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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： | 12/16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
12
______________________________________________________________________________________
bility is maintained with up to 400pF of output capaci-
tance. If the output sources either more or less current,
stability is increased. These devices perform well with a
1000pF pure capacitive load (Figure 5). Figure 6 shows
the performance with a 500pF load in parallel with vari-
ous load resistors.
To increase stability while driving large capacitive
loads, connect a pull-up resistor at the output to
decrease the current that the amplifier must source. If
the amplifier is made to sink current rather than source,
stability is further increased.
Frequency stability can be improved by adding an out-
put isolation resistor (R
S
) to the voltage follower circuit
(Figure 7). This resistor improves the phase margin of
the circuit by isolating the load capacitor from the op
amp’s output. Figure 8a shows the MAX492 driving
10,000pF (R
L
≥
100k
), while Figure 8b adds a 47
isolation resistor.
Because the MAX492/MAX494/MAX495 have excellent
stability, no isolation resistor is required, except in the
most demanding applications. This is beneficial
because an isolation resistor would degrade the low-
frequency performance of the circuit.
10
μ
s/div
V
50mV/div
V
50mV/div
MAX49_
V
OUT
V
IN
C
L
R
S
10
μ
s/div
V
50mV/div
V
50mV/div
10
μ
s/div
V
50mV/div
V
50mV/div
Figure 7. Capacitive-Load Driving Circuit
Figure 6c. MAX492 Voltage Follower with 500pF Load—
R
L
=
∞
Figure 6a. MAX492 Voltage Follower with 500pF Load—
R
L
= 5k
Figure 6b. MAX492 Voltage Follower with 500pF Load—
R
L
= 20k
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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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