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參數(shù)資料
| 型號： | MAX4294 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Ultra-Small, !.8V, レPower, Rail-to-Rail I/O Op Amps |
| 中文描述： | 超小型、+1.8V、微功耗、滿擺幅輸入/輸出運算放大器 |
| 文件頁數(shù)： | 11/16頁 |
| 文件大?。?/td> | 397K |
| 代理商： | MAX4294 |
Driving Capacitive Loads
The MAX4291/MAX4292/MAX4294 are unity-gain stable
for loads up to 100pF (see the Load Resistor vs.
Capacitive Load graph in the
Typical Operating
Characteristics
). Applications that require greater
capacitive drive capability should use an isolation
resistor between the output and the capacitive load
(Figure 7). Note that this alternative results in a loss of
gain accuracy because R
ISO
forms a voltage divider
with the load resistor.
Power-Supply Bypassing and Layout
The MAX4291/MAX4292/MAX4294 family operates from
either a single +1.8V to +5.5V supply or dual ±0.9V to
±2.75V supplies. For single-supply operation, bypass
the power supply with a 100nF capacitor to V
EE
(in this
case GND). For dual-supply operation, both the V
CC
and the V
EE
supplies should be bypassed to ground
with separate 100nF capacitors.
Good PC board layout techniques optimize perfor-
mance by decreasing the amount of stray capacitance
at the op amp’s inputs and output. To decrease stray
capacitance, minimize trace lengths and widths by
placing external components as close as possible to
the op amp. Surface-mount components are an excel-
lent choice.
Using the MAX4291/MAX4292/MAX4294
as Comparators
Although optimized for use as operational amplifiers,
the MAX4291/MAX4292/MAX4294 can also be used as
rail-to-rail I/O comparators. Typical propagation delay
depends on the input overdrive voltage, as shown in
Figure 8. External hysteresis can be used to minimize
the risk of output oscillation. The positive feedback cir-
cuit, shown in Figure 9, causes the input threshold to
change when the output voltage changes state. The
two thresholds create a hysteresis band that can be
calculated by the following equations:
When the output of the comparator is low, the supply
current increases. The output stage has biasing circuit-
ry to monitor the output current. When the amplifier is
M
Ultra-Small, +1.8V, μPower,
Rail-to-Rail I/O Op Amps
______________________________________________________________________________________
11
R
ISO
C
L
R
L
MAX4240
MAX4241
MAX4242
MAX4243
MAX4244
V
= R
L
≈
1
A
L
+ R
ISO
OUT
IN
Figure 7a. Using a Resistor to Isolate a Capacitive Load from
the Op Amp
OUT
IN
0
100mV
0
100mV
10
μ
s/div
V
CC
= +2.4V, R
L =
2k
TO V
EE,
C
L
= 1000pF
Figure 7b. Pulse Response Without Isolating Resistor
OUT
IN
0
100mV
0
100mV
10
μ
s/div
V
CC
= +2.4V, R
L =
2k
TO V
EE
, C
L
= 1000pF, R
ISO =
100
Figure 7c. Pulse Response with Isolating Resistor (100
)
V
V V
V 1 R1
HI
R2
R1
R
V
V
V
R1
R
V
HYST
LO
HYST
REF
LO
HYST
CC
+
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX4294ESD | 功能描述:運算放大器 - 運放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4294ESD+ | 功能描述:運算放大器 - 運放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4294ESD+T | 功能描述:運算放大器 - 運放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4294ESD-T | 功能描述:運算放大器 - 運放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
| MAX4294EUD | 功能描述:運算放大器 - 運放 1.8V uPower Rail-Rail RoHS:否 制造商:STMicroelectronics 通道數(shù)量:4 共模抑制比（最小值）:63 dB 輸入補償電壓:1 mV 輸入偏流（最大值）:10 pA 工作電源電壓:2.7 V to 5.5 V 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:QFN-16 轉(zhuǎn)換速度:0.89 V/us 關(guān)閉:No 輸出電流:55 mA 最大工作溫度:+ 125 C 封裝:Reel |
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