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參數(shù)資料
| 型號(hào)： | MAX4321 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Low-Cost, Low-Voltage, Rail-to-Rail, Input/Output, SOT23 5MHz Op Amp |
| 中文描述： | 低成本、低電壓、滿擺幅輸入/輸出、SOT23封裝5MHz運(yùn)算放大器 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 259K |
| 代理商： | MAX4321 |
M
Low-Cost, Low-Voltage, Rail-to-Rail,
Input/Output, SOT23 5MHz Op Amp
_______________________________________________________________________________________
7
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Applications Information
Rail-to-Rail Input Stage
The MAX4321 high-speed amplifier has rail-to-rail input
and output stages designed for low-voltage, single-
supply operation. The input stage consists of separate
NPN and PNP differential stages, which combine to
provide an input common-mode range extending to the
supply rails. The PNP stage is active for input voltages
close to the negative rail, and the NPN stage is active
for input voltages near the positive rail. The switchover
transition region, which occurs near V
CC
/ 2, has been
extended to minimize the slight degradation in CMRR
caused by the mismatch of the input pairs. Its low offset
voltage, high bandwidth, and rail-to-rail common-mode
range makes this op amp an excellent choice for preci-
sion, low-voltage, data-acquisition systems.
Since the input stage switches between the NPN and
PNP pairs, the input bias current changes polarity as
the input voltage passes through the transition region.
To reduce the offset error caused by input bias cur-
rents flowing through external source impedances,
match the effective impedance seen by each input
(Figures 1a, 1b). High source impedances, together
with the input capacitance, can create a parasitic pole
that produces an underdamped signal response.
Reducing the input impedance or placing a small (2pF
to 10pF) capacitor across the feedback resistor
improves the response.
The MAX4321
’
s inputs are protected from large differen-
tial input voltages by 1k
series resistors and back-to-
back triple diodes across the inputs (Figure 2). For
differential input voltages less than 1.8V, the input resis-
tance is typically 500k
. For differential input voltages
greater than 1.8V, the input resistance is approximately
2k
, and the input bias current is determined by the fol-
lowing equation:
I
= V
- 1.8V
2k
BIAS
DIFF
R3
R3 = R1 R2
R1
R2
MAX4321
Figure 1a. Reducing Offset Error Due to Bias Current
(Noninverting)
R3
R3 = R1 R2
R1
R2
MAX4321
Figure 1b. Reducing Offset Error Due to Bias Current
(Inverting)
1k
1k
Figure 2. Input Protection Circuit
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4321EUK | 制造商:Maxim Integrated Products 功能描述:- Rail/Tube 制造商:Rochester Electronics LLC 功能描述: |
| MAX4321EUK+ | 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP R-R I/O 3.25V/6.5V 5PIN SOT-23 - Rail/Tube |
| MAX4321EUK+T | 功能描述:運(yùn)算放大器 - 運(yùn)放 Rail-Rail Input/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(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 |
| MAX4321EUK-T | 功能描述:運(yùn)算放大器 - 運(yùn)放 Rail-Rail Input/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(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 |
| MAX4322ESA | 功能描述:運(yùn)算放大器 - 運(yùn)放 Low-Power Rail-Rail I/O 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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