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參數(shù)資料
| 型號(hào)： | MAX923EPA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Ultra Low-Power, Single/Dual-Supply Comparators |
| 中文描述： | DUAL COMPARATOR, 10000 uV OFFSET-MAX, 14000 ns RESPONSE TIME, PDIP8 |
| 封裝： | PLASTIC, DIP-8 |
| 文件頁(yè)數(shù)： | 12/16頁(yè) |
| 文件大?。?/td> | 139K |
| 代理商： | MAX923EPA |
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M
Ultra Low-Power,
S ingle/Dual-S upply Comparators
12
______________________________________________________________________________________
2. Select R1. The leakage current into INB- is normally
under 1nA, so the current through R1 should
exceed 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:
(V
=
×
5. Calculate R3.
R3
=
=
=
Choose R3 = 1M
(1% standard value)
6. Verify the resistor values. The equations are as
follows, evaluated for the above example.
Overvoltage threshold :
(R1
OTH
REF
=
+
×
Bar-Graph Level Gauge
The high output source capability of the MAX921 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.
V
(V
V )
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
UTH
REF
H
REF
+
+
=
=
×
+
+
=
=
×
.
(R2 + R3)
.068M
1.006M
R2
1 9
.
6
k
1
R2
(R1 + R2 + R3)
V )
H
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
+
=
×
+
=
×
MAX923
INB-
REF
HYST
INA+
V-
V+
OUTA
OUTB
10k
R5
2.4M
R1
R2
R3
UNDERVOLTAGE
POWER GOOD
OVERVOLTAGE
V
IN
V
OTH
= 5.5V
V
UTH
= 4.5V
R4
+5V
Figure 6. Window Detector
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX923EPA+ | 功能描述:校驗(yàn)器 IC Dual Comparator w/1% Precision Ref 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(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX923ESA | 功能描述:校驗(yàn)器 IC Dual Comparator w/1% Precision Ref 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(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX923ESA+ | 功能描述:校驗(yàn)器 IC Dual Comparator w/1% Precision Ref 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(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX923ESA+T | 功能描述:校驗(yàn)器 IC Dual Comparator w/1% Precision Ref 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(bǔ)償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應(yīng)時(shí)間: 最大工作溫度:+ 125 C 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX923ESA-LF | 制造商:Maxim Integrated Products 功能描述: |
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