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参数资料
| 型号： | MAX931ESA+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/16页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR W/REF 8-SOIC |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 带电压基准 |
| 元件数： | 1 |
| 输出类型： | CMOS，TTL |
| 电压 - 电源，单路/双路(±)： | 2.5 V ~ 11 V，±1.25 V ~ 5.5 V |
| 电压 - 输入偏移（最小值）： | 10mV @ 5V |
| 电流 - 输出（标准）： | 0.015mA @ 5V |
| 电流 - 静态（最大值）： | 4µA |
| CMRR, PSRR（标准）： | 80dB CMRR，80dB PSRR |
| 传输延迟（最大）： | 12µs |
| 磁滞： | 50mV |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 8-SOIC（0.154"，3.90mm 宽） |
| 安装类型： | 表面贴装 |
| 包装： | 带卷 (TR) |
MAX931-MAX934
maximum difference between REF and HYST (50mV)
will therefore produce a 100mV max hysteresis band.
Use the following equations to determine R1 and R2:
Where IREF (the current sourced by the reference)
should not exceed the REF source capability, and
should be significantly larger than the HYST input
current. IREF values between 0.1A and 4A are
usually appropriate. If 2.4M
is chosen for
R2 (IREF = 0.5A), the equation for R1 and VHB can be
approximated as:
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 VREF/R3,
or 100nA for R3 = 11.8M
. 10M is a good
practical value.
2. Choose the hysteresis voltage (VHB), the voltage
between the upper and lower thresholds. In this
example, choose VHB = 50mV.
3. Calculate R1.
4. Choose the threshold voltage for VIN rising (VTHR). In
this example, choose VTHR = 3V.
5. Calculate R2.
A 1% preferred value is 64.9k
.
6. Verify the threshold voltages with these formulas:
V
rising :
V
R1
1
R1
1
R2
1
R3
V
falling :
V
R1
V
R3
IN
THR
REF
IN
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
V
10M
0.05
5
100k
HB
×
+
=×
=
R1 (k ) = V
(mV)
HB
R1 =
V
2
I
R2 =
1.182 –
V
2
I
HB
REF
HB
REF
×
()
Ultra Low-Power, Low-Cost
Comparators with 2% Reference
10
______________________________________________________________________________________
GND
V-
V+
MAX934
OUT
R3
R1
R2
VREF
VIN
V+
Figure 4. External Hysteresis
7
2
5
6
HYST
REF
V-
V+
R1
R2
MAX931
MAX932
MAX933
2.5V TO 11V
IREF
Figure 3. Programming the HYST Pin
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PDF描述 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX931ESA-TG068 | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9320AEKA | 制造商:Maxim Integrated Products 功能描述:1:2 DIFFERENTIAL LVPECL/LVECL/HSTL - Rail/Tube |
| MAX9320AEKA-T | 制造商:Maxim Integrated Products 功能描述:1:2 DIFFERENTIAL LVPECL/LVECL/HSTL CLOCK AND - Tape and Reel |
| MAX9320BESA | 制造商:Rochester Electronics LLC 功能描述: 制造商:Maxim Integrated Products 功能描述: |
| MAX9320BESA+ | 制造商:Maxim Integrated Products 功能描述:LINE TRANSMITTER 1TX 8SOIC N - Rail/Tube |
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