參數資料
型號: MAX4244ESD
廠商: MAXIM INTEGRATED PRODUCTS INC
元件分類: 運動控制電子
英文描述: Single/Dual/Quad, !.8V/10レA, SOT23, Beyond-the-Rails Op Amps
中文描述: QUAD OP-AMP, 1300 uV OFFSET-MAX, 0.09 MHz BAND WIDTH, PDSO14
封裝: SOIC-14
文件頁數: 10/16頁
文件大?。?/td> 174K
代理商: MAX4244ESD
M
S ingle/Dual/Quad, +1.8V /10μA, S OT 23,
Beyond-the-Rails Op Amps
10
______________________________________________________________________________________
_______________Detailed Desc ription
Beyond-the-Rails Input S tage
The MAX4240–MAX4244 have Beyond-the-Rails inputs
and Rail-to-Rail
output stages that are specifically
designed for low-voltage, single-supply operation. The
input stage consists of separate NPN and PNP differen-
tial stages, which operate together to provide a com-
mon-mode range extending to 200mV beyond both
supply rails. The crossover region of these two pairs
occurs halfway between V
CC
and V
EE
. The input offset
voltage is typically 200μV. Low operating supply voltage,
low supply current, beyond-the-rails common-mode
input range, and rail-to-rail outputs make this family of
operational amplifiers an excellent choice for precision or
general-purpose, low-voltage battery-powered systems.
Since the input stage consists of NPN and PNP pairs,
the input bias current changes polarity as the common-
mode voltage passes through the crossover region.
Match the effective impedance seen by each input to
reduce the offset error caused by input bias currents
flowing through external source impedances (Figures
1a and 1b). The combination of high source impedance
plus input capacitance (amplifier input capacitance
plus stray capacitance) creates a parasitic pole that
produces an underdamped signal response. Reducing
input capacitance or placing a small capacitor across
the feedback resistor improves response in this case.
The MAX4240–MAX4244 family’s inputs are protected
from large differential input voltages by internal 2.2k
series resistors and back-to-back triple-diode stacks
across the inputs (Figure 2). For differential input volt-
ages (much less than 1.8V), input resistance is typically
45M
. For differential input voltages greater than 1.8V,
input resistance is around 4.4k
, and the input bias
current can be approximated by the following equation:
I
BIAS
= (V
DIFF
- 1.8V) / 4.4k
R3
V
IN
R3 = R1 R2
R1
R2
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
Figure 1a. Minimizing Offset Error Due to Input Bias Current
(Noninverting)
R3
R3 = R1 R2
R1
R2
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
V
IN
Figure 1b. Minimizing Offset Error Due to Input Bias Current
(Inverting)
2.2k
2.2k
IN-
IN+
Figure 2. Input Protection Circuit
相關PDF資料
PDF描述
MAX4240EUK-T Single/Dual/Quad, !.8V/10レA, SOT23, Beyond-the-Rails Op Amps
MAX4242EUA Single/Dual/Quad, !.8V/10レA, SOT23, Beyond-the-Rails Op Amps
MAX4282 SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps
MAX4175 SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps
MAX4274 SOT23, Rail-to-Rail, Fixed-Gain GainAmps/Open-Loop Op Amps
相關代理商/技術參數
參數描述
MAX4244ESD+ 功能描述:運算放大器 - 運放 1.8V 10uA Beyond the-Rails RoHS:否 制造商:STMicroelectronics 通道數量: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
MAX4244ESD+T 功能描述:運算放大器 - 運放 1.8V 10uA Beyond the-Rails RoHS:否 制造商:STMicroelectronics 通道數量: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
MAX4244ESD-T 功能描述:運算放大器 - 運放 1.8V 10uA Beyond the-Rails RoHS:否 制造商:STMicroelectronics 通道數量: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
MAX4245AUT 制造商:Maxim Integrated Products 功能描述:ULTRA-SMALL RAIL-TO-RAIL I/O WITH - Rail/Tube
MAX4245AUT+ 制造商:Maxim Integrated Products 功能描述:OP AMP SGL GP R-R I/O 2.75V/5.5V 6PIN SOT-23 - Rail/Tube