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參數(shù)資料
| 型號(hào)： | LT6700-1 |
| 廠商： | Linear Technology Corporation |
| 英文描述： | Micropower, Low Voltage, SOT-23, Dual Comparator with 400mV Reference |
| 中文描述： | 微功耗，低電壓，采用SOT - 23，雙400mV的參考與比較 |
| 文件頁數(shù)： | 10/12頁 |
| 文件大小： | 237K |
| 代理商： | LT6700-1 |
LT6700-1/LT6700-2/LT6700-3
10
6700123fb
To create window functions optimized for detecting entry
into a window (i.e. where the output is to indicate a
“coming into spec” condition, as with the examples in
Figure 1), the nominal resistor values are selected as
follows:
R1
≤
400k (this sets the divider current >> I
B
of inputs)
R2 = R1 (1.02 V
H
/V
L
– 1)
R3 = R1 (2.54 V
H
– 1.02 V
H
/V
L
)
The worst-case variance of the trip-points is related to the
specified threshold limits of the LT6700 device and the
basic tolerance of divider resistors used. For resistor
tolerance R
TOL
(e.g. 0.01 for 1%), the worst-case trip-
point voltage (either V
H
or V
L
) deviations can be predicted
as follows (italicized values are taken from the datasheet,
expressed in volts):
Max dev V
TRIP
↑
=
±
V
TRIPnom
{2 R
TOL
[(V
TRIPnom
– 0.4)
/ V
TRIPnom
] + 1.25 (V
TH(R)max
– V
TH(R)min
)}
Max dev V
TRIP
↓
=
±
V
TRIPnom
{2 R
TOL
[(V
TRIPnom
– 0.39)
/ V
TRIPnom
] + 1.27 (V
TH(F)max
– V
TH(F)min
)}
Generating an External Reference Signal
In some applications, it would be advantageous to have
access to a signal that is directly related to the internal
400mV reference, even though the reference itself is not
available externally. This can be accomplished to a reason-
able degree by using an inverting comparator section as a
“bang-bang” servo, establishing a nominal voltage, on an
integration capacitor, that is scaled to the reference. This
method is used in Figure 2, where the reference level has
APPLICATIU
W
U
U
Figure 1. Simple Window Comparator
been doubled to drive a resistor bridge. The section B
output cycles on and off to swing the section B input
between its hysteresis trip points as the load capacitor
charges and discharges in a shallow, controlled fashion.
The multiplied reference signal also contains ripple that is
the hysteresis multiplied by the same factor, so additional
filtering is performed at the sense node of the bridge to
prevent comparator chatter in the section A comparator,
which is performing the actual conditional decision for the
circuit.
Instrumentation Grade Pulse Width Modulator (PWM)
Comparators with hysteresis are frequently employed to
make simple oscillator structures, and the LT6700 lends
itself nicely to forming a charge-balancing PWM function.
The circuit shown in Figure 3 forms a PWM that is intended
to transmit an isolated representation of a voltage differ-
LT6700-1
V
S
GND
1
5
R3
301k
R2
6.04k
33k
+INA
–INB OUTB
OUTA
V
OUT
V
S
V
L
V
H
3.3V
3.3V Supply Monitor
5V Supply Monitor
R1
40.2k
2
6
0.1
μ
F
V
HIGH = (3.1V < V
S
< 3.5V)
HYSTERESIS ZONES
APPROXIMATELY
2% OF TRIP VOLTAGE
3
4
LT6700-1
V
S
GND
1
5
487k
6.04k
33k
+INA
–INB OUTB
OUTA
5V
40.2k
2
6
0.1
μ
F
V
HIGH = (4.7V < V
S
< 5.3V)
3
4
6700123 F01
LT6700-1
V
S
10k
GND
1
5
+INA
–INB OUTB
OUTA
2
6
3
4
499k
R
TH
T
R
TH
= 1M (e.g., YSI 44015, 1.00M
AT 25
°
C)
R
SET
= R
TH
AT T
SET
*RESISTANCE MAY REQUIRE OPTIMIZATION FOR OPERATION
OVER INTENDED R
TH
AND V
SUPPLY
RANGES
HYSTERESIS ZONE
≈
0.4
°
C
R
SET
2 V
REF
499k
220k
220k*
T < T
SET
3.3
μ
F
3.3
μ
F
1.4V TO 18V
(I
S
≈
10
μ
A)
0.1
μ
F
6700123 F02
Figure 2. Micropower Thermostat/Temperature Alarm
相關(guān)PDF資料 |
PDF描述 |
|---|---|
| LT6700-2 | Micropower, Low Voltage, SOT-23, Dual Comparator with 400mV Reference |
| LT6700-3 | LCD 4.5 DIGIT .4 TRANSFL |
| LTAEY | Differential Input 16-Bit No Latency DS ADC |
| LTAEZ | Differential Input 16-Bit No Latency DS ADC |
| LTC2433-1 | Differential Input 16-Bit No Latency DS ADC |
相關(guān)代理商/技術(shù)參數(shù) |
參數(shù)描述 |
|---|---|
| LT6700-1_09 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower, Low Voltage, Dual Comparator with 400mV Reference |
| LT6700-2 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower, Low Voltage, SOT-23, Dual Comparator with 400mV Reference |
| LT6700-3 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Ultralow Power Single/Dual Comparator with Reference |
| LT6700CDCB-1 | 制造商:LINER 制造商全稱:Linear Technology 功能描述:Micropower, Low Voltage, Dual Comparator with 400mV Reference |
| LT6700CDCB-1#PBF | 制造商:Linear Technology 功能描述:Comparator Dual 18V 6-Pin DFN EP |
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