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參數(shù)資料
| 型號： | MAX991ESA |
| 廠商： | MAXIM INTEGRATED PRODUCTS INC |
| 元件分類： | 運動控制電子 |
| 英文描述： | Wirewound Potentiometer; Series:LW; Track Resistance:1ohm; Resistance Tolerance:+/- 10%; Power Rating:5W; Operating Temperature Range:-30 C to +105 C; Resistor Element Material:Wirewound; Adjustment Type:Knob; No. of Turns:1 RoHS Compliant: Yes |
| 中文描述： | DUAL COMPARATOR, 7000 uV OFFSET-MAX, 210 ns RESPONSE TIME, PDSO8 |
| 封裝： | 0.150 INCH, SOIC-8 |
| 文件頁數(shù)： | 8/12頁 |
| 文件大?。?/td> | 141K |
| 代理商： | MAX991ESA |
_______________Detailed Desc ription
The MAX987/MAX988/MAX991/MAX992/MAX995/
MAX996 are single/dual/quad low-power, low-voltage
comparators. They have an operating supply voltage
range between +2.5V and +5.5V and consume only
48μA per comparator, while achieving 120ns propaga-
tion delay. Their common-mode input voltage range
extends 0.25V beyond each rail. Internal hysteresis
ensures clean output switching, even with slow-moving
input signals. Large internal output drivers allow rail-to-
rail output swing with up to 8mA loads.
The output stage employs a unique design that mini-
mizes supply-current surges while switching, virtually
eliminating the supply glitches typical of many other
comparators. The MAX987/MAX991/MAX995 have a
push/pull output structure that sinks as well as sources
current. The MAX988/MAX992/MAX996 have an open-
drain output stage that can be pulled beyond V
CC
to an
absolute maximum of 6V above V
EE
.
Input S tage Circ uitry
The devices’ input common-mode range extends from
-0.25V to (V
CC
+ 0.25V). These comparators may oper-
ate at any differential input voltage within these limits.
Input bias current is typically 1.0pA if the input voltage
is between the supply rails. Comparator inputs are pro-
tected from overvoltage by internal body diodes con-
nected to the supply rails. As the input voltage exceeds
the supply rails, these body diodes become forward
biased and begin to conduct. Consequently, bias cur-
rents increase exponentially as the input voltage
exceeds the supply rails.
Output S tage Circ uitry
These comparators contain a unique output stage
capable of rail-to-rail operation with up to 8mA loads.
Many comparators consume orders of magnitude more
current during switching than during steady-state oper-
ation. However, with this family of comparators, the
supply-current change during an output transition is
extremely small. The Typical Operating Characteristics
graph Supply Current vs. Output Transition Frequency
shows the minimal supply-current increase as the out-
put switching frequency approaches 1MHz. This char-
acteristic eliminates the need for power-supply filter
capacitors to reduce glitches created by comparator
switching currents. Battery life increases substantially
in high-speed, battery-powered applications.
__________Applic ations Information
Additional Hysteresis
MAX987/MAX991/MAX995
The MAX987/MAX991/MAX995 have ±2.5mV internal
hysteresis. Additional hysteresis can be generated with
three resistors using positive feedback (Figure 1).
Unfortunately, this method also slows hysteresis
response time. Use the following procedure to calcu-
late resistor values for the MAX987/MAX991/MAX995.
1) Select R3. Leakage current at IN is under 10nA;
therefore, the current through R3 should be at least
1μA to minimize errors caused by leakage current.
The current through R3 at the trip point is (V
REF
-
V
OUT
) / R3. Considering the two possible output
states and solving for R3 yields two formulas: R3 =
V
REF
/ 1μA or R3 = (V
REF
- V
CC
) / 1μA. Use the
smaller of the two resulting resistor values. For
example, if V
REF
= 1.2V and V
CC
= 5V, then the two
R3 resistor values are 1.2M
and 3.8M
. Choose a
1.2M
standard value for R3.
2) Choose the hysteresis band required (V
HB
). For this
example, choose 50mV.
3) Calculate R1 according to the following equation:
R1 = R3 x (V
HB
/ V
CC
)
For this example, insert the values R1 = 1.2M
x
(50mV / 5V) = 12k
.
4) Choose the trip point for V
IN
rising (V
THR
; V
THF
is
the trip point for V
IN
falling). This is the threshold
voltage at which the comparator switches its output
from low to high as V
IN
rises above the trip point. For
this example, choose 3V.
M
High-S peed, Mic ropower, Low-Voltage,
S OT 23, Rail-to-Rail I/O Comparators
V
CC
MAX987
MAX991
MAX995
OUT
0.1
μ
F
R3
R1
R2
V
REF
V
EE
V
IN
V
CC
Figure 1. Additional Hysteresis (MAX987/MAX991/MAX995)
8
_______________________________________________________________________________________
相關PDF資料 |
PDF描述 |
|---|---|
| MAX992ESA | Wirewound Potentiometer; Series:LW; Track Resistance:50ohm; Resistance Tolerance:+/-10%; Power Rating:5W; Operating Temperature Range:-30 C to +105 C; Resistor Element Material:Wirewound; Adjustment Type:Knob; No. of Turns:1 RoHS Compliant: Yes |
| MAX992EUA | Wirewound Potentiometer; Series:M; Track Resistance:10ohm; Resistance Tolerance:+/- 10%; Power Rating:4W; Operating Temperature Range:-55 C to +105 C; Resistor Element Material:Wirewound; Adjustment Type:Knob; No. of Turns:1 RoHS Compliant: Yes |
| MAX9981EVKIT | Evaluation Kit for the MAX9981 |
| MAX963 | Low-Noise.Precision Op Amp[MXL1007/MXL1007ACN8/MXL1007AMH/MXL1007AMJ8/MXL1007CN8/MXL1007CS/MXL1007CS-T/MXL1007CS8/MXL1007CS8-T/MXL1007MH/MXL1007MJ8 ] |
| MAX990 | Micropower.Low-Voltage.UCSP/SC70.Rail-to-Rail I/O Comparators |
相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| MAX991ESA+ | 功能描述:校驗器 IC Dual uPower Comparator RoHS:否 制造商:STMicroelectronics 產品: 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 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX991ESA+T | 功能描述:校驗器 IC Dual uPower Comparator RoHS:否 制造商:STMicroelectronics 產品: 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 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX991ESA-T | 功能描述:校驗器 IC Dual uPower Comparator RoHS:否 制造商:STMicroelectronics 產品: 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 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX991EUA | 功能描述:校驗器 IC Dual uPower Comparator RoHS:否 制造商:STMicroelectronics 產品: 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 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
| MAX991EUA+ | 功能描述:校驗器 IC Dual uPower Comparator RoHS:否 制造商:STMicroelectronics 產品: 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 補償電壓（最大值）:6 mV 電源電流（最大值）:1350 nA 響應時間: 最大工作溫度:+ 125 C 安裝風格:SMD/SMT 封裝 / 箱體:SC-70-5 封裝:Reel |
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