參數(shù)資料
型號： MAX988ESA+T
廠商： Maxim Integrated Products
文件頁數(shù)： 13/13頁
文件大?。?/td> 0K
描述： IC COMPARATOR R-R 8-SOIC
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標準包裝： 2,500
類型： 通用
元件數(shù)： 1
輸出類型： CMOS，開漏極，軌至軌，TTL
電壓 - 電源，單路/雙路(±)： 2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V
電壓 - 輸入偏移（最小值）： 5mV @ 5.5V
電流 - 輸入偏壓（最小值）： 1pA @ 5.5V
電流 - 靜態(tài)（最大值）： 96µA
CMRR, PSRR（標準）： 80dB CMRR，80dB PSRR
傳輸延遲（最大）： 210ns
磁滯： ±2.5mV
工作溫度： -40°C ~ 85°C
封裝/外殼： 8-SOIC（0.154"，3.90mm 寬）
安裝類型： 表面貼裝
包裝： 帶卷 (TR)
MAX987/MAX988/MAX991/MAX992/MAX995/MAX996
High-Speed, Micropower, Low-Voltage,
SOT23, Rail-to-Rail I/O Comparators
_______________________________________________________________________________________
9
5) Calculate R2 as shown. For this example, choose an
8.2k standard value:
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 pullup 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 = VREF / 1A
or R3 = (VREF - VCC) / 1A - R4. Use the smaller of
the two resulting resistor values.
2) Choose the hysteresis band required (VHB). For this
example, choose 50mV.
3) Calculate R1 according to the following equation:
R1 = (R3 + R4) x (VHB / VCC)
4) Choose the trip point for VIN rising (VTHR; VTHF is
the trip point for VIN falling). This is the threshold
voltage at which the comparator switches its output
from low to high as VIN rises above the trip point.
5) Calculate R2 as follows:
6) Verify trip voltages and hysteresis as follows:
Circuit 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 PCB with an unbroken, low-inductance
ground plane.
2) Place a decoupling capacitor (a 0.1F ceramic
capacitor is a good choice) as close to VCC 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 PCB instead of
using a socket.
V
rising: V
= V
x R1 x
1
R1
V
falling
IN
THR
REF
IN
:
++
+
=
+
=
1
2
1
34
1
34
RR
R
VV
Rx V
RR
Hysteresis
V
THF
THR
CC
THR
THF
R2 =
1
V
THR
REF xR
R
1
34
+
V
rising: V
= V
x R1 x
1
R1
V
falling
IN
THR
REF
IN
:
++
=
=
1
2
1
3
1
3
RR
VV
Rx V
R
Hysteresis
V
THF
THR
CC
THR
THF
R2 =
1
V
R2 =
1
3.0V
1.2 x 12k
THR
REF
.
xR
R
kM
k
1
3
1
12
1
22
803
=
VEE
VCC
OUT
R3
R2
R1
R4
0.1F
VREF
VIN
VCC
MAX988
MAX992
MAX996
Figure 2. Additional Hysteresis (MAX988/MAX992/MAX996)
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相關(guān)代理商/技術(shù)參數(shù)
參數(shù)描述
MAX988EUK 制造商:Maxim Integrated Products 功能描述:STD IS -T, REQUIRES Q#, NCNR - Rail/Tube 制造商:Rochester Electronics LLC 功能描述:
MAX988EUK+ 制造商:Maxim Integrated Products 功能描述:COMPARATOR SGL R-R I/O 2.75V/5.5V 5PIN SOT-23 - Rail/Tube
MAX988EUK+T 功能描述:校驗器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
MAX988EUK-T 功能描述:校驗器 IC Single uPower Comparator RoHS:否 制造商:STMicroelectronics 產(chǎn)品: 比較器類型: 通道數(shù)量: 輸出類型:Push-Pull 電源電壓-最大:5.5 V 電源電壓-最小:1.1 V 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel
MAX988EXK 制造商:Maxim Integrated Products 功能描述:- Cut Tape Product
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