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參數(shù)資料
| 型號(hào)： | MAX975EUA |
| 廠商： | Maxim Integrated Products |
| 文件頁數(shù)： | 6/17頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC COMPARATOR SNGL 3V/5V 8-UMAX |
| 產(chǎn)品培訓(xùn)模塊： | Lead (SnPb) Finish for COTS Obsolescence Mitigation Program |
| 標(biāo)準(zhǔn)包裝： | 50 |
| 類型： | 通用 |
| 元件數(shù)： | 1 |
| 輸出類型： | CMOS，滿擺幅，TTL |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 5.25 V |
| 電壓 - 輸入偏移（最小值）： | 2mV @ 5V |
| 電流 - 輸入偏壓（最小值）： | 0.1µA @ 5.25V |
| 電流 - 靜態(tài)（最大值）： | 500µA |
| CMRR, PSRR（標(biāo)準(zhǔn)）： | 82dB CMRR，90dB PSRR |
| 傳輸延遲（最大）： | 820ns |
| 磁滯： | 4mV |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 8-TSSOP，8-MSOP（0.118"，3.00mm 寬） |
| 安裝類型： | 表面貼裝 |
| 包裝： | 管件 |
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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PDF描述 |
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| MAX923CSA+T | IC COMPARATOR W/REF 8-SOIC |
| MAX973CSA+T | IC COMPARATOR OD 8-SOIC |
| VE-J5M-MY-F1 | CONVERTER MOD DC/DC 10V 50W |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| MAX975EUA+ | 功能描述:校驗(yàn)器 IC 3V/5V Dual Speed Comparator 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 |
| MAX975EUA+T | 功能描述:校驗(yàn)器 IC 3V/5V Dual Speed Comparator 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 |
| MAX975EUA-T | 功能描述:校驗(yàn)器 IC 3V/5V Dual Speed Comparator 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 |
| MAX9760ETI | 功能描述:音頻放大器 RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
| MAX9760ETI+ | 功能描述:音頻放大器 Integrated Circuits (ICs) RoHS:否 制造商:STMicroelectronics 產(chǎn)品:General Purpose Audio Amplifiers 輸出類型:Digital 輸出功率: THD + 噪聲: 工作電源電壓:3.3 V 電源電流: 最大功率耗散: 最大工作溫度: 安裝風(fēng)格:SMD/SMT 封裝 / 箱體:TQFP-64 封裝:Reel |
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