IC-HC Datasheet, PDF (7/10 Pages) IC-Haus GmbH – ULTRA FAST DUAL HV-KOMPARATOR

iC-HC
ULTRA FAST DUAL HV-KOMPARATOR
preliminary
Hold function with external R/C network
Using external R/C networks at TO and T1 results in
signals as shown in Figure 5. The threshold is set to
2/3 VDD, hence the hold time is calculated using τ to
t_hold = Rext * Cext. The discharging is accomplished
via ca. 25 Ω and hence neglible, since the ext. resistor
(vs. VDD) may not be smaller than 2 kΩ. The hold time
for comparator 0 is set by R0 and C0, whereas R1 and
C1 set the hold time for comparator 1.
VI(x)diff
V(Tx)
VDD
2/ _{3 VDD}
Rev A1, Page 7/10
time
VP 3
R0
T0
4
C0
HYS
R1
T1
HOLD
5
C1
VDD
14
P0
13
P1
12
Figure 4: R/C network connection
GND
time
Hold-
Timer
(int.)
thold
thold
time
VO(x)hold ^{thold = Rext * Cext}
time
Figure 5: Signals at T0 (T1) with ext. R/C network
EVALUATION BOARD
For the iC-HC an Evaluation Board is available for test
purposes. The following figures show the schematic
diagram and the component side of the test PCB.