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參數(shù)資料
| 型號(hào)： | MAX932CUA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 模擬信號(hào)調(diào)理 |
| 英文描述： | Ultra Low-Power, Low-Cost Comparators with 2eference |
| 中文描述： | SPECIALTY ANALOG CIRCUIT, PDSO8 |
| 封裝： | UMAX-8 |
| 文件頁數(shù)： | 10/16頁 |
| 文件大?。?/td> | 164K |
| 代理商： | MAX932CUA |
M
maximum difference between REF and HYST (50mV)
will therefore produce a 100mV max hysteresis band.
Use the following equations to determine R1 and R2:
V
2
I
REF
×
Where I
REF
(the current sourced by the reference)
should not exceed the REF source capability, and
should be significantly larger than the HYST input
current. I
REF
values between 0.1μA and 4μA are
usually appropriate. If 2.4M
is chosen for
R2 (I
REF
= 0.5μA), the equation for R1 and V
HB
can be
approximated as:
R1 (k ) = V
(mV)
HB
When hysteresis is obtained in this manner for
the MAX932/MAX933, the same hysteresis applies to
both comparators.
Hysteresis (MAX934)
Hysteresis can be set with two resistors using positive
feedback, as shown in Figure 4. This circuit generally
draws more current than the circuits using the HYST
pin on the MAX931/MAX932/MAX933, and the high
feedback impedance slows hysteresis. The design
procedure is as follows:
1. Choose R3. The leakage current of IN+ is under 1nA
(up to +85°C), so the current through R3 can be
around 100nA and still maintain good accuracy.
The current through R3 at the trip point is V
REF
/R3,
or 100nA for R3 = 11.8M
. 10M
is a good
practical value.
2. Choose the hysteresis voltage (V
HB
), the voltage
between the upper and lower thresholds. In this
example, choose V
HB
= 50mV.
3. Calculate R1.
V
V
0.05
5
100k
=
4. Choose the threshold voltage for V
IN
rising (V
THR
). In
this example, choose V
THR
= 3V.
5. Calculate R2.
1
A 1% preferred value is 64.9k
.
6. Verify the threshold voltages with these formulas:
V rising :
V
V
R1
1
R1
1
R2
1
R3
V falling :
V
V
R1
(
V
R3
THR
REF
THF
THR
=
×
×
+
+
=
×
+
)
R2 =
V
(V
1
R1
1
R3
3
×
(1.182
100k)
1
100k
1
10M
65.44k
THR
×
REF
R1)
1
=
=
R1 = R3
10M
HB
+
×
=
×
R1 =
R2 =
1.182 ± V
2
I
HB
HB
REF
(
)
Ultra Low-Power, Low-Cost
Comparators with 2% Referenc e
10
______________________________________________________________________________________
GND
V-
V+
MAX934
OUT
R3
R1
R2
V
REF
V
IN
V+
Figure 4. External Hysteresis
7
2
5
6
HYST
REF
V-
V+
R1
R2
MAX931
MAX932
MAX933
2.5V TO11V
I
REF
Figure 3. Programming the HYST Pin
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX932CUA+ | 功能描述:校驗(yàn)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(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 |
| MAX932CUA+T | 功能描述:校驗(yàn)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(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 |
| MAX932CUA-T | 功能描述:校驗(yàn)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(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 |
| MAX932EPA | 功能描述:校驗(yàn)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(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 |
| MAX932EPA+ | 功能描述:校驗(yàn)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(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 |
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