參數(shù)資料
型號(hào): LTC1443CS#TR
廠(chǎng)商: Linear Technology
文件頁(yè)數(shù): 13/14頁(yè)
文件大?。?/td> 0K
描述: IC COMP QUAD LP 1.182VREF 16SOIC
標(biāo)準(zhǔn)包裝: 2,500
類(lèi)型: 帶電壓基準(zhǔn)
元件數(shù): 4
輸出類(lèi)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(biāo)準(zhǔn)): 0.015mA @ 5V
電流 - 靜態(tài)(最大值): 8.5µA
CMRR, PSRR(標(biāo)準(zhǔn)): 80dB CMRR,80dB PSRR
傳輸延遲(最大): 12µs
工作溫度: 0°C ~ 70°C
封裝/外殼: 16-SOIC(0.154",3.90mm 寬)
安裝類(lèi)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 Vto 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 Vor 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
0.1
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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