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參數(shù)資料
| 型號： | LT1011IS8#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 20/20頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC VOLTAGE COMPARATOR 5V 8-SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 通用 |
| 元件數(shù)： | 1 |
| 輸出類型： | 開路集電極 |
| 電壓 - 電源，單路/雙路(±)： | 3 V ~ 36 V，±1.5 V ~ 18 V |
| 電壓 - 輸入偏移（最小值）： | 2mV @ ±15V |
| 電流 - 輸入偏壓（最小值）： | 0.065µA @ ±15V |
| 電流 - 輸出（標(biāo)準(zhǔn)）： | 50mA |
| 電流 - 靜態(tài)（最大值）： | 4mA |
| CMRR, PSRR（標(biāo)準(zhǔn)）： | 115dB CMRR |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 8-SOIC（0.154"，3.90mm 寬） |
| 安裝類型： | 表面貼裝 |
| 包裝： | 帶卷 (TR) |
LT1011/LT1011A
9
1011afe
For more information www.linear.com/LT1011
applicaTions inForMaTion
Figure 2. Input Offset Voltage vs Time to Last Transition
Figure 3. Limiting Fault Input Currents
This circuit is especially useful for general purpose
comparator applications because it does not force
any signals directly back onto the input signal source.
Instead, it takes advantage of the unique properties
of the BALANCE pins to provide extremely fast, clean
output switching even with low frequency input signals
in the millivolt range. The 0.003F capacitor from Pin
6 to Pin 8 generates AC hysteresis because the voltage
on the BALANCE pins shifts slightly, depending on the
state of the output. Both pins move about 4mV. If one
pin (6) is bypassed, AC hysteresis is created. It is only
a few millivolts referred to the inputs, but is sufficient
to switch the output at nearly the maximum speed of
which the comparator is capable. To prevent problems
fromlowvaluesofinputslewrate,aslightamountofDC
hysteresis is also used. The sensitivity of the BALANCE
pins to current is about 0.5mV input referred offset for
each microampere of BALANCE pin current. The 15M
resistor tied from OUTPUT to Pin 5 generates 0.5mV DC
hysteresis. The combination of AC and DC hysteresis
creates clean oscillation-free switching with very small
input errors. Figure 2 plots input referred error versus
switching frequency for the circuit as shown.
Note that at low frequencies, the error is simply the
DC hysteresis, while at high frequencies, an addi-
tional error is created by the AC hysteresis. The high
frequency error can be reduced by reducing CH, but
lower values may not provide clean switching with very
low slew rate input signals.
Input Protection
The inputs to the LT1011 are particularly suited to general
purposecomparatorapplicationsbecauselargedifferential
and/or common mode voltages can be tolerated without
damage to the comparator. Either or both inputs can be
raised 40V above the negative supply, independent of the
positive supply voltage. Internal forward biased diodes
will conduct when the inputs are taken below the negative
supply. In this condition, input current must be limited to
1mA. If very large (fault) input voltages must be accom-
modated, series resistors and clamp diodes should be
used (see Figure 3).
TIME/FREQUENCY (s)
1
2
INPUT
OFFSET
VOLTAGE
(mV)
3
4
5
6
10
100
1000
1011 F02
1
0
–1
–2
7
8
C8 TO C6 = 0.003F
(50kHz)
(5kHz)
OUTPUT “HI” TO “LO”
OUTPUT “LO” TO “HI”
–
+
LT1011
R4*
300
R3*
300
3
2
INPUTS
D1 TO D4: 1N4148
MAY BE ELIMINATED FOR IFAULT ≤ 1mA
SELECT ACCORDING TO ALLOWABLE
FAULT CURRENT AND POWER DISSIPATION
*
**
R1**
V+
V–
R2**
8
D2
4
1011 F03
D4
D1
D3
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