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| 型号： | MAX4294ESD |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 18/18页 |
| 文件大小： | 0K |
| 描述： | IC OPAMP 1.8VU R/R I/O 14-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 放大器类型： | 通用 |
| 电路数： | 4 |
| 输出类型： | 满摆幅 |
| 转换速率： | 0.2 V/µs |
| 增益带宽积： | 500kHz |
| 电流 - 输入偏压： | 15nA |
| 电压 - 输入偏移： | 200µV |
| 电流 - 电源： | 100µA |
| 电流 - 输出 / 通道： | 20mA |
| 电压 - 电源，单路/双路(±)： | 1.8 V ~ 5.5 V，±0.9 V ~ 2.75 V |
| 工作温度： | -40°C ~ 85°C |
| 安装类型： | 表面贴装 |
| 封装/外壳： | 14-SOIC（0.154"，3.90mm 宽） |
| 供应商设备封装： | 14-SOIC |
| 包装： | 管件 |
capacitance) creates a parasitic pole that produces an
underdamped signal response. Reducing input capaci-
tance or placing a small capacitor across the feedback
resistor improves response in this case.
The MAX4291/MAX4292/MAX4294 family’s inputs are
protected from large differential input voltages by inter-
nal 10.6k
series resistors and back-to-back triple-
diode stacks across the inputs (Figure 2). For
differential input voltages (much less than 1.8V), input
resistance is typically 0.75M
. For differential input
voltages greater than 1.8V, input resistance is around
21.2k
, and the input bias current can be approximat-
ed by the following equation:
In the region where the differential input voltage
approaches 1.8V, the input resistance decreases expo-
nentially from 0.75M
to 21.2k as the diode block
begins to conduct. Conversely, the bias current
increases with the same curve.
In unity-gain configuration, high slew-rate input signals
may capacitively couple to the output through the triple-
diode stacks.
Rail-to-Rail Output Stage
The MAX4291/MAX4292/MAX4294 output stage can
drive up to a 2k
load and still swing to within 46mV of
the rails. Figure 3 shows the output-voltage swing of a
MAX4291 configured as a unity-gain buffer, powered
from a ±2.5V supply. The output for this setup typically
swings from (VEE + 25mV) to (VCC - 2mV) with a 100k
load.
Applications Information
Power-Supply Considerations
The MAX4291/MAX4292/MAX4294 operate from a sin-
gle 1.8V to 5.5V supply (or dual ±0.9V to ±2.75V sup-
plies) and consume only 100A of supply current per
amplifier. A high power-supply rejection ratio of 100dB
allows the amplifiers to be powered directly off a
decaying battery voltage, simplifying design and
extending battery life.
The MAX4291/MAX4292/MAX4294 are ideally suited for
use with most battery-powered systems. Table 1 lists a
I
(V
- 1.8V)
21.2k
BIAS
DIFF
=
MAX4291/MAX4292/MAX4294
Ultra-Small, 1.8V, Power,
Rail-to-Rail I/O Op Amps
_______________________________________________________________________________________
9
Table 1. MAX4291 Characteristics with Typical Battery Systems
750
Yes
Nickel-Cadmium
(2 cells)
1000
Yes
Lithium-Ion
(1 cell)
1000
Yes
Nickel-Metal-
Hydride (2 cells)
2000
No
Alkaline (2 cells)
BATTERY TYPE
CAPACITY, AA SIZE
(mA-h)
2.4
3.5
2.4
3.0
1.8
2.7
1.8
VEND-OF-LIFE (V)
VFRESH
(V)
RECHARGE-
ABLE
7500
10,000
20,000
MAX4291
OPERATING TIME IN
NORMAL MODE
(h)
OUT
2.5V/div
IN
2.5V/div
0
20
s/div
VCC = 2.5V, VEE = -2.5V
Figure 3. Rail-to-Rail Input/Output Voltage Range
10.6k
10.6k
IN-
IN+
Figure 2. Input Protection Circuit
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4294ESD+ | 功能描述:运算放大器 - 运放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4294ESD+T | 功能描述:运算放大器 - 运放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4294ESD-T | 功能描述:运算放大器 - 运放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4294EUD | 功能描述:运算放大器 - 运放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
| MAX4294EUD+ | 功能描述:运算放大器 - 运放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道数量:4 共模抑制比（最小值）:63 dB 输入补偿电压:1 mV 输入偏流（最大值）:10 pA 工作电源电压:2.7 V to 5.5 V 安装风格:SMD/SMT 封装 / 箱体:QFN-16 转换速度:0.89 V/us 关闭:No 输出电流:55 mA 最大工作温度:+ 125 C 封装:Reel |
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