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參數(shù)資料
| 型號(hào)： | LTC1540CMS8 |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運(yùn)動(dòng)控制電子 |
| 英文描述： | Nanopower Comparator with Reference |
| 中文描述： | COMPARATOR, 16000 uV OFFSET-MAX, 70000 ns RESPONSE TIME, PDSO8 |
| 封裝： | PLASTIC, MSOP-8 |
| 文件頁(yè)數(shù)： | 7/12頁(yè) |
| 文件大?。?/td> | 247K |
| 代理商： | LTC1540CMS8 |
7
LTC1540
APPLICATIO
S I
FOR
ATIO
U
Hysteresis
Hysteresis can be added to the LTC1540 by connecting a
resistor (R1) between the REF and HYST pins and a
second resistor (R2) from HYST to V
–
(Figure 5).
The difference between the upper and lower threshold
voltages, or hysteresis voltage band (V
HB
), is equal to twice
the voltage difference between the REF and HYST pins.
When more hysteresis is added, the upper threshold
increases the same amount as the low threshold de-
creases. The maximum voltage allowed between REF and
HYST pins is 50mV, producing a maximum hysteresis
voltage band of 100mV. The hysteresis band may vary by
W
U
U
up to 15%. If hysteresis is not wanted, the HYST pin
should be shorted to REF. Acceptable values for I
REF
range
from 0.1
μ
A to 5
μ
A. If 2.4M is chosen for R2, then the value
of R1 (k
) is equal to the value of V
HB
(mV).
6
R2
HYST
V
–
REF
5
R1
1540 F05
LTC1540
2
I
REF
R1 =
V
HB
(2)(I
REF
)
(
R2 =
I
REF
1.182V –
)
V
HB
2
Figure 5. Programmable Hysteresis
Figure 6. Glitch-Free Level Detector with Hysteresis
TYPICAL APPLICATIO
N
S
Level Detector
The LTC1540 is ideal for use as a nanopower level detector
as shown in Figure 6. R1 and R2 form a voltage divider
from V
IN
to the noninverting comparator input. R3 and R4
set the hysteresis voltage, and R5 and C1 bypass the
reference output. The following design procedure can be
used to select the component values:
1. Choose the V
IN
voltage trip level, in this example 4.65V.
2. Calculate the required resistive divider ratio.
Ratio = V
REF
/V
IN
Ratio = 1.182V/4.65V = 0.254
3. Choose the required hysteresis voltage band at the
input V
HBIN
, in this example 60mV. Calculate the hyster-
esis voltage band referred to the comparator input V
HB
.
V
HB
= (V
HBIN
)(Ratio)
V
HB
= (60mV)(0.254)
V
HB
= 15.24mV
4. Choose the values for R3 and R4 to set the hysteresis.
R4 = 2.4M
R3 (k
) = 15k, V
HB
(mV) = 15mV
5. Choose the values for R1 and R2 to set the trip point.
R1 =
R2 = R1
– 1
=
= 1.18M
V
REF
I
BIAS
V
REF
+
V
IN
V
HB
2
1.182V
1
μ
A
R2 = 1.18M
R2 = 3.40M
– 1
1.182V +
4.65V
15mV
2
V
+
R5
430
5%
C1
1
μ
F
R3
15k
1%
OUT
V
–
2
1
7
5V
V
IN
8
GND
LTC1540
1540 F06
IN
+
IN
–
HYST
REF
3
4
5
6
–
+
R2
3.4M
1%
R1
1.18M
1%
R4
2.4M
1%
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相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LTC1540CMS8#PBF | 功能描述:IC COMP NANOPOWER W/REF 8-MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 標(biāo)準(zhǔn)包裝:1 系列:- 類型:通用 元件數(shù):1 輸出類型:CMOS，開(kāi)路集電極，TTL 電壓 - 電源，單路/雙路(±):2.7 V ~ 5.5 V 電壓 - 輸入偏移（最小值）:7mV @ 5V 電流 - 輸入偏壓（最小值）:0.25µA @ 5V 電流 - 輸出（標(biāo)準(zhǔn)）:84mA @ 5V 電流 - 靜態(tài)（最大值）:120µA CMRR, PSRR（標(biāo)準(zhǔn)）:- 傳輸延遲（最大）:600ns 磁滯:- 工作溫度:-40°C ~ 85°C 封裝/外殼:SC-74A，SOT-753 安裝類型:表面貼裝 包裝:剪切帶 (CT) 產(chǎn)品目錄頁(yè)面:1268 (CN2011-ZH PDF) 其它名稱:*LMV331M5*LMV331M5/NOPBLMV331M5CT |
| LTC1540CMS8#PBF | 制造商:Linear Technology 功能描述:Micropower Comparator IC 制造商:Linear Technology 功能描述:IC, MICROPOWER COMP, SINGLE, 50 uS MSOP-8 |
| LTC1540CMS8#TR | 功能描述:IC COMPARATOR 2% VOLT REF 8MSOP RoHS:否 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 標(biāo)準(zhǔn)包裝:25 系列:- 類型:帶電壓基準(zhǔn) 元件數(shù):4 輸出類型:CMOS，開(kāi)路漏極，TTL 電壓 - 電源，單路/雙路(±):2 V ~ 11 V，±1 V ~ 5.5 V 電壓 - 輸入偏移（最小值）:10mV @ 5V 電流 - 輸入偏壓（最小值）:- 電流 - 輸出（標(biāo)準(zhǔn)）:0.015mA @ 5V 電流 - 靜態(tài)（最大值）:8.5µA CMRR, PSRR（標(biāo)準(zhǔn)）:80dB CMRR，80dB PSRR 傳輸延遲（最大）:12µs 磁滯:50mV 工作溫度:0°C ~ 70°C 封裝/外殼:16-DIP（0.300"，7.62mm） 安裝類型:通孔 包裝:管件 |
| LTC1540CMS8#TRPBF | 功能描述:IC COMP NANOPOWER W/REF 8-MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:- 標(biāo)準(zhǔn)包裝:25 系列:- 類型:帶電壓基準(zhǔn) 元件數(shù):4 輸出類型:CMOS，開(kāi)路漏極，TTL 電壓 - 電源，單路/雙路(±):2 V ~ 11 V，±1 V ~ 5.5 V 電壓 - 輸入偏移（最小值）:10mV @ 5V 電流 - 輸入偏壓（最小值）:- 電流 - 輸出（標(biāo)準(zhǔn)）:0.015mA @ 5V 電流 - 靜態(tài)（最大值）:8.5µA CMRR, PSRR（標(biāo)準(zhǔn)）:80dB CMRR，80dB PSRR 傳輸延遲（最大）:12µs 磁滯:50mV 工作溫度:0°C ~ 70°C 封裝/外殼:16-DIP（0.300"，7.62mm） 安裝類型:通孔 包裝:管件 |
| LTC1540CMS8PBF | 制造商:Linear Technology 功能描述:Comparator Single +/-5.5V/11V MSOP8 |
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