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MAX9030

Low-Cost, Ultra-Small, Single/Dual/Quad Single-Supply Comparators

Maxim Integrated 

Low-Cost, Ultra-Small, Single/Dual/Quad

Single-Supply Comparators

MAX9030

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MAX9031 MAX9032

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MAX9034

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Pin Description

NAME

IN+

VSS

IN-

OUT

SHDN

VDD

OUTA

INA-

INA+

INB+

INB-

OUTB

OUTC

INC-

INC+

IND+

IND-

OUTD

FUNCTION

Comparator Noninverting Input

Negative Supply Voltage. Bypass with a 0.1µF capacitor.

Comparator Inverting Input

Comparator Output

Shutdown

Positive Supply Voltage. Bypass with a 0.1µF capacitor.

Comparator A Output

Comparator A Inverting Input

Comparator A Noninverting Input

Comparator B Noninverting Input

Comparator B Inverting Input

Comparator B Output

Comparator C Output

Comparator C Inverting Input

Comparator C Noninverting Input

Comparator D Noninverting Input

Comparator D Inverting Input

Comparator D Output

Detailed Description

The MAX9030/MAX9031/MAX9032/MAX9034 are sin-

gle/dual/quad low-cost comparators. They have an

operating supply voltage from +2.5V to +5.5V when

operating from a single supply and from ±1.25V to

±2.75V when operating from dual power supplies, and

consume only 35µA. Their common-mode input voltage

range extends from the negative supply to within 1.1V

of the positive supply. Internal hysteresis ensures clean

output switching, even with slow-moving input signals.

Shutdown Mode

The MAX9030 comparator comes with a power-saving

shutdown mode. When in shutdown, the supply current

drops from a typical 35µA to 0.05µA, and the outputs

become high impedance. SHDN has a high input imped-

ance and typically draws 0.1µA when connected to VSS

or VDD. A maximum logic low voltage of 0.3V  VDD

applied to SHDN places the device in the shutdown

mode. A minimum logic high voltage of 0.7V  VDD

applied to SHDN will enable normal operation. To dis-

able shutdown, connect SHDN to VDD.

Applications Information

Adding Hysteresis

Hysteresis extends the comparator’s noise margin by

increasing the upper threshold and decreasing the

lower threshold. A voltage-divider from the output of the

comparator sets the trip voltage. Therefore, the trip volt-

age is related to the output voltage.

These comparators have 4mV internal hysteresis.

Additional hysteresis can be generated with two resis-

tors using positive feedback (Figure 1). Use the follow-

ing procedure to calculate resistor values:

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