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參數(shù)資料
| 型號(hào)： | MAX4244 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Single/Dual/Quad, !.8V/10レA, SOT23, Beyond-the-Rails Op Amps |
| 中文描述： | 單/雙/四路、+1.8V/10µA、SOT23封裝、超擺幅運(yùn)算放大器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大小： | 174K |
| 代理商： | MAX4244 |
In the region where the differential input voltage
approaches 1.8V, the input resistance decreases expo-
nentially from 45M
to 4.4k
as the diode block begins
conducting. Conversely, the bias current increases with
the same curve.
Rail-to-Rail Output Stage
The MAX4240–MAX4244 output stage can drive up to a
10k
load and still swing to within 40mV of the rails.
Figure 3 shows the output voltage swing of a MAX4240
configured as a unity-gain buffer, powered from a single
+2V supply voltage. The output for this setup typically
swings from (V
EE
+ 6mV) to (V
CC
- 8mV) with a 100k
load.
__________Applic ations Information
Power-S upply Considerations
The MAX4240–MAX4244 operate from a single +1.8V
to +5.5V supply (or dual ±0.9V to ±2.75V supplies) and
consume only 10μA of supply current per amplifier. A
high power-supply rejection ratio of 90dB allows the
amplifiers to be powered directly off a decaying battery
voltage, simplifying design and extending battery life.
The MAX4240–MAX4244 are ideally suited for use with
most battery-powered systems. Table 1 lists a variety of
typical battery types showing voltage when fresh, volt-
age at end-of-life, capacity, and approximate operating
time from a MAX4240/MAX4241, assuming nominal
conditions for both normal and shutdown modes.
Although the amplifiers are fully guaranteed over tem-
perature for operation down to a +1.8V single supply,
even lower-voltage operation is possible in practice.
Figures 4 and 5 show the PSRR and supply current as
a function of supply voltage and temperature.
Power-Up S ettling T ime
The MAX4240–MAX4244 typically require 200μs to
power up after V
CC
is stable. During this start-up time,
the output is indeterminant. The application circuit
should allow for this initial delay.
S hutdown Mode
The MAX4241 (single) and MAX4243 (dual) feature a
low-power shutdown mode. When the shutdown pin
(
SHDN
) is pulled low, the supply current drops to 1μA
per amplifier, the amplifier is disabled, and the outputs
enter a high-impedance state. Pulling
SHDN
high or
leaving it floating enables the amplifier. Take care to
ensure that parasitic leakage current at the
SHDN
pin
does not inadvertently place the part into shutdown
mode when
SHDN
is left floating. Figure 6 shows the
output voltage response to a shutdown pulse. The logic
threshold for
SHDN
is always referred to V
CC
/ 2 (not to
M
S ingle/Dual/Quad, +1.8V /10μA, S OT 23,
Beyond-the-Rails Op Amps
______________________________________________________________________________________
11
1V/div
OUT
IN
1V/div
MAX4240-44 fig03
200
μ
s/div
R
L
= 100k
TIED TOV
EE
V
IN
= 2.0V
f
IN
= 1kHz
Figure 3. Rail-to-Rail Input/Output Voltage Range
100
60
1.0
1.2
2.0
70
90
M
SUPPLY VOLTAGE (V)
P
1.4
1.6
80
1.8
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
Figure 4. Power-Supply Rejection Ratio vs. Supply Voltage
12
0
1.0
1.2
2.0
2
4
10
M
SUPPLY VOLTAGE (V)
S
μ
A
1.4
1.6
6
8
1.8
T
A
= +85°C
T
A
= +25°C
T
A
= -40°C
Figure 5. Supply Current vs. Supply Voltage
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX4244ESD | Single/Dual/Quad, !.8V/10レA, SOT23, Beyond-the-Rails Op Amps |
| 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 |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4244ESD | 功能描述:運(yùn)算放大器 - 運(yùn)放 1.8V 10uA Beyond the-Rails 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 |
| MAX4244ESD+ | 功能描述:運(yùn)算放大器 - 運(yùn)放 1.8V 10uA Beyond the-Rails 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 |
| MAX4244ESD+T | 功能描述:運(yùn)算放大器 - 運(yùn)放 1.8V 10uA Beyond the-Rails 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 |
| MAX4244ESD-T | 功能描述:運(yùn)算放大器 - 運(yùn)放 1.8V 10uA Beyond the-Rails 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 |
| MAX4245AUT | 制造商:Maxim Integrated Products 功能描述:ULTRA-SMALL RAIL-TO-RAIL I/O WITH - Rail/Tube |
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