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參數(shù)資料
| 型號(hào)： | LTC1843CS8#TR |
| 廠商： | Linear Technology |
| 文件頁(yè)數(shù)： | 10/12頁(yè) |
| 文件大?。?/td> | 0K |
| 描述： | IC COMPARATOR DUAL ULT LP 8SOIC |
| 標(biāo)準(zhǔn)包裝： | 2,500 |
| 類型： | 帶電壓基準(zhǔn) |
| 元件數(shù)： | 2 |
| 輸出類型： | 開路漏極 |
| 電壓 - 電源，單路/雙路(±)： | 2.5 V ~ 11 V，±1.25 V ~ 5.5 V |
| 電壓 - 輸入偏移（最小值）： | 10mV @ 5V |
| 電流 - 靜態(tài)（最大值）： | 5.7µA |
| CMRR, PSRR（標(biāo)準(zhǔn)）： | 80dB CMRR，80dB PSRR |
| 傳輸延遲（最大）： | 12µs |
| 磁滯： | 50mV |
| 工作溫度： | 0°C ~ 70°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) |
7
LTC1841/LTC1842/LTC1843
APPLICATIONS INFORMATION
WU
U
The LTC1841/LTC1842/LTC1843 are dual micropower
comparators with a built-in 1.182V reference (LTC1842/
LTC1843). Features include programmable hysteresis,
wide supply voltage range (2V to 11V) and the ability for
the reference to drive up to a 0.01
F capacitor without
oscillation. The comparators’ open-drain outputs can typi-
cally sink greater than 20mA and the supply current
glitches that normally occur when switching logic states
have been eliminated.
Power Supplies
The comparators operate from a single 2V to 11V (2.5V to
11V for LTC1842/LTC1843) or dual
±1V to ±5.5V supply
(
±1.25V to ±5.5V for LTC1842/LTC1843). If the reference
output is required to source more than 1mA or the supply
source impedance is high, V + should be bypassed with a
0.1
F capacitor.
Comparator Inputs
The comparators’ input can swing from the negative
supply V – to within 1.3V (max) of the positive supply V +.
The input can be forced 300mV below V – or above V +
without damage and the typical input leakage current is
only
±10pA.
Comparator Outputs
Each comparator output is an open-drain pull-down to V–
typically capable of sinking greater than 20mA. The low
output leakage current while in three-state mode allows a
high value pull-up resistor to be used. The open-drain
outputs can be wire OR-ed or used in level shifting
applications.
Voltage Reference
The internal bandgap reference has an output voltage of
1.182V referenced to V –. The reference accuracy is 1.5%
from – 40
°C to 85°C. It can typically source greater than
1mA and sink up to 10
A with a 5V supply. The reference
can drive a bypass capacitor of up to 0.01
F without
oscillation. By inserting a series resistor, capacitance
values up to 100
F can be used (Figure 1).
Figure 1. Damping the Reference Output
Figure 3 shows the bypassed reference output with a
square wave applied to the V + pin. Resistors R2 and R3 set
a 10mV hysteresis voltage band while R1 damps the
reference response. Note that the comparator output
doesn’t trip.
CAPACITOR VALUE (
F)
0.001
0.1
RESISTOR
VALUE
(k
)
10
0.01
0.1
10
1
1841/43 F02
1
100
Figure 2. Damping Resistance vs Bypass Capacitor Value
LTC1843
V –
REF
R1
C1
REFERENCE
OUTPUT
1841/43 F01
Figure 2 shows the resistor value required for different
capacitor values to achieve critical damping. Bypassing
the reference can help prevent false tripping of the com-
parators by preventing glitches on V + or reference load
transients from disturbing the reference output voltage.
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