max9120exkt Maxim Integrated Products, Inc., max9120exkt Datasheet - Page 12

• Manufacturer Part Number: max9120exkt
• Description: Sc70, 1.6v, Nanopower, Beyond-the-rails Comparators With/without Reference
• Manufacturer: Maxim Integrated Products, Inc.

SC70, 1.6V, Nanopower, Beyond-the-Rails
Comparators With/Without Reference
Power-supply bypass capacitors are not typically
needed, but use 100nF bypass capacitors close to the
device’s supply pins when supply impedance is high,
supply leads are long, or excessive noise is expected
on the supply lines. Minimize signal trace lengths to
reduce stray capacitance. A ground plane and sur-
face-mount components are recommended. If the REF
pin is decoupled, use a new low-leakage capacitor.
Figure 5 shows a zero-crossing detector application.
The MAX9119’s inverting input is connected to ground,
and its noninverting input is connected to a 100mV
signal source. As the signal at the noninverting input
crosses 0V, the comparator’s output changes state.
The Typical Application Circuit shows an application
that converts 5V logic to 3V logic levels. The MAX9120
is powered by the +5V supply voltage, and the pullup
resistor for the MAX9120’s open-drain output is con-
nected to the +3V supply voltage. This configuration
allows the full 5V logic swing without creating overvolt-
age on the 3V logic inputs. For 3V to 5V logic-level
translations, simply connect the +3V supply voltage to
V
Figure 4. MAX9118/MAX9120 Additional Hysteresis
12
CC
and the +5V supply voltage to the pullup resistor.
______________________________________________________________________________________
V
IN
R1
Board Layout and Bypassing
R2
V
REF
Zero-Crossing Detector
Logic-Level Translator
R3
V
V
V
EE
CC
CC
MAX9118
MAX9120
OUT
R4
P-P
Figure 5. Zero-Crossing Detector
TRANSISTOR COUNT: 98
5V (3V) LOGIC IN
2MΩ
2MΩ
100mV
P-P
Typical Application Circuit
IN-
IN+
IN+
IN-
+5V (+3V)
V
V
CC
EE
Chip Information
MAX9120
V
V
V
LOGIC-LEVEL
TRANSLATOR
CC
CC
EE
MAX9119
OUT
OUT
+3V (+5V)
R
PULLUP
3V (5V)
LOGIC OUT