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参数资料
| 型号： | MAX492 |
| 厂商： | Maxim Integrated Products, Inc. |
| 英文描述： | Dual, Micropower, Single-Supply Rail-to-Rail Op Amps(输入失调电压500μV,单电源满量程运放) |
| 中文描述： | 单/双/四路、微功耗、单电源、满摆幅运算放大器 |
| 文件页数： | 11/16页 |
| 文件大小： | 224K |
| 代理商： | MAX492 |
M
S ingle/Dual/Quad, Mic ropower,
S ingle-S upply Rail-to-Rail Op Amps
______________________________________________________________________________________
11
the op amp in an inverting configuration (Figure 3a);
connect resistor R3 between the noninverting input and
the input signal when using the op amp in a noninvert-
ing configuration (Figure 3b). Select R3 to equal the
parallel combination of R1 and R2. High source resis-
tances will degrade noise performance, due to the ther-
mal noise of the resistor and the input current noise
(which is multiplied by the source resistance).
Output Loading and S tability
Even with their low quiescent current of less than
150μA per op amp, the MAX492/MAX494/MAX495 are
well suited for driving loads up to 1k
while maintaining
DC accuracy. Stability while driving heavy capacitive
loads is another key advantage over comparable
CMOS rail-to-rail op amps.
In op amp circuits, driving large capacitive loads
increases the likelihood of oscillation. This is especially
true for circuits with high loop gains, such as a unity-
gain voltage follower. The output impedance and a
capacitive load form an RC network that adds a pole to
the loop response and induces phase lag. If the pole
frequency is low enough—as when driving a large
capacitive load—the circuit phase margin is degraded,
leading to either an under-damped pulse response or
oscillation.
The MAX492/MAX494/MAX495 can drive capacitive
loads in excess of 1000pF under certain conditions
(Figure 4). When driving capacitive loads, the greatest
potential for instability occurs when the op amp is
sourcing approximately 100μA. Even in this case, sta-
R1
V
OUT
R3 = R2
II
R1
R3
V
IN
R2
MAX49_
Figure 3a. Reducing Offset Error Due to Bias Current:
Inverting Configuration
R3
V
OUT
R3 = R2
II
R1
V
IN
R1
R2
MAX49_
Figure 3b. Reducing Offset Error Due to Bias Current:
Noninverting Configuration
V
50mV/div
V
50mV/div
10,000
100
1
10
100
M
RESISTIVE LOAD (k
)
C
1000
UNSTABLE REGION
V
CC
= +5V
V
OUT
= V
CC
/2
R
L
TO V
EE
A
V
= +1
Figure 4. Capacitive-Load Stable Region Sourcing Current
Figure 5. MAX492 Voltage Follower with 1000pF Load
(R
L
=
∞
)
相关PDF资料 |
PDF描述 |
|---|---|
| MAX494 | Quad, Micropower, Single-Supply Rail-to-Rail Op Amps(输入失调电压500μV,单电源满量程运放) |
| MAX5003 | High-Voltage PWM Power-Supply Controller |
| MAX5003CEE | High-Voltage PWM Power-Supply Controller |
| MAX5003CSE | High-Voltage PWM Power-Supply Controller |
| MAX5003EEE | High-Voltage PWM Power-Supply Controller |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX4920BETD+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4920BETD+T | 功能描述:电池管理 Battery Power-Up Logic RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX4921BETD+ | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX4921BETD+T | 功能描述:电池管理 Battery Power-Up Logic RoHS:否 制造商:Texas Instruments 电池类型:Li-Ion 输出电压:5 V 输出电流:4.5 A 工作电源电压:3.9 V to 17 V 最大工作温度:+ 85 C 最小工作温度:- 40 C 封装 / 箱体:VQFN-24 封装:Reel |
| MAX4924ELT+T | 功能描述:开关变换器、稳压器与控制器 Overvoltage Protector RoHS:否 制造商:Texas Instruments 输出电压:1.2 V to 10 V 输出电流:300 mA 输出功率: 输入电压:3 V to 17 V 开关频率:1 MHz 工作温度范围: 安装风格:SMD/SMT 封装 / 箱体:WSON-8 封装:Reel |
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