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參數(shù)資料
| 型號(hào)： | MAX9119EXK-T |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | SC70, 1.8V, Nanopower, Beyond-the-Rails Comparators With/Without Reference |
| 中文描述： | COMPARATOR, 10000 uV OFFSET-MAX, 40000 ns RESPONSE TIME, PDSO5 |
| 封裝： | MO-203, SC-70, 5 PIN |
| 文件頁數(shù)： | 11/13頁 |
| 文件大?。?/td> | 336K |
| 代理商： | MAX9119EXK-T |
M
SC70, 1.8V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
______________________________________________________________________________________
11
THRESHOLDS
OUT
IN+
IN-
V
HB
HYSTERESIS
BAND
V
THF
V
THR
Figure 2. Threshold Hysteresis Band
V
CC
MAX9117
MAX9119
OUT
R3
R1
R2
V
REF
V
EE
V
IN
V
CC
Figure 3. MAX9117/MAX9119 Additional Hysteresis
MAX9117 (V
REF
= 1.252V) and V
CC
= +5V, and if
we choose I
R3
= 1μA, then the two resistor values
are 1.2M
and 3.8M
. Choose a 1.2M
standard
value for R3.
2) Choose the hysteresis band required (V
HB
). For this
example, choose 50mV.
3) Calculate R1 according to the following equation:
R1 = R3 (V
HB
/ V
CC
)
For this example, insert the values:
R1 = 1.2M
(50mV / 5V) = 12k
4) Choose the trip point for V
IN
rising (V
THR
) such that
V
THR
> V
REF
(R1 + R3) / R3, (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. For this example,
choose 3V.
5) Calculate R2 as follows:
R2 = 1 / [V
THR
/ (V
REF
R1) - (1 / R1) - (1 / R3)]
R2 = 1 / [3.0V / (1.2V
12k
) - (1 / 12k
) -
(1 / 1.2M
)] = 8.05k
For this example, choose an 8.2k
standard value.
6) Verify the trip voltages and hysteresis as follows:
V
IN
rising: V
THR
= V
REF
R1 [(1 / R1) + (1 / R2)
+ (1 / R3)]
V
IN
falling: V
THF
= V
THR
- (R1
V
CC
/ R3)
Hysteresis = V
THR
- V
THF
Additional Hysteresis (MAX9118/MAX9120)
The MAX9118/MAX9120 have a 4mV internal hysteresis
band. They have open-drain outputs and require an
external pullup resistor (Figure 4). Additional hysteresis
can be generated using positive feedback, but the for-
mulas differ slightly from those of the MAX9117/
MAX9119. Use the following procedure to calculate
resistor values.
1) Select R3 according to the formulas R3 = V
REF
/ 1μA
or R3 = (V
CC
- V
REF
) / 1μA - R4. Use the smaller of
the two resulting resistor values.
2) Choose the hysteresis band required (V
HB
).
3) Calculate R1 according to the following equation:
R1 = (R3 + R4) (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 the trip voltages and hysteresis as follows:
Hysteresis = V
THR
- V
THF
V
falling
V
V
R
R
R
R
R
R
+
R
R
V
IN
THF
REF
CC
:
=
×
+
+
+
×
1
1
1
1
2
1
3
4
1
3
4
V
ri
g
V
V
R
R
R
R
IN
THR
REF
sin :
=
×
+
+
1
1
1
1
2
1
3
R
V
V
R
R
R
THR
REF
2 1
1
1
1
1
3
×
(
)
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