- 您现在的位置：买卖IC网 > PDF目录10643 > MAX923EPA+ (Maxim Integrated Products)IC COMPARATOR W/REF 8-DIP PDF资料下载
参数资料
| 型号： | MAX923EPA+ |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 2/17页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR W/REF 8-DIP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 50 |
| 类型： | 带电压基准 |
| 元件数： | 2 |
| 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）： | 50mA |
| 电流 - 静态（最大值）： | 7.5µA |
| 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-DIP（0.300"，7.62mm） |
| 安装类型： | 通孔 |
| 包装： | 管件 |
| 产品目录页面： | 1386 (CN2011-ZH PDF) |
MAX921–MAX924
comparator is used with the reference, the combined
peak-to-peak noise is about 1mV. This, of course, is
much higher than the RMS noise of the individual
components. Care should be taken in the layout to
avoid capacitive coupling from any output to the
reference pin. Crosstalk can significantly increase the
actual noise of the reference.
__________Applications Information
Hysteresis
Hysteresis increases the comparators’ noise margin by
increasing the upper threshold and decreasing the
lower threshold (see Figure 2).
Hysteresis (MAX921/MAX923)
To add hysteresis to the MAX921 or MAX923, connect
resistor R1 between REF and HYST, and connect
resistor R2 between HYST and V- (Figure 3). If no
hysteresis is required, connect HYST to REF. When
hysteresis is added, the upper threshold increases by
the same amount that the lower threshold decreases.
The hysteresis band (the difference between the upper
and lower thresholds, VHB) is approximately equal to
twice the voltage between REF and HYST. The HYST
input can be adjusted to a maximum voltage of REF
and to a minimum voltage of (REF – 50mV). The
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
Ω 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
MAX923, the same hysteresis applies to both comparators.
Hysteresis (MAX922/MAX924)
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 MAX921 and MAX923, 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
Ω. 10MΩ 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
Ω.
R2 =
V
(V
1
R1
1
R3
3
(1.182
100k)
1
100k
1
10M
65.44k
THR
REF
R1)
1
×
=
×
=
Ω
R1 = R3
V
10M
0.05
5
100k
HB
×
+
=×
=Ω
R1 (k ) = V
(mV)
HB
Ω
R1 =
V
2
I
R2 =
1.182 –
V
2
I
HB
REF
HB
REF
×
()
Ultra Low-Power,
Single/Dual-Supply Comparators
10
______________________________________________________________________________________
GND
V-
V+
MAX924
OUT
R3
R1
R2
VREF
VIN
V+
Figure 4. External Hysteresis
相关PDF资料 |
PDF描述 |
|---|---|
| VE-213-IW-F2 | CONVERTER MOD DC/DC 24V 100W |
| MAX3226EETE+ | IC TXRX RS232 250KBPS SD 16TQFN |
| MAX9691EPA+ | IC COMPARATOR W/LE 8-DIP |
| VI-J51-MY-F4 | CONVERTER MOD DC/DC 12V 50W |
| MAX9691EUA+ | IC COMPARATOR W/LE 8-UMAX |
相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX923EPA+ | 功能描述:校验器 IC Dual Comparator w/1% Precision Ref RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX923ESA | 功能描述:校验器 IC Dual Comparator w/1% Precision Ref RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX923ESA+ | 功能描述:校验器 IC Dual Comparator w/1% Precision Ref RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX923ESA+T | 功能描述:校验器 IC Dual Comparator w/1% Precision Ref RoHS:否 制造商:STMicroelectronics 产品: 比较器类型: 通道数量: 输出类型:Push-Pull 电源电压-最大:5.5 V 电源电压-最小:1.1 V 补偿电压（最大值）:6 mV 电源电流（最大值）:1350 nA 响应时间: 最大工作温度:+ 125 C 安装风格:SMD/SMT 封装 / 箱体:SC-70-5 封装:Reel |
| MAX923ESA-LF | 制造商:Maxim Integrated Products 功能描述: |
发布紧急采购，3分钟左右您将得到回复。