MAX9075 Maxim, MAX9075 Datasheet - Page 7

• Manufacturer Part Number: MAX9075
• Description: The MAX9075/MAX9077 single/dual comparators are optimized for 3V and 5V single-supply applications
• Manufacturer: Maxim

4) Choose the threshold voltage for V
5) Calculate R2 as follows:
1 / {[3 / (1.2
6) Verify the threshold voltages with these formulas:
7) Check the error due to input bias current (5nA). If the
Use 10nF power-supply bypass capacitors. Use 100nF
bypass capacitors when supply impedance is high,
when supply leads are long, or when excessive noise is
expected on the supply lines. Minimize signal trace
lengths to reduce stray capacitance. Minimize the
capacitive coupling between IN- and OUT. For slow-
moving input signals (rise time > 1ms) use a 1nF
capacitor between IN+ and IN-.
MAX9075 TRANSISTOR COUNT: 86
MAX9077 TRANSISTOR COUNT: 142
this example, choose V
A 1% preferred value is 64.9kΩ.
V
V
error is too large, reduce R3 and recalculate.
V
IN
IN
TH
R2 = 1 / {[V
rising:
falling:
= I
V
THR
B
(R1
✕
V
= V
100kΩ)] - 1/100kΩ - 1/10MΩ} = 67.114kΩ
THF
✕
THR
REF
R2
= V
_______________________________________________________________________________________
Board Layout and Bypassing
/ (V
✕
✕
THR
R3) / (R1 + R2 + R3) = 0.2mV
R1 (1/R1 + 1/R2 + 1/R3)
REF
THR
- (R1
✕
Chip Information
= 3V.
R1)] - 1/R1 - 1/R3} =
✕
V
CC
IN
) / R3
rising (V
THR
Single-Supply Comparators
Low-Cost, Ultra-Small, 3µA
). In
Figure 1. Adding Hysteresis
TOP VIEW
V
Pin Configurations (continued)
IN
R1
R2
OUTA
OUTA
INA+
INA+
GND
GND
INA-
INA-
1
2
4
1
2
4
3
3
V
REF
µMAX/SO
SOT23-8
MAX9077
MAX9077
GND
V
V
CC
CC
6
6
8
7
5
8
7
5
MAX9075
MAX9077
R3
V
OUTB
INB-
INB+
V
OUTB
INB-
INB+
OUT
CC
CC
7