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參數(shù)資料
| 型號(hào)： | MAX9101EUK-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | +1.0V Micropower SOT23 Comparators |
| 中文描述： | COMPARATOR, 20000 uV OFFSET-MAX, PDSO5 |
| 封裝： | SOT-23, 5 PIN |
| 文件頁(yè)數(shù)： | 7/8頁(yè) |
| 文件大?。?/td> | 267K |
| 代理商： | MAX9101EUK-T |
M
+1.0V Micropower SOT23 Comparators
_______________________________________________________________________________________
7
Open-Drain Output (MAX9101)
The MAX9101 has an open-drain output, which can be
pulled up to +6.0V above ground independent of the
supply voltage. This is typically used with an external
pullup resistor, facilitating interface between mixed logic
voltages. Alternatively, multiple open-drain comparator
outputs can be connected in a wire-OR configuration.
Applications Information
Low-Voltage Operation: V
CC
= 1V
The minimum operating voltage is +1.0V. At lower sup-
ply voltages, the input common-mode range remains
rail-to-rail, but the comparator
’
s output drive capability is
reduced and propagation delay increases (see
Typical
Operating Characteristics
).
Internal Hysteresis
Hysteresis increases the comparators
’
noise margin by
increasing the upper threshold and decreasing the
lower threshold
(Figure 1)
. This hysteresis prevents the
comparator from providing multiple poles when driven
with a very-slow-changing signal.
Additional Hysteresis
These comparators have 1.0mV internal hysteresis.
Additional hysteresis can be generated with two resis-
tors using positive feedback
(Figure 2)
. Use the follow-
ing procedure to calculate resistor values:
1) Calculate the trip points of the comparator using
these formulas:
and
V
TH
is the threshold voltage at which the comparator
switches its output from high to low as V
IN
rises
above the trip point. V
TL
is the threshold voltage at
which the comparator switches its output from low to
high as V
IN
drops below the trip point.
2) The hysteresis band will be:
V
HYS
= V
TH
- V
TL
= V
CC
3) In this example, let V
CC
= +5V and V
REF
= +2.5V:
and
4) Select R2. In this example, we will choose 1k
.
5) Select V
HYS
. In this example, we will choose 50mV.
6) Solve for R1:
where R1
≈
100k
, V
TH
= 2.525V, and V
TL
= 2.475V.
Board Layout and Bypassing
A power-supply bypass capacitor is not normally
required, but 100nF bypass capacitors can be used
when the supply impedance is high or when the supply
0 050
.
5
1000
1 1000
R
=
V
V
R
+
R
R
HYS
CC
=
2
1
2
V
R
+
R
R
TL
=
.
2
1
2
V
R
+
R
R
TH
=
+
2 5
.
2 5
.
2
1
2
R
+
R
R
2
1
2
V
V
R
+
R
R
TL
REF
=
1
2
1
2
V
V
V
V
R
R
R
TH
REF
CC
REF
=
+
(
)
+
2
1
2
THRESHOLDS
OUT
IN-
IN+
V
HYST
HYSTERESIS
BAND
V
IN
- V
HYST
V
IN
- +V
HYST/2
GND
V
CC
OUT
R2
R2
V
IN
V
REF
V
CC
MAX9100
Figure 1. Threshold Hysteresis Band
Figure 2. Additional Hysteresis (MAX9100)
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