High-Speed, Low-Power Voltage Comparators
MAX900–MAX903
OUTPUT
1V/div
OUTPUT
1V/div
INPUT
10mV/div
5ns/div
INPUT
10mV/div
5ns/div
Figure 6. Response to 50MHz Sine Wave
Figure 7. Response to 100MHz Sine Wave Photo
+1.25V
VREF
IN1
Typical Application
UNDER
LIMIT
MX7228
VDAC1
OCTAL
8-BIT
DAC
V
OUT1
Programmed, Variable-Alarm Limits
By combining two quad analog comparators with an
octal 8-bit D/A converter (the MX7228), several alarm
and limit-defect functions can be performed simultane-
ously without external adjustments
The MX7228’s internal latches allow the system
processor to set the limit points for each comparator
independently and update them at any time. Set the
upper and lower thresholds for a single transducer by
pairing the D/A converter and comparator sections.
OVER
LIMIT
IN2
IN3
UNDER
LIMIT
IN4
UNDER
LIMIT
MSB
D7
8-BIT
DATA
INPUT
LSB
D1
IN6
8x8
DATA
LATCH
IN5
MAX901
UNDER
LIMIT
UNDER
LIMIT
OVER
LIMIT
IN7
A0
A1
A2
IN8
MAX901
CONTROL
LOGIC
VDAC8
V
OUT8
OVER
LIMIT
Figure 8. Alarm Circuit Level Monitors Eight Separate Inputs
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11
MAXIM [ MAXIM INTEGRATED PRODUCTS ]
