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参数资料
| 型号： | MAX977EEE+T |
| 厂商： | Maxim Integrated Products |
| 文件页数： | 6/17页 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR DUAL 16-QSOP |
| 产品培训模块： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 标准包装： | 2,500 |
| 类型： | 通用 |
| 元件数： | 2 |
| 输出类型： | CMOS，满摆幅，TTL |
| 电压 - 电源，单路/双路(±)： | 2.7 V ~ 5.25 V |
| 电压 - 输入偏移（最小值）： | 2mV @ 5V |
| 电流 - 输入偏压（最小值）： | 0.1µA @ 5.25V |
| 电流 - 静态（最大值）： | 500µA |
| CMRR, PSRR（标准）： | 82dB CMRR，90dB PSRR |
| 传输延迟（最大）： | 820ns |
| 磁滞： | 4mV |
| 工作温度： | -40°C ~ 85°C |
| 封装/外壳： | 16-SSOP（0.154"，3.90mm 宽） |
| 安装类型： | 表面贴装 |
| 包装： | 带卷 (TR) |
MAX975/MAX977
Window Comparator
The MAX977 is ideal for making a window detector
(undervoltage/overvoltage detector). The schematic
shown in Figure 5 uses a MAX6120 reference and com-
ponent values selected for a 2.0V undervoltage thresh-
old and a 2.5V overvoltage threshold. Choose different
thresholds by changing the values of R1, R2, and R3.
OUTA provides an active-low undervoltage indication,
and OUTB gives an active-low overvoltage indication.
ANDing the two outputs provides an active-high,
power-good signal. The design procedure is as follows:
1) Select R1. The leakage current into INB- is normally
100nA, so the current through R1 should exceed
10A for the thresholds to be accurate. R1 values in
the 50k
to 100k range are typical.
2) Choose the overvoltage threshold (VOTH) when VIN
is rising, and calculate R2 and R3 with the following
formula:
R2 + R3 = R1 x [VOTH / (VREF + VH) - 1]
where VH = 1/2VHYST.
3) Choose the undervoltage threshold (VUTH) when VIN is
falling, and calculate R2 with the following formula:
R2 = (R1 + R2 + R3) x [(VREF - VH) / VUTH] - R1
where VH = 1/2VHYST.
4) Calculate R3 with the following formula:
R3 = (R2 + R3) - R2
5) Verify the resistor values. The equations are as
follows:
VOTH = (VREF + VH) x (R1 + R2 + R3) / R1
VUTH = (VREF - VH) x (R1 + R2 + R3) / (R1 + R2)
Toll-Tag Circuit
The circuit shown in Figure 6 uses a MAX975 in a very
low standby-power AM demodulator circuit that wakes
up a toll tag (part of an automated roadway toll-
collection system). This application requires very long
standby times with brief and infrequent interrogations.
In the awake state, it is capable of demodulating the
typical 600kHz AM carrier riding on the 2.4GHz RF sig-
nal. In this state, the comparator draws its 250A high-
speed current. After communications have ceased, or
when instructed by the microcontroller, the comparator
returns to its low-power state. The comparator draws
only 3
A in this state, while monitoring for RF activity.
Typically, this application requires two comparators
and a discrete power-management and signal-
switchover circuit. The MAX975 circuit is smaller, sim-
pler, less costly, and saves design time.
Single/Dual, +3V/+5V Dual-Speed
Comparators with Auto-Standby
14
______________________________________________________________________________________
6
1
3
7
10
R3
VCC
VIN
5
R2
24.9k
, 1%
R1
100k
, 1%
82.1k
, 1%
2
11
9
OVERVOLTAGE
(PIN NUMBERS SHOWN ARE FOR QSOP PACKAGE)
UNDERVOLTAGE
POWER GOOD
CSTOB
1/2
MAX977
MAX6120
14
15
2
VCC
4
3
1
CSTOA
0.1
F
1/2
MAX977
Figure 5. Window Comparator
I/0
WAKE-UP IRQ
3V
0.1
F
P
0.1
F
1M
4.7k
GND
STAT
LP
STO
CSTO
VCC
50
X-BAND
DETECTOR
MAX975
Figure 6. Toll-Tag Reader
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相关代理商/技术参数 |
参数描述 |
|---|---|
| MAX977ESD | 功能描述:校验器 IC 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 |
| MAX977ESD+ | 功能描述:校验器 IC 3V/5V Dual-Speed Comparator 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 |
| MAX977ESD+T | 功能描述:校验器 IC 3V/5V Dual-Speed Comparator 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 |
| MAX977ESD-T | 功能描述:校验器 IC 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 |
| MAX9787ETI+ | 功能描述:音频放大器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 产品:General Purpose Audio Amplifiers 输出类型:Digital 输出功率: THD + 噪声: 工作电源电压:3.3 V 电源电流: 最大功率耗散: 最大工作温度: 安装风格:SMD/SMT 封装 / 箱体:TQFP-64 封装:Reel |
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