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參數(shù)資料
| 型號： | LTC1445IS#TRPBF |
| 廠商： | Linear Technology |
| 文件頁數(shù)： | 13/14頁 |
| 文件大?。?/td> | 0K |
| 描述： | IC COMP W/REF LOWPWR QUAD 16SOIC |
| 標準包裝： | 2,500 |
| 類型： | 帶電壓基準 |
| 元件數(shù)： | 4 |
| 輸出類型： | CMOS，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 - 輸出（標準）： | 0.015mA @ 5V |
| 電流 - 靜態(tài)（最大值）： | 8.5µA |
| CMRR, PSRR（標準）： | 80dB CMRR，80dB PSRR |
| 傳輸延遲（最大）： | 12µs |
| 磁滯： | 50mV |
| 工作溫度： | -40°C ~ 85°C |
| 封裝/外殼： | 16-SOIC（0.154"，3.90mm 寬） |
| 安裝類型： | 表面貼裝 |
| 包裝： | 帶卷 (TR) |
LTC1443/LTC1444/LTC1445
8
144345fe
applicaTions inForMaTion
The LTC1443/LTC1444/LTC1445 is a family of quad
micropowercomparatorswithabuilt-inreference(1.182V
for the LTC1443 and 1.221V for the LTC1444/LTC1445).
Features include programmable hysteresis (LTC1444/
LTC1445), wide supply voltage range (2V to 11V) and the
abilityofthereferencetodriveuptoa0.01Fcapacitorwith-
out oscillation. The comparator CMOS outputs (LTC1443/
LTC1445) can source up to 40mA while the LTC1444 has
an open-drain output to V–. The supply current glitches
that normally occur when the comparator output switches
states have been eliminated.
Power Supplies
The comparator family operates from a single 2V to 11V
supply. The LTC1443 includes a separate ground for the
comparator output stage, allowing a split supply ranging
from ±1V to ±5.5V. Connecting V– to GND on the LTC1443
allows single supply operation. If the comparator output
is required to source more than 1mA or the supply source
impedance is high, V+ should be bypassed with a 0.1F
capacitor.
Comparator Inputs
The comparator inputs can swing from the negative sup-
ply (V–) to within 1.3V maximum of the positive supply
(V+). The inputs can be forced 300mV below V– or above
V+ without damage, and the typical input leakage current
is only ±10pA.
Comparator Outputs
The LTC1443 comparator output swings between GND
and V+ to assure TTL compatibility with a split supply.
The LTC1444 and LTC1445 outputs swing between V–
and V+. The outputs are capable of sourcing up to 40mA
(LTC1443/LTC1445) and sinking up to 5mA while still
maintaining microampere quiescent currents. The output
stage does not generate crowbar switching currents dur-
ing transitions which helps minimize parasitic feedback
through the supply pins.
Voltage Reference
The internal bandgap reference has a voltage of 1.182V for
LTC1443 or 1.221V for LTC1444/LTC1445 referenced to
V–. The reference accuracy is 1.5% from –40°C to 85°C.
It can source up to 200A and sink up to 15A with a 5V
supply. The reference can drive a bypass capacitor of up to
0.01Fwithoutoscillationandbyinsertingaseriesresistor,
capacitance values up to 100F can be used (Figure 1).
Figure 2 shows the resistor value required for different
capacitor values to achieve critical damping.
CAPACITOR VALUE (F)
0.001
0.1
RESISTOR
VALUE
(k
)
10
1000
0.01
0.1
10
1
144345 F02
1
100
Figure 2. Damping Resistance vs Bypass Capacitor Value
LTC144X
V–
REF
R1
C1
REFERENCE
OUTPUT
144345 F01
1.2V
+–
Figure 1. Damping the Reference Output
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