參數(shù)資料
型號： MAX990EUA+T
廠商： Maxim Integrated Products
文件頁數(shù)： 11/12頁
文件大?。?/td> 0K
描述： IC COMPARATOR R-R 8-UMAX
產(chǎn)品培訓(xùn)模塊： Lead (SnPb) Finish for COTS
Obsolescence Mitigation Program
標(biāo)準(zhǔn)包裝： 2,500
類型： 通用
元件數(shù)： 2
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）： 24µA
CMRR, PSRR（標(biāo)準(zhǔn)）： 80dB CMRR，80dB PSRR
傳輸延遲（最大）： 450ns
磁滯： ±3mV
工作溫度： -40°C ~ 85°C
封裝/外殼： 8-TSSOP，8-MSOP（0.118"，3.00mm 寬）
安裝類型： 表面貼裝
包裝： 帶卷 (TR)
MAX985/MAX986/MAX989/
MAX990/MAX993/MAX994
Micropower, Low-Voltage, UCSP/SC70,
Rail-to-Rail I/O Comparators
8
Maxim Integrated
5) Calculate R2 as follows. For this example, choose an
8.2k
standard value:
6) Verify trip voltages and hysteresis as follows:
MAX986/MAX990/MAX994
The MAX986/MAX990/MAX994 have ±3mV 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
MAX985/MAX989/MAX993.
Use the following procedure to calculate resistor
values:
1) Select R3 according to the formulas R3 = VREF /
500A or R3 = (VREF - VCC) / 500A - 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:
Board Layout and Bypassing
Power-supply bypass capacitors are not typically need-
ed, but use 100nF bypass capacitors when supply
impedance is high, when supply leads are long,
or when excessive noise is expected on the supply
lines. Minimize signal trace lengths to reduce stray
capacitance.
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
VREF
VIN
VCC
MAX986
MAX990
MAX994
Figure 2. Additional Hysteresis (MAX986/MAX990/MAX994)
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