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參數資料
| 型號： | LTC1445IS |
| 廠商： | LINEAR TECHNOLOGY CORP |
| 元件分類： | 運動控制電子 |
| 英文描述： | Low-Power LinCMOS(TM) Dual Comparator with Totem Pose Output 8-SOIC -55 to 125 |
| 中文描述： | QUAD COMPARATOR, 10000 uV OFFSET-MAX, 14000 ns RESPONSE TIME, PDSO16 |
| 封裝： | 0.150 INCH, PLASTIC, SOP-16 |
| 文件頁數： | 7/12頁 |
| 文件大?。?/td> | 176K |
| 代理商： | LTC1445IS |
7
LTC1443/LTC1444/LTC1445
OUT D (Pin 15):
Comparator D Output. (Open-drain
output for LTC1444). Output can source up to 40mA
(LTC1443, LTC1445) and sink 5mA.
OUT C (Pin 16):
Comparator C Output. (Open-drain output
for LTC1444). Output can source up to 40mA (LTC1443,
LTC1445) and sink 5mA.
The LTC1443/LTC1444/LTC1445 is a family of quad
micropower comparators with a built-in reference (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
ability of the reference to drive up to a 0.01
μ
F capacitor
without 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 0.1
μ
F
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 during transi-
tions 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 200
μ
A and sink up to 15
μ
A with a 5V
supply. The reference can drive a bypass capacitor of up to
0.01
μ
F without oscillation and by inserting a series resistor,
capacitance values up to 100
μ
F can be used (Figure 1).
Figure 2 shows the resistor value required for different
capacitor values to achieve critical damping.
CAPACITOR VALUE (
μ
F)
0.001
0.1
R
)
10
1000
0.01
0.1
10
1
LTC1443/44/45 F02
1
100
Figure 2. Damping Resistance vs Bypass Capacitor Value
LTC144X
V
–
REF
R1
C1
REFERENCE
OUTPUT
LTC1443/44/45 F01
Figure 1. Damping the Reference Output
PIU
APPLICATIOU
W
U
U
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