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參數資料
| 型號： | MAX9018B |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Octal Buffers/Drivers With 3-State Outputs 20-CDIP -55 to 125 |
| 中文描述： | SOT23封裝、雙路、高精度、1.8V、納安級功耗比較器，帶或不帶基準 |
| 文件頁數： | 14/16頁 |
| 文件大?。?/td> | 446K |
| 代理商： | MAX9018B |
M
Board Layout and Bypassing
The MAX9015
–
MAX9020 ultra-low supply current typi-
cally requires no power-supply bypass capacitors.
However, when the supply has high output impedance,
long lead lengths or excessive noise, or fast transients,
bypass V
CC
to V
EE
with a 0.1μF capacitor placed as
close to the V
CC
pin as possible. Minimize signal trace
lengths to reduce stray capacitance. Use a ground
plane and surface-mount components for best perfor-
mance. If REF is decoupled, use a low-leakage ceram-
ic capacitor.
Window Detector
The MAX9018 is ideal for window detectors (undervolt-
age/overvoltage detectors). Figure 4 shows a window
detector circuit for a single-cell Li+ battery with a 2.9V
end-of-life charge, a peak charge of 4.2V, and a nomi-
nal value of 3.6V. Choose different thresholds by
changing the values of R1, R2, and R3. OUTA provides
an active-low undervoltage indication, and OUTB pro-
vides an active-low overvoltage indication. ANDing the
two open-drain outputs provides an active-high, power-
good signal.
The design procedure is as follows:
1) Select R1. The input bias current into INB- is nor-
mally less than 2nA, so the current through R1
should exceed 100nA for the thresholds to be accu-
rate. In this example, choose R1 = 1.24M
(1.24V/1μA).
2) Calculate R2 + R3. The overvoltage threshold
should be 4.2V when V
IN
is rising. The design
equation is as follows:
=2.95M
3) Calculate R2. The undervoltage threshold should
be 2.9V when V
IN
is falling. The design equation is
as follows:
= 546k
For this example, choose a 499k
standard value 1%
resistor.
4) Calculate R3:
R3 = (R2 + R3) - R2
= 2.95M
- 546k
= 240M
5) Verify the resistor values. The equations are as fol-
lows, evaluated for the above example:
Overvoltage threshold:
Undervoltage threshold:
where the internal hysteresis band, V
HB
, is 4mV.
Zero-Crossing Detector
Figure 5 shows a zero-crossing detector application.
The MAX9015/MAX9016/MAX9019/MAX9020s
’
invert-
ing input is connected to ground, and its noninverting
input is connected to a 100mV
P-P
signal source. As the
signal at the noninverting input crosses zero, the com-
parator
’
s output changes state.
V
V
V
x
R
(
R
+
R
)
R
(
R
V
UTH
REF
HB
=
+
+
2
=
(
)
)
.
1
2
3
1
2 97
V
V
V
x
R
(
R
R
R
V
OTH
REF
HB
=
+
+
+
=
(
)
)
.
1
2
1
3
4 20
=
+
M
1 24
.
)
1 236
2 9
)
.
.
2 95
1 24
M
x
M
R
R
(
R
R
x
V
V
V
R
REF
HB
UTH
2
1
2
3
1
=
+
+
)
=
+
1 24
.
4 2
.
V
1 24
.
0 004
.
1
M
x
V
R
R
R x
1
V
V
V
OTH
+
REF
HB
2
3
1
+
=
SOT23, Dual, Precision, 1.8V, Nanopower
Comparators With/Without Reference
14
______________________________________________________________________________________
MAX9018
V
CC
INA+
OUTA
V
EE
REF/INA-
REF
1.24V
INB+
INB-
OUTB
V
EE
V
IN
V
OTH
= 4.2V
V
UTH
= 2.9V
R3
R2
R1
5V
POWER-
Figure 4. Window Detector Circuit
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