OUT
4.25V
4.45V
V
IN
-200mV
0
0
20
μ
s/div
A
V
= +1
V
DD
= +5V
R
L
= 10k
Figure 3. Overdriven Input Showing No Phase Reversal
V
OUT
1V/
div
0V
5V
200
μ
s/div
V
DD
= +5V
R
L
= 10k
A
V
= +10
f = 1kHz
Figure 4. Rail-to-Rail Output Operation
V
OUT
V
IN
R
ISO
C
L
MAX4250
MAX4251
MAX4252
MAX4253
MAX4254
Figure 5. Capacitive-Load Driving Circuit
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4249 | Differential Bus Transceivers 8-SOIC -40 to 125 |
| MAX4249ESD | Differential Bus Transceivers 8-SOIC |
| MAX4249EUB | SOT23, Single-Supply, Low-Noise, Low-Distortion, Rail-to-Rail Op Amps |
| MAX4298 | Ultra-High PSRR Stereo Drivers + Microphone Amp + 100mA Linear Regulator |
| MAX4298ESD | Ultra-High PSRR Stereo Drivers + Microphone Amp + 100mA Linear Regulator |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4257ESA | 功能描述:運(yùn)算放大器 - 運(yùn)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(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 |
| MAX4257ESA+ | 功能描述:運(yùn)算放大器 - 運(yùn)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(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 |
| MAX4257ESA+T | 功能描述:運(yùn)算放大器 - 運(yùn)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(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 |
| MAX4257ESA-T | 功能描述:運(yùn)算放大器 - 運(yùn)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(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 |
| MAX4257EUA | 功能描述:運(yùn)算放大器 - 運(yùn)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(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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