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LTC6752-4 Datasheet(PDF) 19 Page - Analog Devices

Part # LTC6752-4
Description  Comparator Family with Rail-to-Rail Inputs
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Manufacturer  AD [Analog Devices]
Direct Link  http://www.analog.com
Logo AD - Analog Devices

LTC6752-4 Datasheet(HTML) 19 Page - Analog Devices

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LTC6752/LTC6752-1/
LTC6752-2/LTC6752-3/
LTC6752-4
19
6752fc
For more information www.linear.com/LTC6752
applicaTions inForMaTion
Conversely, when processing small or fast differential sig-
nals, hysteresis may need to be eliminated. The LTC6752-1/
LTC6752-2/LTC6752-3 provide a hysteresis pin, LE/
HYST, that can be used to increase the internal hysteresis,
completely remove it, or enable the output to latch. For
these 3 options of the LTC6752, the internal hysteresis
is disabled when the LE/HYST pin voltage is above 1.7V.
Although eliminating hysteresis does reduce the voltage
gain of the comparator to a finite value, in many cases it
will be high enough (typically 6000V/V) to process small
input signals. The output will latch when the LE/HYST pin
voltage is below 0.3V. The internal hysteresis will increase
as the voltage of the pin is adjusted from its default open
circuit value of 1.25V to 800mV.
The LE/HYST pin can be modeled as a 1.25V voltage
source in series with a 20k resistor. The simplest method
to increase the internal hysteresis is to connect a single
resistorasshowninFigure4betweentheLE/HYSTpinand
VEE to adjust hysteresis. Figure 5 shows how hysteresis
typically varies with the value of the resistor.
In addition to adjusting hysteresis using the LE/HYST
pin, additional hysteresis can be added using positive
feedback from the output back to the positive input, as
shown in Figure 6.
The offset (with respect to the input signal) and hysteresis
become
VOS_FB =
VDD +VEE
(
)
2
R1
R1
+R2
+VREF
R2
R1
+R2
−VOS
VOH
2
R1
R1
+R2
+VOL
R2
R1
+R2
 →
 (1)
VHYST_FB = VDD −VEE
(
)
R1
R1
+R2
+VOL
R2
R1
+R2
+
VOH
R1
R1
+R2
+VHYST  →
 (2)
VOS_FB and VHYST_FB denote the values of offset and
hysteresis with positive feedback present. VHYST denotes
the hysteresis of the device without positive feedback.
For light loads, VOH (output swing high) and VOL (output
swing low) are typically a few mV (typically are less than
10mV for a 500µA load).
On a 3.0V total supply with VEE = 0V, an increase in
hysteresis of approximately 300mV can be obtained with
VREF = 1.25V, R2 = 4.53kΩ , R1 = 511Ω, with an induced
offset of approximately 1.275V.
Figure 4. Adjusting Hysteresis Using an External
Resistor at the LE/HYST Pin
Figure 5. Hysteresis vs Control Resistor
Figure 6. Additional Hysteresis Using Positive Feedback
6752 F04
+
VCC
VDD
Q
VEE
LE/HYST
R
–IN
+IN
6752 F06
+
VCC
VREF
SIGNAL
VDD
Q
VEE
R2
R1
50
CONTROL RESISTANCE (k)
30
230
430
130
330
6752 F05
480
180
380
80
280
0
5
10
15
20
25
30
35
40
45
VCC = VDD = 2.5V
VCM = 0.3V
TA = 25°C
CONTROL RESISTOR CONNECTED
BETWEEN LE/HYST PIN AND VEE


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