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参数资料
| 型号： | LT1719IS6 |
| 厂商： | LINEAR TECHNOLOGY CORP |
| 元件分类： | 运动控制电子 |
| 英文描述： | 4.5ns Single/Dual Supply 3V/5V Comparator with Rail-to-Rail Output |
| 中文描述： | COMPARATOR, 3500 uV OFFSET-MAX, 7 ns RESPONSE TIME, PDSO6 |
| 封装： | PLASTIC, SOT-23, 6 PIN |
| 文件页数： | 9/16页 |
| 文件大小： | 234K |
| 代理商： | LT1719IS6 |
9
LT1719
Hysteresis
The LT1719 includes internal hysteresis, which makes it
easier to use than many other similar speed comparators.
The input-output transfer characteristic is illustrated in
Figure 3 showing the definitions of V
OS
and V
HYST
based
upon the two measurable trip points. The hysteresis band
makes the LT1719 well behaved, even with slowly moving
inputs.
APPLICATIO
S I
FOR
ATIO
U
W
U
U
Additional hysteresis may be added externally. The rail-to-
rail outputs of the LT1719 make this more predictable than
with TTL output comparators due to the LT1719’s small
variability of V
OH
(output high voltage).
To add additional hysteresis, set up positive feedback by
adding additional external resistor R3 as shown in Figure
4. Resistor R3 adds a portion of the output to the threshold
set by the resistor string. The LT1719 pulls the outputs to
+V
S
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 voltage on the right
side of R3 is 300mV or +V
S
– 300mV, for a total voltage
swing of (+V
S
– 300mV) – (300mV) = +V
S
– 600mV.
The exact amount of hysteresis will vary from part to part
as indicated in the specifications table. The hysteresis
level will also vary slightly with changes in supply voltage
and common mode voltage. A key advantage of the
LT1719 is the significant reduction in these effects, which
is important whenever an LT1719 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 voltage with an unpredictable level of hysteresis, as
seen in competing comparators, is useless. The LT1719 is
many times better than prior comparators in these re-
gards. In fact, the CMRR and PSRR tests are performed by
checking for changes in either trip point to the limits
indicated in the specifications 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.
Figure 3. Hysteresis I/O Characteristics
V
HYST
(= V
TRIP+
– V
TRIP–
)
V
HYST
/2
V
OL
1719 F03
V
OH
V
TRIP–
V
TRIP+
V
IN
= V
IN+
– V
IN–
V
TRIP+
+ V
TRIP–
2
V
OS
=
V
O
0
–
+
LT1719
INPUT
1719 F04
R2
V
REF
R3
R1
Figure 4. Additional External Hysteresis
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)(+V
S
– 0.6V)/(additional hysteresis)
Additional hysteresis is the desired overall hysteresis less
the internal 4mV hysteresis.
The second step is to recalculate R2 to set the same
average threshold as before. The average threshold before
was set at V
TH
= (V
REF
)(R1)/(R1 + R2). The new R2 is
calculated based on the average output voltage (+V
S
/2)
and the simplified circuit model in Figure 5. To assure that
the comparator’s noninverting input is, on average, the
same V
TH
as before:
R2
′
= (V
REF
– V
TH
)/(V
TH
/R1 + (V
TH
– V
S
/2)/R3)
For additional hysteresis of 10mV or less, it is not uncom-
mon for R2
′
to be the same as R2 within 1% resistor
tolerances.
相关PDF资料 |
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相关代理商/技术参数 |
参数描述 |
|---|---|
| LT1719IS6#PBF | 制造商:Linear Technology 功能描述:Comparator Single R-R O/P 制造商:Linear Technology 功能描述:IC ANALOG COMP 1 4.5ns TSOT-23 制造商:Linear Technology 功能描述:IC, ANALOG COMP, 1, 4.5ns, TSOT-23 制造商:Linear Technology 功能描述:IC, ANALOG COMP, 1, 4.5ns, TSOT-23; Comparator Type:High Speed; No. of Comparators:1; Response Time:4.5ns; Supply Voltage Range:2.7V to 6V; Amplifier Case Style:TSOT-23; No. of Pins:6; IC Output Type:CMOS, TTL; Supply Current:4.6mA ;RoHS Compliant: Yes |
| LT1719IS6#TR | 功能描述:IC COMP R-RINOUT SINGLE SOT23-6 RoHS:否 类别:集成电路 (IC) >> 线性 - 比较器 系列:UltraFast™ 标准包装:25 系列:- 类型:带电压基准 元件数:4 输出类型:CMOS，开路漏极，TTL 电压 - 电源，单路/双路(±):2 V ~ 11 V，±1 V ~ 5.5 V 电压 - 输入偏移（最小值）:10mV @ 5V 电流 - 输入偏压（最小值）:- 电流 - 输出（标准）:0.015mA @ 5V 电流 - 静态（最大值）:8.5µA CMRR, PSRR（标准）:80dB CMRR，80dB PSRR 传输延迟（最大）:12µs 磁滞:50mV 工作温度:0°C ~ 70°C 封装/外壳:16-DIP（0.300"，7.62mm） 安装类型:通孔 包装:管件 |
| LT1719IS6#TRM | 功能描述:IC COMP R-RINOUT SINGLE SOT23-6 RoHS:否 类别:集成电路 (IC) >> 线性 - 比较器 系列:UltraFast™ 标准包装:25 系列:- 类型:带电压基准 元件数:4 输出类型:CMOS，开路漏极，TTL 电压 - 电源，单路/双路(±):2 V ~ 11 V，±1 V ~ 5.5 V 电压 - 输入偏移（最小值）:10mV @ 5V 电流 - 输入偏压（最小值）:- 电流 - 输出（标准）:0.015mA @ 5V 电流 - 静态（最大值）:8.5µA CMRR, PSRR（标准）:80dB CMRR，80dB PSRR 传输延迟（最大）:12µs 磁滞:50mV 工作温度:0°C ~ 70°C 封装/外壳:16-DIP（0.300"，7.62mm） 安装类型:通孔 包装:管件 |
| LT1719IS6#TRMPBF | 功能描述:IC COMP R-RINOUT SINGLE SOT23-6 RoHS:是 类别:集成电路 (IC) >> 线性 - 比较器 系列:UltraFast™ 产品培训模块:Lead (SnPb) Finish for COTS Obsolescence Mitigation Program 标准包装:50 系列:- 类型:带电压基准 元件数:4 输出类型:开路漏极 电压 - 电源，单路/双路(±):2.5 V ~ 11 V，±1.25 V ~ 5.5 V 电压 - 输入偏移（最小值）:10mV @ 5V 电流 - 输入偏压（最小值）:- 电流 - 输出（标准）:0.015mA @ 5V 电流 - 静态（最大值）:8.5µA CMRR, PSRR（标准）:80dB CMRR，80dB PSRR 传输延迟（最大）:- 磁滞:- 工作温度:0°C ~ 70°C 封装/外壳:16-SOIC（0.154"，3.90mm 宽） 安装类型:表面贴装 包装:管件 产品目录页面:1386 (CN2011-ZH PDF) |
| LT1719IS6#TRPBF | 功能描述:IC COMP R-RINOUT SINGLE SOT23-6 RoHS:是 类别:集成电路 (IC) >> 线性 - 比较器 系列:UltraFast™ 标准包装:25 系列:- 类型:带电压基准 元件数:4 输出类型:CMOS，开路漏极，TTL 电压 - 电源，单路/双路(±):2 V ~ 11 V，±1 V ~ 5.5 V 电压 - 输入偏移（最小值）:10mV @ 5V 电流 - 输入偏压（最小值）:- 电流 - 输出（标准）:0.015mA @ 5V 电流 - 静态（最大值）:8.5µA CMRR, PSRR（标准）:80dB CMRR，80dB PSRR 传输延迟（最大）:12µs 磁滞:50mV 工作温度:0°C ~ 70°C 封装/外壳:16-DIP（0.300"，7.62mm） 安装类型:通孔 包装:管件 |
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