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參數(shù)資料
| 型號(hào)： | MAX494 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Quad, Micropower, Single-Supply Rail-to-Rail Op Amps(輸入失調(diào)電壓500μV,單電源滿量程運(yùn)放) |
| 中文描述： | 單/雙/四路、微功耗、單電源、滿擺幅運(yùn)算放大器 |
| 文件頁數(shù)： | 13/16頁 |
| 文件大小： | 224K |
| 代理商： | MAX494 |
Power-Up S ettling T ime
The MAX492/MAX494/MAX495 have a typical supply
current of 150μA per op amp. Although supply current
is already low, it is sometimes desirable to reduce it fur-
ther by powering down the op amp and associated ICs
for periods of time. For example, when using a MAX494
to buffer the inputs to a multi-channel analog-to-digital
converter (ADC), much of the circuitry could be pow-
ered down between data samples to increase battery
life. If samples are taken infrequently, the op amps,
along with the ADC, may be powered down most of the
time.
When power is reapplied to the MAX492/MAX494/
MAX495, it takes some time for the voltages on the sup-
ply pin and the output pin of the op amp to settle.
Supply settling time depends on the supply voltage, the
value of the bypass capacitor, the output impedance of
the incoming supply, and any lead resistance or induc-
tance between components. Op amp settling time
depends primarily on the output voltage and is slew-rate
limited. With the noninverting input to a voltage follower
held at mid-supply (Figure 9), when the supply steps
from 0V to V
CC
, the output settles in approximately 4μs
for V
CC
= +3V (Figure 10a) or 10μs for V
CC
= +5V
(Figure 10b).
M
S ingle/Dual/Quad, Mic ropower,
S ingle-S upply Rail-to-Rail Op Amps
______________________________________________________________________________________
13
V
50mV/div
V
50mV/div
10
μ
s/div
V
50mV/div
V
50mV/div
10
μ
s/div
MAX495
V
OUT
V
CC
2
3
1k
1k
+5V
7
4
6
Figure 9. Power-Up Test Configuration
Figure 8b. Driving a 10,000pF Capacitive Load with a 47
Isolation Resistor
Figure 8a. Driving a 10,000pF Capacitive Load
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