參數(shù)資料
型號： MAX988
廠商： Maxim Integrated Products, Inc.
英文描述： High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators
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： MAX988
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
MAX988ESA High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators
MAX988EUK-T High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators
MAX995ESD High-Speed, Micropower, Low-Voltage, SOT23, Rail-to-Rail I/O Comparators
MAX996 Hex 2-Input NAND Drivers 20-LCCC -55 to 125
MAX996ESD Hex 2-Input NAND Drivers 20-CDIP -55 to 125
相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX9880AETM+ 功能描述:接口—CODEC Stereo Audio CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
MAX9880AETM+T 功能描述:接口—CODEC Stereo Audio CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
MAX9880AEVKIT# 功能描述:音頻 IC 開發(fā)工具 MAX9880A Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V
MAX9880AEVKIT+ 功能描述:音頻 IC 開發(fā)工具 MAX9880A Eval Kit RoHS:否 制造商:Texas Instruments 產(chǎn)品:Evaluation Kits 類型:Audio Amplifiers 工具用于評估:TAS5614L 工作電源電壓:12 V to 38 V
MAX9880AEWM+T 功能描述:接口—CODEC Stereo Audio CODEC RoHS:否 制造商:Texas Instruments 類型: 分辨率: 轉(zhuǎn)換速率:48 kSPs 接口類型:I2C ADC 數(shù)量:2 DAC 數(shù)量:4 工作電源電壓:1.8 V, 2.1 V, 2.3 V to 5.5 V 最大工作溫度:+ 85 C 安裝風格:SMD/SMT 封裝 / 箱體:DSBGA-81 封裝:Reel
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