MAX9075EUK-T(1999) データシートの表示（PDF） - Maxim Integrated
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MAX9075EUK-T Datasheet PDF : 8 Pages
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Low-Cost, Ultra-Small, 3µA
Single-Supply Comparators
4) Choose the threshold voltage for VIN rising (VTHR). In
this example, choose VTHR = 3V.
5) Calculate R2 as follows:
R2 = 1 / {[VTHR / (VREF · R1)] - 1/R1 - 1/R3} =
1 / {[3 / (1.2 · 100k)] - 1/100k - 1/10M} = 67.114kΩ
A 1% preferred value is 64.9kΩ.
6) Verify the threshold voltages with these formulas:
VIN rising:
VTHR = VREF · R1 (1/R1 + 1/R2 + 1/R3)
VIN falling:
VTHF = VTHR - (R1 · VCC) / R3
7) Check the error due to input bias current (5nA). If the
error is too large, reduce R3 and recalculate.
VTH = IB (R1 · R2 · R3) / (R1 + R2 + R3) = 0.2mV
Board Layout and Bypassing
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-.
Chip Information
TRANSISTOR COUNT: 86 (MAX9075)
142 (MAX9077)
R1
VIN
R2
VREF
VCC
R3
VCC
OUT
GND
MAX9075
MAX9077
Figure 1. Adding Hysteresis
Pin Configurations (cont.)
TOP VIEW
OUTA 1
GND 2
INA- 3
INA+ 4
MAX9077
8 VCC
7 OUTB
6 INB-
5 INB+
SOT23-8
OUTA 1
INA- 2
INA+ 3
GND 4
MAX9077
8 VCC
7 OUTB
6 INB-
5 INB+
SO
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