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參數(shù)資料
| 型號： | 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)： | 12/16頁 |
| 文件大小： | 224K |
| 代理商： | MAX494 |
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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