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參數(shù)資料
| 型號： | LT1715CMS#TR |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 4/20頁 |
| 文件大小： | 0K |
| 描述： | IC COMPARATOR 150MHZ DUAL 10MSOP |
| 標準包裝： | 2,500 |
| 系列： | UltraFast™ |
| 類型： | 通用 |
| 元件數(shù)： | 2 |
| 輸出類型： | CMOS，滿擺幅，TTL |
| 電壓 - 電源，單路/雙路(±)： | 2.7 V ~ 12 V |
| 電壓 - 輸入偏移（最小值）： | 2.5mV @ ±5V |
| 電流 - 輸入偏壓（最小值）： | 6µA @ ±5V |
| 電流 - 輸出（標準）： | 20mA |
| 電流 - 靜態(tài)（最大值）： | 2mA |
| CMRR, PSRR（標準）： | 70dB CMRR，80dB PSRR |
| 傳輸延遲（最大）： | 9ns |
| 磁滯： | 6mV |
| 工作溫度： | 0°C ~ 70°C |
| 封裝/外殼： | 10-TFSOP，10-MSOP（0.118"，3.00mm 寬） |
| 安裝類型： | 表面貼裝 |
| 包裝： | 帶卷 (TR) |
| 其它名稱： | LT1715CMSTR |
LT1715
12
1715fa
Figure 6. Additional External Hysteresis
–
+
1/2 LT1715
INPUT
1715 F06
R2
VREF
R3
R1
APPLICATIONS INFORMATION
Unused Comparators
If a comparator is unused, its output should be left oa-
tingto minimize load current. The unused inputs can be
tied off to the rails and power consumption can be further
minimized if the inputs are connected to the power rails
to induce an output low. Connecting the inverting input
to VCC and the noninverting input to VEE will likely be the
easiest method.
Hysteresis
The LT1715 includes internal hysteresis, which makes it
easier to use than many other similar speed comparators.
The input-output transfer characteristic is illustrated in
Figure 5 showing the denitions of VOS and VHYST based
upon the two measurable trip points. The hysteresis band
makes the LT1715 well behaved, even with slowly moving
inputs.
The exact amount of hysteresis will vary from part to part
as indicated in the specications table. The hysteresis level
will also vary slightly with changes in supply voltage and
common mode voltage. A key advantage of the LT1715
is the signicant reduction in these effects, which is im-
portant whenever an LT1715 is used to detect a threshold
crossing in one direction only. In such a case, the relevant
trip point will be all that matters, and a stable offset volt-
age with an unpredictable level of hysteresis, as seen in
competing comparators, is useless. The LT1715 is many
times better than prior generation comparators in these
regards. In fact, the CMRR and PSRR tests are performed
by checking for changes in either trip point to the limits
indicated in the specications table. Because the offset
voltage is the average of the trip points, the CMRR and
PSRR of the offset voltage is therefore guaranteed to be
at least as good as those limits. This more stringent test
also puts a limit on the common mode and power supply
dependence of the hysteresis voltage.
Additional hysteresis may be added externally. The rail-
to-rail outputs of the LT1715 make this more predictable
than with TTL output comparators due to the LT1715’s
small variability of VOH (output high voltage).
To add additional hysteresis, set up positive feedback
by adding additional external resistor R3 as shown in
Figure 6. Resistor R3 adds a portion of the output to the
threshold set by the resistor string. The LT1715 pulls the
outputs to +VS and ground to within 200mV of the rails
with light loads, and to within 400mV with heavy loads.
For the load of most circuits, a good model for the volt-
age on the right side of R3 is 300mV or +VS – 300mV,
for a total voltage swing of (+VS – 300mV) – (300mV) =
+VS – 600mV.
With this in mind, calculation of the resistor values needed
is a two-step process. First, calculate the value of R3 based
on the additional hysteresis desired, the output voltage
swing and the impedance of the primary bias string:
R3 = (R1||R2)(+VS – 0.6V)/(additional hysteresis)
Additional hysteresis is the desired overall hysteresis less
the internal 4mV hysteresis.
Figure 5. Hysteresis I/O Characteristics
VHYST
(= VTRIP
+ – VTRIP–)
VHYST/2
VOL
1715 F05
VOH
VTRIP
–
VTRIP
+
ΔVIN = VIN
+ – VIN–
VTRIP
+ + VTRIP–
2
VOS =
V
OUT
0
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相關代理商/技術參數(shù) |
參數(shù)描述 |
|---|---|
| LT1715CMSTRPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:4ns, 150MHz Dual Comparator with Independent Input/Output Supplies |
| LT1715HMS#PBF | 功能描述:IC COMP DUAL 150MHZ 4NS 10-MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:UltraFast™ 標準包裝:1 系列:- 類型:通用 元件數(shù):1 輸出類型:CMOS，開路集電極，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（標準）:84mA @ 5V 電流 - 靜態(tài)（最大值）:120µA CMRR, PSRR（標準）:- 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)品目錄頁面:1268 (CN2011-ZH PDF) 其它名稱:*LMV331M5*LMV331M5/NOPBLMV331M5CT |
| LT1715HMS#PBF | 制造商:Linear Technology 功能描述:IC, HIGH SPEED COMP, DUAL, 4NS, MSOP-10 |
| LT1715HMS#TRPBF | 功能描述:IC COMPARATOR 4NS DUAL 10-MSOP RoHS:是 類別:集成電路 (IC) >> 線性 - 比較器 系列:UltraFast™ 產(chǎn)品培訓模塊:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 標準包裝:2,500 系列:- 類型:通用 元件數(shù):1 輸出類型:CMOS，推挽式，滿擺幅，TTL 電壓 - 電源，單路/雙路(±):2.5 V ~ 5.5 V，±1.25 V ~ 2.75 V 電壓 - 輸入偏移（最小值）:5mV @ 5.5V 電流 - 輸入偏壓（最小值）:1pA @ 5.5V 電流 - 輸出（標準）:- 電流 - 靜態(tài)（最大值）:24µA CMRR, PSRR（標準）:80dB CMRR，80dB PSRR 傳輸延遲（最大）:450ns 磁滯:±3mV 工作溫度:-40°C ~ 85°C 封裝/外殼:6-WFBGA，CSPBGA 安裝類型:表面貼裝 包裝:管件 其它名稱:Q3554586 |
| LT1715HMSPBF | 制造商:LINER 制造商全稱:Linear Technology 功能描述:4ns, 150MHz Dual Comparator with Independent Input/Output Supplies |
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