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參數(shù)資料
| 型號： | MAX991 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | BACKSHELL |
| 中文描述： | 高速、微功耗、低電壓、SOT23封裝、滿擺幅輸入/輸出比較器 |
| 文件頁數(shù)： | 9/12頁 |
| 文件大?。?/td> | 141K |
| 代理商： | MAX991 |
M
High-S peed, Mic ropower, Low-Voltage,
S OT 23, Rail-to-Rail I/O Comparators
_______________________________________________________________________________________
9
5) Calculate R2 as shown. For this example, choose an
8.2k
standard value:
1
V
V
1
3.0V
1.2 x 12k
12
6) Verify trip voltages and hysteresis as follows:
MAX988/MAX992/MAX996
The MAX988/MAX992/MAX996 have ±2.5mV internal
hysteresis. They have open-drain outputs and require
an external pull-up resistor (Figure 2). Additional hys-
teresis can be generated using positive feedback, but
the formulas differ slightly from those of the
MAX987/MAX991/MAX995.
Use the following procedure to calculate resistor
values:
1) Select R3 according to the formulas R3 = V
REF
/ 1μA
or R3 = (V
REF
- V
CC
) / 1μA - R4. Use the smaller of
the two resulting resistor values.
2) Choose the hysteresis band required (V
HB
). For this
example, choose 50mV.
3) Calculate R1 according to the following equation:
R1 = (R3 + R4) x (V
HB
/ V
CC
)
4) Choose the trip point for V
IN
rising (V
THR
; V
THF
is
the trip point for V
IN
falling). This is the threshold
voltage at which the comparator switches its output
from low to high as V
IN
rises above the trip point.
5) Calculate R2 as follows:
6) Verify trip voltages and hysteresis as follows:
Circ uit Layout and Bypassing
These comparators’ high-gain bandwidth requires
design precautions to maximize their high-speed capa-
bility. The recommended precautions are:
1) Use a printed circuit board with an unbroken, low-
inductance ground plane.
2) Place a decoupling capacitor (a 0.1μF ceramic
capacitor is a good choice) as close to V
CC
as
possible.
3) On the inputs and outputs, keep lead lengths short
to avoid unwanted parasitic feedback around the
comparators.
4) Solder the devices directly to the printed circuit
board instead of using a socket.
V rising: V
= V
x R1 x
1
R1
V falling
THR
REF
1
2
R
+
+
+
:
+
3
=
=
1
3
4
1
4
R
R
V
V
R
R
x V
R
Hysteresis
V
V
THF
THR
CC
THR
THF
R2 =
1
V
V
THR
REF
+
x R
R
R
R
1
1
1
1
3
4
V rising: V
= V
x R1 x
1
R1
V falling
THR
REF
+
+
:
1
R
=
=
1
2
R
1
3
R
3
V
V
x V
R
Hysteresis
V
V
THF
THR
CC
THR
THF
R2 =
R2 =
THR
REF
.
8 03
x R
R
R
k
M
k
1
1
1
1
3
1
1
2 2
=
V
EE
V
CC
OUT
R3
R2
R1
R4
0.1
μ
F
V
REF
V
IN
V
CC
MAX988
MAX992
MAX996
Figure 2. Additional Hysteresis (MAX988/MAX992/MAX996)
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| MAX992 | BACKSHELL |
| MAX995 | BACKSHELL |
| MAX987-MAX996 | High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators |
| MAX987 | High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators |
| MAX987ESA | High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators |
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| MAX9910EXK-T | 功能描述:運算放大器 - 運放 200kHz 4uA Rail-Rail Op Amp 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 |
| MAX9911EVKIT# | 功能描述:放大器 IC 開發(fā)工具 200kHz 4uA Rail-to-Rail I/O Op Amps with Shutdown RoHS:否 制造商:International Rectifier 產(chǎn)品:Demonstration Boards 類型:Power Amplifiers 工具用于評估:IR4302 工作電源電壓:13 V to 23 V |
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