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參數(shù)資料
| 型號： | MAX934 |
| 廠商： | Maxim Integrated Products, Inc. |
| 英文描述： | Ultra Low-Power, Low-Cost Comparators with 2eference |
| 中文描述： | 超低功耗、低成本比較器、內(nèi)置2%電壓基準 |
| 文件頁數(shù)： | 12/16頁 |
| 文件大?。?/td> | 164K |
| 代理商： | MAX934 |
100nA for the thresholds to be accurate. R1 values
up to about 10M
can be used, but values in the
100k
to 1M
range are usually easier to deal with.
In this example, choose R1 = 294k
.
3. Calculate R2 + R3. The overvoltage threshold
should be 5.5V when V
IN
is rising. The design
equation is as follows:
V
V
REF
=
4. Calculate R2. The undervoltage threshold should
be 4.5V when V
IN
is falling. The design equation is
as follows:
5. Calculate R3.
6. Verify the resistor values. The equations are as
follows, evaluated for the above example.
Overvoltage threshold:
Bar-Graph Level Gauge
The high output source capability of the MAX931 series
is useful for driving LEDs. An example of this is the
simple four-stage level detector shown in Figure 7.
The full-scale threshold (all LEDs on) is given by
V
IN
= (R1 + R2)/R1 volts. The other thresholds are at
3/4 full scale, 1/2 full scale, and 1/4 full scale. The
output resistors limit the current into the LEDs.
Level S hifter
Figure 8 shows a circuit to shift from bipolar ±5V inputs
to TTL signals. The 10k
resistors protect the
comparator inputs, and do not materially affect the
operation of the circuit.
T wo-S tage Low-V oltage Detec tor
Figure 9 shows the MAX932 monitoring an input
voltage in two steps. When V
IN
is higher than the
LOW and FAIL thresholds, outputs are high. Threshold
calculations are similar to those for the window-
detector application.
V
(V
V )
(R1
R2
R1
R3)
Undervoltage threshold:
5.474V.
V
(V
V )
(R1
R2
R3)
(R1 + R2)
4.484V,
where the hysteresis voltage V
V
R5
R4
OTH
REF
UTH
REF
REF
=
+
×
+
+
=
=
×
+
+
=
=
×
.
R3
(R2 + R3)
.068M
1.006M
1M (1% standard value).
R2
1 9
.
6
k
Choose R3
=
=
=
=
1
R2
(R1 + R2 + R3)
(V
V )
V
R1
(294k + 1.068M)
(1.182
0.005)
4.5
294k
62.2k
Choose R2
61.9k (1% standard value).
REF
UTH
=
×
=
×
=
=
R2
R3
R1
V
1
294k
5.5
+
(1.182
0.005)
1
1.068M
OTH
H
+
=
×
+
=
×
M
Ultra Low-Power, Low-Cost
Comparators with 2% Referenc e
12
______________________________________________________________________________________
INB+
INB-
INC+
INC-
IND+
IND-
INA+
INA-
OUTA
OUTB
OUTC
OUTD
5
4
7
6
11
10
13
12
750mV
1V
500mV
250mV
250k
250k
250k
250k
182k
9
2
1
16
15
REF
8
V-
V+
GND
14
MAX934
3
+5V
IN
R1
R2
1.182V
330
330
330
330
Figure 7. Bar-Graph Level Gauge
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PDF描述 |
|---|---|
| MAX934CPE | Ultra Low-Power, Low-Cost Comparators with 2eference |
| MAX934CSE | Ultra Low-Power, Low-Cost Comparators with 2eference |
| MAX934EPE | Ultra Low-Power, Low-Cost Comparators with 2eference |
| MAX934ESE | Ultra Low-Power, Low-Cost Comparators with 2eference |
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX934CPE | 功能描述:校驗器 IC Comparator w/2% Reference 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 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX934CPE+ | 功能描述:校驗器 IC Comparator w/2% Reference 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 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX934CSE | 功能描述:校驗器 IC Comparator w/2% Reference 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 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX934CSE+ | 功能描述:校驗器 IC Comparator w/2% Reference 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 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX934CSE+T | 功能描述:校驗器 IC Comparator w/2% Reference 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 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
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